cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Sterile neutrino searches at tagged kaon beams
Creators: name: Delgadillo, Luis
name: Huber, Patrick
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Tagged kaon beams are attractive neutrino sources, which would provide flavor pure $ν_e$-beams with exactly measured normalization. We point out that this also leads to an anti-tagged flavor pure $ν_μ$-beam, with equally well known normalization. Exposing a 1 kt liquid argon detector at a baseline of 1 km to this combination of unique beams allows to decisively test recent indications by IceCube and Neutrino-4 of sterile neutrino oscillations in the multi-eV range.
description: 5 pages, 3 figures
An ac-susceptibility study of magnetic relaxation phenomena in the antiskyrmion hosting tetragonal Mn-Pt(Pd)-Sn system
Creators: name: Madduri, P. V. Prakash
name: Sen, Subir
name: Giri, Bimalesh
name: Chakrabartty, Dola
name: Manna, Subhendu K
name: Parkin, Stuart S. P.
name: Nayak, Ajaya K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Here, we report an exhaustive study of the frequency-dependent ac-magnetic susceptibility of the $D_{2d}$ symmetric Heusler system Mn-Pt(Pd)-Sn that hosts antiskyrmions over a wide temperature range. Magnetic relaxation studies using Cole-Cole formalism reveal a Debye-type relaxation with a nearly negligible distribution in relaxation times. In contrast to the archetypical skyrmion hosts, the high Curie temperature ($ T_C $) of the present system ensures shorter switching times, and, correspondingly, higher frequencies are required to probe the relaxation dynamics. We find a non-monotonic variation in the characteristic relaxation time with distinct maxima at the phase boundaries \textit{via} helical $\longrightarrow$ antiskyrmion $\longrightarrow$ field-polarized states, indicating slower magnetization dynamics over the region of phase coexistence. The temperature-dependent relaxation time across different phases is of the order of $ 10^{-5} - 10^{-4} $ s and follows the well-known Arrhenius law with reasonable values of the energy barriers. The present study concerning the magnetization dynamics in the antiskyrmion host tetragonal Heusler system is an important contribution towards the basic understanding of the dynamical aspects of antiskyrmions for their potential applications.
Mapping properties of fundamental operators in harmonic analysis related to Bessel operators
Creators: name: Betancor, Jorge J.
name: Harboure, Eleonor
name: Nowak, Adam
name: Viviani, Beatriz
Publisher: name: arXiv
Year: 2008
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 42C05 (Primary), 42C15 (Secondary)

description: We prove sharp power-weighted strong type, weak type and restricted weak type inequalities for the heat and Poisson integral maximal operators, Riesz transform and a Littlewood-Paley type square function, emerging naturally in the harmonic analysis related to Bessel operators.
description: 31 pages with 2 figures
Steigerung der Ressourceneffizienz durch gesamtbetriebliche Optimierung der Pflanzen- und Milchproduktion unter Einbindung von Tierwohlaspekten – Untersuchungen in einem Netzwerk von Pilotbetrieben
Creators: name: Hülsbergen, Kurt-Jürgen
name: Schmid, Harald
name: Paulsen, Hans Marten
name: Hülsbergen, Kurt-Jürgen
name: Schmid, Harald
name: Paulsen, Hans Marten
Publisher: name: Unknown
Year: 2022
Subjects: subject: Agribusiness
subject: Production Economics
subject: Nachhaltigkeit
subject: Ressourceneffizienz
subject: Klimawirkung
subject: Tierwohl
subject: Betriebssysteme
subject: Pilotbetriebe
subject: sustainability
subject: resource-efficiency
subject: climate effects
subject: animal welfare
subject: farming systems
subject: pilot farms

description: In close cooperation between research, extension and practice, a Germany-wide network of pilot farms was established, which formed the basis for transdisciplinary research work over a period of ten years. It comprises 40 organic and 40 conventional cash crop and dairy farms in four agricultural regions. On the pilot farms, farm data were continuously collected, stored in databases and comprehensively evaluated with models. In project phase 1 (2008 to 2013), research was conducted on climate impacts in crop production and dairy farming, and in project phase 2 (2013 to 2014) on animal welfare and resource efficiency. Whole farm optimisation was the focus of research in project phase 3 (2014 to 2021). In workshops, measures were derived to increase resource efficiency, reduce greenhouse gas emissions and improve husbandry conditions in dairy production. Effects on soil organic matter, nutrient, energy and greenhouse gas balances were investigated with models. Animal welfare was assessed with indicators using the Welfare Quality® Protocol and measures for improvement were derived. The research results show system- related differences in environmental and climate impacts, resource efficiency and animal welfare status between organic and conventional farms, which are, however, overlaid by the enormous individual farm variability and site influences. In the project, the advisory tools HUNTER (humus, nutrient, greenhouse gas and energy balance calculator) and TWT dairy cattle (animal welfare tool dairy cattle) were developed and tested. Hereby farmers and advisors are provided with practical tools for independent analysis and determination of important sustainability criteria. Farm managers were actively involved in the research process, e.g. through the participatory elaboration of development scenarios to improve sustainability and the joint implementation of regional and optimisation workshops.
