cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Disparities of Larmor's/Liénard's formulations with special relativity and energy-momentum conservation
Creators: name: Singal, Ashok K.
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: It is shown that the familiar Larmor's formula or its relativistic generalization, Liénard's formula, widely believed to represent the instantaneous radiative losses from an accelerated charge, are not compatible with the special theory of relativity (STR). We demonstrate this in the case of a charge emitting synchrotron radiation where the agency responsible for acceleration (the magnetic field) does no work and thus all the energy-momentum carried by the radiation has to be balanced unambiguously against the kinetic energy-momentum of the moving charge. The application of the radiation reaction inferred from Larmor's/Liénard's formulas in two different inertial frames, yields results that are not in conformity with the relativistic transformations. Further, we show that energy-momentum conservation is violated in all inertial frames when we try to balance the energy-momentum carried by the electromagnetic radiation against the loss of kinetic energy and momentum of the radiating charge in accordance with Larmor's formula. We point out a mathematical subtlety in the applicability of Poynting's theorem, that seems to have been overlooked in the text-book derivation of Larmor's formula, where a proper distinction between "real" and "retarded" times was not kept, and which has therefore given rise to such anomalies, including the mysterious Schott term, which happens to be nothing but the difference in rate of change of energy in self-fields of the charge between retarded and present times.
description: 8 pages, 1 figure
Unification of Gauge and Gravity Chern-Simons Theories in 3-D Space time
Creators: name: Saghir, Chireen A.
name: Shamseddine, Laurence W.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Chamseddine and Mukhanov showed that gravity and gauge theories could be unified in one geometric construction provided that a metricity condition is imposed on the vielbein. In this paper we are going to show that by enlarging the gauge group we are able to unify Chern-Simons gauge theory and Chern-Simons gravity in 3-D space-time. Such unification leads to the quantization of the coefficients for both Chern-Simons terms for compact groups but not for non-compact groups. Moreover, it leads to a topological invariant quantity of the 3 dimensional space-time manifold on which they are defined.
Entanglement properties of the time periodic Kitaev Chain
Creators: name: Yates, Daniel J.
name: Mitra, Aditi
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The entanglement properties of the time periodic Kitaev chain with nearest neighbor and next nearest neighbor hopping, is studied. The cases of the exact eigenstate of the time periodic Hamiltonian, referred to as the Floquet ground state (FGS), as well as a physical state obtained from time-evolving an initial state unitarily under the influence of the time periodic drive are explored. Topological phases are characterized by different numbers of Majorana zero ($\mathbb{Z}_0$) and $π$ ($\mathbb{Z}_π$) modes, where the zero modes are present even in the absence of the drive, while the $π$ modes arise due to resonant driving. The entanglement spectrum (ES) of the FGS as well as the physical state show topological Majorana modes whose number is different from that of the quasi-energy spectrum. The number of Majorana edge modes in the ES of the FGS vary in time from $|\mathbb{Z}_0-\mathbb{Z}_π|$ to $\mathbb{Z}_0+\mathbb{Z}_π$ within one drive cycle, with the maximal $\mathbb{Z}_0+\mathbb{Z}_π$ modes appearing at a special time-reversal symmetric point of the cycle. For the physical state on the other hand, only the modes inherited from the initial wavefunction, namely the $\mathbb{Z}_0$ modes, appear in the ES. The $\mathbb{Z}_π$ modes are absent in the physical state as they merge with the bulk excitations that are simultaneously created due to resonant driving. The topological properties of the Majorana zero and $π$ modes in the ES are also explained by mapping the parent wavefunction to a Bloch sphere.
description: 16 pages, 20 figures
The Hubble Catalog of Variables
Creators: name: Sokolovsky, K.
name: Bonanos, A.
name: Gavras, P.
name: Yang, M.
name: Hatzidimitriou, D.
name: Moretti, M. I.
name: Karampelas, A.
name: Bellas-Velidis, I.
name: Spetsieri, Z.
name: Pouliasis, E.
name: Georgantopoulos, I.
name: Charmandaris, V.
name: Tsinganos, K.
name: Laskaris, N.
name: Kakaletris, G.
name: Nota, A.
name: Lennon, D.
name: Arviset, C.
name: Whitmore, B.
name: Budavari, T.
name: Downes, R.
name: Lubow, S.
name: Rest, A.
name: Strolger, L.
name: White, R.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We aim to construct an exceptionally deep (V ~< 27) catalog of variable objects in selected Galactic and extragalactic fields visited multiple times by the Hubble Space Telescope (HST). While HST observations of some of these fields were searched for specific types of variables before (most notably, the extragalactic Cepheids), we attempt a systematic study of the population of variable objects of all types at the magnitude range not easily accessible with ground-based telescopes. The variability timescales that can be probed range from hours to years depending on how often a particular field has been visited. For source extraction and cross-matching of sources between visits we rely on the Hubble Source Catalog which includes 10^7 objects detected with WFPC2, ACS, and WFC3 HST instruments. The lightcurves extracted from the HSC are corrected for systematic effects by applying local zero-point corrections and are screened for bad measurements. For each lightcurve we compute variability indices sensitive to a broad range of variability types. The indices characterize the overall lightcurve scatter and smoothness. Candidate variables are selected as having variability index values significantly higher than expected for objects of similar brightness in the given set of observations. The Hubble Catalog of Variables will be released in 2018.
