cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
False signals of chaos from quantum probes
Creators: name: Kirkby, W.
name: O'Dell, D. H. J.
name: Mumford, J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We demonstrate that two-time correlation functions, which are generalizations of out-of-time-ordered correlators (OTOCs), can show 'false-flags' of chaos by exhibiting behaviour predicted by random matrix theory even in a system with classically regular dynamics. In particular, we analyze a system of bosons trapped in a double-well potential and probed by a quantum dot which is coupled to the bosons dispersively. This is an integrable system (considered both as separate parts and in total). Despite the continuous time evolution generated by the actual Hamiltonian, we find that the n-fold two-time correlation function for the probe describes an effective stroboscopic or Floquet dynamics whereby the bosons appear to be alternately driven by two different non-commuting Hamiltonians in a manner reminiscent of the Trotterized time evolution that occurs in digital quantum simulation. The classical limit of this effective dynamics can have a nonzero Lyapunov exponent, while the effective level statistics and return probability show traditional signatures of chaotic behaviour. In line with several other recent studies, this work highlights the fact that the behavior of OTOCs and their generalizations must be interpreted with some care.
description: 14 pages, 7 figures
Conway Normal Form: Bridging Approaches for Comprehensive Formalization of Surreal Numbers
Creators: name: Pąk, Karol
name: Kaliszyk, Cezary
Publisher: name: arXiv
Year: 2024
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: The proper class of Conway's surreal numbers forms a rich totally ordered algebraically closed field with many arithmetic and algebraic properties close to those of real numbers, the ordinals, and infinitesimal numbers. In this paper, we formalize the construction of Conway's numbers in Mizar using two approaches and propose a bridge between them, aiming to combine their advantages for efficient formalization. By replacing transfinite induction-recursion with transfinite induction, we streamline their construction. Additionally, we introduce a method to merge proofs from both approaches using global choice, facilitating formal proof. We demonstrate that surreal numbers form a field, including the square root, and that they encompass subsets such as reals, ordinals, and powers of $ω$. We combined Conway's work with Ehrlich's generalization to formally prove Conway's Normal Form, paving the way for many formal developments in surreal number theory.
description: Published at ITP 2024
Outliers from the mainstream: how a massive star can produce a gamma-ray burst
Creators: name: Campana, S.
name: Panagia, N.
name: Lazzati, D.
name: Beardmore, A. P.
name: Cusumano, G.
name: Godet, O.
name: Chincarini, G.
name: Covino, S.
name: Della Valle, M.
name: Guidorzi, C.
name: Malesani, D.
name: Moretti, A.
name: Perna, R.
name: Romano, P.
name: Tagliaferri, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: It is now recognized that long-duration Gamma-Ray Bursts (GRBs) are linked to the collapse of massive stars, based on the association between (low-redshift) GRBs and (type Ic) core-collapse supernovae (SNe). The census of massive stars and GRBs reveals, however, that not all massive stars do produce a GRB. Only ~1% of core collapse SNe are able to produce a highly relativistic collimated outflow, and hence a GRB. The extra crucial parameter has long been suspected to be metallicity and/or rotation. We find observational evidence strongly supporting that both ingredients are necessary in order to make a GRB out of a core-collapsing star. A detailed study of the absorption pattern in the X-ray spectrum of GRB060218 reveals evidence of material highly enriched in low atomic number metals ejected before the SN/GRB explosion. We find that, within the current scenarios of stellar evolution, only a progenitor star characterized by a fast stellar rotation and sub-solar initial metallicity could produce such a metal enrichment in its close surrounding.
description: ApJL in press 4 pages 2 figures
Zeta functions and topological entropy of the Markov-Dyck shifts
Creators: name: Krieger, Wolfgang
name: Matsumoto, Kengo
Publisher: name: arXiv
Year: 2007
Subjects: subject: Dynamical Systems (math.DS)
subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 37B10

description: The Markov-Dyck shifts arise from finite directed graphs. An expression for the zeta function of a Markov-Dyck shift is given. The derivation of this expression is based on a formula in Keller (G. Keller, {\it Circular codes, loop counting, and zeta-functions}, J. Combinatorial Theory {\bf 56} (1991), pp. 75--83). For a class of examples that includes the Fibonacci-Dyck shift the zeta functions and topological entropy ae determined.
description: 12 pages, 1 figure
Visualizing computation in large-scale cellular automata
Creators: name: Cisneros, Hugo
name: Sivic, Josef
name: Mikolov, Tomas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cellular Automata and Lattice Gases (nlin.CG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Emergent processes in complex systems such as cellular automata can perform computations of increasing complexity, and could possibly lead to artificial evolution. Such a feat would require scaling up current simulation sizes to allow for enough computational capacity. Understanding complex computations happening in cellular automata and other systems capable of emergence poses many challenges, especially in large-scale systems. We propose methods for coarse-graining cellular automata based on frequency analysis of cell states, clustering and autoencoders. These innovative techniques facilitate the discovery of large-scale structure formation and complexity analysis in those systems. They emphasize interesting behaviors in elementary cellular automata while filtering out background patterns. Moreover, our methods reduce large 2D automata to smaller sizes and enable identifying systems that behave interestingly at multiple scales.