description: DOI:10.3220/REP1646034190000
Galaxy Image Restoration with Shape Constraint
Creators: name: Nammour, Fadi
name: Schmitz, Morgan A.
name: Mboula, Fred Maurice Ngolè
name: Starck, Jean-Luc
name: Girard, Julien N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Image and Video Processing (eess.IV)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: J.2; I.4.4
subject: 85-08, 85-04, 68U10, 94A08

description: Images acquired with a telescope are blurred and corrupted by noise. The blurring is usually modeled by a convolution with the Point Spread Function and the noise by Additive Gaussian Noise. Recovering the observed image is an ill-posed inverse problem. Sparse deconvolution is well known to be an efficient deconvolution technique, leading to optimized pixel Mean Square Errors, but without any guarantee that the shapes of objects (e.g. galaxy images) contained in the data will be preserved. In this paper, we introduce a new shape constraint and exhibit its properties. By combining it with a standard sparse regularization in the wavelet domain, we introduce the Shape COnstraint REstoration algorithm (SCORE), which performs a standard sparse deconvolution, while preserving galaxy shapes. We show through numerical experiments that this new approach leads to a reduction of galaxy ellipticity measurement errors by at least 44%.
description: 22 pages, 6 figures, 1 table, accepted in Journal of Fourier Analysis and Applications
Photocurrent Imaging of Multi-Memristive Charge Density Wave Switching in Two-Dimensional 1T-TaS2
Creators: name: Patel, Tarun
name: Okamoto, Junichi
name: Dekker, Tina
name: Yang, Bowen
name: Gao, Jingjing
name: Luo, Xuan
name: Lu, Wenjian
name: Sun, Yuping
name: Tsen, Adam W.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Transport studies of atomically thin 1T-TaS2 have demonstrated the presence of intermediate resistance states across the nearly commensurate (NC) to commensurate (C) charge density wave (CDW) transition, which can be further switched electrically. While this presents exciting opportunities for the material in memristor applications, the switching mechanism has remained elusive and could be potentially attributed to the formation of inhomogeneous C and NC domains across the 1T-TaS2 flake. Here, we present simultaneous electrical driving and scanning photocurrent imaging of CDWs in ultrathin 1T-TaS2 using a vertical heterostructure geometry. While micron-sized CDW domains form upon changing temperature, electrically driven transitions result in largely uniform changes, indicating that states of intermediate resistance for the latter likely correspond to true metastable CDW states in between the NC and C phases, which we then explain by a free energy analysis. Additionally, we are able to perform repeatable and bidirectional switching across the multiple CDW states without changing sample temperature, demonstrating that atomically thin 1T-TaS2 can be further used as a robust and reversible multi-memristor material.
description: This is a preprint of an article accepted for publication in Nano Letters(2020)
A New Young Galactic Supernova Remnant Containing a Compact Object: G15.9+0.2
Creators: name: Reynolds, S. P.
name: Borkowski, K. J.
name: Hwang, U.
name: Harrus, I.
name: Petre, R.
name: Dubner, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We identify the radio-emitting shell-type supernova remnant G15.9+0.2 as a relatively young remnant containing an X-ray point source that may be its associated neutron star. The integrated spectrum of the remnant shell obtained from our 30 ks exploratory Chandra observation shows very strong lines that require elevated element abundances from ejecta, in particular of sulfur. A plane-shock model fit gives a temperature $kT = 0.9 (0.8, 1.0)$ keV, an ionization timescale $n_et = 6 (4, 9) \times 10^{10}$ cm$^{-3}$ s, and a sulfur abundance of 2.1 (1.7, 2.7) times solar (90% confidence limits). Two-component models with one solar and one enriched component are also plausible, but are not well constrained by the data. Various estimates give a remnant age of order $10^3$ yr, which would make G15.9+0.2 among the dozen or so youngest remnants in the Galaxy. The sparse point source spectrum is consistent with either a steep $Γ\sim$ 4 power law or a $kT \sim$ 0.4 keV blackbody. The spectrum is absorbed by a H column density $N_H \sim 4 \times 10^{22}$ cm$^{-2}$ similar to that required for the remnant shell. The implied 2--9.5 keV source luminosity is about $10^{33}$ ergs s$^{-1}$ for an assumed distance of 8.5 kpc consistent with the high absorption column. We suggest that the point source is either a rotation-powered pulsar or a compact central object (CCO).
description: 4 pages, 3 figures. Accepted by ApJ Letters
Rough translation of file 025_B (collection LA 256)
Creators: name: Parker, Verdena
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio file VP-100814-04: Rough translation (minute-by-minute) of file 025_B (tape 025, side B) from LA 256 (collection of recordings given to the Berkeley Language Center by Verdena), from 31:02 to the end of the file; no transcription in this session, translation only. Due to re-numbering, tape 025_B has been assigned to the CLA item number LA256.025, audio file LA256.025B.