description: 5 pages, 3 figures, 1 table, proceedings of the 22nd Los Alamos Stellar Pulsation Conference "Wide-field variability surveys: a 21st-century perspective" held in San Pedro de Atacama, Chile, Nov. 28-Dec. 2, 2016
Multiwavelength Analysis of Dark Matter Annihilation and RX-DMFIT
Creators: name: McDaniel, Alex
name: Jeltema, Tesla
name: Profumo, Stefano
name: Storm, Emma
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Dark matter (DM) particles are predicted by several well motivated models to yield Standard Model particles through self-annihilation that can potentially be detected by astrophysical observations. In particular, the production of charged particles from DM annihilation in astrophysical systems that contain magnetic fields yields radio emission through synchrotron radiation and X-ray emission through inverse Compton scattering of ambient photons. We introduce RX-DMFIT, a tool used for calculating the expected secondary emission from DM annihilation. RX-DMFIT includes a wide range of customizable astrophysical and particle parameters and incorporates important astrophysics including the diffusion of charged particles, relevant radiative energy losses, and magnetic field modelling. We demonstrate the use and versatility of RX-DMFIT by analyzing the potential radio and X-ray signals for a variety of DM particle models and astrophysical environments including galaxy clusters, dwarf spheroidal galaxies and normal galaxies. We then apply RX-DMFIT to a concrete example using Segue I radio data to place constraints for a range of assumed DM annihilation channels. For WIMP models with $M_χ \leq 100$ GeV and assuming weak diffusion, we find that the the leptonic $μ^+μ^-$ and $τ^+τ^-$ final states provide the strongest constraints, placing limits on the DM particle cross-section well below the thermal relic cross-section, while even for the $b\bar{b}$ channel we find limits close to the thermal relic cross-section. Our analysis shows that radio emission provides a highly competitive avenue for dark matter searches.
description: 21 pages, 9 figures, 2 tables, corrections to figures, additional text, accepted to JCAP
Magnons in a two dimensional transverse field XXZ model
Creators: name: Kar, Satyaki
name: Wierschem, Keola
name: Sengupta, Pinaki
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The XXZ model on a square lattice in the presence of a transverse magnetic field is studied within the spin wave theory to investigate the resulting canted antiferromagnet. The small and large field regimes are probed separately both for easy-axis and easy-plane scenarios which reveal an unentangled factorized ground state at an intermediate value of the field. Goldstone modes are obtained for the field-free $XY$ antiferromagnet as well as for the isotropic antiferromagnet with field up to its saturation value. Moreover, for an easy-plane anisotropy, we find that there exists a non-zero field, where magnon degeneracy appears as a result of restoration of an U(1) sublattice symmetry and that, across that field, there occurs a magnon band crossing. For completeness, we then obtain the system phase diagram for $S=1/2$ via large scale quantum Monte Carlo simulations using the stochastic series expansion technique. Our numerical method is based on a quantization of spin along the direction of the applied magnetic field and does not suffer from a sign-problem, unlike comparable algorithms based on a spin quantization along the axis of anisotropy. With this formalism, we are also able to obtain powder averages of the transverse and longitudinal magnetizations, which may be useful for understanding experimental measurements on polycrystalline samples.
description: 12 pages, 9 figures
Single-molecule theory of enzymatic inhibition predicts the emergence of inhibitor-activator duality
Creators: name: Robin, Tal
name: Reuveni, Shlomi
name: Urbakh, Michael
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: The classical theory of enzymatic inhibition aims to quantitatively describe the effect of certain molecules -- called inhibitors -- on the progression of enzymatic reactions, but growing signs indicate that it must be revised to keep pace with the single-molecule revolution that is sweeping through the sciences. Here, we take the single enzyme perspective and rebuild the theory of enzymatic inhibition from the bottom up. We find that accounting for multi-conformational enzyme structure and intrinsic randomness cannot undermine the validity of classical results in the case of competitive inhibition; but that it should strongly change our view on the uncompetitive and mixed modes of inhibition. There, stochastic fluctuations on the single-enzyme level could give rise to inhibitor-activator duality -- a phenomenon in which, under some conditions, the introduction of a molecule whose binding shuts down enzymatic catalysis will counter intuitively work to facilitate product formation. We state -- in terms of experimentally measurable quantities -- a mathematical condition for the emergence of inhibitor-activator duality, and propose that it could explain why certain molecules that act as inhibitors when substrate concentrations are high elicit a non-monotonic dose response when substrate concentrations are low. The fundamental and practical implications of our findings are thoroughly discussed.
