cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Light lepton portal dark matter meets the LHC
Creators: name: Iguro, Syuhei
name: Okawa, Shohei
name: Omura, Yuji
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We examine the sensitivity of the Large Hadron Collider (LHC) to light lepton portal dark matter with its mass below 10$\,$GeV. The model features an extra doublet scalar field and singlet Dirac dark matter, which have Yukawa interactions with left-handed leptons. To correctly produce the dark matter abundance via the thermal freeze-out, a large mass splitting among the extra scalars is required, thus providing a light neutral scalar below ${\cal O}(10)$GeV and heavy neutral and charged scalars at the electroweak scale. In this paper, we focus on the electroweak pair-production of the extra scalars with subsequent model-specific scalar decays and evaluate the current constraints with the LHC Run$\,$2 data and the discovery potential at the High Luminosity LHC (HL-LHC). It turns out that a large part of the theoretically allowed parameter space can be tested at the HL-LHC by taking into account complementarity between slepton searches and mono-$Z$ plus missing transverse energy search. We also discuss same-sign charged scalar production as a unique prediction of the model, and the implication of the collider searches in the thermal dark matter scenario.
description: 31 pages, 7 figures
Level spacing statistics and spectral correlations in the diffuse van der Waals clusters
Creators: name: Haldar, Sudip Kumar
name: Chakrabarti, Barnali
name: Chavda, N. D.
name: Das, T. K.
name: Canuto, S.
name: Kota, V. K. B.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a statistical analysis of eigenenergies and discuss several measures of spectral fluctuations and spectral correlations for the van der Waals clusters of different sizes. We show that the clusters become more and more complex with increase in cluster size. We study nearest-neighbour level spacing distribution $P(s)$, the level number variance $Σ^2(L)$, and the Dyson-Mehta $Δ_3-$statistics for various cluster sizes. For large clusters we find that although the Bohigas-Giannoni-Schmit (BGS) conjecture seems to be valid, it does not exhibit true signatures of quantum chaos. However contrasting conjecture of Berry and Tabor is observed with smaller cluster size. For small number of bosons, we observe the existence of large number of quasi-degenerate states in low-lying excitation which exhibits the Shnirelman peak in $P(s)$ distribution. We also find a narrow region of intermediate spectrum which can be described by semi-Poisson statistics whereas the higher levels are regular and exhibit Poisson statistics. These observations are further supported by the analysis of the distribution of the ratio of consecutive level spacings $P(r)$ which is independent of unfolding procedure and thereby provides a tool for more transparent comparison with experimental findings than $P(s)$. Thus our detail numerical study clearly shows that the van der Waals clusters become more correlated with the increase in cluster size.
High performance of carbon nanotube refrigerators over a large temperature span
Creators: name: Silva, Tatiana Naomi Yamamoto
name: Fonseca, Alexandre F.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Compression of greenhouse gases still dominates the market of refrigeration devices. Although well stablished and efficient, this technology is neither safe for the environment nor able to be scaled down to nanoscale. Solid-state cooling technologies are being developed to overcome these limitations, including studies at nanoscale. Among them, the so-called elastocaloric effect (eC) consists of the thermal response, $ΔT$, of a material under strain deformation. In this work, fully atomistic molecular dynamics simulations of the eC in carbon nanotubes (CNTs) are presented over a large temperature span. The efficiency of the CNTs as solid refrigerators is investigated by simulating their eC in a model of refrigerator machine running under Otto-like thermodynamic cycles (two adiabatic expansion/contraction plus two isochoric heat exchange processes) operating at temperatures, $T_\mbox{O}$, ranging from 300 to 2000 K. The coefficient-of-performance (COP), defined as the ratio of heat removed from the cold region to the total work performed by the system per thermodynamic cycle, is calculated for each value of $T_\mbox{O}$. Our results show a non-linear dependence of $ΔT$ on $T_\mbox{O}$, reaching a minimum value of about 30 K for $T_\mbox{O}$ between 500 and 600 K, then growing and converging to a linear dependence on $T_\mbox{O}$ for large temperatures. The COP of CNTs is shown to remain about the same and approximately equal to 8. These results are shown to be weakly depend on CNT diameter and chirality but not on length. The isothermal entropy change of the CNTs due to the eC is also estimated and shown to depend non-linearly on $T_\mbox{O}$ values. These results predict that CNTs can be considered versatile nanoscale solid refrigerators able to efficiently work over a large temperature span.
description: 4 figures, 5 tables plus 4 figures in suppl. materials
Nongeneric J-holomorphic curves and singular inflation
Creators: name: McDuff, Dusa
name: Opshtein, Emmanuel
Publisher: name: arXiv
Year: 2013
Subjects: subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics

description: This paper investigates the geometry of a symplectic 4-manifold $(M,\om)$ relative to a J-holomorphic normal crossing divisor S. Extending work by Biran (in Invent. Math. 1999), we give conditions under which a homology class $A\in H_2(M;\Z)$ with nontrivial Gromov invariant has an embedded J-holomorphic representative for some S-compatible J. This holds for example if the class $A$ can be represented by an embedded sphere, or if the components of S are spheres with self-intersection -2. We also show that inflation relative to S is always possible, a result that allows one to calculate the relative symplectic cone. It also has important applications to various embedding problems, for example of ellipsoids or Lagrangian submanifolds.