Leptopharynx brasiliensis Foissner & Omar 2012
Creators: name: Durán-Ramírez, Carlos Alberto
name: Dias, Roberto Júnio Pedroso
name: Estrada, Rosaura Mayén-
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Chromista
Ciliophora
Nassophorea
Nassulida
Leptopharynidae
Leptopharynx
Leptopharynx brasiliensis

description: Leptopharynx brasiliensis Foissner & Omar, 2012
Distribution. MEXICO: Reserve of the Biosphere Chamela-Cuixmala (Durán-Ramírez & Mayén-Estrada 2018), (Bk, Tp, Tr); Dos Lagunas, near village of Tzsiscao (ps), (Tg).
description: Published as part of Durán-Ramírez, Carlos Alberto, Dias, Roberto Júnio Pedroso & Estrada, Rosaura Mayén-, 2020, Checklist of ciliates (Alveolata: Ciliophora) that inhabit in bromeliads from the Neotropical Region, pp. 1-36 in Zootaxa 4895 (1) on page 19, DOI: 10.11646/zootaxa.4895.1.1, http://zenodo.org/record/4321437
Ambipolar magneto-optical response of ultra-low carrier density topological insulators
Creators: name: Chaudhuri, Dipanjan
name: Salehi, Maryam
name: Dasgupta, Sayak
name: Mondal, Mintu
name: Moon, Jisoo
name: Jain, Deepti
name: Oh, Seongshik
name: Armitage, N. P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We have investigated the THz range magneto-optical response of ultralow carrier density films of Sb$_2$Te$_3$ using time-domain THz polarimetry. Undoped Sb$_2$Te$_3$ has a chemical potential that lies inside the bulk valence band. Thus its topological response is masked by bulk carriers. However, with appropriate buffer layer engineering and chemical doping, Sb$_2$Te$_3$ thin films can be grown with extremely low electron or hole densities. The ultralow carrier density samples show unusual optical properties and quantized response in the presence of magnetic fields. Consistent with the expectations for Dirac fermions, a quantized Hall response is seen even in samples where the zero field conductivity falls below detectable levels. The discontinuity in the Faraday angle with small changes in the filling fraction across zero is manifestation of the parity anomaly in 2D Dirac systems with broken time reversal symmetry.
The Calculus of Algebraic Constructions
Creators: name: Blanqui, Frédéric
name: Jouannaud, Jean-Pierre
name: Okada, Mitsuhiro
Publisher: name: arXiv
Year: 2006
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: This paper is concerned with the foundations of the Calculus of Algebraic Constructions (CAC), an extension of the Calculus of Constructions by inductive data types. CAC generalizes inductive types equipped with higher-order primitive recursion, by providing definitions of functions by pattern-matching which capture recursor definitions for arbitrary non-dependent and non-polymorphic inductive types satisfying a strictly positivity condition. CAC also generalizes the first-order framework of abstract data types by providing dependent types and higher-order rewrite rules.
Die Laien vernachlässigen, heißt nichts anderes, als den Frühling aus der Ökumene hinwegzunehmen
Creators: name: Anhelm, Fritz Erich
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 59 Nr. 4 (2010): Ökumenische Rundschau, Band 59, Heft 4
Letter to W.H. Prowse from the District Engineer of the Department of Lands, April 8, 1927
Creators: name: Department Of Lands, District Engineer Of
Publisher: name: The University of British Columbia
Year: 2017

description: Letter to W.H. Prowse from the District Engineer of the Department of Lands, April 8, 1927, regarding the recommendations of the committee in connection with the By-Pass works.
The Impact of Outflows driven by Active Galactic Nuclei on Metals in and around Galaxies
Creators: name: Choi, Ena
name: Brennan, Ryan
name: Somerville, Rachel S.
name: Ostriker, Jeremiah P.
name: Hirschmann, Michaela
name: Naab, Thorsten
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Metals in the hot gaseous halos of galaxies encode the history of star formation as well as the feedback processes that eject metals from the galaxies. X-ray observations suggest that massive galaxies have extended distributions of metals in their gas halos. We present predictions for the metal properties of massive galaxies and their gaseous halos from recent high resolution zoom-in simulations that include mechanical and radiation driven feedback from Active Galactic Nuclei (AGN). In these simulations, AGN launch high-velocity outflows, mimicking observed broad absorption line winds. By comparing two sets of simulations with and without AGN feedback, we show that our prescription for AGN feedback is capable of driving winds and enriching halo gas `inside-out' by spreading centrally enriched metals to the outskirts of galaxies, into the halo and beyond. The metal (iron) profiles of halos simulated with AGN feedback have a flatter slope than those without AGN feedback, consistent with recent X-ray observations. The predicted gas iron abundance of group scale galaxies simulated with AGN feedback is $Z_{\rm Fe} = 0.23$ $Z_{\rm Fe,\odot}$ at $0.5 r_{500}$, which is 2.5 times higher than that in simulations without AGN feedback. In these simulations, AGN winds are also important for the metal enrichment of the intergalactic medium, as the vast majority of metals ejected from the galaxy by AGN-driven winds end up beyond the halo virial radius.
