cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Qubit Energy Tuner Based on Single Flux Quantum Circuits
Creators: name: Geng, Xiao
name: Huang, Rutian
name: He, Yongcheng
name: He, Kaiyong
name: Dai, Genting
name: Yang, Liangliang
name: Wu, Xinyu
name: Yu, Qing
name: Cheng, Mingjun
name: Chen, Guodong
name: Liu, Jianshe
name: Chen, Wei
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A device called qubit energy tuner (QET) based on single flux quantum (SFQ) circuits is proposed for Z control of superconducting qubits. Created from the improvement of flux digital-to-analog converters (flux DACs), a QET is able to set the energy levels or the frequencies of qubits, especially flux-tunable transmons, and perform gate operations requiring Z control. The circuit structure of QET is elucidated, which consists of an inductor loop and flux bias units for coarse tuning or fine tuning. The key feature of a QET is analyzed to understand how SFQ pulses change the inductor loop current, which provides external flux for qubits. To verify the functionality of the QET, three simulations are carried out. The first one verifies the responses of the inductor loop current to SFQ pulses. The results show that there is about 4.2% relative deviation between analytical solutions of the inductor loop current and the solutions from WRSpice time-domain simulation. The second and the third simulations with QuTip show how a Z gate and an iSWAP gate can be performed by this QET, respectively, with corresponding fidelities 99.99884% and 99.93906% for only once gate operation to specific initial states. These simulations indicate that the SFQ-based QET could act as an efficient component of SFQ-based quantum-classical interfaces for digital Z control of large-scale superconducting quantum computers.
Non-Bunch-Davies Initial State Reconciles Chaotic Models with BICEP and Planck
Creators: name: Ashoorioon, Amjad
name: Dimopoulos, Konstantinos
name: Sheikh-Jabbari, M. M.
name: Shiu, Gary
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The BICEP2 experiment has announced a signal for primordial gravity waves with tensor-to-scalar ratio $r=0.2^{+0.07}_{-0.05}$ [arXiv:1403.3985]. There are two ways to reconcile this result with the latest Planck experiment [arXiv:1303.5082]. One is by assuming that there is a considerable tilt of $r$, $\mathcal{T}_r$, with a positive sign, $\mathcal{T}_r=d\ln r/d\ln k\gtrsim 0.57^{+0.29}_{-0.27}$ corresponding to a blue tilt for the tensor modes of order $n_T\simeq0.53 ^{+0.29}_{-0.27}$, assuming the Planck experiment best-fit value for tilt of scalar power spectrum $n_S$. The other possibility is to assume that there is a negative running in the scalar spectral index, $dn_S/d\ln k\simeq -0.02$ which pushes up the upper bound on $r$ from $0.11$ up to $0.26$ in the Planck analysis assuming the existence of a tensor spectrum. Simple slow-roll models fail to provide such large values for $\mathcal{T}_r$ or negative runnings in $n_S$ [arXiv:1403.3985]. In this note we show that a non-Bunch-Davies initial state for perturbations can provide a match between large field chaotic models (like $m^2ϕ^2$) with the latest Planck result [arXiv:1306.4914] and BICEP2 results by accommodating either the blue tilt of $r$ or the negative large running of $n_S$.
description: v1:5 pages, double column; v2: 6 pages, double column, the option of negative running of scalar spectral index and some references were added; v3: Matched the PLB version
Anomalous Transport in Holographic Chiral Superfluids via Kubo Formulae
Creators: name: Jimenez-Alba, Amadeo
name: Melgar, Luis
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study anomalous conductivities in Chiral Superfluids in the framework of two different holographic models, by means of Kubo formulae. In addition, we point out the existence of an anomalous transport phenomenon that consists in the presence of a charge density when the superfluid velocity is aligned with a magnetic field. It has been pointed out recently that certain chiral conductivities in holographic superfluids exhibit universal behavior at zero temperature. We show that anomalous conductivities always stabilize at low temperatures in our setup. Even though the particular value they acquire is model-dependent, it seems to be robust and determined solely by the interplay between the broken symmetries and the anomalies.
description: 23 pages, 22 figures. v2: references added, minor typos corrected. v3: footnotes added; published version
Learning Bipedal Walking for Humanoids with Current Feedback
Creators: name: Singh, Rohan Pratap
name: Xie, Zhaoming
name: Gergondet, Pierre
name: Kanehiro, Fumio
Publisher: name: arXiv
Year: 2023
Subjects: subject: Robotics (cs.RO)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Recent advances in deep reinforcement learning (RL) based techniques combined with training in simulation have offered a new approach to developing robust controllers for legged robots. However, the application of such approaches to real hardware has largely been limited to quadrupedal robots with direct-drive actuators and light-weight bipedal robots with low gear-ratio transmission systems. Application to real, life-sized humanoid robots has been less common arguably due to a large sim2real gap. In this paper, we present an approach for effectively overcoming the sim2real gap issue for humanoid robots arising from inaccurate torque-tracking at the actuator level. Our key idea is to utilize the current feedback from the actuators on the real robot, after training the policy in a simulation environment artificially degraded with poor torque-tracking. Our approach successfully trains a unified, end-to-end policy in simulation that can be deployed on a real HRP-5P humanoid robot to achieve bipedal locomotion. Through ablations, we also show that a feedforward policy architecture combined with targeted dynamics randomization is sufficient for zero-shot sim2real success, thus eliminating the need for computationally expensive, memory-based network architectures. Finally, we validate the robustness of the proposed RL policy by comparing its performance against a conventional model-based controller for walking on uneven terrain with the real robot.