Monotonicity-based Electrical Impedance Tomography for Lung Imaging
Creators: name: Zhou, Liangdong
name: Harrach, Bastian
name: Seo, Jin Keun
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: Optimization and Control (math.OC)
subject: Medical Physics (physics.med-ph)
subject: FOS: Biological sciences
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: This paper presents a monotonicity-based spatiotemporal conductivity imaging method for continuous regional lung monitoring using electrical impedance tomography (EIT). The EIT data (i.e., the boundary current-voltage data) can be decomposed into pulmonary, cardiac and other parts using their different periodic natures. The time-differential current-voltage operator corresponding to the lung ventilation can be viewed as either semi-positive or semi-negative definite owing to monotonic conductivity changes within the lung regions. We used this monotonicity constraints to improve the quality of lung EIT imaging. We tested the proposed methods in numerical simulations, phantom experiments and human experiments.
description: 27 pages, 17 figures
Lipschitz-free spaces over compact subsets of superreflexive spaces are weakly sequentially complete
Creators: name: Kochanek, Tomasz
name: Pernecká, Eva
Publisher: name: arXiv
Year: 2017
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 46B03, 46B20, 54E35

description: Let $M$ be a compact subset of a superreflexive Banach space. We prove that the Lipschitz-free space $\mathcal{F}(M)$, the predual of the Banach space of Lipschitz functions on $M$, has the Pełczyński's property ($V^\ast$). As a consequence, the Lipschitz-free space $\mathcal{F}(M)$ is weakly sequentially complete.
description: 19 pages. Section 4 providing examples added. Connections between the main result and properties (V*) and (X) discussed in the Introduction
Extreme values of the Riemann zeta function and its argument
Creators: name: Bondarenko, Andriy
name: Seip, Kristian
Publisher: name: arXiv
Year: 2017
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: We combine our version of the resonance method with certain convolution formulas for $ζ(s)$ and $\log\, ζ(s)$. This leads to a new $Ω$ result for $|ζ(1/2+it)|$: The maximum of $|ζ(1/2+it)|$ on the interval $1 \le t \le T$ is at least $\exp\left((1+o(1)) \sqrt{\log T \log\log\log T/\log\log T}\right)$. We also obtain conditional results for $S(t):=1/π$ times the argument of $ζ(1/2+it)$ and $S_1(t):=\int_0^t S(τ)dτ$. On the Riemann hypothesis, the maximum of $|S(t)|$ is at least $c \sqrt{\log T \log\log\log T/\log\log T}$ and the maximum of $S_1(t)$ is at least $c_1 \sqrt{\log T \log\log\log T/(\log\log T)^3}$ on the interval $T^β \le t \le T$ whenever $0\le β< 1$.
description: This is the final version of the paper which has been accepted for publication in Mathematische Annalen
How do we measure cost-effectiveness of a new medical product?
Creators: name: Harvey, Elizabeth
Publisher: name: figshare
Year: 2022
Subjects: subject: 111504 Pharmaceutical Sciences
subject: FOS: Clinical medicine

description: There is a need for consistent use of plain language communications to support patient involvement in health economics and outcomes research (HEOR). This summary provides a plain language explanation of the definition and methods used for measuring cost-effectiveness of a new medical product.
Biphoton Interference in a Double-Slit Experiment
Creators: name: Paul, Ananya
name: Qureshi, Tabish
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A double-slit experiment with entangled photons is theoretically analyzed. It is shown that, under suitable conditions, two entangled photons of wavelength $λ$ can behave like a \emph{biphoton} of wavelength $λ/2$. The interference of these biphotons, passing through a double-slit can be obtained by detecting both photons of the pair at the same position. This is in agreement with the results of an earlier experiment. More interestingly, we show that even if the two entangled photons are separated by a polarizing beam splitter, they can still behave like a biphoton of wavelength $λ/2$. In this modified setup, the two separated photons passing through two different double-slits, surprisingly show an interference corresponding to a wavelength $λ/2$, instead of $λ$ which is the wavelength of each photon. We point out two experiments that have been carried out in different contexts, which saw the effect predicted here without realizing this connection.
description: Published version
Uncertainty relations: An operational approach to the error-disturbance tradeoff
Creators: name: Renes, Joseph M.
name: Scholz, Volkher B.
name: Huber, Stefan
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The notions of error and disturbance appearing in quantum uncertainty relations are often quantified by the discrepancy of a physical quantity from its ideal value. However, these real and ideal values are not the outcomes of simultaneous measurements, and comparing the values of unmeasured observables is not necessarily meaningful according to quantum theory. To overcome these conceptual difficulties, we take a different approach and define error and disturbance in an operational manner. In particular, we formulate both in terms of the probability that one can successfully distinguish the actual measurement device from the relevant hypothetical ideal by any experimental test whatsoever. This definition itself does not rely on the formalism of quantum theory, avoiding many of the conceptual difficulties of usual definitions. We then derive new Heisenberg-type uncertainty relations for both joint measurability and the error-disturbance tradeoff for arbitrary observables of finite-dimensional systems, as well as for the case of position and momentum. Our relations may be directly applied in information processing settings, for example to infer that devices which can faithfully transmit information regarding one observable do not leak any information about conjugate observables to the environment. We also show that Englert's wave-particle duality relation [PRL 77, 2154 (1996)] can be viewed as an error-disturbance uncertainty relation.