description: Accepted for publication in ApJ. 16 pages, 9 figures. Key figures are 8 & 9
Vibrational detection and control of spin in mixed-valence molecular transistors
Creators: name: Reckermann, F.
name: Leijnse, M.
name: Wegewijs, M. R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate electron transport through a mixed-valence molecular complex in which an excess electron can tunnel between hetero-valent transition metal ions, each having a fixed localized spin. We show that in this class of molecules the interplay of the spins and the vibrational breathing modes of the ionic ligand-shells allows the total molecular spin to be detected as well as controlled by nonequilibrium transport. Due to a spin-dependent pseudo Jahn-Teller effect electronic transitions with different spin values can be distinguished by their vibronic conductance side peaks, without using an external magnetic field. Conversely, we show that the spin state of the entire molecule can also be controlled via the nonequilibrium quantized molecular vibrations due to a vibration-induced spin-blockade.
description: 6 pages, 3 figures
Termination and Confluence of Higher-Order Rewrite Systems
Creators: name: Blanqui, Frédéric
Publisher: name: arXiv
Year: 2006
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: In the last twenty years, several approaches to higher-order rewriting have been proposed, among which Klop's Combinatory Rewrite Systems (CRSs), Nipkow's Higher-order Rewrite Systems (HRSs) and Jouannaud and Okada's higher-order algebraic specification languages, of which only the last one considers typed terms. The later approach has been extended by Jouannaud, Okada and the present author into Inductive Data Type Systems (IDTSs). In this paper, we extend IDTSs with the CRS higher-order pattern-matching mechanism, resulting in simply-typed CRSs. Then, we show how the termination criterion developed for IDTSs with first-order pattern-matching, called the General Schema, can be extended so as to prove the strong normalization of IDTSs with higher-order pattern-matching. Next, we compare the unified approach with HRSs. We first prove that the extended General Schema can also be applied to HRSs. Second, we show how Nipkow's higher-order critical pair analysis technique for proving local confluence can be applied to IDTSs.
Inter-Quark Potentials in Baryons and Multi-Quark Systems in QCD
Creators: name: Suganuma, H.
name: Yamamoto, A.
name: Sakumichi, N.
name: Takahashi, T. T.
name: Iida, H.
name: Okiharu, F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We perform the first studies of various inter-quark potentials in SU(3)$_{\rm c}$ lattice QCD. From the accurate lattice calculation for more than 300 different patterns of three-quark (3Q) systems, we find that the static 3Q potential $V_{\rm 3Q}$ is well described by Y-Ansatz, i.e., the Coulomb plus Y-type linear potential. Quark confinement mechanism in baryons is also investigated in maximally-Abelian projected QCD. We next study the multi-quark potentials $V_{n{\rm Q}}$ ($n$=4,5) in SU(3)$_{\rm c}$ lattice QCD, and find that they are well described by the one-gluon-exchange Coulomb plus multi-Y type linear potential, which supports the flux-tube picture even for the multi-quarks. Finally, we study the heavy-heavy-light quark (QQq) potential both in lattice QCD and in a lattice-QCD-based quark model.
description: Invited talk at the international Conference on Chiral Symmetry in Hadron and Nuclear Physics (Chiral07) November 13-16, 2007, Osaka University, Japan
Schrödinger's problem with cats: measurements and states in the Groupoid Picture of Quantum Mechanics
Creators: name: Ciaglia, Florio M.
name: Di Cosmo, Fabio
name: Ibort, Alberto
name: Marmo, Giuseppe
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Schrödinger's famous Gedankenexperiment involving a cat is used as a motivation to discuss the evolution of states of the composition of classical and quantum systems in the groupoid formalism for physical theories introduced recently. It is shown that the notion of classical system, in the sense of Birkhoff and von Neumann, is equivalent, in the case of systems with a countable number of outputs, to a totally disconnected groupoid with Abelian von Neumann algebra. In accordance with Raggio's theorem, the impossibility of evolving the product state of a composite system made up of a classical and a quantum one into an entangled state by means of a unitary evolution which is internal to the composite system itself is proved in the groupoid formalism.
description: 24 pages. A slightly different version this work will has appeared in Entropy. The main difference is that in the version published in Entropy no mention is made of Schr\"{o}dinger's cat Gedankenexperiment. Comments and suggestions are more than welcome!
Definitions by Rewriting in the Calculus of Constructions
Creators: name: Blanqui, Frédéric
Publisher: name: arXiv
Year: 2006
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: The main novelty of this paper is to consider an extension of the Calculus of Constructions where predicates can be defined with a general form of rewrite rules. We prove the strong normalization of the reduction relation generated by the beta-rule and the user-defined rules under some general syntactic conditions including confluence. As examples, we show that two important systems satisfy these conditions: a sub-system of the Calculus of Inductive Constructions which is the basis of the proof assistant Coq, and the Natural Deduction Modulo a large class of equational theories.
description: Best student paper (Kleene Award)
Re-elicitation of the Dug-from-the-Ground story as transcribed by Jeremiah Curtin
Creators: name: Parker, Verdena
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio files VP-100814-02 and VP-100814-03: Re-elicitation of a version of the Xa:xowilwa:tł' (Dug-from-the-Ground) story found in Jeremiah Curtin's field notes (National Anthropological Archvies MS 2063), page 2 of 3 (VP-100814-02) and page 3 of 3 (VP-100814-03).
