cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Hamilton-Jacobi theory and integrability for autonomous and non-autonomous contact systems
Creators: name: de León, Manuel
name: Lainz, Manuel
name: López-Gordón, Asier
name: Rivas, Xavier
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mathematical Physics (math-ph)
subject: Symplectic Geometry (math.SG)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 37J55, 70H20, 70H33, 53D10, 53Z05

description: In this paper, we study the integrability of contact Hamiltonian systems, both time-dependent and independent. In order to do so, we construct a Hamilton--Jacobi theory for these systems following two approaches, obtaining two different Hamilton--Jacobi equations. Compared to conservative Hamiltonian systems, contact Hamiltonian systems depend of one additional parameter. The fact of obtaining two equations reflects whether we are looking for solutions depending on this additional parameter or not. In order to illustrate the theory developed in this paper, we study three examples: the free particle with a linear external force, the freely falling particle with linear dissipation and the damped and forced harmonic oscillator.
description: 27 pages
Periods and global invariants of automorphic representations
Creators: name: Bernstein, Joseph
name: Reznikov, Andre
Publisher: name: arXiv
Year: 2013
Subjects: subject: Number Theory (math.NT)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: We consider periods of automorphic representations of adele groups defined by integrals along Gelfand subgroups. We define natural maps between local components of such periods and construct corresponding global maps using automorphic $L$-functions. This leads to an introduction of a global invariant of an automorphic representation arising from two such periods. We compute this invariant in some cases.
description: To appear
Zeeman effects on Yu-Shiba-Rusinov states
Creators: name: Machida, T.
name: Nagai, Y.
name: Hanaguri, T.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: When the exchange interaction between the impurity spin and the spins of itinerant quasiparticles are strong or weak enough, the ground states for a magnetic impurity in a superconductor are the screened or free spins, respectively. In both cases, the lowest excited state is a bound state within the superconducting gap, known as the Yu-Shiba-Rusinov (YSR) state. The YSR state is spatially localized, energetically isolated, and fully spin-polarized, leading to applications such as functional scanning probes. While any application demands identifying whether the impurity spin is screened or free, a suitable experimental technique has been elusive. Here we demonstrate an unambiguous way to determine the impurity ground state using the Zeeman effect. We performed ultra-low temperature scanning tunneling spectroscopy of junctions formed between a Cu(111) surface and superconducting Nb tips decorated by single magnetic Fe atoms. Depending on the condition of the Fe adsorbate, the YSR peak in the spectrum either splits or shifts in a magnetic field, signifying that the Fe spin is screened or free, respectively. Our observations provide renewed insights into the competition between magnetism and superconductivity and constitute a basis for the applications of the YSR state.
description: 21 pages, 10 figures
SOP for PALscript Editor to modify methods created using TriPlus RSH Sampling Workflow Editor
Creators: name: Biomarker Analytical Laboratories
Publisher: name: Zenodo
Year: 2024

description: PALscript Editor allows more feature control and changing of settings for optimising methods developed for the TriPlus RSH autosampler. In this procedure, an example of method editing for optimising automation of derivatisation based on ‘SOP for on-line sequential 2 step derivatization method creation using TriPlus RSH Sampling Workflow Editor’ is shown.
description: Research Infrastructure RECETOX RI (No LM2023069) financed by the Ministry of Education, Youth and Sports, and Operational Programme Research, Development and Innovation - project CETOCOEN EXCELLENCE (No CZ.02.1.01/0.0/0.0/17_043/0009632).
Smooth Entropy Bounds on One-Shot Quantum State Redistribution
Creators: name: Berta, Mario
name: Christandl, Matthias
name: Touchette, Dave
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: Information Theory (cs.IT)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: In quantum state redistribution as introduced in [Luo and Devetak (2009)] and [Devetak and Yard (2008)], there are four systems of interest: the $A$ system held by Alice, the $B$ system held by Bob, the $C$ system that is to be transmitted from Alice to Bob, and the $R$ system that holds a purification of the state in the $ABC$ registers. We give upper and lower bounds on the amount of quantum communication and entanglement required to perform the task of quantum state redistribution in a one-shot setting. Our bounds are in terms of the smooth conditional min- and max-entropy, and the smooth max-information. The protocol for the upper bound has a clear structure, building on the work [Oppenheim (2008)]: it decomposes the quantum state redistribution task into two simpler quantum state merging tasks by introducing a coherent relay. In the independent and identical (iid) asymptotic limit our bounds for the quantum communication cost converge to the quantum conditional mutual information $I(C:R|B)$, and our bounds for the total cost converge to the conditional entropy $H(C|B)$. This yields an alternative proof of optimality of these rates for quantum state redistribution in the iid asymptotic limit. In particular, we obtain a strong converse for quantum state redistribution, which even holds when allowing for feedback.