Spectroscopic properties of nuclear Skyrme energy density functionals
Creators: name: Tarpanov, D.
name: Dobaczewski, J.
name: Toivanen, J.
name: Carlsson, B. G.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We address the question of how to improve the agreement between theoretical nuclear single-particle energies (SPEs) and experiment. Empirically, in doubly magic nuclei, the SPEs can be deduced from spectroscopic properties of odd nuclei that have one more, or one less neutron or proton. Theoretically, bare SPEs, before being confronted with experiment, must be corrected for the effects of the particle-vibration-coupling (PVC). In the present work, we determine the PVC corrections in a fully self-consistent way. Then, we adjust the SPEs, with PVC corrections included, to empirical data. In this way, the agreement with experiment, on average, improves; nevertheless, large discrepancies still remain. We conclude that the main source of disagreement is still in the underlying mean fields, and not in including or neglecting the PVC corrections.
description: 5 pages, 5 figures, extended supplemental material
Measurement of the B->Xsl+l- branching fraction and search for direct CP violation from a sum of exclusive final states
Creators: name: The BABAR Collaboration
name: Lees, J. P.
name: Others
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present a measurement of the total branching fraction of the flavor-changing neutral-current process B->Xsl+l-, along with partial branching fractions in bins of dilepton and hadronic system (Xs) mass, using a sample of 471x10^6 Upsilon(4S)->BBbar events recorded with the BaBar detector at the PEP-II e+e- collider. B mesons are reconstructed by combining a dilepton pair, either e+e- or mu+mu-, with 10 different Xs final states containing exactly one charged or neutral kaon, two or fewer charged pions, and at most one pi0. Using a sum over these exclusive modes as the basis for extrapolation to the fully inclusive rate, we measure a lepton-flavor-averaged inclusive branching fraction BF(B->Xsl+l-) = (6.73 +0.70-0.64[stat] +0.34-0.25[exp syst] +/- 0.50[model syst])x10^-6 for m(l+l-)^2>0.1 GeV^2/c^4. Restricting our analysis exclusively to final states from which a decaying B meson's flavor can be inferred, we additionally report measurements of the direct CP asymmetry ACP in bins of dilepton mass; over the full dilepton mass range, we find ACP=0.04 +/- 0.11 +/- 0.01$ for a lepton-flavor-averaged sample.
description: 34 pages, 25 postscript figures, accepted by PRL
title: Φως και σκιά.  Δύο ρυθμιστές του υπερβατικού στον αρχιτεκτονικό χώρο
title: Light and shadow. Two composers of the transcendent in the architectural space
Creators: name: Ζαχαριαδης Αριστοφανης
name: Γκικοπουλο Πολυξενη
Publisher: name: Technical University of Crete
Year: 2023

description: Η εν λόγω ερευνητική εργασία εστιάζει στη διερεύνηση του Φωτός και της Σκιάς ως βασικά συνθετικά αρχιτεκτονικά εργαλεία, η διαχείριση των οποίων έχει ως στόχο τη χωρική απόδοση του Υπερβατικού. Για τη βέλτιστη κατανόηση όσων πραγματεύονται σε αυτήν, ορίζονται έννοιες όπως είναι οι αισθήσεις και η αντίληψη, ενώ παράλληλα παρατίθενται ορισμένες θεωρίες του (αρχιτεκτονικού) Χώρου. Ο χώρος γίνεται ορατός λόγω της ύπαρξης του φωτός. Το φως είναι ένα στοιχείο αλληλένδετο με το φυσικό περιβάλλον -στο οποίο εντάσσεται το εκάστοτε αρχιτεκτονικό έργο- και έχει την ικανότητα να δημιουργεί ιδιαίτερες χωρικές ποιότητες και ατμόσφαιρες. Με αφορμή τη σχέση του φωτός και της σκιάς ερμηνεύεται ο υπερβατικός χαρακτήρας της φύσης με αποτέλεσμα την ένταξη της έννοιας του υπερβατικού στο πλαίσιο διερεύνησης της παρούσας. Στην συνέχεια, αναπτύσσεται η έννοια του «Υπερβατικού» και ορίζονται έννοιες όπως είναι το «Υψηλό», το «Ιερό», το «Μεταφυσικό», το «Άγνωστο» και το «Θείο». Η εκτενέστερη ανάλυση της έννοιας αυτής οδήγησε στην επιλογή τεσσάρων (4) ιερών χώρων, η μελέτη των οποίων πρόκειται να γίνει στην δεύτερη ενότητα. Στους ιερούς χώρους η ιδιάζουσα αρχιτεκτονική διαχείριση του φωτός αναδεικνύει το ρόλο της σκιάς. Βασικό κριτήριο στη διεξαγωγή των συμπερασμάτων θα αποτελέσει η ανάλυση των παραδειγμάτων βάσει ορισμένων σχεδιαστικών «εργαλείων». Βασικά συνθετικά εργαλεία, όπως αναφέρεται και παραπάνω, αποτελούν το φως και η σκιά τα οποία μελετώνται σε αλληλεξάρτηση με την ύλη, την τομή και την κλίμακα. Είναι εμφανής ο συσχετισμός που επιδιώκεται μεταξύ των άυλων αυτών στοιχείων (φως και σκιά) με τα άλλα που διαμορφώνουν το δομημένο περιβάλλον (ύλη, τομή, κλίμακα). Τα παραπάνω χρησιμοποιούνται από τον αρχιτέκτονα είτε συνδυαστικά είτε μη, και έχουν ως αποτέλεσμα τη δημιουργία χώρων αρχιτεκτονικού ενδιαφέροντος με διαφορετικές ποιότητες και χαρακτήρα. Οι σχέσεις των «εργαλείων» και η σχεδιαστική απόδοσή τους σε ιερούς χώρους που διακρίνονται από τον υπερβατικό τους χαρακτήρα διερευνώνται στην εργασία.