description: v3: title change, accepted in Quantum; v2: 29 pages, 7 figures; improved definition of measurement error. v1: 26.1 pages, 6 figures; supersedes arXiv:1402.6711
Factorized duality, stationary product measures and generating functions
Creators: name: Redig, Frank
name: Sau, Federico
Publisher: name: arXiv
Year: 2017
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: We find all factorized duality functions for a class of interacting particle systems. The functions we recover are self-duality functions for interacting particle systems such as zero-range processes, symmetric inclusion and exclusion processes, as well as duality and self-duality functions for their continuous counterparts. The approach is based on, firstly, a general relation between factorized duality functions and stationary product measures and, secondly, an intertwining relation provided by generating functions. For the interacting particle systems, these self-duality and duality functions turn out to be generalizations of those previously obtained in [9] and, more recently, in [8]. Thus, we discover that only these two families of dualities cover all possible cases. Moreover, the same method discloses all self-duality functions for interacting diffusion systems such as the Brownian energy process, where both the process and its dual are in continuous variables.
description: Introduction and Section 5 rewritten. The results do not change. Part of Section 4 has been moved to Section 2
Driven by Excess? Climatic Implications of New Global Mapping of Near-Surface Water-Equivalent Hydrogen on Mars
Creators: name: Pathare, Asmin V.
name: Feldman, William C.
name: Prettyman, Thomas H.
name: Maurice, Sylvestre
Publisher: name: arXiv
Year: 2017
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present improved Mars Odyssey Neutron Spectrometer (MONS) maps of near-surface Water-Equivalent Hydrogen (WEH) on Mars that have intriguing implications for the global distribution of "excess" ice, which occurs when the mass fraction of water ice exceeds the threshold amount needed to saturate the pore volume in normal soils. We have refined the crossover technique of Feldman et al. (2011) by using spatial deconvolution and Gaussian weighting to create the first globally self-consistent map of WEH. At low latitudes, our new maps indicate that WEH exceeds 15% in several near-equatorial regions, such as Arabia Terra, which has important implications for the types of hydrated minerals present at low latitudes. At high latitudes, we demonstrate that the disparate MONS and Phoenix Robotic Arm (RA) observations of near surface WEH can be reconciled by a three-layer model incorporating dry soil over fully saturated pore ice over pure excess ice: such a three-layer model can also potentially explain the strong anticorrelation of subsurface ice content and ice table depth observed at high latitudes. At moderate latitudes, we show that the distribution of recently formed impact craters is also consistent with our latest MONS results, as both the shallowest ice-exposing crater and deepest non-ice-exposing crater at each impact site are in good agreement with our predictions of near-surface WEH. Overall, we find that our new mapping is consistent with the widespread presence at mid-to-high Martian latitudes of recently deposited shallow excess ice reservoirs that are not yet in equilibrium with the atmosphere.
description: 89 pages, 33 figures, revision submitted to Icarus
A Practical Randomized CP Tensor Decomposition
Creators: name: Battaglino, Casey
name: Ballard, Grey
name: Kolda, Tamara G.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: The CANDECOMP/PARAFAC (CP) decomposition is a leading method for the analysis of multiway data. The standard alternating least squares algorithm for the CP decomposition (CP-ALS) involves a series of highly overdetermined linear least squares problems. We extend randomized least squares methods to tensors and show the workload of CP-ALS can be drastically reduced without a sacrifice in quality. We introduce techniques for efficiently preprocessing, sampling, and computing randomized least squares on a dense tensor of arbitrary order, as well as an efficient sampling-based technique for checking the stopping condition. We also show more generally that the Khatri-Rao product (used within the CP-ALS iteration) produces conditions favorable for direct sampling. In numerical results, we see improvements in speed, reductions in memory requirements, and robustness with respect to initialization.
Race and Income Effects on Park Visitation During COVID-19 in High- and Low-Index Cities
Creators: name: Shu, Senling
Publisher: name: University of Chicago
Year: 2022
Subjects: subject: ParkScore
subject: Covid-19
subject: foot traffic
subject: park inequities
subject: race
subject: SES
subject: accessibility

description: Inequalities in the distribution of parks and green spaces have become an issue of increasing concern during the Covid-19 pandemic since they can disproportionately affect the ability to maintain good health across racial and socioeconomic groups. The present study attempts to understand whether Covid has compounded the disparities in park access and usage based on race and income and whether the disparities varied by the quality of a city’s park system. Using cell phone mobility data, the study compared tract-level park visits in 20 major U.S. cities across racial and income groups before (2019) and during the pandemic (2020). The cities were divided into a high-quality park system group and a low-quality group on the basis of their ParkScore indexes. The results indicated a 6% decline in park visitation during Covid. Regarding park access, the income-based privilege was found in cities with high-quality park systems whereas no racial differences were found regardless in cities with high or low quality of park systems. Only tracts with large Upper-middle-class income families showed increased park usage during the pandemic. Most importantly, the study provides evidence against a positive correlation between physical park accessibility and usability, and it suggests the importance of other factors in promoting park usage.