Alexander von Plato, Tomáš Vilímek, Opposition als Lebensform. Dissidenz in der DDR, der ČSSR und in Polen
Creators: name: Alber, Ina
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2015

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 64 Nr. 1 (2015)
Bulge n and B/T in High Mass Galaxies: Constraints on the Origin of Bulges in Hierarchical Models
Creators: name: Weinzirl, Tim
name: Jogee, Shardha
name: Khochfar, Sadegh
name: Burkert, Andreas
name: Kormendy, John
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We use the bulge Sersic index n and bulge-to-total ratio (B/T) to explore the fundamental question of how bulges form. We perform 2D bulge-disk-bar decomposition on H-band images of 143 bright, high stellar mass (>1.0e10 solar masses) low-to-moderately inclined (i<70 degrees) spirals. Our results are: (1) Our H-band bar fraction (~58%) is consistent with that from ellipse fits. (2) 70% of the stellar mass is in disks, 10% in bars, and 20% in bulges. (3) A large fraction (~69%) of bright spirals have B/T<0.2, and ~76% have low n<2 bulges. These bulges exist in barred and unbarred galaxies across a wide range of Hubble types. (4) About 65% (68%) of bright spirals with n<2 (B/T<0.2) bulges host bars, suggesting a possible link between bars and bulges. (5) We compare the results with predictions from a set of LCDM models. In the models, a high mass spiral can have a bulge with a present-day low B/T<0.2 only if it did not undergo a major merger since z<2. The predicted fraction (~1.6%) of high mass spirals, which have undergone a major merger since z<4 and host a bulge with a present-day low B/T<0.2, is a factor of over thirty smaller than the observed fraction (~66%) of high mass spirals with B/T<0.2. Thus, contrary to common perception, bulges built via major mergers since z<4 seriously fail to account for the bulges present in ~66% of high mass spirals. Most of these present-day low B/T<0.2 bulges are likely to have been built by a combination of minor mergers and/or secular processes since z<4.
description: Accepted by the Astrophysical Journal. 42 pages of text, 27 figures, 12 tables
Sangue che uccide. Il committente, il pubblico e il poeta nell' Epinicio V di Bacchilide
Creators: name: Antoniono, Maria Elena
name: Cesca, Ombretta
Publisher: name: Annali Online  Lettere - Ferrara
Year: 2012

description: Bacchylides’ Epinicion V to Hieron of Siracusa celebrates the  tyrant’s victory in 476 B.C. at Olympia. The epinicion tells the myth of  Meleager’s death with an interesting and unusual link with Heracles,  the two characters meeting each other in the underworld. Meleager tells  the story of his death at the hands of his mother, who meant to protect  other family links. Heracles, impressed by Meleager’s beauty and deeply  moved by his words, asks him if he has a sister of marriageable age,  thus choosing with this question his own destiny as well: Deianira, just  like Meleager’s mother, will kill Heracles. At first sight the  atmosphere of the epinicion is gloomy and not appropriate to celebrate a  bright victory. This seems to give a warning to the lucky tyrant to not  exaggerate in being proud. On the other hand, Bacchylides’ choice to  associate two heroes whose death is caused by family members seems to  criticize oligarchic family clans. Reading the epinicion carefully, it  seems to have a double meaning: the first belittles the tyrant’s  victory, gratifying his enemies, i.e. the clans; the second criticizes  the oligarchy, pleasing Hieron. This situation could reflect the will of  the poet to gratify, during his performance, the tyrant who  commissioned the poem, but at the same time not to lose the approval of  the oligarchic public, who could commission other poems in the future.
description: Annali Online  Lettere - Ferrara, VI 1-2 (2011)
Stable Sarma State in Two-band Fermi Systems
Creators: name: He, Lianyi
name: Zhuang, Pengfei
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate fermionic superconductivity with mismatched Fermi surfaces in a general two-band system. The exchange interaction between the two bands changes significantly the stability structure of the pairing states. The Sarma state with two gapless Fermi surfaces which is always unstable in single-band systems, can be the stable ground state in two-band systems. To realize a visible mismatch window for the stable Sarma state, two conditions should be satisfied: a nonzero inter-band exchange interaction and a large asymmetry between the two bands.
description: V3: Version published in Physical Review B
Enchytraeus krumbachi
Creators: name: Erséus, Christer
name: Klinth, Mårten J.
name: Rota, Emilia
name: De Wit, Pierre
name: Gustafsson, Daniel R.
name: Martinsson, Svante
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Clitellata
Enchytraeida
Enchytraeidae
Enchytraeus
Enchytraeus krumbachi

description: Enchytraeus cf. krumbachi (Čejka, 1913) (Fig. 12)
 ? Litorea krumbachi Čejka, 1913: pp. 145–151, figs. 1–10.