Errata to Stochastic explosion and non-uniqueness for $α$-Riccati equation
Creators: name: Dascaliuc, Radu
name: Pham, Tuan N.
name: Thomann, Enrique A.
name: Waymire, Edward C.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60H30, 34K12, 60J80

description: An error occurs in a part of the statement and proof of Proposition 2.2 in Jour. Math. Anal. and Appl., 476, (2019), 53-85 that is corrected in this erratum. The revised result reveals a new and unexpected critical phenomenon, having further implications for non-uniqueness of solutions to a nonlinear differential equation of the Riccati type.
A Critique on Some Aspects of GUP Effective Metric
Creators: name: Ong, Yen Chin
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The generalized uncertainty principle (GUP) is a gravitational correction of Heisenberg's uncertainty principle, which allows us to probe some features of quantum gravity even without the full theory. We are used to working with metric tensors in general relativity; they are convenient to have available when we wish to calculate physical quantities like Hawking temperature and black hole shadow. Various authors have tried to incorporate GUP into an effective metric that allows such calculations. In this note, I point out that some of these results are not correct due to working with series truncation rather than the full GUP-corrected expressions. Perhaps more importantly, we rely too much on heuristic arguments and lack a guiding principle in constructing the correct effective metric.
Multiparticle Higgs and Vector Boson Amplitudes at Threshold
Creators: name: Khoze, Valentin V.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In a spontaneously broken gauge theory we consider (sub)-processes in which one virtual intermediate state (it can be a Higgs or a gauge field) produces many on-shell Higgses and massive vector bosons. In the kinematic regime where all final states are produced on their mass threshold, we show how to compute iteratively all tree-level amplitudes ${\cal A}_{1\to n+m}$ involving an arbitrary number $n$ of Higgs bosons and $m$ of longitudinal vector bosons in the final state, and list the amplitudes coefficients for up to $n=32$ and $m=32$. We find that these amplitudes exhibit factorial growth not only in the number of scalar fields, but also in the number of longitudinal gauge fields, ${\cal A}_{1\to n+m} \sim n! \,m!$. This growth is not expected to disappear at loop-level in the fixed-order perturbation theory. We conclude that at energies accessible at the next generation of hadron colliders, such as the 50-100 TeV FCC, where $\sqrt{\hat{s}}$ is sufficient to produce $\gg 1/α_W$ of $W,Z$ and $H$, perturbation theory breaks down when applied to the multiparticle electroweak production, at least near the kinematic multiparticle mass threshold where the electroweak gauge-Higgs sector becomes strongly coupled.
description: v3: improved numerical values for m>24 v2: A Mathematica notebook with results and derivations is included with the submission files. 18 pages, 7 Figures
Tracing chirality from molecular organization to triply-periodic network assemblies: Threading biaxial twist through block copolymer gyroids
Creators: name: Prasad, Ishan
name: Reddy, Abhiram
name: Grason, Gregory M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Chirality transfer from the level of molecular structure up to mesoscopic lengthscales of supramolecular morphologies is a broad and persistent theme in self-assembled soft materials, from biological to synthetic matter. Here, we analyze the mechanism of chirality transfer in a prototypical self-assembly system, block copolymers (BCPs), in particular, its impact on one of the most complex and functionally vital phases: the cubic, triply-periodic, gyroid network. Motivated by recent experimental studies, we consider a self-consistent field model of ABC* triblock copolymers possessing an end-block of chain chemistry and examine the interplay between chirality at the scale of networks, in alternating double network phases, and the patterns of segmental order within tubular network domains. We show that while segments in gyroids exhibit twist in both polar and nematic segmental order parameters, the magnitude of net nematic twist is generically much larger than polar twist, and more surprising, {\it reverses handedness} relative to the sense of polar order as well as the sense of dihedral twist of the network. Careful analysis of the intra-domain nematic order reveals that this unique chirality transfer mechanism relies on the strongly biaxial nature of segmental order in BCP networks and relates the {\it biaxial twist} to complex patterns of frame rotation of the principal directors in the intra-domain texture. Finally, we show that this mechanism of twist reversal leads to chirality selection of alternating gyroid networks in ABC* triblocks, in the limit of very weak chirality .