Solving CFTs with Weakly Broken Higher Spin Symmetry
Creators: name: Alday, Luis F.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The method of large spin perturbation theory allows to analyse conformal field theories (CFT) by turning the crossing equations into an algebraic problem. We apply this method to a generic CFT with weakly broken higher spin (HS) symmetry, to the first non-trivial order in the breaking parameter. We show that the spectrum of broken currents, for any value of the spin, follows from crossing symmetry. After discussing a generic model of a single scalar field, we focus on vector models with $O(N)$ global symmetry. We rediscover the spectrum of several models, including the $O(N)$ Wilson-Fisher model around four dimensions, the large $O(N)$ model in $2
description: 30 pages,v2:typos corrected
Hölder coverings of sets of small dimension
Creators: name: Rossi, Eino
name: Shmerkin, Pablo
Publisher: name: arXiv
Year: 2017
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 28A12, 28A75, 28A80

description: We show that a set of small box counting dimension can be covered by a Hölder graph from all but a small set of directions, and give sharp bounds for the dimension of the exceptional set, improving a result of B. Hunt and V. Kaloshin. We observe that, as a consequence, Hölder graphs can have positive doubling measure, answering a question of T. Ojala and T. Rajala. We also give remarks on Hölder coverings in polar coordinates and, on the other hand, prove that a Homogenous set of small box counting dimension can be covered by a Lipschitz graph from all but a small set of directions.
Red Dog Planet: images to ideas and back again
Creators: name: Mountford, Sam
Publisher: name: Diffractions
Year: 2023

description: The best thing about a visual arts practice is that you get to work with images before committing to words. For me, the research and development of ideas begin in earnest when I have something to look at. These images; typically stills from footage collected on my phone, are the entry point for a more intuitive and associative approach that I find most useful at the earliest stages of a project.
description: Diffractions, n. 6 (2023): Images in Movement
Towards a definition of elemental cinema: matter and representation beyond the ecological divide
Creators: name: Mendes, Margarida
Publisher: name: Diffractions
Year: 2023

description: As in the materialist turn in recent philosophical discourse, cinema too has revealed traces of a renewed appreciation for depicting matter. In a coincidental move, artists and filmmakers across the globe have given matter centre stage and revised representational tactics by allowing materiality to become the main subject in front of the camera. This of course does not imply an erasure of the human figure from the script at all times but redirects the camera’s gaze and proposes a shift in film’s leading protagonists, calling into question the depiction of other-than-human ontologies and a new imagination of the posthuman condition. As one is increasingly haunted by the confluence of virtual and technospheric agents put forward by the era of the Anthropocene, while living under climatic distress, this puts into question how material narratives are taking place and shaping human agency today.
description: Diffractions, n. 6 (2023): Images in Movement
A vehicle-to-infrastructure communication based algorithm for urban traffic control
Creators: name: Van Phu, Cyril Nguyen
name: Farhi, Nadir
name: Haj-Salem, Habib
name: Lebacque, Jean-Patrick
Publisher: name: arXiv
Year: 2017
Subjects: subject: Systems and Control (eess.SY)
subject: Networking and Internet Architecture (cs.NI)
subject: Optimization and Control (math.OC)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: We present in this paper a new algorithm for urban traffic light control with mixed traffic (communicating and non communicating vehicles) and mixed infrastructure (equipped and unequipped junctions). We call equipped junction here a junction with a traffic light signal (TLS) controlled by a road side unit (RSU). On such a junction, the RSU manifests its connectedness to equipped vehicles by broadcasting its communication address and geographical coordinates. The RSU builds a map of connected vehicles approaching and leaving the junction. The algorithm allows the RSU to select a traffic phase, based on the built map. The selected traffic phase is applied by the TLS; and both equipped and unequipped vehicles must respect it. The traffic management is in feedback on the traffic demand of communicating vehicles. We simulated the vehicular traffic as well as the communications. The two simulations are combined in a closed loop with visualization and monitoring interfaces. Several indicators on vehicular traffic (mean travel time, ended vehicles) and IEEE 802.11p communication performances (end-to-end delay, throughput) are derived and illustrated in three dimension maps. We then extended the traffic control to a urban road network where we also varied the number of equipped junctions. Other indicators are shown for road traffic performances in the road network case, where high gains are experienced in the simulation results.
description: 6 pages
Multi-cluster dynamics in $^{13}_Λ{\rm C}$ and analogy to clustering in $^{12}{\rm C}$
Creators: name: Funaki, Y.
name: Isaka, M.
name: Hiyama, E.
name: Yamada, T.