description: 45 pages. v2: In this version, unnecessary assumptions on the singular set are removed, and a more detailed discussion of 1-parameter families is provided
Antisymmetric tensor Z_p gauge symmetries in field theory and string theory
Creators: name: Berasaluce-González, Mikel
name: Ramírez, Guillermo
name: Uranga, Angel M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider discrete gauge symmetries in D dimensions arising as remnants of broken continuous gauge symmetries carried by general antisymmetric tensor fields, rather than by standard 1-forms. The lagrangian for such a general ${\bf Z}_p$ gauge theory can be described in terms of a $r$-form gauge field made massive by a $(r-1)$-form, or other dual realizations, that we also discuss. The theory contains charged topological defects of different dimensionalities, generalizing the familiar charged particles and strings in D=4. We describe realizations in string theory compactifications with torsion cycles, or with background field strength fluxes. We also provide examples of non-abelian discrete groups, for which the group elements are associated with charged objects of different dimensionality.
description: 16 pages; v2: references added and typos fixed
Probing the QCD phase diagram with HBT femtoscopy
Creators: name: Lökös, Sándor
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Intensity interferometry originates from the field of radio astronomy on the trace of Robert Hanbury Brown and Richard Quincy Twiss. In high energy physics, the phenomena was discovered by Goldhaber, Goldhaber, Lee and Pais. In radio astronomy the method is exceeded by more modern approaches but in high energy physics, the measurements of Hanbury Brown-Twiss (HBT) or Goldhaber-Goldhaber-Lee-Pais (GGLP) type of correlations are important tools to access the spatio-temporal properties of the matter under extreme conditions on subatomic scales. In this paper, I review recent experimental results from energies of the Relativistic Heavy Ion Collider (RHIC) to the Large Hadron Collider (LHC) and discuss their possible implication on the equation of state of the QCD matter.
description: 8 pages, 4 figures, presented at Epiphany conference 2022, Krakow, the work was supported by OTKA K138136 grant of Hungary
COOEE bitumen. Chemical aging
Creators: name: Lemarchand, Claire A.
name: Schrøder, Thomas B.
name: Dyre, Jeppe C.
name: Hansen, Jesper S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We study chemical aging in "COOEE bitumen" using molecular dynamic simulations. This model bitumen is composed of four realistic molecule types: saturated hydrocarbon, resinous oil, resin, and asphaltene. The aging reaction is modelled by the chemical reaction: "2 resins $\rightarrow$ 1 asphaltene". Molecular dynamic simulations of four bitumen compositions, obtained by a repeated application of the aging reaction, are performed. The stress autocorrelation function, the fluid structure, the rotational dynamics of the plane aromatic molecules, and the diffusivity of each molecule, are determined for the four different compositions. The aging reaction causes a significant dynamics slowdown, which is correlated to the aggregation of asphaltene molecules in larger and dynamically slower nanoaggregates. Finally, a detailed description of the role of each molecule types in the aggregation and aging processes is given.
description: 36 pages, 15 figures
QED Effects at Grazing Incidence on Solid-State-Targets
Creators: name: Filipovic, Marko
name: Pukhov, Alexander
Publisher: name: arXiv
Year: 2022
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: New laser facilities will reach intensities of $10^{23} \textrm{W cm}^{-2}$. This advance enables novel experimental setups in the study of laser-plasma interaction. In these setups with extreme fields quantum electrodynamic (QED) effects like photon emission via non-linear Compton scattering and Breit-Wheeler pair production become important. We study high-intensity lasers grazing the surface of a solid-state target by two-dimensional particle-in-cell simulations with QED effects included. The two laser beams collide at the target surface at a grazing angle. Due to the fields near the target surface electrons are extracted and accelerated. Finally, the extracted electrons collide with the counter-propagating laser, which triggers many QED effects and leads to a QED cascade under a sufficient laser intensity. Here, the processes are studied for various laser intensities and angles of incidence and finally compared to a seeded vacuum cascade. Our results show that the proposed target can yield many order of magnitude more secondary particles and develop a QED cascade at lower laser intensities than the seeded vacuum alone.
description: 8 pages, 6 figures, regular article, This article has been submitted to "The European Physical Journal D" (EPJ D) under the Topical Issue: High Field QED Physics; fixed typos in abstract and latex typo in eqation 4, added reference in section 1
Academy program has started, first events have been organized (NFDI4Earth MS1.4.1)
Creators: name: Gödde, Hildegard
name: Drews, Effi-Laura
name: Kuppler, Jonas
name: Ntageretzis, Konstantin
name: Sauerland, Kristin
name: Wiemer, Gauvain
Publisher: name: NFDI4Earth Community on Zenodo
Year: 2024
Subjects: NFDI4Earth
NFDI4Earth Milestone
NFDI4Earth Task Area 1
NFDI4Earth 2Participate
NFDI4Earth Academy

description: The Academy program for the first cohort started with our Kick-Off meeting on December 30th 2022. Till July 2023, we held a virtual lecture series, coffee lectures, a summer school and a Get-together at the NFDI4Earth Plenary in Dresden.   A list of the events with a short description is provided in this document.
description: This work has been funded by the German Research Foundation (DFG) through the project NFDI4Earth (DFG project no.460036893, https://www.nfdi4earth.de/) within the German National Research Data Infrastructure (NFDI, https://www.nfdi.de/).