 ? E. albidus partim; Lasserre and Erséus 1976: pp. 452– 453.
description: Published as part of Erséus, Christer, Klinth, Mårten J., Rota, Emilia, De Wit, Pierre, Gustafsson, Daniel R. & Martinsson, Svante, 2019, The popular model annelid Enchytraeus albidus is only one species in a complex of seashore white worms (Clitellata, Enchytraeidae), pp. 105-133 in Organisms Diversity & Evolution (New York, N. Y.) (New York, N. Y.) 19 (2) on page 126, DOI: 10.1007/s13127-019-00402-6, http://zenodo.org/record/13344959
New class of sixth-order nonhomogeneous $p(x)$-Kirchhoff problems with sign-changing weight functions
Creators: name: Hamdani, M. K.
name: Chung, N. T.
name: Repovš, D. D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: Primary: 35J55, 35J65, Secondary: 35B65

description: We prove the existence of multiple solutions for the following sixth-order $p(x)$-Kirchhoff-type problem: $-M(\int_Ω\frac{1}{p(x)}|\nabla Δu|^{p(x)}dx)Δ^3_{p(x)} u = λf(x)|u|^{q(x)-2}u + g(x)|u|^{r(x)-2}u + h(x) \ \ \mbox{on} \ Ω$ and $ \ u=Δu=Δ^2 u=0 \ \ \mbox{on} \ \partialΩ,$ where $Ω\subset \mathbb{R}^N$ is a smooth bounded domain, $N > 3$, $Δ_{p(x)}^3u = \operatorname{div}\Big(Δ(|\nabla Δu|^{p(x)-2}\nabla Δu)\Big)$ is the $p(x)$-triharmonic operator, $p,q,r \in C(\overlineΩ)$, $1< p(x) < \frac N3$ for all $x\in \overlineΩ$, $M(s) = a - bs^γ$, $a,b,γ>0$, $λ>0$, $g: Ω\times \mathbb{R} \to \mathbb{R}$ is a nonnegative continuous function while $f,h : Ω\times \mathbb{R} \to \mathbb{R}$ are sign-changing continuous functions in $Ω$. To the best of our knowledge, this paper is one of the first contributions to the study of the sixth-order $p(x)$-Kirchhoff type problems with sign changing Kirchhoff functions.
Ultra-clean radon-free four cylinder magnetically-coupled piston pump
Creators: name: Schulte, D.
name: Murra, M.
name: Schulte, P.
name: Huhmann, C.
name: Weinheimer, C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: A high performance gas displacement pump based on four individual cylinders was developed. The magnetically-coupled pistons and the hermetically-sealed housings as well as the special cleanliness in terms of out-gassing and radio-purity make the four cylinder pump interesting for the usage in low background experiments dealing with noble gases as target. An optimized inner flow path as well as reduced dead volume with respect to the prototype single cylinder pump of the XENON1T experiment combined with advanced polymer piston gaskets and a piston coupling force of (3177 $\pm$ 162) N ensures a high and reliable performance. Furthermore, a phase-shifted synchronization of the pistons' movement creates an additional performance boost as well as minimizes fluctuations of flow and compression. The pump is able to generate xenon flows of 474 slpm at a pressure difference of 1.80 bar.
Investigation on different materials after pulsed high field conditioning and low-energy H- irradiation
Creators: name: Serafim, Catarina
name: Peacock, R.
name: Calatroni, S.
name: Djurabekova, F.
name: Fontenla, A. T.
name: Wuensch, W.
name: Sgobba, S.
name: Grudiev, A.
name: Lombardi, A.
name: Sargsyan, E.
name: Ramberger, S.
name: Bellodi, G.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: During operation, the radio-frequency quadrupole (RFQ) of the LINAC4 at CERN is exposed to high electric fields, which can lead to vacuum breakdown. It is also subject to beam loss, which can cause surface modification, including blistering, which can result in reduced electric field holding and an increased breakdown rate. First, experiments to study the high-voltage conditioning process and electrical breakdown statistics have been conducted using pulsed high voltage DC systems in order to identify materials with high electric field handling capability and robustness to low-energy irradiation. In this paper, we discuss the results obtained for the different materials tested. To complement these, an investigation of their metallurgical properties using advanced microscopic techniques was done to observe and characterize the different materials and to compare results before and after irradiation and breakdown testing.
Thermal Analysis of the Pioneer Anomaly: A method to estimate radiative momentum transfer
Creators: name: Bertolami, Orfeu
name: Francisco, Frederico
name: Gil, Paulo J. S.
name: Páramos, Jorge
Publisher: name: arXiv
Year: 2008
Subjects: subject: Space Physics (physics.space-ph)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present a methodology based on point-like Lambertian sources that enables one to perform a reliable and comprehensive estimate of the overall thermally induced acceleration of the Pioneer 10 and 11 spacecraft. We show, by developing a sensitivity analysis of the several parameters of the model, that one may achieve a valuable insight on the possible thermal origin of the so-called Pioneer anomaly.