name: Ikeda, K.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We investigate structure of $^{13}_Λ{\rm C}$ and discuss the difference and similarity between the structures of $^{12}{\rm C}$ and $^{13}_Λ{\rm C}$ by answering the questions if the linear-chain and gaslike cluster states, which are proposed to appear in $^{12}{\rm C}$, survives, or new structure states appear or not. We introduce a microscopic cluster model called, Hyper-Tohsaki-Horiuchi-Schuck-Röpke (H-THSR) wave function, which is an extended version of the THSR wave function so as to describe $Λ$ hypernuclei. We obtained two bound states and two resonance (quasi-bound) states for $J^π=0^+$ in $^{13}_Λ{\rm C}$, corresponding to the four $0^+$ states in $^{12}{\rm C}$. However, the inversion of level ordering between the spectra of $^{12}{\rm C}$ and $^{13}_Λ{\rm C}$, i.e. that the $0_3^+$ and $0_4^+$ states in $^{13}_Λ{\rm C}$ correspond to the $0_4^+$ and $0_3^+$ states in $^{12}{\rm C}$, respectively, is shown to occur. The additional $Λ$ particle reduces sizes of the $0_2^+$ and $0_3^+$ states in $^{13}_Λ{\rm C}$ very much, but the shrinkage of the $0_4^+$ state is only a half of the other states. In conclusion, the Hoyle state becomes quite a compact object with ${^{9}_Λ{\rm Be}}+α$ configuration in $^{13}_Λ{\rm C}$ and is no more gaslike state composed of the $3α$ clusters. Instead, the $0_4^+$ state in $^{13}_Λ{\rm C}$, coming from the $^{12}{\rm C}(0_3^+)$ state, appears as a gaslike state composed of $α+α+^{5}_Λ{\rm He}$ configuration, i.e. the Hoyle analog state. A linear-chain state in a $Λ$ hypernucleus is for the first time predicted to exist as the $0_3^+$ state in $^{13}_Λ{\rm C}$ with more shrunk arrangement of the $3α$ clusters along $z$-axis than the $3α$ linear-chain configuration realized in the $^{12}{\rm C}(0_4^+)$ state.
description: 9 pages, 6 figures, figures rearranged, accepted for publication in PLB
Nonvolatile Solid-State Charged-Polymer Gating of Topological Insulators into the Topological Insulating Regime
Creators: name: Ireland, R. M.
name: Wu, Liang
name: Salehi, M.
name: Oh, S.
name: Armitage, N. P.
name: Katz, H. E.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We demonstrate the ability to reduce the carrier concentration of thin films of the topological insulator (TI) Bi2Se3 by utilizing a novel approach, namely non-volatile electrostatic gating via corona charging of electret polymers. Sufficient electric field can be imparted to a polymer-TI bilayer to result in significant electron density depletion, even without the continuous connection of a gate electrode or the chemical modification of the TI. We show that the Fermi level of Bi2Se3 is shifted towards the Dirac point with this method. Using THz spectroscopy, we find that the surface chemical potential is lowered into the bulk band gap (~ 50 meV above the Dirac point and 170 meV below the conduction band minimum) and it is stabilized in the intrinsic regime while enhancing electron mobility. This represents the first use of a charged polymer gate for modulating TI charge density. The mobility of surface state electrons is enhanced to a value as high as ~1600 cm^2/Vs at 5K.
description: Submitted, 5 pages of text, 6 figures
Effects Of leptonic non-unitarity on lepton flavor violation, neutrino oscillation, leptogenesis and lightest neutrino mass
Creators: name: Ghosh, Gayatri
name: Bora, Kalpana
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Neutrino Physics is a mature branch of science with all the three neutrino mixing angles and two mass squared differences determined with high precision. Inspite of several experimental verifications of neutrino oscillations and precise measurements of two mass squared differences and the three mixing angles, the unitarity of the leptonic mixing matrix is not yet established, leaving room for the presence of small non-unitarity effects. Deriving the bounds on these non-unitarity parameters from existing experimental constraints, on cLFV decays such as, $ μ\rightarrow eγ$, $ μ\rightarrow τγ$, $ τ\rightarrow eγ$, we study their effects on the generation of baryon asymmetry through leptogenesis and neutrino oscillation probabilities. We consider a model where see-saw is extended by an additional singlet $ S $ which is very light, but can give rise to non-unitarity effects without affecting the form on see-saw formula. We do a parameter scan of a minimal see-saw model in a type I see-saw framework satisfying the Planck data on baryon to photon ratio of the Universe, which lies in the interval, $5.8\times 10^ {-10} < Y _{B} < 6.6 \times 10^ {-10} (BBN)$. We predict values of lightest neutrino mass, and Dirac and Majorana CP-violating phase $ δ_{CP} $, $ α$ and $ β$, for normal hierarchy and inverted hierarchy for one flavor leptogenesis. It is worth mentioning that all these four quantities are unknown yet, and future experiments will be measuring them.
description: 12 pages, 9 Figures, 3 Tables; Talk presented at the XXII DAE BRNS High energy physics symposium, 12 - 16 December, 2016, Delhi University, Delhi, India
Vibrational Density Matrix Renormalization Group
Creators: name: Baiardi, Alberto
name: Stein, Christopher J.