Few nucleons scattering in pionless effective field theory
Creators: name: Schäfer, Martin
name: Bazak, Betzalel
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We present a comprehensive theoretical study of low-energy few nucleon scattering for systems with $A\leq 4$. To this end, we utilize pionless effective field theory, which we employ at next-to-leading order. We show that at this level the theory yields accurate predictions for the low-energy scattering parameters in all studied channels. These predictions are on par with the best experimental evaluations and the available theoretical calculations. We confirm the recent observation that a four-body force is needed at next-to-leading-order and find that for nuclear systems it only appears in a single spin-isospin channel.
Nonsymmorphic chiral symmetry and solitons in the Rice-Mele model
Creators: name: Allen, Rebecca E. J.
name: Gibbons, Holly V.
name: Sherlock, Alex M.
name: Stanfield, Harvey R. M.
name: McCann, Edward
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The Rice-Mele model has two topological and spatially-inversion symmetric phases, namely the Su-Schrieffer-Heeger (SSH) phase with alternating hopping only, and the charge-density-wave (CDW) phase with alternating energies only. The chiral symmetry of the SSH phase is robust in position space, so that it is preserved in the presence of the ends of a finite system and of textures in the alternating hopping. However, the chiral symmetry of the CDW wave phase is nonsymmorphic, resulting in a breaking of the bulk topology by an end or a texture in the alternating energies. We consider the presence of solitons (textures in position space separating two degenerate ground states) in finite systems with open boundary conditions. We identify the parameter range under which an atomically-sharp soliton in the CDW phase supports a localized state which lies within the band gap, and we calculate the expectation value $p_y$ of the nonsymmorphic chiral operator for this state, and the soliton electric charge. As the spatial extent of the soliton increases beyond the atomic limit, the energy level approaches zero exponentially quickly or inversely proportionally to the width, depending on microscopic details of the soliton texture. In both cases, the difference of $p_y$ from one is inversely proportional to the soliton width, while the charge is independent of the width. We investigate the robustness of the soliton level in the presence of disorder and sample-to-sample parameter variations, comparing with a single soliton level in the SSH phase with an odd number of sites.
description: 15 pages, 12 figures
Entry-exit functions in fast-slow systems with intersecting eigenvalues
Creators: name: Kaklamanos, Panagiotis
name: Kuehn, Christian
name: Popović, Nikola
name: Sensi, Mattia
Publisher: name: arXiv
Year: 2022
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: We study delayed loss of stability in a class of fast-slow systems with two fast variables and one slow one, where the linearisation of the fast vector field along a one-dimensional critical manifold has two real eigenvalues which intersect before the accumulated contraction and expansion are balanced along any individual eigendirection. That interplay between eigenvalues and eigendirections renders the use of known entry-exit relations unsuitable for calculating the point at which trajectories exit neighbourhoods of the given manifold. We illustrate the various qualitative scenarios that are possible in the class of systems considered here, and we propose novel formulae for the entry-exit functions that underlie the phenomenon of delayed loss of stability therein.
Funisciurus anerythrus
Creators: name: Hoffmann, Robert S.
name: Anderson, Charles G.
Publisher: name: Zenodo
Year: 1993
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Mammalia
Rodentia
Sciuridae
Funisciurus
Funisciurus anerythrus

description: Funisciurus anerythrus (Thomas, 1890). Proc. Zool. Soc. Lond., 1890:447. TYPE LOCALITY: Uganda, "Buguera", S of Lake Albert. DISTRIBUTION: SW Nigeria, Cameroon, Central African Republic, NE Zaire, Uganda; SW Zaire and N Shaba Prov. (Zaire). SYNONYMS: bandarum Thomas, 1915; mystax De Winton, 1898; niapu Allen, 1922; ochrogaster Cabrera and Ruxton, 1926; raptorum Thomas, 1903.