description: 12 pages, 8 figures, 5 tables
Negative temperature: further extensions
Creators: name: Volovik, G. E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Other Condensed Matter (cond-mat.other)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: This paper is motivated by the recent paper M. Baldovin, S. Iubini, R. Livi and A. Vulpiani, Statistical mechanics of systems with negative temperature, arXiv:2103.12572. The authors suggest that negative absolute temperatures are consistent with equilibrium thermodynamics. This is correct, if the environment also has negative temperature. Otherwise such states represent the transient though maybe long-lived metastable effects. Here we consider the extension of the negative temperatures to the relativistic systems. We show that the negative state is possible in the Dirac vacuum, which is obtained by the $PT$ symmetry transformation from the conventional Dirac sea. If such vacuum with inverse population fills the whole Universe, its thermodynamics determined by negative temperatures becomes equilibrium.
description: 3 pages, no figures, accepted in JETP letters
On Dynamics and Optimal Number of Replicas in Parallel Tempering Simulations
Creators: name: Nadler, Walter
name: Hansmann, Ulrich H. E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Computational Physics (physics.comp-ph)
subject: Biomolecules (q-bio.BM)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: We study the dynamics of parallel tempering simulations, also known as the replica exchange technique, which has become the method of choice for simulation of proteins and other complex systems. Recent results for the optimal choice of the control parameter discretization allow a treatment independent of the system in question. Analyzing mean first passage times across control parameter space, we find an expression for the optimal number of replicas in simulations covering a given temperature range. Our results suggest a particular protocol to optimize the number of replicas in actual simulations.
description: 4 pages, 2 figures, submitted
How Many CVs are Crossing the Period Gap? A Test for the Disruption of Magnetic Braking
Creators: name: Davis, P. J.
name: Kolb, U.
name: Willems, B.
name: Gänsicke, B. T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We apply population synthesis techniques to calculate the present day number of two types of white dwarf-main sequence star (WDMS) binaries within the cataclysmic variable period gap. The first are post-common envelope binaries with secondary stars that have masses between 0.17 and 0.36 Msun (gPCEBs), such that they will commence mass transfer within the period gap. The second type are systems that were CVs at some point in their past, but detached once they evolved down in orbital period to ~3 h as a consequence of disrupted magnetic braking, and are crossing the period gap via gravitational radiation (dCVs). Full population synthesis calculations are performed where we assume either constant, global values of the common envelope ejection efficiency, or consider the ejection efficiency as a function of secondary mass. Several forms of magnetic braking are also considered. We predict an excess of dCVs over gPCEBs within the period gap of ~4 to ~13 assuming an ejection efficiency between 0.1 and 0.6, and a flat initial mass ratio distribution. This excess is revealed as a prominent peak at the location of the period gap in the orbital period distribution of the combined gPCEB and dCV population. We suggest that if such a feature is observed in the orbital period distribution of an observed sample of short orbital period WDMS binaries, this would strongly corroborate the disruption of magnetic braking.
description: Accepted for publication in Monthly Notices of the Royal Astronomical Society; typo corrected in section 4.5; extra figure added
Fighting off field dependence in MSSM Higgs-mass corrections of order $α_t\,α_s$ and $α_t^2$
Creators: name: Domingo, Florian
name: Paßehr, Sebastian
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The connection between gauge and Higgs sectors makes supersymmetric extensions of the Standard Model predictive frameworks for the derivation of Higgs masses. In this paper, we study the contamination of such predictions by field-renormalization constants, in the MSSM with two-loop gaugeless corrections of $\mathcal{O}{\left(α_{t,b}\,α_s,\,α_{t,b}^2\right)}$ and full momentum dependence, and demonstrate how strict perturbative expansions allow to systematically neutralize the dependence on such unphysical objects. On the other hand, the popular procedure consisting in an iterative pole search remains explicitly dependent on field counterterms. We then analyze the magnitude of the intrinsic uncertainty that this feature implies for the iterative method, both in non-degenerate and near-degenerate regimes, and conclude that this strategy does not improve on the predictions of the more straightforward expansion. We also discuss several features related to the inclusion of the orders $α_{t,b}\,α_s$ and $α_{t,b}^2$ in the so-called 'fixed-order' approach, such as the resummation of UV-logarithms for heavy supersymmetric spectra.
description: 43 pages, 12 figures
Jerzy Kochanowski, Jenseits der Planwirtschaft. Der Schwarzmarkt in Polen 1944-1989
Creators: name: Feindt, Gregor
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2015

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 64 Nr. 1 (2015)
Search for New Particles Leading to Z+jets Final States in $p\bar{p}$ Collisions at $\sqrt{s}=1.96$ TeV
Creators: name: CDF Collaboration
name: Aaltonen, T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present the results of a search for new particles that lead to a \Z boson plus jets in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV using the Collider Detector at Fermilab (CDF II). A data sample with a luminosity of 1.06 \ifb\ collected using \Z boson decays to $ee$ and $μμ$ is used. We describe a completely data-based method to predict the dominant background from standard-model \Z+jet events. This method can be similarly applied to other analyses requiring background predictions in multi-jet environments, as shown when validating the method by predicting the background from $W$+jets in \ttbar production. No significant excess above the background prediction is observed, and a limit is set using a fourth generation quark model to quantify the acceptance. Assuming $BR(b' \to b\Z) = 100%$ and using a leading-order calculation of the $b'$ cross section, $b'$ quark masses below 268 $\gev/c^2$ are excluded at 95% confidence level.
description: To be submitted to PRD
Signal processing algorithms and specifications
Creators: name: Kühne, Thomas
name: Caire, Giuseppe
name: Song, Xiaoshen
Publisher: name: Zenodo
Year: 2018
Subjects: Specification,
signal processing
hybrid digital-analog beamforming
multiuser multiple-input multiple-output

description: This document describes the signal processing of the SERENA 5G 39 GHz proof-of-concept demonstrator. The report introduces different signal processing aspects of the system including the hybrid digital-analog architecture, the initial acquisition phase, and the multiuser multiple-input multipleoutput precoding. It proposes solutions for these problems and describes them theoretically.