name: Barone, Vincenzo
name: Reiher, Markus
Publisher: name: arXiv
Year: 2017
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Variational approaches for the calculation of vibrational wave functions and energies are a natural route to obtain highly accurate results with controllable errors. However, the unfavorable scaling and the resulting high computational cost of standard variational approaches limit their application to small molecules with only few vibrational modes. Here, we demonstrate how the density matrix renormalization group (DMRG) can be exploited to optimize vibrational wave functions (vDMRG) expressed as matrix product states. We study the convergence of these calculations with respect to the size of the local basis of each mode, the number of renormalized block states, and the number of DMRG sweeps required. We demonstrate the high accuracy achieved by vDMRG for small molecules that were intensively studied in the literature. We then proceed to show that the complete fingerprint region of the sarcosyn-glycin dipeptide can be calculated with vDMRG.
description: 21 pages, 5 figures, 4 tables
Quando eu quero saborear um momento, eu fecho os olhos
Creators: name: Corso, Carina Pierro
Publisher: name: Diffractions
Year: 2023

description: Carina Pierro Corso é bacharel em Artes Visuais pelo IA-UNICAMP (Instituto de Artes - Universidade Estadual de Campinas) e mestre em Som e Imagem com especialização em Animação pela EA-UCP (Escola das Artes - Universidade Católica Portuguesa). A artista multimídia brasileira atualmente vive em Portugal. Os seus trabalhos são permeados pelo interesse em criar relações corpóreas, afetivas e íntimas com quem as vivencia, sempre tendo uma atenção especial às materialidades que utiliza como linha condutora da sua produção. O presente texto é um ensaio poético-teórico sobre a relação entre animação, materialidade e corpo. As conexões existentes entre estes temas é evidenciada por meio de um experimento animado realizado como resultado prático da minha dissertação de mestrado. Neste trabalho, a pele é o suporte e o sangue é a tinta que desenha as histórias contadas pelos corpos das pessoas que participaram neste exercício.
description: Diffractions, n. 6 (2023): Images in Movement
Search for top quark partners with charge 5/3 in proton-proton collisions at sqrt(s) = 13 TeV
Creators: name: CMS Collaboration
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A search for the production of heavy partners of the top quark with charge 5/3 (X[5/3]) decaying into a top quark and a W boson is performed with a data sample corresponding to an integrated luminosity of 2.3 inverse femtobarns, collected in proton-proton collisions at a center-of-mass energy of 13 TeV with the CMS detector at the CERN LHC. Final states with either a pair of same-sign leptons or a single lepton, along with jets, are considered. No significant excess is observed in the data above the expected standard model background contribution and an X[5/3] quark with right-handed (left-handed) couplings is excluded at 95% confidence level for masses below 1020 (990) GeV. These are the first limits based on a combination of the same-sign dilepton and the single-lepton final states, as well as the most stringent limits on the X[5/3] mass to date.
description: Replaced with the published version. Added the journal reference and DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/B2G-15-006
Gravitational radiation driven capture in unequal mass black hole encounters
Creators: name: Bae, Yeong-Bok
name: Lee, Hyung Mok
name: Kang, Gungwon
name: Hansen, Jakob
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The gravitational radiation driven capture (GR capture) between unequal mass black holes without spins has been investigated with numerical relativistic simulations. We adopt the parabolic approximation which assumes that the gravitational wave radiation from a weakly hyperbolic orbit is the same as that from the parabolic orbit having the same pericenter distance. Using the radiated energies from the parabolic orbit simulations, we have obtained the critical impact parameter ($b_{\rm crit}$) for the GR capture for weakly hyperbolic orbit as a function of initial energy. The most energetic encounters occur around the boundary between the direct merging and the fly-by orbits, and can emit several percent of initial total ADM energy at the peak. When the total mass is fixed, energy and angular momentum radiated in the case of unequal mass black holes are smaller than those of equal mass black holes having the same initial orbital angular momentum for the fly-by orbits. We have compared our results with two different Post-Newtonian (PN) approximations, the exact parabolic orbit (EPO) and PN corrected orbit (PNCO). We find that the agreement between the EPO and the numerical relativity breaks down for very close encounters ($\it{e.g.}$, $b_{\rm crit} \lesssim 100$ M), and it becomes worse for higher mass ratios. For instance, the critical impact parameters can differ by more than $50\%$ from those obtained in EPO if the relative velocity at infinity $v_{\infty}$ is larger than 0.1 for the mass ratio of $m_{1}/m_{2}=16$. The PNCO gives more consistent results than EPO, but it also underestimates the critical impact parameter for the GR capture at $b_{\rm crit} \lesssim40$ M.
description: 10 pages, 9 figures
Irreducible tensor products for symmetric groups in characteristic 2
Creators: name: Morotti, Lucia
Publisher: name: arXiv
Year: 2017
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: We consider non-trivial irreducible tensor products of modular representations of a symmetric group $S_n$ in characteristic 2 for even $n$ completing the proof of a classification conjecture of Gow and Kleshchev about such products.