Application of the Uniformized Mittag-Leffler Expansion to $Λ(1405)$
Creators: name: Yamada, Wren
name: Morimatsu, Osamu
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study the pole properties of $Λ(1405)$ in a model-independent manner by applying the Uniformized Mittag-Leffler expansion proposed in our previous paper. The resonant energy, width and residues are determined by expanding the observable as a sum of resonant-pole pairs under an appropriate parameterization which expresses the observable to be single-valued, and fitting it to experimental data of the invariant-mass distribution of $π^+Σ^-$, $π^-Σ^+$, $π^0Σ^0$ final states in the reaction, $γp \rightarrow K^+ πΣ$, and the elastic and inelastic cross section, $K^-p\to K^-p$, $\bar{K}^0n$, $π^+Σ^-$, $π^-Σ^+$. As we gradually increase the number of pairs from one to three, the first pair converges while the second and third pairs emerge further and further away from the first pair, implying that the Uniformized Mittag-Leffler expansion with three pairs is almost convergent in the vicinity of the $Λ(1405)$. The broad peak structure between the $πΣ$ and $\bar{K} N$ thresholds regarded to be $Λ(1405)$ is explained by a single pair with a resonant energy of 1420 $\pm$ 1 MeV, and a half width of 48 $\pm$ 2 MeV, which is consistent with the single-pole picture of $Λ(1405)$. We conclude that the Uniformized Mittag-Leffler expansion turns out to be a very powerful method to obtain resonance energy, width and residues from the near-threshold spectrum.
description: 22 pages, 11 figures
Controlling subluminal to superluminal behavior of group velocity in an f-deformed Bose-Einstein condensate beyond the rotating wave approximation
Creators: name: Haghshenasfard, Z.
name: Soltanolkotabi, M.
name: Naderi, M. H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this paper, we investigate tunable control of the group velocity of a weak probe field propagating through an f-deformed Bose-Einstein condensate of three-level atoms beyond the rotating wave approximation. For this purpose, we use an f- deformed generalization of an effective two-level quantum model of the three-level configuration without the rotating wave approximation in which the Gardiners phonon operators for Bose-Einstein condensate are deformed by an operator- valued function,f(n), of the particle- number operator n . Corrections produced by the counter- rotating terms appear in the first order as an intensity- dependent detuning and in the second order as an intensity- dependent atom-field coupling. We consider the collisions between the atoms as a special kind of f- deformation where the collision rate k is regarded as the deformation parameter. We demonstrate the enhanced effect of subluminal and superluminal propagation based on electromagnetically induced transparency and electromagnetically induced absorption, respectively. In particular, we find that (i) the absorptive and dispersive properties of the deformed condensate can be controlled effectively in the absence of the rotating wave approximation by changing the deformation parameter k, the total number of atoms N and the counter- rotating terms parameter, (ii) by increasing the values of k, 1/N and the counter- rotating terms parameter, the group velocity of the probe pulse changes, from subluminal to superluminal and (iii) beyond the rotating wave approximation, the subluminal and superluminal behaviors of the probe field are enhanced.
description: 44pages, 22 figures
First observation of magnetic flux rope inside electron diffusion region
Creators: name: Chen, Z. Z.
name: Fu, H. S.
name: Wang, Z.
name: Guo, Z. Z.
name: Xu, Y.
name: Liu, C. M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Space Physics (physics.space-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Magnrtic flux ropes (MFRs) play a crucial role during magnetic reconnection. They are believed to be primarily generated by tearing mode instabilities in the electron diffusion region (EDR). However, they have never been observed inside the EDR. Here, we present the first observation of an MFR inside an EDR. The bifurcated non-force-free MFR, with a width of 27.5de in the L direction and 4.8de in the N direction, was moving away from the X-line. Inside the MFR, strong energy dissipation was detected. The MFR can modulate the electric field in the EDR. We reconstructed magnetic topology of the electron-scale MFR. Our study promotes understanding of MRFs' initial state and its role in electron-scale processes during magnetic reconnection.