Discovery of an M9.5 Candidate Brown Dwarf in the TW Hydrae Association - DENIS J124514.1-442907
Creators: name: Looper, Dagny L.
name: Burgasser, Adam J.
name: Kirkpatrick, J. Davy
name: Swift, Brandon J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the discovery of a fifth candidate substellar system in the ~5-10 Myr TW Hydrae Association - DENIS J124514.1-442907. This object has a NIR spectrum remarkably similar to that of 2MASS J1139511-315921, a known TW Hydrae brown dwarf, with low surface gravity features such as a triangular-shaped H-band, deep H2O absorption, weak alkali lines, and weak hydride bands. We find an optical spectral type of M9.5 and estimate a mass of <24 M_Jup, assuming an age of ~5-10 Myr. While the measured proper motion for DENIS J124514.1-442907 is inconclusive as a test for membership, its position in the sky is coincident with the TW Hydrae Association. A more accurate proper motion measurement, higher resolution spectroscopy for radial velocity, and a parallax measurement are needed to derive the true space motion and to confirm its membership.
description: 8 pages - emulateapj style, 2 figures, 3 tables. Accepted to ApJL. Fixed typos, added reference, added footnote
Unbounded-error One-way Classical and Quantum Communication Complexity
Creators: name: Iwama, Kazuo
name: Nishimura, Harumichi
name: Raymond, Rudy
name: Yamashita, Shigeru
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: This paper studies the gap between quantum one-way communication complexity $Q(f)$ and its classical counterpart $C(f)$, under the {\em unbounded-error} setting, i.e., it is enough that the success probability is strictly greater than 1/2. It is proved that for {\em any} (total or partial) Boolean function $f$, $Q(f)=\lceil C(f)/2 \rceil$, i.e., the former is always exactly one half as large as the latter. The result has an application to obtaining (again an exact) bound for the existence of $(m,n,p)$-QRAC which is the $n$-qubit random access coding that can recover any one of $m$ original bits with success probability $\geq p$. We can prove that $(m,n,>1/2)$-QRAC exists if and only if $m\leq 2^{2n}-1$. Previously, only the construction of QRAC using one qubit, the existence of $(O(n),n,>1/2)$-RAC, and the non-existence of $(2^{2n},n,>1/2)$-QRAC were known.
description: 9 pages. To appear in Proc. ICALP 2007
Maciej Górny, „Die Wahrheit ist auf unserer Seite“. Nation, Marxismus und Geschichte im Ostblock
Creators: name: Laczó, Ferenc
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2015

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 64 Nr. 1 (2015)
On the Chow ring of Fano varieties on the Fatighenti-Mongardi list
Creators: name: Laterveer, Robert
Publisher: name: arXiv
Year: 2021
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14C15

description: Conjecturally, Fano varieties of K3 type admit a multiplicative Chow-Künneth decomposition, in the sense of Shen-Vial. We prove this for many of the families of Fano varieties of K3 type constructed by Fatighenti-Mongardi. This has interesting consequences for the Chow ring of these varieties.
description: 17 pages, to appear in Comm. in Algebra, comments welcome. arXiv admin note: text overlap with arXiv:2009.11061. v2: updated references
Generalized Adiabatic Theorems: Quantum Systems Driven by Modulated Time-Varying Fields
Creators: name: Dodin, Amro
name: Brumer, Paul
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We present generalized adiabatic theorems for closed and open quantum systems that can be applied to slow modulations of rapidly varying fields, such as oscillatory fields that occur in optical experiments and light induced processes. The generalized adiabatic theorems show that a sufficiently slow modulation conserves the dynamical modes of time dependent reference Hamiltonians. In the limiting case of modulations of static fields, the standard adiabatic theorems are recovered. Applying these results to periodic fields shows that they remain in Floquet states rather than in energy eigenstates. More generally, these adiabatic theorems can be applied to transformations of arbitrary time-dependent fields, by accounting for the rapidly varying part of the field through the dynamical normal modes, and treating the slow modulation adiabatically. As examples, we apply the generalized theorem to (a) predict the dynamics of a two level system driven by a frequency modulated resonant oscillation, a pathological situation beyond the applicability of earlier results, and (b) to show that open quantum systems driven by slowly turned-on incoherent light, such as biomolecules under natural illumination conditions, can only display coherences that survive in the steady state.