description: 14 pages, 8 figures, 5 appendices
SOBO: A Feedback Bot to Nudge Code Quality in Programming Courses
Creators: name: Bobadilla, Sofia
name: Glassey, Richard
name: Bergel, Alexandre
name: Monperrus, Martin
Publisher: name: arXiv
Year: 2023
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Recent research has shown the great potential of automatic feedback in education. This paper presents SOBO, a bot we designed to automatically provide feedback on code quality to undergraduate students. SOBO has been deployed in a course at the KTH Royal Institute of Technology in Sweden with 130+ students. Overall, SOBO has analyzed 1687 GitHub repositories and produced 8443 tailored code quality feedback messages to students. The quantitative and qualitative results indicate that SOBO effectively nudges students into adopting code quality best practices without interfering with pedagogical objectives or adding a teaching burden. From this experience, we provide guidelines into how to design and deploy teaching bots in programming courses.
Quantifying randomness in protein-protein interaction networks of different species: A random matrix approach
Creators: name: Agrawal, Ankit
name: Sarkar, Camellia
name: Dwivedi, Sanjiv K.
name: Dhasmana, Nitesh
name: Jalan, Sarika
Publisher: name: arXiv
Year: 2013
Subjects: subject: Molecular Networks (q-bio.MN)
subject: FOS: Biological sciences

description: We analyze protein-protein interaction networks for six different species under the framework of random matrix theory. Nearest neighbor spacing distribution of the eigenvalues of adjacency matrices of the largest connected part of these networks emulate universal Gaussian orthogonal statistics of random matrix theory. We demonstrate that spectral rigidity, which quantifies long range correlations in eigenvalues, for all protein-protein interaction networks follow random matrix prediction up to certain ranges indicating randomness in interactions. After this range, deviation from the universality evinces underlying structural features in network.
description: 20 pages, 5 figures
The edge ideals of $\bf{t}$-spread $d$-partite hypergraphs
Creators: name: Musapaşaoğlu, Aslı
name: Nasernejad, Mehrdad
name: Qureshi, Ayesha Asloob
Publisher: name: arXiv
Year: 2023
Subjects: subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics

description: Inspired by the definition of $\bf{t}$-spread monomial ideals, in this paper, we introduce $\bf{t}$-spread $d$-partite hypergraph $K^{\bf t}_V$ and study its edge ideal $I(K^{\bf t}_V)$. We prove that $I(K^{\bf t}_V)$ has linear quotients, all powers of $I(K^{\bf t}_V)$ have linear resolution and the Rees algebra of $I(K^{\bf t}_V)$ is a normal Cohen-Macaulay domain. It is also shown that $I(K^{\bf t}_V)$ is normally torsion-free and a complete characterization of Cohen-Macaulay $S/I(K^{\bf t}_V)$ is given.
description: Comments are welcome
Hadamard state in Schwarzschild-de Sitter spacetime
Creators: name: Brum, Marcos
name: Jorás, Sergio E.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We construct a state in the Schwarzschild-de Sitter spacetime which is invariant under the action of its group of symmetries. Our state is not defined in the whole Kruskal extension of this spacetime, but rather in a subset of the maximally extended conformal diagram. The construction is based on a careful use of the bulk-to-boundary technique. We will show that our state is Hadamard and that it is not a KMS state, differently from the case of states constructed in spacetimes containing only one event horizon.
description: More emphasis put on the result. 41 pages. Uses natbib and iopart. This version is going to be published in Classical and Quantum Gravity. PACS numbers: 04.62.+v,04.70.Dy,03.65.Fd. arXiv admin note: text overlap with arXiv:0907.1034 by other authors
Greybody factors for higher-dimensional non-commutative geometry inspired black holes
Creators: name: Cox, Zachary
name: Gingrich, Douglas M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Greybody factors are computed for massless fields of spin 0, 1/2, 1, and 2 emitted from higher-dimensional non-commutative geometry inspired black holes. Short-range potentials are used with path-ordered matrix exponentials to numerically calculate transmission coefficients. The resulting absorption cross sections and emission spectra are computed on the brane and compared with the higher-dimensional Schwarzschild-Tangherlini black hole. A non-commutative black hole at its maximum temperature in seven extra dimensions will radiate a particle flux and power of 0.72-0.81 and 0.75-0.81, respectively, times lower than a Schwarzschild-Tangherlini black hole of the same temperature. A non-commutative black hole at its maximum temperature in seven extra dimensions will radiate a particle flux and power of 0.64-0.72 and 0.60-0.64, respectively, times lower than a Schwarzschild-Tangherlini black hole of the same mass.
description: 27 pages, 13 figures; addresses referees' comments
Mimic3D: Thriving 3D-Aware GANs via 3D-to-2D Imitation
Creators: name: Chen, Xingyu
name: Deng, Yu
name: Wang, Baoyuan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Graphics (cs.GR)
subject: FOS: Computer and information sciences

description: Generating images with both photorealism and multiview 3D consistency is crucial for 3D-aware GANs, yet existing methods struggle to achieve them simultaneously. Improving the photorealism via CNN-based 2D super-resolution can break the strict 3D consistency, while keeping the 3D consistency by learning high-resolution 3D representations for direct rendering often compromises image quality. In this paper, we propose a novel learning strategy, namely 3D-to-2D imitation, which enables a 3D-aware GAN to generate high-quality images while maintaining their strict 3D consistency, by letting the images synthesized by the generator's 3D rendering branch to mimic those generated by its 2D super-resolution branch. We also introduce 3D-aware convolutions into the generator for better 3D representation learning, which further improves the image generation quality. With the above strategies, our method reaches FID scores of 5.4 and 4.3 on FFHQ and AFHQ-v2 Cats, respectively, at 512x512 resolution, largely outperforming existing 3D-aware GANs using direct 3D rendering and coming very close to the previous state-of-the-art method that leverages 2D super-resolution. Project website: https://seanchenxy.github.io/Mimic3DWeb.