description: 27 pages, 4 figures
Dual-beam intracavity optical trap with all-optical independent axial and radial self-feedback schemes
Creators: name: Kuang, Tengfang
name: Liu, Zijie
name: Xiong, Wei
name: Han, Xiang
name: Xiao, Guangzong
name: Chen, Xinlin
name: Yang, Kaiyong
name: Luo, Hui
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Instrumentation and Detectors (physics.ins-det)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Recently single-beam intracavity optical tweezers have been reported and achieved orders-of-magnitude higher confinement than standard optical tweezers. However, there is only one feedback loop between the trapped particle's three-dimensional position and the scattering loss of the intracavity laser. That leads to the coupling effect between the particle's radial and axial motion, and aggravates the axial confinement efficiency. Here, we present and demonstrate the dual-beam intracavity optical trap enabling independent radial and axial self-feedback control of the trapped particle, through offsetting the foci of the clockwise and counter-clockwise beams. We have achieved the axial confinement efficiency of 1.6*10^(-4) mW^(-1) experimentally at very low numerical aperture (NA=0.25), which is the highest axial confinement efficiency of the optical trap to date, to the best of our knowledge. The dual-beam intracavity optical trap will significantly expand the range of applications in the further studies of biology and physics, especially for a sample that is extremely sensitive to heat.
description: 5 figures
Doubly heavy quark baryon spectroscopy and semileptonic decay
Creators: name: Albertus, C.
name: Hernandez, E.
name: Nieves, J.
name: Verde-Velasco, J. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Working in the framework of a nonrelativistic quark model we evaluate the spectra and semileptonic decay widths for the ground state of doubly heavy $Ξ$ and $Ω$ baryons. We solve the three-body problem using a variational ansatz made possible by the constraints imposed by heavy quark spin symmetry. In order to check the dependence of our resultson the inter-quark interaction we have used five different quarkquark potentials which include Coulomb and hyperfine terms coming fromone-gluon exchange, plus a confining term. Our results for the spectra are in good agreement with a previous calculation done using a Faddeev approach. For the semileptonic decay our results for the total decay widths are in a good agreement with the ones obtained within a relativistic quark model in the quark-diquark approximation.
description: Talk given at the IVth International Conference on Quarks an Nuclear Physics (QNP06), Madrid, June 5th-10th 2006
A simplified model of jet power from active galactic nuclei
Creators: name: Li, Yang
name: Wang, Ding-Xiong
name: Gan, Zhao-Ming
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Aims. A simplified model of jet power from active galactic nuclei is proposed in which the relationship between jet power and disk luminosity is discussed by combining disk accretion with two mechanisms of extracting energy magnetically from a black hole accretion disk, i.e., the Blandford-Payne (BP) and the Blandford-Znajek (BZ) processes. Methods. By including the BP process into the conservation laws of mass, angular momentum and energy, we derive the expressions of the BP power and disk luminosity, and the jet power is regarded as the sum of the BZ and BP powers. Results. We find that the disk radiation flux and luminosity decrease because a fraction of the accretion energy is channelled into the outflow/jet in the BP process. It is found that the dominant cooling mode of the accretion disk is determined mainly by how the poloidal magnetic field decreases with the cylindrical radius of the jet. By using the parameter space we found, which consists of the black hole spin and the self-similar index of the configuration of the poloidal magnetic field frozen in the disk, we were able to compare the relative importance of the following quantities related to the jet production: (1) the BP power versus the disk luminosity, (2) the BP power versus the BZ power, and (3) the jet power versus the disk luminosity. In addition, we fit the jet power and broad-line region luminosity of 11 flat-spectrum radio quasars (FSRQs) and 17 steep-spectrum radio quasars (SSRQs) based on our model.
description: accepted by A&A
The strange case of the transient HBL blazar 4FGL J1544.3-0649
Creators: name: Sahakyan, N.
name: Giommi, P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a multifrequency study of the transient $γ$-ray source 4FGL J1544.3-0649, a blazar that exhibited a remarkable behaviour raising from the state of an anonymous mid-intensity radio source, never detected at high energies, to that of one of the brightest extreme blazars in the X-ray and $γ$-ray sky. Our analysis shows that the averaged $γ$-ray spectrum is well described by a powerlaw with a photon index of $1.87\pm0.04$, while the flux above 100 MeV is $(8.0\pm0.9)\times10^{-9}\:{\rm photon\: cm^{-2}\: s^{-1}}$, which increases during the active state of the source. The X-ray flux and spectral slope are both highly variable, with the highest 2-10 keV flux reaching $(1.28\pm0.05)\times10^{-10}\:{\rm erg\:cm^{-2}\:s^{-1}}$. On several observations the X-ray spectrum hardened to the point implying as SED peak moving to energies larger than 10 keV. As in many extreme blazars the broadband spectral energy distribution can be described by a homogeneous one-zone synchrotron-self-Compton leptonic model. We briefly discuss the potential implications for high-energy multi-messenger astrophysics in case the dual behaviour shown by 4FGL J1544.3-0649 does not represent an isolated case, but rather a manifestation of a so far unnoticed relatively common phenomenon.