Emission spectrum of a dressed exciton-biexciton complex in a semiconductor quantum dot
Creators: name: Muller, Andreas
name: Fang, Wei
name: Lawall, John
name: Solomon, Glenn S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The photoluminescence spectrum of a single quantum dot was recorded as a secondary resonant laser optically dressed either the vacuum-to-exciton or the exciton-to-biexciton transitions. High-resolution polarization-resolved measurements using a scanning Fabry-Perot interferometer reveal splittings of the linearly-polarized fine-structure states that are non-degenerate in an asymmetric quantum dot. These splittings manifest as either triplets or doublets and depend sensitively on laser intensity and detuning. Our approach realizes complete resonant control of a multi-excitonic system in emission, which can be either pulsed or continuous-wave, and offers direct access to the emitted photons.
description: 4 pages, 4 figures
Classical threshold law for the formation of van der Waals molecules
Creators: name: Mirahmadi, Marjan
name: Pérez-Ríos, Jesús
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: We study the role of pairwise long-range interactions in the formation of van der Waals molecules through direct three-body recombination processes A + B + B $\rightarrow$ AB + B, based on a classical trajectory method in hyperspherical coordinates developed in our earlier works [J. Chem. Phys. 140, 044307 (2014); J. Chem. Phys. 154, 034305 (2021)]. In particular, we find the effective long-range potential in hyperspherical coordinates with an exact expression in terms of dispersion coefficients of pairwise potentials. Exploiting this relation, we derive a classical threshold law for the total cross section and the three-body recombination rate yielding an analytical expression for the three-body recombination rate as a function of the pairwise long-range coefficients of the involved partners.
description: 9 pages, 5 figures, submitted to The Journal of Chemical Physics
Pairing within the self-consistent quasiparticle random-phase approximation at finite temperature
Creators: name: Dang, N. Dinh
name: Hung, N. Quang
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: An approach to pairing in finite nuclei at nonzero temperature is proposed, which incorporates the effects due to the quasiparticle-number fluctuation (QNF) around Bardeen-Cooper-Schrieffer (BCS) mean field and dynamic coupling to quasiparticle-pair vibrations within the self-consistent quasiparticle random-phase approximation (SCQRPA). The numerical calculations of pairing gap, total energy, and heat capacity were carried out within a doubly folded multilevel model as well as realistic nuclei $^{56}$Fe and $^{120}$Sn. The results obtained show that, under the effect of QNF, in the region of moderate and strong couplings, the sharp transition between the superconducting and normal phases is smoothed out, resulting in a thermal pairing gap, which does not collapse at the BCS critical temperature, but has a tail, which extends to high temperature. The dynamic coupling of quasiparticles to SCQRPA vibrations significantly improves the agreement with the results of exact calculations and those obtained within the finite-temperature quantal Monte Carlo method for the total energy and heat capacity. It also causes a deviation of the quasiparticle occupation numbers from the Fermi-Dirac distributions for free fermions.
description: 31 pages, 6 figures. Some missing fonts are corrected. Accepted in Phys. Rev. C
Laelia perezgarciae Cetzal & Carnevali 2020, comb. nov.
Creators: name: Cetzal-Ix, William
name: Carnevali, Germán
name: Jiménez-Machorro, Rolando
name: Pérez-García, Eduardo A.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Asparagales
Orchidaceae
Laelia
Laelia perezgarciae

description: Laelia perezgarciae (Archila & Szlachetko) Cetzal & Carnevali, comb. nov.
Basionym:— Encabarcenia perezgarciae Archila & Szlach., Revista Guatemalensis (2014: 27). – Schomburgkia perezgarciae (Archila & Szlachetko) Peraza & Carnevali, Taxon (2016:1259).
Type:— GUATEMALA. Suchitepéquez: Mazatenango, 350 m, Jun 1999, F. Archila Morales FA-sn (Holotype, BIGU!).
This entity is apparently known only from the type collection. Knowing the wide range of variation of Laelia rubescens, this entity may be nothing more than a showy variant of that species. The original diagnosis of L. perezgarciae in Latin fails to indicate other features to diagnose it from Laelia rubescens besides the rhombic petals (“ Petalis rhombici ….”), which are found in isolated individuals of L. rubescens. The schematic illustration provided by the authors features rhombic petals and midlobe.
description: Published as part of Cetzal-Ix, William, Carnevali, Germán, Jiménez-Machorro, Rolando & Pérez-García, Eduardo A., 2020, Laelia × meavei: A new natural hybrid between L. dawsonii fo. dawsonii and L. rubescens fo. peduncularis (Orchidaceae: Laeliinae) from Oaxaca, Mexico, pp. 81-94 in Phytotaxa 446 (2) on page 91, DOI: 10.11646/phytotaxa.446.2.1, http://zenodo.org/record/13877849
Neon and Sulfur Abundances of Planetary Nebulae in the Magellanic Clouds
Creators: name: Bernard-Salas, J.
name: Pottasch, S. R.
name: Gutenkunst, S.
name: Morris, P. W.