Additional file 1 of Inhibition of DRP-1 mitochondrial mitophagy and fission by novel α-aminophosphonates bearing pyridine: synthesis, biological evaluations, and computer-aided design
Creators: name: Hekal, Hend A.
name: Salem, Maha M.
name: El Salam, Hayam A. Abd
Publisher: name: figshare
Year: 2024
Subjects: Biophysics
Biochemistry
Pharmacology
Biotechnology
Chemical Sciences not elsewhere classified
Biological Sciences not elsewhere classified
Cancer

description: Supplementary Material 1.
Loop quantum gravity of a spherically symmetric scalar field coupled to gravity with a clock
Creators: name: Gambini, Rodolfo
name: Pullin, Jorge
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The inclusion of matter fields in spherically symmetric loop quantum gravity has proved problematic at the level of implementing the constraint algebra including the Hamiltonian constraint. Here we consider the system with the introduction of a clock. Using the Abelianizaton technique we introduced in previous papers in the case of gravity coupled to matter, the system can be gauge fixed and rewritten in terms of a restricted set of dynamical variables that satisfy simple Poisson bracket relations. This creates a true Hamiltonian and therefore one bypasses the issue of the constraint algebra. We show how loop quantum gravity techniques may be applied for the vacuum case and show that the Hamiltonian system reproduces previous results for the physical space of states and the observables of a Schwarzchild black hole.
description: 10 pages, RevTex, no figures, to appear in Classical and Quantum Gravity
Positivity of rational functions and their diagonals
Creators: name: Straub, Armin
name: Zudilin, Wadim
Publisher: name: arXiv
Year: 2013
Subjects: subject: Number Theory (math.NT)
subject: Classical Analysis and ODEs (math.CA)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05A15, 11F11, 33C20, 33F10

description: The problem to decide whether a given rational function in several variables is positive, in the sense that all its Taylor coefficients are positive, goes back to Szegő as well as Askey and Gasper, who inspired more recent work. It is well known that the diagonal coefficients of rational functions are $D$-finite. This note is motivated by the observation that, for several of the rational functions whose positivity has received special attention, the diagonal terms in fact have arithmetic significance and arise from differential equations that have modular parametrization. In each of these cases, this allows us to conclude that the diagonal is positive. Further inspired by a result of Gillis, Reznick and Zeilberger, we investigate the relation between positivity of a rational function and the positivity of its diagonal.
description: 16 pages
Atrial natriuretic peptide inhibits renin release from juxtaglomerular cells by a cGMP-mediated process
Creators: name: Kurtz, Armin
name: Della Bruna, R.
name: Pfeilschifter, J.
name: Taugner, R.
name: Bauer, Christian
Publisher: name: Universität Regensburg
Year: 1986
Subjects: subject: 570 Biowissenschaften, Biologie
subject: 610 Medizin
subject: Aminoquinolines/diagnostic use
subject: Animals
subject: Atrial Natriuretic Factor/pharmacology
subject: Calcium/physiology
subject: Cells, Cultured
subject: Cyclic GMP/physiology
subject: Dose-Response Relationship, Drug
subject: Juxtaglomerular Apparatus/secretion
subject: Rats
subject: Renin/secretion
subject: Secretory Rate/drug effects

description: We have examined the effect of a synthetic analogue of human alpha-atrial natriuretic peptide (ANP), APII, on renin release in cultured renal juxtaglomerular cells (JGA cells). Using cell cultures containing 80-90% renal juxtaglomerular cells, we found that ANP (10(-13)-10(-9) M) strongly inhibited renin release from the cells in a dose-dependent fashion (ki, 10 pM) to about 10% of control. Inhibition of renin release by ANP was paralleled by an increase in cellular cGMP levels; while in the presence of the cGMP-phosphodiesterase inhibitor M&B 22948 (1 mM), concentrations of ANP lower by a factor of 100 were required to obtain the same effects on renin release and cGMP levels. The guanylate cyclase inhibitor methylene blue (10 microM), on the other hand, shifted the dose-response curves for renin release and cGMP levels to 100-fold higher concentrations of ANP. Neither the influx of 45Ca into the cells nor the intracellular quin-2 signal, which is a measure for changes of intracellular Ca concentration, was in any way altered by ANP. Our results suggest that ANP inhibits renin release from juxtaglomerular cells by a cGMP-dependent process that does not involve changes in intracellular calcium.