description: submitted to MNRAS
Simulations of the Nonlinear Helmholtz Equation: Arrest of Beam Collapse, Nonparaxial Solitons, and Counter-Propagating Beams
Creators: name: Baruch, Guy
name: Fibich, Gadi
name: Tsynkov, Semyon V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Optics (physics.optics)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We solve the (2+1)D nonlinear Helmholtz equation (NLH) for input beams that collapse in the simpler NLS model. Thereby, we provide the first ever numerical evidence that nonparaxiality and backscattering can arrest the collapse. We also solve the (1+1)D NLH and show that solitons with radius of only half the wavelength can propagate over forty diffraction lengths with no distortions. In both cases we calculate the backscattered field, which has not been done previously. Finally, we compute the dynamics of counter-propagating solitons using the NLH model, which is more comprehensive than the previously used coupled NLS model.
description: 6 pages, 6 figures, Letter
Rough translation of file 025_B (collection LA 256)
Creators: name: Parker, Verdena
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio file VP-100814-01: Rough translation (minute-by-minute) of file 025_B (tape 025, side B) from LA 256 (collection of recordings given to the Berkeley Language Center by Verdena), from 15:02 to 31:02; no transcription in this session, translation only. Due to re-numbering, tape 025_B has been assigned to the CLA item number LA256.025, audio file LA256.025B.
Energy Supply for Heating the Slow Solar Wind Observed by Parker Solar Probe between 0.17 and 0.7 au
Creators: name: Wu, Honghong
name: Tu, Chuanyi
name: Wang, Xin
name: He, Jiansen
name: Yang, Liping
Publisher: name: arXiv
Year: 2020
Subjects: subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Energy supply sources for the heating process in the slow solar wind remain unknown. The Parker Solar Probe (PSP) mission provides a good opportunity to study this issue. Recently, PSP observations have found that the slow solar wind experiences stronger heating inside 0.24 au. Here for the first time we measure in the slow solar wind the radial gradient of the low-frequency breaks on the magnetic trace power spectra and evaluate the associated energy supply rate. We find that the energy supply rate is consistent with the observed perpendicular heating rate calculated based on the gradient of the magnetic moment. Based on this finding, one could explain why the slow solar wind is strongly heated inside 0.25 au but expands nearly adiabatically outside 0.25 au. This finding supports the concept that the energy added from the energy-containing range is transferred by an energy cascade process to the dissipation range, and then dissipates to heat the slow solar wind. The related issues for further study are discussed.
description: 6 pages, 4 figures, published by The Astrophysical Journal Letters
Spin relaxation in an InAs quantum dot in the presence of terahertz driving fields
Creators: name: Jiang, J. H.
name: Wu, M. W.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The spin relaxation in a 1D InAs quantum dot with the Rashba spin-orbit coupling under driving THz magnetic fields is investigated by developing the kinetic equation with the help of the Floquet-Markov theory, which is generalized to the system with the spin-orbit coupling, to include both the strong driving field and the electron-phonon scattering. The spin relaxation time can be effectively prolonged or shortened by the terahertz magnetic field depending on the frequency and strength of the terahertz magnetic field. The effect can be understood as the sideband-modulated spin-phonon scattering. This offers an additional way to manipulate the spin relaxation time.
description: 8 pages, 1 figure, to be published in PRB
Feynman diagrams and minimal models for operadic algebras
Creators: name: Chuang, Joseph
name: Lazarev, Andrey
Publisher: name: arXiv
Year: 2008
Subjects: subject: Algebraic Topology (math.AT)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: 18D50, 57T30, 81T18, 16E45

description: We construct an explicit minimal model for an algebra over the cobar-construction of a differential graded operad. The structure maps of this minimal model are expressed in terms of sums over decorated trees. We introduce the appropriate notion of a homotopy equivalence of operadic algebras and show that our minimal model is homotopy equivalent to the original algebra. All this generalizes and gives a conceptual explanation of well-known results for A-infinity algebras. Further, we show that these results carry over to the case of algebras over modular operads; the sums over trees get replaced by sums over general Feynman graphs. As a by-product of our work we prove gauge-independence of Kontsevich's `dual construction' producing graph cohomology classes from contractible differential graded Frobenius algebras.
description: 18 pages
On two- and three-body descriptions of hybrid mesons
Creators: name: Buisseret, Fabien
name: Semay, Claude
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: Hybrid mesons are exotic mesons in which the color field is not in its ground state. Their understanding deserves interest from a theoretical point of view, because it is intimately related to nonperturbative aspects of QCD. In this work, we analyze and compare two different descriptions of hybrid mesons, namely a two-body $q\bar q$ system with an excited string, or a three-body $q\bar q g$ system. In particular, we show that the constituent gluon approach is equivalent to an effective excited string in the heavy hybrid sector. Instead of a numerical resolution, we use the auxiliary field technique. It allows to find simplified analytical mass spectra and wave functions, and still leads to reliable qualitative predictions. We also investigate the light hybrid sector, and found a mass for the lightest hybrid meson which is in satisfactory agreement with lattice QCD and other effective models.