description: v3: 29 pages, 1 figure, extended strong converse discussion
Shear Viscosity in a Non-Fermi Liquid Phase of a Quadratic Semimetal
Creators: name: Dumitrescu, Philipp T.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study finite temperature transport in the Luttinger-Abrikosov-Beneslavskii phase -- an interacting, scale invariant, non-Fermi liquid phase found in quadratic semimetals. We develop a kinetic equation formalism to describe the d.c. transport properties, which are dominated by collisions, and compute the shear viscosity $η$. The ratio of shear viscosity to entropy density $η/s$ is a measure of the strength of interaction between the excitations of a quantum fluid. As a consequence of the quantum critical nature of the system, $η/ s$ is a universal number and we find it to be consistent with a bound proposed from gauge-gravity duality.
description: 5+5 pages, 2 figures; Published Version
A central limit theorem for the spatial Lambda Fleming-Viot process with selection
Creators: name: Forien, Raphaël
name: Penington, Sarah
Publisher: name: arXiv
Year: 2015
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60G57, 60F05, 60J25, 92D10

description: We study the evolution of gene frequencies in a population living in $\mathbb{R}^d$, modelled by the spatial Lambda Fleming-Viot process with natural selection (Barton, Etheridge and Veber, 2010 and Etheridge, Veber and Yu, 2014). We suppose that the population is divided into two genetic types, $a$ and $A$, and consider the proportion of the population which is of type $a$ at each spatial location. If we let both the selection intensity and the fraction of individuals replaced during reproduction events tend to zero, the process can be rescaled so as to converge to the solution to a reaction-diffusion equation (typically the Fisher-KPP equation, as in Etheridge, Veber and Yu, 2014). We show that the rescaled fluctuations converge in distribution to the solution to a linear stochastic partial differential equation. Depending on whether offspring dispersal is only local or if large scale extinction-recolonization events are allowed to take place, the limiting equation is either the stochastic heat equation with a linear drift term driven by space-time white noise or the corresponding fractional heat equation driven by a coloured noise which is white in time. If individuals are diploid (i.e. either $AA$, $Aa$ or $aa$) and if natural selection favours heterozygous ($Aa$) individuals, a stable intermediate gene frequency is maintained in the population. We give estimates for the asymptotic effect of random fluctuations around the equilibrium frequency on the local average fitness in the population. In particular, we find that the size of this effect - known as the drift load - depends crucially on the dimension $d$ of the space in which the population evolves, and is reduced relative to the case without spatial structure.
description: minor corrections and typos
Improving the precision of weak measurements by postselection measurement
Creators: name: Pang, Shengshi
name: Brun, Todd A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Postselected weak measurement is a useful protocol for amplifying weak physical effects. However, there has recently been controversy over whether it gives any advantage in precision. While it is now clear that retaining failed postselections can yield more Fisher information than discarding them, the advantage of postselection measurement itself still remains to be clarified. In this Letter, we address this problem by studying two widely used estimation strategies: averaging measurement results, and maximum likelihood estimation, respectively. For the first strategy, we find a surprising result that squeezed coherent states of the pointer can give postselected weak measurements a higher signal-to-noise ratio than standard ones while all standard coherent states cannot, which suggests that raising the precision of weak measurements by postselection calls for the presence of "nonclassicality" in the pointer states. For the second strategy, we show that the quantum Fisher information of postselected weak measurements is generally larger than that of standard weak measurements, even without using the failed postselection events, but the gap can be closed with a proper choice of system state.