Comparing bipartite entropy growth in open-system matrix-product simulation methods
Creators: name: Preisser, Guillermo
name: Wellnitz, David
name: Botzung, Thomas
name: Schachenmayer, Johannes
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: The dynamics of one-dimensional quantum many-body systems is often numerically simulated with matrix-product states (MPSs). The computational complexity of MPS methods is known to be related to the growth of entropies of reduced density matrices for bipartitions of the chain. While for closed systems the entropy relevant for the complexity is uniquely defined by the entanglement entropy, for open systems it depends on the choice of the representation. Here, we systematically compare the growth of different entropies relevant to the complexity of matrix-product representations in open-system simulations. We simulate an XXZ spin-1/2 chain in the presence of spontaneous emission and absorption, and dephasing. We compare simulations using a representation of the full density matrix as a matrix-product density operator (MPDO) with a quantum trajectory unraveling, where each trajectory is itself represented by an MPS (QT+MPS). We show that the bipartite entropy in the MPDO description (operator entanglement, OE) generally scales more favorably with time than the entropy in QT+MPS (trajectory entanglement, TE): i) For spontaneous emission and absorption the OE vanishes while the TE grows and reaches a constant value for large dissipative rates and sufficiently long times; ii) for dephasing the OE exhibits only logarithmic growth while the TE grows polynomially. Although QT+MPS requires a smaller local state space, the more favorable entropy growth can thus make MPDO simulations fundamentally more efficient than QT+MPS. Furthermore, MPDO simulations allow for easier exploitation of higher-order Trotter decompositions and translational invariance, allowing for larger time steps and system sizes.
description: 13 pages, 9 figures
The paradox of progress for sexual and gender diverse youth
Creators: name: Fish, Jessica N.
name: Russell, Stephen T.
Publisher: name: Current Opinion in Psychology
Year: 2022
Subjects: LGBTQ+
Youth
Adolescence
Adolescent development
Policy
Stigma
Minority stress
Coming out

description: In this essay, we explore diversity in sexual and gender identities, with a focus on implications of the current politicized moment for lesbian, gay, bisexual, transgender, queer, or questioning youth. As youth come out at younger ages, their personal identity development collides with the adolescence period characterized by peer influence, stigma, and possible victimization. We consider the changing and diverse experiences of coming out in adolescence for sexual and gender diverse youth. The current social and political moment offers possibilities for new identities, yet anti-LGBTQ + legislative and policy actions have crucial implications for health and wellbeing for youth.
Topological edge states of 1D chains and index theory
Creators: name: Thiang, Guo Chuan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mathematical Physics (math-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We provide an elementary proof and refinement of a well-known idea from physics: a chiral-symmetric local Hamiltonian on a half-space has the same signed number of edge-localized states with energies in the bulk band gap, as its bulk winding number. The requirement of non-elementary methods to relate generic and non-generic cases is emphasized. Our hands-on approach complements a quick abstract proof based on the classical index theory of Toeplitz operators.
description: 24 pages, Prop. 4.6 proof simplified and corrected
A Self-Consistent Extrapolation Method for the Complex Permittivity and Permeability Based on Finite Frequency Data
Creators: name: Dantas, Christine C.
name: Rezende, Mirabel. C.
name: Pinto, Simone S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We describe a method of extrapolation based on a "truncated" Kramers-Kronig relation for the complex permittivity ($ε$) and permeability ($μ$) parameters of a material, based on finite frequency data. Considering a few assumptions, such as the behavior of the loss tangent and the overall nature of corrections, the method is robust within a small relative error, if the assumed hypotheses hold at the extrapolated frequency range.
description: 27 pages, 19 figures, accepted for publication in the Journal of Computational Interdisciplinary Sciences (JCIS); this version matches the accepted version
Additional file 1 of Whole genome sequence analysis of population structure and insecticide resistance markers in Anopheles melas from the Bijagós Archipelago, Guinea-Bissau
Creators: name: Moss, Sophie
name: Pretorius, Elizabeth
name: Ceesay, Sainey
name: da Silva, Eunice Teixeira
name: Hutchins, Harry
name: Ndiath, Mamadou Ousmane
name: Acford-Palmer, Holly
name: Collins, Emma L.
name: Higgins, Matthew
name: Phelan, Jody
name: Jones, Robert T.
name: Vasileva, Hristina
name: Rodrigues, Amabelia
name: Krishna, Sanjeev
name: Clark, Taane G.
name: Last, Anna
name: Campino, Susana
Publisher: name: figshare
Year: 2024
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 1
Three-Hair Relations for Rotating Stars: Nonrelativistic Limit
Creators: name: Stein, Leo C.
name: Yagi, Kent
name: Yunes, Nicolas
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The gravitational field outside of astrophysical black holes is completely described by their mass and spin frequency, as expressed by the no-hair theorems. These theorems assume vacuum spacetimes, and thus they apply only to black holes and not to stars. Despite this, we analytically find that the gravitational potential of arbitrarily rapid rigidly rotating stars can still be described completely by only their mass, spin angular momentum, and quadrupole moment. Although these results are obtained in the nonrelativistic limit (to leading order in a weak-field expansion of general relativity, GR), they are also consistent with fully relativistic numerical calculations of rotating neutron stars. This description of the gravitational potential outside the source in terms of just three quantities is approximately universal (independent of equation of state). Such universality may be used to break degeneracies in pulsar and future gravitational wave observations to extract more physics and test GR in the strong-field regime.
description: 5 pages, 3 figures. Updated to match version published in ApJ
Stellar-mass black holes in the Hyades star cluster?