name: Houck, J. R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The chemical abundances of neon and sulfur for 25 planetary nebulae (PNe) in the Magellanic Clouds are presented. These abundances have been derived using mainly infrared data from the Spitzer Space Telescope. The implications for the chemical evolution of these elements are discussed. A comparison with similarly obtained abundances of Galactic PNe and HII regions and Magellanic Clouds HII regions is also given. The average neon abundances are 6.0x10(-5) and 2.7x10(-5) for the PNe in the Large and Small Magellanic Clouds respectively. These are ~1/3 and 1/6 of the average abundances of Galactic planetary nebulae to which we compare. The average sulfur abundances for the LMC and SMC are respectively 2.7x10(-6) and 1.0x10(-6). The Ne/S ratio (23.5) is on average higher than the ratio found in Galactic PNe (16) but the range of values in both data sets is similar for most of the objects. The neon abundances found in PNe and HII regions agree with each other. It is possible that a few (3-4) of the PNe in the sample have experienced some neon enrichment, but for two of these objects the high Ne/S ratio can be explained by their very low sulfur abundances. The neon and sulfur abundances derived in this paper are also compared to previously published abundances using optical data and photo-ionization models.
description: 13 pages, 4 tables, 5 figures. Accepted for publication in ApJ
The Simulated Sky: Stellarium for Cultural Astronomy Research
Creators: name: Zotti, Georg
name: Hoffmann, Susanne M
name: Wolf, Alexander
name: Chéreau, Fabien
name: Chéreau, Guillaume
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Graphics (cs.GR)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: For centuries, the rich nocturnal environment of the starry sky could be modelled only by analogue tools such as paper planispheres, atlases, globes and numerical tables. The immersive sky simulator of the twentieth century, the optomechanical planetarium, provided new ways for representing and teaching about the sky, but the high construction and running costs meant that they have not become common. However, in recent decades, "desktop planetarium programs" running on personal computers have gained wide attention. Modern incarnations are immensely versatile tools, mostly targeted towards the community of amateur astronomers and for knowledge transfer in transdisciplinary research. Cultural astronomers also value the possibilities they give of simulating the skies of past times or other cultures. With this paper, we provide an extended presentation of the open-source project Stellarium, which in the last few years has been enriched with capabilities for cultural astronomy research not found in similar, commercial alternatives.
description: https://journal.equinoxpub.com/JSA/issue/view/1762
Pure Spinor Formalism for Osp(N|4) backgrounds
Creators: name: Fré, Pietro
name: Grassi, Pietro Antonio
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We start from the Maurer-Cartan (MC) equations of the Osp(N|4) superalgebras satisfied by the left-invariant super-forms realized on supercoset manifolds of the corresponding supergroups and we derive some new pure spinor constraints. They are obtained by "ghostifying" the MC forms and extending the differential d to a BRST differential. From the superalgebras G =Osp(N|4) we single out different subalgebras H contained in G associated with the different cosets G/H: each choice of H leads to a different weakening of the pure spinor constraints. In each case, the number of parameter is counted and we show that in the cases of Osp(6|4)/U(3) x SO(1,3), Osp(4|4)/SO(3) x SO(1,3) and finally Osp(4|4) U(2)} x SO(1,3) the bosonic and fermionic degrees of freedom match in order to provide a c=0 superconformal field theory. We construct both the Green-Schwarz and the pure spinor sigma model for the case Osp(6|4)/U(3)x SO(1,3) corresponding to AdS_4 x P^3. The pure spinor sigma model can be consistently quantized.
description: 25 pp, latex, Misprints, improvements in the last section and references added
The "footprints'' of irreversibility
Creators: name: Gomez-Marin, A.
name: Parrondo, J. M. R.
name: Broeck, C. Van den
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We reformulate the result for the entropy production given in Phys. Rev. Lett. 98, 080602 (2007) in terms of the relative entropy of microscopic trajectories. By a combination with the Crook's theorem, we identify the path variables that are sufficient to fully identify irreversibility. We show that work saturates the relative entropy, and derive the entropy production for stochastic descriptions.
description: 4 pages, no figures
New Moons of Uranus and Neptune from Ultra-Deep Pencil Beam Surveys
Creators: name: Sheppard, Scott
name: Tholen, David
name: Brozovic, Marina
name: Jacobson, Robert
name: Trujillo, Chadwick
name: Lykawka, Patryk Sofia
name: Alexandersen, Mike
Publisher: name: arXiv
Year: 2024
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We have conducted extremely ultra-deep pencil beam observations for new satellites around both Uranus and Neptune. Tens of images on several different nights in 2021, 2022 and 2023 were obtained and shifted and added together to reach as faint as 26.9 and 27.2 magnitudes in the r-band around Uranus and Neptune, respectively. One new moon of Uranus, S/2023 U1, and two new moons of Neptune, S/2021 N1 and S/2002 N5, were found. S/2023 U1 was 26.6 mags, is about 7 km in diameter and has a distant, eccentric and inclined retrograde orbit similar to Caliban and Stephano, implying these satellites are fragments from a once larger parent satellite. S/2023 U1 almost completely overlaps Stephano in orbital phase space. S/2021 N1 was 26.9 mags, about 14 km in size and has a retrograde orbit similar to Neso and Psamathe, indicating they are a dynamical family. We find S/2021 N1 is in a Kozai-Lidov orbital resonance. S/2002 N5 was 25.9 mags, is about 23 km in size and it makes a family of distant prograde satellites with Sao and Laomedeia. All three new moons show for the first time dynamical groups of moons exist around both Uranus and Neptune. The creation of these groups likely produced dust that could be the source of red material seen on the leading hemispheres of some larger inner satellites like Titania, Oberon and Umbriel. We also detected all known outer moons of Uranus and Neptune on multiple nights. This survey mostly completes the outer satellites of Uranus to about 8 km and Neptune to about 14 km in diameter. The size distributions of satellite dynamical families around the giant planets shows a strong steepening in the power law size distribution smaller than 5 km in diameter. The satellites of a family become much more common smaller than 5 km and their size distribution is consistent with a collisional break-up of a once larger parent satellite.