description: 12 pages, 1 figure. V3: close to the published version. V2: analysis of squeezed coherent state and comparison between SNR and Fisher information added, supplemental material expanded
DEVELOPMENT OF METHODS FOR THE CHEMICAL CHARACTERIZATION OF AVIATION FUELS BY CHEMICAL IONIZATION MASS SPECTROMETRY
Creators: name: Guthrie, Jacob D
Publisher: name: Purdue University Graduate School
Year: 2023
Subjects: classificationCode: 340199
subject: Analytical chemistry not elsewhere classified

description: Aviation fuels are complex mixtures that mostly consist of a wide range of different hydrocarbons but also contain small amounts of heteroatom-containing compounds. Different fuels can have very different physical and chemical properties (e.g., storage and thermal stabilities are influenced by the heteroatom-containing compounds), with some performing better as fuels than others. To address this situation, correlations need to be developed between the chemical composition of fuels and their properties. This requires that the chemical compounds in fuels are correctly characterized, which is challenging. Because of the large number and many different types of organic compounds present in fuels, separation of these compounds by using techniques such as one- (GC) and -two-dimensional gas chromatography (GC×GC) is necessary before mass spectrometric characterization. Furthermore, analysis using traditional electron ionization (EI) mass spectrometry is hampered by excessive fragmentation that often leads to complete absence of a stable molecular radical cation, thus preventing the determination of the molecular weight (MW) of the analyte. To explore alternative methods, GC coupled with methane chemical ionization (CI) triple quadrupole mass spectrometry and GC×GC coupled with methane CI time-of-flight high-resolution mass spectrometry, both in the positive-ion mode, were tested. While both chromatographic techniques separate volatile organic chemicals via boiling point and intermolecular forces, GC×GC methods incorporate a greater level of separation by taking advantage of secondary column of different polarity. This additional level of separation can help separate overlapping compounds that would be impossible in GC. What comes to mass spectrometry analysis, methane CI was found to be more predictable and “softer” than the traditionally employed EI. Several ions revealing the MW of the analyte, e.g., M+•, [M+H-H2]+, and/or [M+H]+, were generated for almost every compound studied with some associated fragmentation. These fragmentation patterns provided invaluable structural information. When combined with the number of carbon atoms in the diagnostic ions, double bond and ring equivalent (DBRE) values, and elemental compositions, all obtained from highly accurate mass measurements performed using the time-of-flight mass spectrometer (but not the quadrupole), the classification of the compounds was possible. In some instances, even the unambiguous identification of individual compounds in aviation fuels was possible.
A Graph Isomorphism-based Decentralized Algorithm for Modular Robot Configuration Formation
Creators: name: Dutta, Ayan
name: Dasgupta, Prithviraj
name: Nelson, Carl
Publisher: name: arXiv
Year: 2016
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: We consider the problem of configuration formation in modular robot systems where a set of modules that are initially in different configurations and located at different locations are required to assume appropriate positions so that they can get into a new, user-specified, target configuration. We propose a novel algorithm based on graph isomorphism, where the modules select locations or spots in the target configuration using a utility-based framework, while retaining their original configuration to the greatest extent possible, to reduce the time and energy required by the modules to assume the target configuration. We have shown analytically that our proposed algorithm is complete and guarantees a Pareto-optimal allocation. Experimental simulations of our algorithm with different number of modules in different initial configurations and located initially at different locations, show that the planning time of our algorithm is nominal (order of msec. for 100 modules). We have also compared our algorithm against a market-based allocation algorithm and shown that our proposed algorithm performs better in terms of time and number of messages exchanged.
Precise predictions and new insights for atomic ionisation from the Migdal effect
Creators: name: Cox, Peter
name: Dolan, Matthew J.
name: McCabe, Christopher
name: Quiney, Harry M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: The scattering of neutral particles by an atomic nucleus can lead to electronic ionisation and excitation through a process known as the Migdal effect. We revisit and improve upon previous calculations of the Migdal effect, using the Dirac-Hartree-Fock method to calculate the atomic wavefunctions. Our methods do not rely on the use of the dipole approximation, allowing us to present robust results for higher nuclear recoil velocities than was previously possible. Our calculations provide the theoretical foundations for future measurements of the Migdal effect using neutron sources, and searches for dark matter in direct detection experiments. We show that multiple ionisation must be taken into account in experiments with fast neutrons, and derive the semi-inclusive probability for processes that yield a hard electron above a defined energy threshold. We present results for the noble elements up to and including xenon, as well as carbon, fluorine, silicon and germanium. The transition probabilities from our calculations are publicly available.
description: 19 pages, 12 figures; v2: journal version
Signatures of the $A^2$ term in ultrastrongly-coupled oscillators
Creators: name: Tufarelli, Tommaso
name: McEnery, K. R.
name: Maier, S. A.