description: 2 figures
Classical and quantal aspects of Minkowski's four-momentum in analog gravity
Creators: name: Brevik, Iver
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The electrodynamic theory of continuous media is probably the most convenient platform when trying to construct analog gravity theories. Quite naturally, this topic has gained considerable interest. One peculiar but not so very known feature in this context is the unconventional behavior of radiation energy and momentum in cases where superluminal fluid velocities are encountered, what, as known, is a major ingredient in analog gravity theories. These peculiar features are intimately connected with the spacelike character of Minkowski's four-momentum in electrodynamics. Here, we first consider an artificial model in which a Kerr-induced superluminal region is created in the right-hand region ($z>0$) in a left-moving, originally subluminal, fluid. We analyze the behavior of energy density, Poynting vector, and momentum density, and calculate the force on the artificial black hole horizon. Also, we delve into quantal aspects, looking for eventual production of particles associated with the sudden creation of the horizon, finding, however, that no particles are predicted to occur. The present paper continues a previous investigation by the author on the same topic, in Phys. Rev. A {\bf 100}, 032109 (2019). The subject as such is closely related to the famous Abraham-Minkowski problem.
description: 13 pages, no figures. To appear in Phys. Rev. A
physiCal: A physical approach to the marginalization of LIGO calibration uncertainties
Creators: name: Vitale, Salvatore
name: Haster, Carl-Johan
name: Sun, Ling
name: Farr, Ben
name: Goetz, Evan
name: Kissel, Jeff
name: Cahillane, Craig
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The data from ground based gravitational-wave detectors such as Advanced LIGO and Virgo must be calibrated to convert the digital output of photodetectors into a relative displacement of the test masses in the detectors, producing the quantity of interest for inference of astrophysical gravitational wave sources. Both statistical uncertainties and systematic errors are associated with the calibration process, which would in turn affect the analysis of detected sources, if not accounted for. Currently, source characterization algorithms either entirely neglect the possibility of calibration uncertainties or account for them in a way that does not use knowledge of the calibration process itself. We present physiCal, a new approach to account for calibration errors during the source characterization step, which directly uses all the information available about the instrument calibration process. Rather than modeling the overall detector's response function, we consider the individual components that contribute to the response. We implement this method and apply it to the compact binaries detected by LIGO and Virgo during the second observation run, as well as to simulated binary neutron stars for which the sky position and distance are known exactly. We find that the physiCal model performs as well as the method currently used within the LIGO-Virgo collaboration, but additionally it enables improving the measurement of specific components of the instrument control through astrophysical calibration.
description: 10 pages, 4 figures
Fragmentation of Spinning Branes
Creators: name: Yamada, Daiske
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The near-horizon geometries of the spinning D3-, M2- and M5-branes are examined by the probes immersed in a co-rotating frame. It is found that the geometries become unstable at critical values of the spin angular velocity by emitting the branes. We show that this instability corresponds to the metastability of the black hole systems and different from the known (local) thermodynamic instability. For the D3 case, the instability found here is in complete agreement with the known metastability of the N=4 super-Yang-Mills theory with R-symmetry chemical potentials.
description: 16 pages + appendices; v2 is the published version with no essential change from v1 but a reference added
Role of intercellular adhesion molecule 2(ICAM-2) in the murine immune system
Creators: name: Carpenito, Carmine
Publisher: name: University of British Columbia
Year: 2009

description: Intercellular adhesion molecule-2 (ICAM-2; CD102) is one of three ligands for the p2 leukocyte integrin LFA-1 (CD11a/CD18). Although ICAM-2 expression is limited to lymphocytes, monocytes, granulocytes, and endothelium, the biological role of ICAM-2 has remained unknown. In this thesis, the murine ICAM-2 cDNA was cloned in order to assist the functional investigation. Sequence analysis of both the cDNA and the genomic clone revealed that ICAM-2 is a member of the immunoglobulin superfamily. The cDNA and antibody were used to examine the role of ICAM-2 in T cell activation and leukocyte transendothelial migration. In order to examine the role of ICAM-2 in antigen presentation to T cells, murine fibroblastic L cells expressing allogeneic class II MHC (l-Ed) were transfected with the ICAM-2 cDNA and tested for the ability to stimulate splenic T cells. The expression of ICAM-2 significantly increased the stimulation of T cells in an LFA-1-dependent manner. The increased T cell response was also observed when the class II MHC and ICAM-2 were expressed in separate cells combined together. This indicated that ICAM-2 is actually transmitting a costimulatory signal rather than merely enhancing T cell adhesion to the antigen presenting cell. T cells stimulated with ICAM-2-transfected L cells expressing the class II MHC were able to respond to an allogeneic secondary stimulation. In contrast, T cells stimulated with L cells expressing only the class II MHC were not able to respond to allogeneic stimulation in the secondary response. These results indicated that ICAM-2 may provide a necessary costimulatory signal to the T cell that is required for the aversion of an anergic state. Endothelial cells transfected with the ICAM-2 cDNA were examined for the ability to assist leukocyte migration. A system was set up in which transendothelial migration could be easily quantitated. It was found that a lymphocytic cell line and bone marrow neutrophils were able to utilize ICAM-2 for the migratory process without destroying the endothelial monolayer. These results demonstrate that ICAM-2 is able to play a role in two physiological processes that are of central importance to the normal function of the immune system.