description: Accepted Astronomical Journal
Stellar Population Challenge: analysis of M67 with the VO
Creators: name: Cervino, M.
name: Gutierrez, R.
name: Solano, E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this poster we present the analysis of the CMD of M67 (proposed in the Stellar Population Challenge) performed with VO applications. We found that, although the VO environment is still not ready to perform a complete analysis, its use provides highly useful additional information for the analysis. Thanks to the current VO framework, we are able to identify stars in the provided CMD that are not suitable for isochrone fitting. Additionally, we can complete our knowledge of this cluster extending the analysis to IR colors, which were not provided in the original data but that are available thanks to the VO. On the negative side, we find it difficult to access theoretical data from VO applications, so, currently, it is not possible to perform completely the analysis of the cluster inside the VO framework. However it is expected that the situation will improve in a near future.
description: Stellar Populations as Building Blocks of Galaxies, Proceedings of IAU Symposium #241. Edited by A. Vazdekis and R. F. Peletier. Cambridge: Cambridge University Press, 2007, pp. 173-174
Confined and eruptive catastrophes of solar magnetic flux ropes caused by mass loading and unloading
Creators: name: Zhang, Quanhao
name: Liu, Rui
name: Wang, Yuming
name: Li, Xiaolei
name: Lyu, Shaoyu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: It is widely accepted that coronal magnetic flux ropes are the core structures of large-scale solar eruptive activities, which inflict dramatic impacts on the solar-terrestrial system. Previous studies have demonstrated that varying magnetic properties of a coronal flux rope system could result in a catastrophe of the rope, which may trigger solar eruptive activities. Since the total mass of a flux rope also plays an important role in stabilizing the rope, we use 2.5-dimensional magnetohydrodynamic (MHD) numerical simulations in this letter to investigate how a flux rope evolves as its total mass varies. It is found that an unloading process that decreases the total mass of the rope could result in an upward (eruptive) catastrophe in the flux rope system, during which the rope jumps upward and the magnetic energy is released. This indicates that mass unloading processes could initiate the eruption of the flux rope. Moreover, when the system is not too diffusive, there is also a downward (confined) catastrophe that could be caused by mass loading processes, via which the total mass accumulates. The magnetic energy, however, is increased during the downward catastrophe, indicating that mass loading processes could cause confined activities that may contribute to the storage of energy before the onset of coronal eruptions.
description: This paper has been accepted by The Astrophysical Journal
Analog of gravitational anomaly in topological chiral superconductors
Creators: name: Volovik, G. E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: It is known that the contribution of torsion to the equation for the chiral Weyl fermions can be equivalently considered in terms of the axial $U(1)$ gauge field. In this scenario the gravitational field transforms to the $U(1)$ gauge field. Here we show that in chiral superconductors the opposite scenario takes place: the electromagnetic $U(1)$ field serves as the spin connection for the Bogoliubov fermionic quasiparticles. As a result the electromagnetic field gives rise to the gravitational anomaly, which contains the extra factor $1/3$ in the corresponding Adler-Bell-Jackiw equation as compared with the conventional chiral anomaly. We also consider the gravitational anomaly produced in neutral Weyl superfluids by the analog of the gravitational instanton, the process of creation and annihilation of the 3D topological objects -- hopfions. The gravitational instanton leads to creation of the chiral charge.
description: 4 pages, no figures, JETP Letters 113, issue 8 (2021)
General Conditions for Lepton Flavour Violation at Tree- and 1-Loop Level
Creators: name: Blum, Alexander
name: Merle, Alexander
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this work, we compile the necessary and sufficient conditions a theory has to fulfill in order to ensure general lepton flavour conservation, in the spirit of the Glashow-Weinberg criteria for the absence of flavour-changing neutral currents. At tree-level, interactions involving electrically neutral and doubly charged bosons are investigated. We also investigate flavour changes at 1-loop level. In all cases we find that the essential theoretical requirements can be reduced to a few basic conditions on the particle content and the coupling matrices. For 1-loop diagrams, we also investigate how exactly a GIM-suppression can occur that will strongly reduce the rates of lepton flavour violating effects even if they are in principle present in a certain theory. In all chapters, we apply our criteria to several models which can in general induce lepton flavour violation, e.g. LR-symmetric models or the MSSM. In the end we give a summarizing table of the obtained results, thereby demonstrating the applicability of our criteria to a large class of models beyond the Standard Model.
description: 31 pages, 2 figures