name: Kim, M. S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study a bosonic matter excitation coupled to a single-mode cavity field via electric dipole. Counter-rotating and $A^2$ terms are included in the interaction model, ${\mathbf A}$ being the vector potential of the cavity field. In the ultrastrong coupling regime the vacuum of the bare modes is no longer the ground state of the Hamiltonian and contains a nonzero population of polaritons, the true normal modes of the system. If the parameters of the model satisfy the Thomas-Reiche-Kuhn sum rule, we find that the two polaritons are always equally populated. We show how this prediction could be tested in a quenching experiment, by rapidly switching on the coupling and analyzing the radiation emitted by the cavity. A refinement of the model based on a microscopic minimal coupling Hamiltonian is also provided, and its consequences on our results are characterized analytically.
description: 11 pages, 5 figures
Localization of the glueball and possible decuplets of tensor mesons
Creators: name: Majewski, Michal
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We continue the study of flavor aspects of strong interaction. The answer to the question of glueball existence is probably a necessary step in this investigation. The existence of the glueball implies the existence of the decuplet. The model we consider requires that the mass of meson decuplet dominated by the glueball is enclosed between the masses of the ideal nonet N and S states. This description is applied to the two sets of the tensor mesons. One of them comprise the well known particles which are attributed to the widely known nonet $2^{++}$. We argue that they belong to a decuplet if there exists the isoscalar tensor meson having the mass obeying the condition on glueball dominated meson; the meson $f_2(1430)$ could be a candidate. Another set includes large number of mesons lying in the 2GeV region. This set is used to test ability of the model to select particles belonging to the decuplet.
description: 21 pages. Published version
Capture of dark matter particles by a galaxy in the case of a bimodal distribution of their velocities
Creators: name: Durrer, Ruth
name: Parnovsky, Serge
name: Parnowski, Aleksei
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We have analyzed the rate of capture of dark matter (DM) particles by the galaxy in the case of the existence of two different types of DM or a bimodal velocity distribution function for DM. It is shown that, in addition to the scenario considered in our previous work which is based on the assumption of an unimodal distribution, more complex scenarios are possible in which the transition to the state of intense capture and/or exit from it can occur in two stages. A detailed description is given of the change in the curve describing the rate of capture of dark matter particles as a function of the rate of increase in the baryon mass of the galaxy for various values of the rate of decrease of the DM density.
description: 5 papers, 4 figures
Bulk-interface correspondences for one dimensional topological materials with inversion symmetry
Creators: name: Thiang, Guo Chuan
name: Zhang, Hai
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mathematical Physics (math-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Analysis of PDEs (math.AP)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The interface between two materials described by spectrally gapped Hamiltonians is expected to host an in-gap interface mode, whenever a certain topological invariant changes across the interface. We provide a precise statement of this bulk-interface correspondence, and its rigorous justification. The correspondence applies to continuum and lattice models of interfaces between one-dimensional materials with inversion symmetry, with dislocation models being of particular interest. For continuum models, the analysis of the parity of the "edge" Bloch modes is the key component in our argument, while for the lattice models, the relative Zak phase and index theory are.
description: 34 pages, 2 figures. Minor revision
Contract-Based General-Purpose GPU Programming
Creators: name: Kolesnichenko, Alexey
name: Poskitt, Christopher M.
name: Nanz, Sebastian
name: Meyer, Bertrand
Publisher: name: arXiv
Year: 2014
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences
subject: D.3.2; D.3.4

description: Using GPUs as general-purpose processors has revolutionized parallel computing by offering, for a large and growing set of algorithms, massive data-parallelization on desktop machines. An obstacle to widespread adoption, however, is the difficulty of programming them and the low-level control of the hardware required to achieve good performance. This paper suggests a programming library, SafeGPU, that aims at striking a balance between programmer productivity and performance, by making GPU data-parallel operations accessible from within a classical object-oriented programming language. The solution is integrated with the design-by-contract approach, which increases confidence in functional program correctness by embedding executable program specifications into the program text. We show that our library leads to modular and maintainable code that is accessible to GPGPU non-experts, while providing performance that is comparable with hand-written CUDA code. Furthermore, runtime contract checking turns out to be feasible, as the contracts can be executed on the GPU.