description: Published as part of Robert S. Hoffmann & Charles G. Anderson, 1993, Order Rodentia - Family Sciuridae, pp. 419-465 in Mammal Species of the World (2 nd Edition), Washington and London :Smithsonian Institution Press on page 427, DOI: 10.5281/zenodo.7353130
description: {"references": ["Thomas, O. 1915. List of mammals (exclusive of Ungulata) collected on the Upper Congo by Dr. Christy for the Congo Museum, Tervueren. Annals and Magazine of Natural History, ser. 8, 16: 465 - 481.", "Thomas, O. 1903. Notes on Neotropical mammals of the genera Felis, Hapale, Oryzomys, Akodon, and Ctenomys, with descriptions of new species. Annals and Magazine of Natural History, ser. 7, 12: 234 - 243."]}
Observational constraint on axion dark matter with gravitational waves
Creators: name: Tsutsui, Takuya
name: Nishizawa, Atsushi
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Most matter in the Universe is invisible and unknown, which is called dark matter. A candidate of dark matter is axion, which is an ultra-light particle motivated as a solution for the CP problem. Axions form clouds in a galactic halo, amplify, and delay a part of gravitational waves propagating in the clouds. The Milky Way is surrounded by the dark matter halo composed of a number of axion patches. Thus, the characteristic secondary gravitational waves are always expected right after the reported gravitational-wave signals from compact binary mergers. In this paper, we derive a realistic amplitude of the secondary gravitational waves. Then we search the gravitational waves having the characteristic time delay and duration with a method optimized for them. We find no significant signal. Assuming the axions are dominant component of dark matter, we obtain the constraints on the axion coupling to the parity violating sector of gravity for the mass range, [$1.7 \times 10^{-13}, 8.5 \times 10^{-12}$]$\mathrm{eV}$, which is at most $\sim 10$ times stronger than that from Gravity Probe B.
description: PRD version
Extracting spinon self-energies from two-dimensional coherent spectroscopy
Creators: name: Hart, Oliver
name: Nandkishore, Rahul
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Two-dimensional coherent spectroscopy (2DCS) is a nonlinear spectroscopy technique capable of identifying whether apparent continua in linear response are made out of multiplets of sharp deconfined quasiparticles. This makes it a potent tool for experimental identification of fractionalized phases. Previous discussions have focused on limits where the quasiparticles in question are infinitely long lived. In this manuscript we discuss 2DCS in the regime where the fractionalized quasiparticles can themselves decay. We introduce a powerful path integral based approach, whereby the computation of nonlinear susceptibilities reduces to an efficient exercise in diagrammatic perturbation theory. We apply this method to compute the 2DCS response of the one-dimensional transverse field Ising model, in the presence of integrability-breaking perturbations. We discuss aspects of the self-energy of the fractionalized quasiparticles that may be extracted via 2DCS, such as the momentum-dependent decay rate.
description: 22 pages, 11 figures
A $Q$-polynomial structure associated with the projective geometry $L_N(q)$
Creators: name: Terwilliger, Paul
Publisher: name: arXiv
Year: 2022
Subjects: subject: Combinatorics (math.CO)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: 05E30

description: There is a type of distance-regular graph, said to be $Q$-polynomial. In this paper we investigate a generalized $Q$-polynomial property involving a graph that is not necessarily distance-regular. We give a detailed description of an example associated with the projective geometry $L_N(q)$.
description: 21 pages
Notoxus inbasaliformis Kejval 2011, sp. nov.
Creators: name: Kejval, Zbyněk
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Anthicidae
Notoxus
Notoxus inbasaliformis

description: Notoxus inbasaliformis sp. nov. (Figs. 19, 59) Type locality. India, Assam, North Cachar Hills District, Mount Borail, Jatinga riverside, 25°07′12′′ N, 93°02′06′′ E, 650 m a.s.l. Type material. HOLOTYPE: J, ‘ INDIA: Assam, North #11e Cachar Hills dist. Mt Borail Jatinga River trail 650 m, 22.x.2005, 25°07′12′′ N; 93°02′06′′ E // under stones #11e on river bank leg. G. Cuccodoro & A. Marleta’ (MHNG). PARATYPES: 1 J 3 ♀♀, same data as holotype (MHNG, ZKDC). Additional material examined. NEPAL: KOSI ZONE: 1 ♀, Sankhua Sabha Distr., Arun valley bottom between Hedangna and Num, 950– 100 m, 6–8.vi.1988, J. Martens & W. Schawaller leg. (SMNS). Description. Male (holotype). Body length 3.9 mm. In external characters identical with N. inbasalis (see below). Aedeagus as figured (Fig. 19).  Female. Differing from male by simply rounded elytral apices. Variation. Body length (J ♀) 3.9–4.6 mm. Pronotal horn with 3–4 distinct lobules laterally on each side; apical lobule bilobed to widely unevenly rounded. Differential diagnosis. Notoxus inbasaliformis sp. nov. is undoubtedly very close to N. inbasalis. It can be distinguished from the latter species only by longer median lobe of the aedeagus, with apex distinctly exceeding dorsal plate, and laterally moderately angled parameres (cf. Figs. 19 versus 20, 21). It may externally slightly resemble N. andrewesi from southern India, but differs by its larger size, more robust body, much denser and coarser punctation of the pronotal disc and elytra, and by the morphology of the male aedeagus. Etymology. Composed from inbasalis and suffix - formis (having the shape of); named in reference to the overall similarity with N. inbasalis. Distribution. India: Assam; Nepal. Remarks. An additionally examined female specimen from Nepal bears an identification label ‘ Notoxus andrewesi ’ by G. Uhmann (UHMANN 1990).
description: Published as part of Kejval, Zbyněk, 2011, Taxonomic revision of the Oriental species of Notoxus (Coleoptera: Anthicidae), pp. 627-673 in Acta Entomologica Musei Nationalis Pragae 51 (2) on pages 646-648, DOI: 10.5281/zenodo.5329507
description: {"references": ["PIC M. 1926: Nouveautes diverses. Melanges Exotico-Entomologiques 45: 1 - 32.", "UHMANN G. 1990: Anthicidae aus Nepal III. Entomofauna, Zeitschrift fur Entomologie 11: 333 - 347."]}
Funisciurus bayonii
Creators: name: Hoffmann, Robert S.
name: Anderson, Charles G.