Discurso documental: reflexões cognitivas e fenomenológicas em questões de rememoração e memória audiovisual
Creators: name: Valkola, Jarmo
name: Cardoso, Eduardo Prado
Publisher: name: Diffractions
Year: 2023

description: O artigo examina ramificações do discurso documental. A abordagem é formulada para dar voz à investigação interdisciplinar sobre o documentário. A ênfase na análise atenta de extractos e entidades documentais de maior dimensão trará uma nova competência para atender a essas várias aspirações. Dá a possibilidade de criar uma sensibilidade avivada nas questões analíticas que cobrem semelhanças e diferenças, bem como as reflexões causais e empíricas. O objectivo é criar uma teia de associações para estas perspetivas e perceber uma abordagem mais ampla do documentário a fim de argumentar que a apropriação significativa de várias tendências nos estudos do documentário requer suficiente correspondência e prontidão dialógica para uma compreensão da legitimidade conceptual, formal e estética deste fenómeno.
description: Diffractions, n. 6 (2023): Images in Movement
Pattern representation and recognition with accelerated analog neuromorphic systems
Creators: name: Petrovici, Mihai A.
name: Schmitt, Sebastian
name: Klähn, Johann
name: Stöckel, David
name: Schroeder, Anna
name: Bellec, Guillaume
name: Bill, Johannes
name: Breitwieser, Oliver
name: Bytschok, Ilja
name: Grübl, Andreas
name: Güttler, Maurice
name: Hartel, Andreas
name: Hartmann, Stephan
name: Husmann, Dan
name: Husmann, Kai
name: Jeltsch, Sebastian
name: Karasenko, Vitali
name: Kleider, Mitja
name: Koke, Christoph
name: Kononov, Alexander
name: Mauch, Christian
name: Müller, Eric
name: Müller, Paul
name: Partzsch, Johannes
name: Pfeil, Thomas
name: Schiefer, Stefan
name: Scholze, Stefan
name: Subramoney, Anand
name: Thanasoulis, Vasilis
name: Vogginger, Bernhard
name: Legenstein, Robert
name: Maass, Wolfgang
name: Schüffny, René
name: Mayr, Christian
name: Schemmel, Johannes
name: Meier, Karlheinz
Publisher: name: arXiv
Year: 2017
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: Neural and Evolutionary Computing (cs.NE)
subject: Machine Learning (stat.ML)
subject: FOS: Biological sciences
subject: FOS: Computer and information sciences

description: Despite being originally inspired by the central nervous system, artificial neural networks have diverged from their biological archetypes as they have been remodeled to fit particular tasks. In this paper, we review several possibilites to reverse map these architectures to biologically more realistic spiking networks with the aim of emulating them on fast, low-power neuromorphic hardware. Since many of these devices employ analog components, which cannot be perfectly controlled, finding ways to compensate for the resulting effects represents a key challenge. Here, we discuss three different strategies to address this problem: the addition of auxiliary network components for stabilizing activity, the utilization of inherently robust architectures and a training method for hardware-emulated networks that functions without perfect knowledge of the system's dynamics and parameters. For all three scenarios, we corroborate our theoretical considerations with experimental results on accelerated analog neuromorphic platforms.
description: accepted at ISCAS 2017
Heavy quark state production in Pb-Pb collisions at $\sqrt{s_{NN}}$=5.02 TeV
Creators: name: Kisslinger, Leonard S.
name: Das, Debasish
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We estimate differential rapidity cross sections for $J/Ψ$, $Ψ(2S)$, $Υ(1S)$, $Υ(2S)$, and $Υ(3S)$ production via Pb-Pb collisions at proton-proton energy $\equiv \sqrt{s_{pp}}$ =5.02 TeV. For the $Ψ(2S)$, $Υ(3S)$ states we use the mixed heavy quark hyrid theory, with these states being approximately 50\% standard and 50\% hybrid charmonium, bottomonium meson states. This is an extension of previous work on heavy quark state production via Cu-Cu and Au-Au collisions at $\sqrt{s_{pp}}$=200 GeV.
description: 7 pages, 4 figures. arXiv admin note: substantial text overlap with arXiv:1309.5374, arXiv:1411.3680
On NMSSM Higgs Search Strategies at the LHC and the Mono-Higgs Signature in Particular
Creators: name: Baum, Sebastian
name: Freese, Katherine
name: Shah, Nausheen R.
name: Shakya, Bibhushan
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We study the collider phenomenology of the extended Higgs sector of the Next-to-Minimal Supersymmetric Standard Model (NMSSM). The region of NMSSM parameter space favored by a 125\,GeV SM-like Higgs and naturalness generically features a light Higgs and neutralino spectrum as well as a large $\mathcal{O}(1)$ coupling between the Higgs doublets and the NMSSM singlet fields. In such regimes, the heavier Higgs bosons can decay dominantly into lighter Higgs bosons and neutralinos. We study the prospects of observing such decays at the 13\,TeV LHC, focusing on mono-Higgs signatures as probes of such regions of parameter space. We present results in a model-independent framework as well as in the NMSSM. In the NMSSM, we find that the mono-Higgs channel can probe TeV scale Higgs bosons and has sensitivity even in the low tan$β$, large $m_A$ regime that is difficult to probe in the MSSM. Unlike for many conventional Higgs searches, the reach of the mono-Higgs channel will improve significantly with the increased luminosity expected to be collected at the LHC in the ongoing and upcoming runs.
description: 32 pages + appendices, 15 + 20 Figures. v2: added references, one comment in abstract and footnote on page 11. v3: matches the published version