RDMSU Survey instrument 2020
Creators: name: Griffin, Tina
Publisher: name: University of Illinois at Chicago
Year: 2023
Subjects: classificationCode: 46
subject: Information and computing sciences

description: This survey was developed and distributed in Fall 2020 to those working in the research data management (RDM) field. It consists of 63 questions related to service models, strategic planning, infrastructure, accountability, and challenges in providing research data services over time.
 It was developed with the support of UIC's Survey Research Lab and built/distributed with Qualtrics Survey Software.
 It was reviewed by 8 RDM practicitioners for bias and clarity. The survey takes approximately 30-45 minutes to complete.
 This survey research was determined to be exempt by UIC (2020-0938) and UPenn (844332).
Statistical mechanics of covariant systems with multi-fingered time
Creators: name: Chirco, Goffredo
name: Josset, Thibaut
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Recently, in [Class. Quantum Grav. 33 (2016) 045005], the authors proposed a new approach extending the framework of statistical mechanics to reparametrization-invariant systems with no additional gauges. In this work, the approach is generalized to systems defined by more than one Hamiltonian constraints (multi-fingered time). We show how well known features as the Ehrenfest- Tolman effect and the Jüttner distribution for the relativistic gas can be consistently recovered from a covariant approach in the multi-fingered framework. Eventually, the crucial role played by the interaction in the definition of a global notion of equilibrium is discussed.
description: 5 pages, 2 figures
Exotic Quantum Phase Transitions of $(2+1)d$ Dirac fermions
Creators: name: Slagle, Kevin
name: You, Yi-Zhuang
name: Xu, Cenke
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Using determinant quantum Monte Carlo (d-QMC) simulations, we demonstrate that an extended Hubbard model on a bilayer honeycomb lattice has two novel quantum phase transitions. The first is a quantum phase transition between the weakly interacting gapless Dirac fermion phase and a strongly interacting fully gapped and symmetric trivial phase, which cannot be described by the standard Gross-Neveu model. The second is a quantum critical point between a quantum spin Hall insulator with spin $S^z$ conservation and the previously mentioned strongly interacting fully gapped phase. At the latter quantum critical point the single particle excitations remain gapped, while spin and charge gap both close. We argue that the first quantum phase transition is related to the $\mathbb{Z}_{16}$ classification of the topological superconductor $^3\text{He-B}$ phase with interactions, while the second quantum phase transition is a topological phase transition described by a bosonic O(4) nonlinear sigma model field theory with a $Θ$-term.
description: 12 pages, 9 figures
Zeroes of combinations of Bessel functions and mean charge of graphene nanodots
Creators: name: Beneventano, C. G.
name: Fialkovsky, I. V.
name: Santangelo, E. M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mathematical Physics (math-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We establish some properties of the zeroes of sums and differences of contiguous Bessel functions of the first kind. As a byproduct, we also prove that the zeroes of the derivatives of Bessel functions of the first kind of different orders are interlaced the same way as the zeroes of Bessel functions themselves. As a physical motivation, we consider gated graphene nanodots subject to Berry-Mondragon boundary conditions. We determine the allowed energy levels and calculate the mean charge at zero temperature. We discuss in detail its dependence on the gate (chemical) potential.
description: vesrion accepted to Theoretical and Mathematical Physics, 18 pages, 1 figure
Concordance group of virtual knots
Creators: name: Boden, Hans U.
name: Nagel, Matthias
Publisher: name: arXiv
Year: 2016
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M25, 57M27

description: We study concordance of virtual knots. Our main result is that a classical knot K is virtually slice if and only if it is classically slice. From this we deduce that the concordance group of classical knots embeds into the concordance group of long virtual knots.
Compression in the Space of Permutations
Creators: name: Wang, Da
name: Mazumdar, Arya
name: Wornell, Gregory
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We investigate lossy compression (source coding) of data in the form of permutations. This problem has direct applications in the storage of ordinal data or rankings, and in the analysis of sorting algorithms. We analyze the rate-distortion characteristic for the permutation space under the uniform distribution, and the minimum achievable rate of compression that allows a bounded distortion after recovery. Our analysis is with respect to different practical and useful distortion measures, including Kendall-tau distance, Spearman's footrule, Chebyshev distance and inversion-$\ell_1$ distance. We establish equivalence of source code designs under certain distortions and show simple explicit code designs that incur low encoding/decoding complexities and are asymptotically optimal. Finally, we show that for the Mallows model, a popular nonuniform ranking model on the permutation space, both the entropy and the maximum distortion at zero rate are much lower than the uniform counterparts, which motivates the future design of efficient compression schemes for this model.