Publisher: name: Zenodo
Year: 1993
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Mammalia
Rodentia
Sciuridae
Funisciurus
Funisciurus bayonii

description: Funisciurus bayonii (Bocage, 1890). J. Sei. Math. Phys. Nat. Lisboa, (2)2:3. TYPE LOCALITY: N Angola, "...du Duque de Bragança... " DISTRIBUTION: NE Angola, SW Zaire.
description: Published as part of Robert S. Hoffmann & Charles G. Anderson, 1993, Order Rodentia - Family Sciuridae, pp. 419-465 in Mammal Species of the World (2 nd Edition), Washington and London :Smithsonian Institution Press on page 427, DOI: 10.5281/zenodo.7353130
Information geometric complexity of entropic motion on curved statistical manifolds
Creators: name: Cafaro, Carlo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: Physical systems behave according to their underlying dynamical equations which, in turn, can be identified from experimental data. Explaining data requires selecting mathematical models that best capture the data regularities. Identifying dynamical equations from the available data and statistical model selection are both very difficult tasks. Motivated by these fundamental links among physical systems, dynamical equations, experimental data and statistical modeling, we discuss in this invited Contribution our information geometric measure of complexity of geodesic paths on curved statistical manifolds underlying the entropic dynamics of classical physical systems described by probability distributions. We also provide several illustrative examples of entropic dynamical models used to infer macroscopic predictions when only partial knowledge of the microscopic nature of the system is available. Finally, we present entropic arguments to briefly address complexity softening effects due to statistical embedding procedures.
description: 10 pages, Invited Contribution for the 12th Joint European Thermodynamics Conference, July 1-5, Brescia, Italy
Low-energy prethermal phase and crossover to thermalization in nonlinear kicked rotors
Creators: name: Martinez, Maxime
name: Larré, Pierre-Élie
name: Delande, Dominique
name: Cherroret, Nicolas
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In the presence of interactions, periodically-driven quantum systems generically thermalize to an infinite-temperature state. Recently, however, it was shown that in random kicked rotors with local interactions, this long-time equilibrium could be strongly delayed by operating in a regime of weakly fluctuating random phases, leading to the emergence of a metastable thermal ensemble. Here we show that when the random kinetic energy is smaller than the interaction energy, this system in fact exhibits a much richer dynamical phase diagram, which includes a low-energy pre-thermal phase characterized by a light-cone spreading of correlations in momentum space. We develop a hydrodynamic theory of this phase and find a very good agreement with exact numerical simulations. We finally explore the full dynamical phase diagram of the system and find that the transition toward full thermalization is characterized by relatively sharp crossovers.
description: 12 pages, 7 figures
Near-infrared light-induced superconducting-like state in underdoped YBa$_2$Cu$_3$O$_y$ studied by $c$-axis terahertz third-harmonic generation
Creators: name: Katsumi, Kota
name: Nishida, Morihiko
name: Kaiser, Stefan
name: Miyasaka, Shigeki
name: Tajima, Setsuko
name: Shimano, Ryo
Publisher: name: arXiv
Year: 2022
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Recent observation of the light-induced superconducting (SC)-like transient response in the $c$-axis optical conductivity far above the SC transition temperature $T_{\mathrm{c}}$ in underdoped YBa$_2$Cu$_3$O$_y$ (YBCO) has attracted great attention in the field of high-$T_{\mathrm{c}}$ superconductors. Since then, various theoretical and experimental studies have been devoted to elucidating its microscopic origin. One prominent fingerprint of the light-induced superconductivity is the emergence of $1/ω$-like spectral behavior in the imaginary part of the optical conductivity in the terahertz (THz) frequency range. However, the spectral profile can also be described by the Drude response of the quasiparticles (QPs) with a substantially low scattering rate. To circumvent this critical ambiguity, we investigated the light-induced nonequilibrium state in an underdoped YBCO sample with $T_{\mathrm{c}}$ of 61 K using the nonlinear THz optical response originating from the SC collective excitation of the ac-driven Josephson current. Upon the near-infrared (NIR) photoexcitation above $T_{\mathrm{c}}$ in the YBCO sample, the $1/ω$-like spectral behavior in the imaginary part of the optical conductivity emerges, consistent with the previous studies. However, the THz third-harmonic generation arising from the ac-driven Josephson current along the $c$-axis was absent in the NIR photoexcited state. These results indicate that the NIR-pump induced state exhibiting the $1/ω$-like response above $T_{\mathrm{c}}$ is distinct from the long-range ordered SC state in equilibrium. Based on these observations, the possible origins of the irregularly coherent charge carrier response along the $c$-axis induced by the photoexcitation are discussed.