Creators: name: Torniamenti, Stefano
name: Gieles, Mark
name: Penoyre, Zephyr
name: Jerabkova, Tereza
name: Wang, Long
name: Anders, Friedrich
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Astrophysical models of binary-black hole mergers in the Universe require a significant fraction of stellar-mass black holes (BHs) to receive negligible natal kicks to explain the gravitational wave detections. This implies that BHs should be retained even in open clusters with low escape velocities ($\lesssim1~\mathrm{km \, s^{-1}}$). We search for signatures of the presence of BHs in the nearest open cluster to the Sun - the Hyades - by comparing density profiles of direct $N$-body models to data from $Gaia$. The observations are best reproduced by models with $2-3$ BHs at present. Models that never possessed BHs have an half-mass radius $\sim30\%$ smaller than the observed value, while those where the last BHs were ejected recently ($\lesssim150~$Myr ago) can still reproduce the density profile. In 50% of the models hosting BHs, we find BHs with stellar companion(s). Their period distribution peaks at $\sim10^3$ yr, making them unlikely to be found through velocity variations. We look for potential BH companions through large $Gaia$ astrometric and spectroscopic errors, identifying 56 binary candidates - none of which consistent with a massive compact companion. Models with $2-3$ BHs have an elevated central velocity dispersion, but observations can not yet discriminate. We conclude that the present-day structure of the Hyades requires a significant fraction of BHs to receive natal kicks smaller than the escape velocity of $\sim 3\, \mathrm{km \, s^{-1}}$ at the time of BH formation and that the nearest BHs to the Sun are in, or near, Hyades.
description: 20 pages, 15 figures, 5 tables. Accepted for publication in MNRAS. Comments welcome
Chaotic motion of charged particles in toroidal magnetic configurations
Creators: name: Cambon, Benjamin
name: Leoncini, Xavier
name: Vittot, Michel
name: Dumont, Rémi
name: Garbet, Xavier
Publisher: name: arXiv
Year: 2014
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We study the motion of a charged particle in a tokamak magnetic field and discuss its chaotic nature. Contrary to most of recent studies, we do not make any assumption on any constant of the motion and solve numerically the cyclotron gyration using Hamiltonian formalism. We take advantage of a symplectic integrator allowing us to make long-time simulations. First considering an idealized magnetic configuration, we add a non generic perturbation corresponding to a magnetic ripple, breaking one of the invariant of the motion. Chaotic motion is then observed and opens questions about the link between chaos of magnetic field lines and chaos of particle trajectories. Second, we return to a axi-symmetric configuration and tune the safety factor (magnetic configuration) in order to recover chaotic motion. In this last setting with two constants of the motion, the presence of chaos implies that no third global constant exists, we highlight this fact by looking at variations of the first order of the magnetic moment in this chaotic setting. We are facing a mixed phase space with both regular and chaotic regions and point out the difficulties in performing a global reduction such as gyrokinetics.
Tight-binding simulations of electrically driven spin-valley transitions in carbon nanotube quantum dots
Creators: name: Osika, E. N.
name: Mreńca, A.
name: Szafran, B.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We describe dynamics of spin and valley transitions driven by alternating electric fields in quantum dots defined electrostatically within semiconducting carbon nanotubes (CNT). We use the tight-binding approach to describe the states localized within a quantum dot taking into account the circumferential spin-orbit interaction due to the s-p hybridization and external fields. The basis of eigenstates localized in the quantum dot is used in the solution of the time-dependent Schroedinger equation for description of spin flips and inter-valley transitions that are driven by periodic perturbation in the presence of coupling between the spin, valley and orbital degrees of freedom. Besides the first order transitions we find also fractional resonances. We discuss the transition rates with selection rules that are lifted by atomic disorder and the bend of the tube. We demonstrate that the electric field component perpendicular to the axis of the CNT activates spin transitions which are otherwise absent and that the resonant spin-flip time scales with the inverse of the electric field.
Take 5: Interpretable Image Classification with a Handful of Features
Creators: name: Norrenbrock, Thomas
name: Rudolph, Marco
name: Rosenhahn, Bodo
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences
subject: I.2.4

description: Deep Neural Networks use thousands of mostly incomprehensible features to identify a single class, a decision no human can follow. We propose an interpretable sparse and low dimensional final decision layer in a deep neural network with measurable aspects of interpretability and demonstrate it on fine-grained image classification. We argue that a human can only understand the decision of a machine learning model, if the features are interpretable and only very few of them are used for a single decision. For that matter, the final layer has to be sparse and, to make interpreting the features feasible, low dimensional. We call a model with a Sparse Low-Dimensional Decision SLDD-Model. We show that a SLDD-Model is easier to interpret locally and globally than a dense high-dimensional decision layer while being able to maintain competitive accuracy. Additionally, we propose a loss function that improves a model's feature diversity and accuracy. Our more interpretable SLDD-Model only uses 5 out of just 50 features per class, while maintaining 97% to 100% of the accuracy on four common benchmark datasets compared to the baseline model with 2048 features.