description: accepted to IEEE Transaction on Information Theory
Topological Quantum Computation on Supersymmetric Spin Chains
Creators: name: Jana, Indrajit
name: Montorsi, Filippo
name: Padmanabhan, Pramod
name: Trancanelli, Diego
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Quantum gates built out of braid group elements form the building blocks of topological quantum computation. They have been extensively studied in $SU(2)_k$ quantum group theories, a rich source of examples of non-Abelian anyons such as the Ising ($k=2$), Fibonacci ($k=3$) and Jones-Kauffman ($k=4$) anyons. We show that the fusion spaces of these anyonic systems can be precisely mapped to the product state zero modes of certain Nicolai-like supersymmetric spin chains. As a result, we can realize the braid group on the product state zero modes of these supersymmetric systems. These operators kill all the other states in the Hilbert space, thus preventing the occurrence of errors while processing information, making them suitable for quantum computing.
description: 56 pages, 17 figures, v2 to appear in JHEP. Includes stability analysis
On Deformations of Hyperbolic Varities
Creators: name: Kummer, Mario
name: Shamovich, Eli
Publisher: name: arXiv
Year: 2016
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: In this paper we study flat deformations of real subschemes of $\mathbb{P}^n$, hyperbolic with respect to a fixed linear subspace, i.e. admitting a finite surjective and real fibered linear projection. We show that the subset of the corresponding Hilbert scheme consisting of such subschemes is closed and connected in the classical topology. Every smooth variety in this set lies in the interior of this set. Furthermore, we provide sufficient conditions for a hyperbolic subscheme to admit a flat deformation to a smooth hyperbolic subscheme. This leads to new examples of smooth hyperbolic varieties.
XQCAT: eXtra Quark Combined Analysis Tool
Creators: name: Barducci, D.
name: Belyaev, A.
name: Buchkremer, M.
name: Marrouche, J.
name: Moretti, S.
name: Panizzi, L.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: XQCAT (eXtra Quark Combined Analysis Tool) is a tool aimed at determining exclusion confidence levels for scenarios of new physics characterised by the presence of one or multiple heavy extra quarks which interact through Yukawa couplings with any of the Standard Model quarks. The code uses a database of efficiencies for pre-simulated processes of QCD-induced pair production of extra quarks and their subsequent on-shell decays. In the version 1.2 of XQCAT the efficiencies have been computed for a set of seven publicly available search results by the CMS experiment. The input for the code is a text file in which masses, branching ratios and dominant chirality of the couplings of the new quarks are provided. The output of the code is the exclusion confidence levels of the test point for each implemented experimental analysis considered individually and, when possible, in statistical combination.
description: 18 pages, 2 figures, version accepted for publication in Comp. Phys. Comm., fixed formatting problems caused by the arXiv's autotex system
Unidirectional propagation of spin waves excited by femtosecond laser pulses in a planar waveguide
Creators: name: Gerevenkov, P. I.
name: Filatov, Ia. A.
name: Kalashnikova, A. M.
name: Khokhlov, N. E.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Low-energy magnonic logic circuits are an actively developing field of modern magnetism. The potential benefits of magnonics for data processing are vitally dependent on units based on non-reciprocal propagation of spin waves in analogy to semiconductor diodes and transistors in electronics. In this article, we suggest the approach to realize non-reciprocal propagation of spin waves in a ferromagnetic metallic waveguide by exciting them with femtosecond laser pulse. Using micromagnetic modeling, we show that the combination of an external magnetic field and the position of the excitation laser spot across the waveguide leads to unidirectional propagation of the excited spin-wave packet. The results are crucial for the design of hybrid magnonic-photonic circuits in future generations of data processing devices.