description: 36 pages, 15 figures
High Resolution Gamma Ray Detection in a Dual Phase Xenon Time Projection Chamber
Creators: name: Lin, Qing
name: Wei, Yuehuan
name: Bao, Jie
name: Hu, Jie
name: Li, Xinran
name: Lorenzon, Wolfgang
name: Ni, Kaixuan
name: Schubnell, Michael
name: Xiao, Mengjiao
name: Xiao, Xiang
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Dual phase Xenon Time Projection Chambers (XeTPCs) are being used by several experiments as a promising technique for direct detection of dark matter. We report on the design and performance of a small 3-D sensitive dual phase XeTPC. The position resolution is 2 mm in the center of detector, limited by the hole size of the mesh at the proportional scintillation region. An energy resolution of 1.6%(σ /E) for 662 keV gamma rays is achieved by combining the ionization and scintillation signals at a drift field of 0.5 kV/cm. This represents the best energy resolution achieved among liquid xenon detectors. The energy resolution is only slightly dependent on drift field. Better than 2% energy resolution (σ /E) for 662 keV gamma rays can be achieved for drift fields between 100 V/cm and 2 kV/cm. With high position and energy resolutions, a dual phase XeTPC has also potential applications in surveys for neutrinoless double-beta decay and in gamma ray imaging.
GoonDAE: Denoising-Based Driver Assistance for Off-Road Teleoperation
Creators: name: Cho, Younggeol
name: Yun, Hyeonggeun
name: Lee, Jinwon
name: Ha, Arim
name: Yun, Jihyeok
Publisher: name: arXiv
Year: 2022
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences
subject: I.2.9

description: Because of the limitations of autonomous driving technologies, teleoperation is widely used in dangerous environments such as military operations. However, the teleoperated driving performance depends considerably on the driver's skill level. Moreover, unskilled drivers need extensive training time for teleoperations in unusual and harsh environments. To address this problem, we propose a novel denoising-based driver assistance method, namely GoonDAE, for real-time teleoperated off-road driving. The unskilled driver control input is assumed to be the same as the skilled driver control input but with noise. We designed a skip-connected long short-term memory (LSTM)-based denoising autoencoder (DAE) model to assist the unskilled driver control input by denoising. The proposed GoonDAE was trained with skilled driver control input and sensor data collected from our simulated off-road driving environment. To evaluate GoonDAE, we conducted an experiment with unskilled drivers in the simulated environment. The results revealed that the proposed system considerably enhanced driving performance in terms of driving stability.
description: This work has been accepted for publication in IEEE Robotics and Automation Letters. Accepted February 2023
Funisciurus carruthersi Thomas 1906
Creators: name: Hoffmann, Robert S.
name: Anderson, Charles G.
Publisher: name: Zenodo
Year: 1993
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Mammalia
Rodentia
Sciuridae
Funisciurus
Funisciurus carruthersi

description: Funisciurus carruthersi Thomas, 1906. Ann. Mag. Nat. Hist., ser. 7, 18:140. TYPE LOCALITY: Uganda, "Ruwenzori East, 6500’ (1900 m)." DISTRIBUTION: Ruwenzori (S Uganda), Rwanda, Burundi. SYNONYMS: birungensis Gyldenstolpe, 1927; chrysippus Thomas, 1923; tanganyikae Thomas, 1909.
description: Published as part of Robert S. Hoffmann & Charles G. Anderson, 1993, Order Rodentia - Family Sciuridae, pp. 419-465 in Mammal Species of the World (2 nd Edition), Washington and London :Smithsonian Institution Press on page 427, DOI: 10.5281/zenodo.7353130
Anisotropic warm inflation
Creators: name: Kanno, Sugumi
name: Mukuno, Ann
name: Soda, Jiro
name: Ueda, Kazushige
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Anisotropic inflation is a model succeeded in explaining statistical anisotropy. Warm inflation is a model succeeded in providing a mechanism of reheating during inflation. We study anisotropic warm inflation focusing on the cosmic no-hair conjecture. In the anisotropic warm inflation, the condition for making anisotropy survived is clarified. By assuming a constant value for the dissipation ratio, we find exact solutions of power-law anisotropic warm inflation, and investigate the phase space structure of general solutions. It turns out that whether the anisotropy during inflation survives or not depends on the competition of the potential that drive anisotropic inflation against dissipation of an inflaton field. Anisotropic warm inflation will be realized if the decaying process is not efficient.
description: 23 pages, 5 figures
Funisciurus congicus
Creators: name: Hoffmann, Robert S.
name: Anderson, Charles G.