Additional file 1 of Characterising illness stages and recovery trajectories of eating disorders in young people via remote measurement technology (STORY): a multi-centre prospective cohort study protocol
Creators: name: Kuehne, Carina
name: Phillips, Matthew D.
name: Moody, Sarah
name: Bryson, Callum
name: Campbell, Iain C.
name: Conde, Pauline
name: Cummins, Nicholas
name: Desrivières, Sylvane
name: Dineley, Judith
name: Dobson, Richard
name: Douglas, Daire
name: Folarin, Amos
name: Gallop, Lucy
name: Hemmings, Amelia
name: İnce, Başak
name: Mason, Luke
name: Rashid, Zulqarnain
name: Bromell, Alice
name: Sims, Christopher
name: Allen, Karina
name: Bailie, Chantal
name: Bains, Parveen
name: Basher, Mike
name: Battisti, Francesca
name: Baudinet, Julian
name: Bristow, Katherine
name: Dawson, Nicola
name: Dodd, Lizzie
name: Frater, Victoria
name: Freudenthal, Robert
name: Gripton, Beth
name: Kan, Carol
name: Khor, Joel W. T.
name: Kotze, Nicus
name: Laverack, Stuart
name: Martin, Lee
name: Maxwell, Sarah
name: McDonald, Sarah
name: McKnight, Delysia
name: McKay, Ruairidh
name: Merrin, Jessica
name: Nash, Mel
name: Nicholls, Dasha
name: Palmer, Shirlie
name: Pearce, Samantha
name: Roberts, Catherine
name: Serpell, Lucy
name: Severs, Emilia
name: Simic, Mima
name: Staton, Amelia
name: Westaway, Sian
name: Sharpe, Helen
name: Schmidt, Ulrike
name: Bartel, Heike
name: French, Tara
name: Kelly, Jonathan
name: Micali, Nadia
name: Raman, Sneha
name: Treasure, Janet
name: Malik, Umairah
name: Rabelo-da-Ponte, Diego
name: Stephens, Fiona
name: Opitz, Tine
name: Trompeter, Nora
name: Wilkins, Jessica
name: Parnell, Tamsin
name: Abbas, Ruby
name: Davis, Grace
name: Eadie, Cameron
name: Gracie, Lara
name: Heslop, Beck
name: McKenzie, Katie
name: Odubanjo, Eniola
name: Sims, Chris
name: Street, Tallulah
name: Tavares-Semedo, Andreia
name: Wilkinson, Eleanor
name: Zocek, Lucy
Publisher: name: figshare
Year: 2024
Subjects: subject: Medicine
subject: Physiology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Science Policy
subject: Mental Health

description: Additional file 1. RMT Speech Task Instructions.
Trend-Cycle Interactions and the Subprime Crisis: Analysis of US and Canadian Output
Creators: name: Soloschenko, Max
name: Weber, Enzo
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: unobserved component, trend, cycle, identification, subprime crisis
subject: 330 Wirtschaft
subject: C32
subject: E32

description: In the following paper a simultaneous unobserved components model is applied to US and Canadian output data in order to examine the causal structure of trend and cycle shocks and the way it changes over time. The main focus is placed on the analysis of the subprime crisis impact on the trend and cycle components. The structural model is identified by means of heteroscedasticity. During the subprime crisis for both countries we determine the strong increase of the structural trend variance compared to the previous period. This underlines the permanent effect and, thus, structural problems as a potential cause. Moreover, the both components are more volatile in the USA than in Canada. A further similarity between both countries is the complete disappearance of the structural cycle shock volatility.
Shadows in dyonic Kerr-Sen black holes
Creators: name: Jana, Soumya
name: Kar, Sayan
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Black holes with dyonic charges in Einstein-Maxwell-dilaton-axion supergravity theory are revisited in the context of black hole shadows. We consider static as well as rotating (namely the dyonic Kerr-Sen) black holes. The matter stress-energy tensor components, sourced by the Maxwell, axion and dilaton fields satisfy the standard energy conditions. The analytical expressions for the horizon and the shadow radius of the static spacetimes demonstrate their dependence on $P^2+Q^2$ ($P$, $Q$ the magnetic and electric charges, respectively) and the mass parameter $M$. The shadow radius lies in the range $2M
description: 28 pages, 9 figures, published version
Polymeric Quantization and Black Hole Thermodynamics
Creators: name: Gorji, M. A.
name: Nozari, Kourosh
name: Vakili, B.
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Polymer quantization is a non-standard representation of the quantum mechanics that inspired by loop quantum gravity. To study the associated statistical mechanics, one needs to find microstates' energies which are eigenvalues of the Hamiltonian operator in the polymer framework. But, this is not an easy task at all since the Hamiltonian takes a nonlinear form in polymer picture. In this paper, we introduce a semiclassical method in which it is not necessary to solve the eigenvalue problem. Instead, we work with the classical Hamiltonian function and the deformed density of states in the polymeric phase space. Implementing this method, we obtain the canonical partition function for the polymerized systems and we show that our results are in good agreement with those arising from full quantum considerations. Using the partition function, we study the thermodynamics of quantum Schwarzschild black hole and we obtain corrections to the Bekenstein-Hawking entropy due to loop quantum gravity effects.
description: 13 pages, no figures, revised for PLB, title changed