description: 9 pages, 6 figures, 2 supplementary files. The .pdf file: details of simulation, static magnetisation distribution, and waves propagation. The .gif file: evolution of out-of-plane magnetization component distribution of the entire waveguide area at excitation with pulses focused into a round spot. The value of the external magnetic field is 17 mT, the excitation area center position is -1.2 um
Hyper-Dilaton Weyl Multiplets of 5D and 6D Minimal Conformal Supergravity
Creators: name: Hutomo, Jessica
name: Khandelwal, Saurish
name: Tartaglino-Mazzucchelli, Gabriele
name: Woods, Jesse
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: By extending the recent analysis of arXiv:2203.12203 for ${\mathcal{N}}=2$ conformal supergravity in four dimensions, we define new hyper-dilaton Weyl multiplets for five-dimensional ${\mathcal{N}}=1$, and six-dimensional ${\mathcal{N}}=(1,0)$ conformal supergravities. These are constructed by coupling the five- and six-dimensional standard Weyl multiplets to on-shell hypermultiplets and reinterpreting the systems as new multiplets of conformal supergravity. In the five-dimensional case, we also construct a new hyper-dilaton Poincaré supergravity by coupling to an off-shell vector multiplet compensator. As in four dimensions, a $BF$-coupling induces a non-trivial scalar potential for the five-dimensional dilaton that admits AdS$_5$ vacua.
description: 56 pages; v2: minor corrections, version published in PRD
Sample variance in N--body simulations and impact on tomographic shear predictions
Creators: name: Casarini, Luciano
name: Piattella, Oliver
name: Bonometto, Silvio
name: Mezzetti, Marino
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study the effects of sample variance in N--body simulations, as a function of the size of the simulation box, namely in connection with predictions on tomographic shear spectra. We make use of a set of 8 $Λ$CDM simulations in boxes of 128, 256, 512 $h^{-1}$Mpc aside, for a total of 24, differing just by the initial seeds. Among the simulations with 128 and 512 $h^{-1}$Mpc aside, we suitably select those closest and farthest from {\it average}. Numerical and linear spectra $P(k,z)$ are suitably connected at low $k$ so to evaluate the effects of sample variance on shear spectra $C_{ij}(\ell)$ for 5 or 10 tomographic bands. We find that shear spectra obtained by using 128 $h^{-1}$Mpc simulations can vary up to $\sim 25\, \%$, just because of the seed. Sample variance lowers to $\sim 3.3\, \%$, when using 512 $h^{-1}$Mpc. These very percentages could however slightly vary, if other sets of the same number of realizations were considered. Accordingly, in order to match the $\sim 1\, \%$ precision expected for data, if still using 8 boxes, we require a size $\sim 1300$ --$ 1700 \, h^{-1}$ Mpc for them.
description: accepted by ApJ
Simultaneous Configuration Formation and Information Collection by Modular Robotic Systems
Creators: name: Dutta, Ayan
name: Dasgupta, Prithviraj
Publisher: name: arXiv
Year: 2016
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: We consider the configuration formation problem in modular robotic systems where a set of singleton modules that are spatially distributed in an environment are required to assume appropriate positions so that they can configure into a new, user-specified target configuration, while simultaneously maximizing the amount of information collected while navigating from their initial to final positions. Each module has a limited energy budget to expend while moving from its initial to goal location. To solve this problem, we propose a budget-limited, heuristic search-based algorithm that finds a path that maximizes the entropy of the expected information along the path. We have analytically proved that our proposed approach converges within finite time. Experimental results show that our planning approach has lower run-time than an auction-based allocation algorithm for selecting modules' spots.
Probing Quantum Gravity with Elastic Interactions of Ultra-High-Energy Neutrinos
Creators: name: Soto, Alfonso Garcia
name: Garg, Diksha
name: Reno, Mary Hall
name: Argüelles, Carlos A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The next generation of radio telescopes will be sensitive to low-scale quantum gravity by measuring ultra-high-energy neutrinos. In this letter, we demonstrate for the first time that neutrino-nucleon soft interactions induced by TeV-scale gravity would significantly increase the number of events detected by the IceCube-Gen2 radio array in the EeV regime. However, we show that these experiments cannot measure the total cross section using only the angular and energy information of the neutrino flux, unless assumptions on the underlying inelasticity distribution of neutral interactions are made.
description: 6+3 pages. 3+3 figures. 1 table. Updated to match published version
Desch-Schappacher Perturbation of One-Parameter Semigroups on Locally Convex Spaces
Creators: name: Jacob, Birgit
name: Wegner, Sven-Ake
name: Wintermayr, Jens
Publisher: name: arXiv
Year: 2014
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics

description: We prove a Desch-Schappacher type perturbation theorem for strongly continuous and locally equicontinuous one-parameter semigroups which are defined on a sequentially complete locally convex space.