Publisher: name: Zenodo
Year: 1993
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Mammalia
Rodentia
Sciuridae
Funisciurus
Funisciurus congicus

description: Funisciurus congicus (Kuhl, 1820). Beitr. Zool. Vergi. Anat. Abt., 2:66. TYPE LOCALITY: " Congo ". No specific locale given, probably Angola (Hill and Carter, 1941:71). DISTRIBUTION: Zaire, Angola, Namibia. SYNONYMS: damarensis (Roberts, 1938); flavinus Thomas, 1904; interior Thomas, 1916; oenone Thomas, 1926; olivellus Thomas, 1904; poolii (Jentink, 1906); praetextus Wagner, 1843.
description: Published as part of Robert S. Hoffmann & Charles G. Anderson, 1993, Order Rodentia - Family Sciuridae, pp. 419-465 in Mammal Species of the World (2 nd Edition), Washington and London :Smithsonian Institution Press on page 427, DOI: 10.5281/zenodo.7353130
description: {"references": ["Hill, J. E., and T. D. Carter. 1941. The mammals of Angola, Africa. Bulletin of the American Museum of Natural History, 78 (1): 1 - 211.", "Roberts, A. 1938. Descriptions of new forms of mammals. Annals of the Transvaal Museum, 19 (2): 231 - 245."]}
The shortened KK spectrum of IIB supergravity on Y^{p,q}
Creators: name: Ardehali, Arash Arabi
name: Liu, James T.
name: Szepietowski, Phillip
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We examine the shortened KK spectrum of IIB supergravity compactified on Y^{p,q} and conjecture that the spectrum we have obtained is complete. The (untwisted) shortened spectrum on S^5/Z_{2p} and T^{1,1}/Z_p are obtained as special cases when p=q and q=0, respectively. Knowledge of the shortened spectrum allows us to compute the superconformal index of these theories and to find agreement with earlier calculations from the dual field theories. We also employ the shortened spectrum to perform a 1/N^2 test of AdS/CFT by holographically reproducing the difference of the central charges, c-a=p/8, of the dual CFTs.
description: 20 pages; v2: comments added on the results of arXiv:1207.0573 for the superconformal index; v3: the presented shortened spectrum is emphasized to be conjectured, and not proved, to be complete
Funisciurus isabella
Creators: name: Hoffmann, Robert S.
name: Anderson, Charles G.
Publisher: name: Zenodo
Year: 1993
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Mammalia
Rodentia
Sciuridae
Funisciurus
Funisciurus isabella

description: Funisciurus isabella (Gray, 1862). Proc. Zool. Soc. Lond., 1862:180. TYPE LOCALITY: Cameroon, "... from the Camaroon Mountains, 7000 feet (2100 m) above the level of the sea... " DISTRIBUTION: Cameroon, Central African Republic, Congo. SYNONYMS: dubosti Eisentraut, 1969; duchaillui Sanborn, 1953.
description: Published as part of Robert S. Hoffmann & Charles G. Anderson, 1993, Order Rodentia - Family Sciuridae, pp. 419-465 in Mammal Species of the World (2 nd Edition), Washington and London :Smithsonian Institution Press on page 427, DOI: 10.5281/zenodo.7353130
Detection and estimation of the cosmic dipole with the Einstein Telescope and Cosmic Explorer
Creators: name: Mastrogiovanni, S.
name: Bonvin, C.
name: Cusin, G.
name: Foffa, S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: One of the open issues of the standard cosmological model is the value of the cosmic dipole measured from the Cosmic Microwave Background (CMB), as well as from the number count of quasars and radio sources. These measurements are currently in tension, with the number count dipole being 2-5 times larger than expected from CMB measurements. This discrepancy has been pointed out as a possible indication that the cosmological principle is not valid. In this paper, we explore the possibility of detecting and estimating the cosmic dipole with gravitational waves (GWs) from compact binary mergers detected by the future next-generation detectors Einstein Telescope and Cosmic Explorer. We model the expected signal and show that for binary black holes, the dipole amplitude in the number count of detections is independent of the characteristics of the population and provides a systematic-free tool to estimate the observer velocity. We introduce techniques to detect the cosmic dipole from number counting of GW detections and estimate its significance. We show that a GW dipole consistent with the amplitude of the dipole in radio galaxies would be detectable with $>3σ$ significance with a few years of observation ($10^6$ GW detections) and estimated with a $16\%$ precision, while a GW dipole consistent with the CMB one would require at least $10^7$ GW events for a confident detection. We also demonstrate that a total number $N_{\rm tot}$ of GW detections would be able to detect a dipole with amplitude $v_o/c \simeq1/\sqrt{N_{\rm tot}}$.
description: 10 pages, 10 figures. Updated to the published version. We also corrected a bug for Fig.1 and Fig.2 concerning the SNR calculation (missing 2.2 factor). Rest of the paper holds same conclusions
Fellows of second cohort have been recruited; revised Academy program has started (NFDI4Earth MS1.4.2)
Creators: name: Gödde, Hildegard
name: Drews, Effi-Laura
name: Kuppler, Jonas
name: Ntageretzis, Konstantin
name: Sauerland, Kristin
name: Wiemer, Gauvain
Publisher: name: NFDI4Earth Community on Zenodo
Year: 2024
Subjects: NFDI4Earth
NFDI4Earth Milestone
NFDI4Earth Task Area 1
NFDI4Earth 2Participate
NFDI4Earth Academy

description: Our second call for Academy Fellows resulted in 42 applications of early   career scientists from various German universities or non-university research institutions. A selection committee composed of nine Earth System and Data Science experts chose 34 Fellows for our first Academy Cohort in a two-step selection procedure. First, each application was reviewed by five experts according to five scoring categories, including motivation, project ideas, skills and knowledge. Under consideration of the scoring results in step 1, the committee selected the most promising applicants in a panel discussion in step 2.

We are very thankful to the members of our scientific selection committee for their commitment and engagement: Denise Degen (RWTH Aachen), Henryk Dobslaw (GFZ Potsdam), Sabine Grießbach (Jülich Supercomputing Centre), Dominik Hezel (Goethe-Universität Frankfurt), Miguel Mahecha (Universität Leipzig), Tobias Marke (Universität zu Köln), Jannes Münchmeyer (ISTerre Grenoble), Heiko Pälicke (MARUM/Universität Bremen), Anja Rösel (DLR), Timm Schöning (GEOMAR), Josefine Umlauft (ScaDS.AI/Universität Leipzig), Martin Werner (Technische Universität München) and Gerwin Wulf (Universität Bonn).

 The Academy program for the second cohort started with our Kick-Off meeting on June 10^th^ 2024. Till July 2024, we held two cohort calls. A list of the events with a short description is provided below. A description of the complete Academy program can be found on the NFDI4Earth website: https://www.nfdi4earth.de/2participate/academy/academy-program.
description: This work has been funded by the German Research Foundation (DFG) through the project NFDI4Earth (DFG project no.460036893, https://www.nfdi4earth.de/) within the German National Research Data Infrastructure (NFDI, https://www.nfdi.de/).
On gapped phases with a continuous symmetry and boundary operators
Creators: name: Bachmann, Sven
name: Nachtergaele, Bruno
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We discuss the role of compact symmetry groups, G, in the classification of gapped ground state phases of quantum spin systems. We consider two representations of G on infinite subsystems. First, in arbitrary dimensions, we show that the ground state spaces of models within the same G-symmetric phase carry equivalent representations of the group for each finite or infinite sublattice on which they can be defined and on which they remain gapped. This includes infinite systems with boundaries or with non-trivial topologies. Second, for two classes of one-dimensional models, by two different methods, for G=SU(2) in one, and G\subset SU(d), in the other we construct explicitly an `excess spin' operator that implements rotations of half of the infinite chain on the GNS Hilbert space of the ground state of the full chain. Since this operator is constructed as the limit of a sequence of observables, the representation itself is, in principle, experimentally observable. We claim that the corresponding unitary representation of G is closely related to the representation found at the boundary of half-infinite chains. We conclude with determining the precise relation between the two representations for the class of frustration-free models with matrix product ground states.
description: Minor changes and corrections
Lazarus Stars: Numerical investigations of stellar evolution with star-lifting as a life extension strategy
Creators: name: Scoggins, Matthew T.
name: Kipping, David
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The aging and gradual brightening of the Sun will challenge Earth's habitability in the next few billion years. If life exists elsewhere in the Universe, the aging of its host star similarly poses an existential threat. One solution, which we dub a Lazarus star, is for an advanced civilization to remove (or star-lift) mass from their host star at a rate that offsets the increase in luminosity, keeping the flux on the habitable planet(s) constant and extending the lifetime of their star. While this idea has existed since 1985 when it was first proposed by Criswell, numerical investigations of star-lifting have been lacking. Here, we use the stellar evolution code MESA to find mass vs. age and $\dot{M}$ vs. age relations which would hold the flux on surrounding planets constant. We explore initial mass ranging from $0.2{\rm M}_{\odot}$ to $1.2{\rm M}_{\odot}$. For most stars with a mass initially below about $ 0.4 {\rm M}_{\odot}$, we find that star-lifting increases their main-sequence lifetimes up to $500$ Gyr until they approach the hydrogen burning limit and star-lifting is no longer possible. For more massive stars, star-lifting increase main-sequence lifetimes by 1 Gyr to 100 Gyr, though they still enter the red-giant phase. For example, a Sun-like star has a main-sequence lifetime which can be increased by up to 3 Gyr. This requires a mass-loss rate of about $0.05 {\rm M}_{\mathrm{Ceres}}$ per year. We compare star-lifting to other survival strategies and briefly discuss methods for detecting these engineered stars.
description: Accepted by MNRAS. 7 pages, 5 figures
Funisciurus lemniscatus
Creators: name: Hoffmann, Robert S.
name: Anderson, Charles G.
Publisher: name: Zenodo
Year: 1993
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Mammalia
Rodentia
Sciuridae
Funisciurus
Funisciurus lemniscatus

description: Funisciurus lemniscatus (Le Conte, 1857). Proc. Acad. Nat. Sci. Philadelphia, p. 11. TYPE LOCALITY: Equatorial Guinea, Rio Muni, "...from Western Africa." DISTRIBUTION: S of Sanaga River (Cameroon), Central African Republic, Zaire. SYNONYMS: mayumbicus Kershaw, 1923; sharpei (Gray, 1873).
description: Published as part of Robert S. Hoffmann & Charles G. Anderson, 1993, Order Rodentia - Family Sciuridae, pp. 419-465 in Mammal Species of the World (2 nd Edition), Washington and London :Smithsonian Institution Press on page 427, DOI: 10.5281/zenodo.7353130