description: 10 pages, revised argument in section 2, results unchanged (proof of Theorem 1, the closedness of operator C)
An unconditionally stable finite element scheme for anisotropic curve shortening flow
Creators: name: Deckelnick, Klaus
name: Nürnberg, Robert
Publisher: name: arXiv
Year: 2022
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65M60, 65M12, 53E10, 35K15

description: Based on a recent novel formulation of parametric anisotropic curve shortening flow, we analyse a fully discrete numerical method of this geometric evolution equation. The method uses piecewise linear finite elements in space and a backward Euler approximation in time. We establish existence and uniqueness of a discrete solution, as well as an unconditional stability property. Some numerical computations confirm the theoretical results and demonstrate the practicality of our method.
description: 13 pages, 4 figures
A Portfolio Approach to Grain Marketing and Crop Insurance Strategies for an Indiana Case Farm
Creators: name: Lenfestey, Gloria N
Publisher: name: Purdue University Graduate School
Year: 2023
Subjects: classificationCode: 300208
subject: Farm management, rural management and agribusiness
classificationCode: 380101
subject: Agricultural economics

description: While many studies have evaluated corn and soybean marketing strategies and crop insurance coverage levels separately, few studies have examined their interactions simultaneously. This study evaluated the risk return tradeoff between marketing and crop insurance strategies in a portfolio context. The Target MOTAD model was the primary method used to explore the tradeoffs between expected returns and downside risk. On average, the hedge and roll strategy had the highest net return over the 30-year period for both corn and soybeans. When corn and soybeans were evaluated separately, results indicated that the optimal combination of marketing strategies was not dependent on crop insurance coverage levels. The strategies contributing to an optimal portfolio for corn were a mixture of the hedge and roll strategy, and the marketing year cash price strategy. Combining the hedge and roll strategy with the marketing year cash price strategy was also optimal for soybeans. When corn and soybean strategies were optimized simultaneously, however, optimal marketing strategies were dependent on the crop insurance coverage level chosen. The optimal marketing strategies to mitigate risk for the 75 and 80 percent revenue protection plan included the corn hedge and roll strategy, the soybean marketing year cash price strategy, and the soybean six-month cash price strategy. For the 85 percent revenue protection plan, the optimal marketing strategies were the corn hedge and roll strategy, soybean marketing year cash price strategy, and the soybean hedge and roll strategy. For the 90 and 95 percent supplemental coverage option (SCO) and enhanced coverage option (ECO) plans, the optimal marketing strategies were the corn marketing year cash price, the corn hedge and roll, and the soybean six-month cash price strategy.
On dynamical systems perturbed by a null-recurrent fast motion: The continuous coefficient case with independent driving noises
Creators: name: Pajor-Gyulai, Zsolt
name: Salins, Michael
Publisher: name: arXiv
Year: 2014
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60H10, 60J60, 60F05

description: An ordinary differential equation perturbed by a null-recurrent diffusion will be considered in the case where the averaging type perturbation is strong only when a fast motion is close to the origin. The normal deviations of these solutions from the averaged motion are studied, and a central limit type theorem is proved. The limit process satisfies a linear equation driven by a Brownian motion time changed by the local time of the fast motion.
description: 15 pages, 1 figure Corollary 2.4 fixed
Efimov Physics: a review
Creators: name: Naidon, Pascal
name: Endo, Shimpei
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Nuclear Theory (nucl-th)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: This article reviews theoretical and experimental advances in Efimov physics, an array of quantum few-body and many-body phenomena arising for particles interacting via short-range resonant interactions, that is based on the appearance of a scale-invariant three-body attraction theoretically discovered by Vitaly Efimov in 1970. This three-body effect was originally proposed to explain the binding of nuclei such as the triton and the Hoyle state of carbon-12, and later considered as a simple explanation for the existence of some halo nuclei. It was subsequently evidenced in trapped ultra-cold atomic clouds and in diffracted molecular beams of gaseous helium. These experiments revealed that the previously undetermined three-body parameter introduced in the Efimov theory to stabilise the three-body attraction typically scales with the range of atomic interactions. The few- and many-body consequences of the Efimov attraction have been since investigated theoretically, and are expected to be observed in a broader spectrum of physical systems.
description: 97 pages, 31 figures. Corrected a few errors
Young Graphs: 1089 et al
Creators: name: Kendrick, L. H.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Number Theory (math.NT)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 11A63

description: This paper deals with those positive integers N such that, for given integers g and k with 1< k
description: 23 pages, 6 figures. New version accounts for expansions and revisions of Holt's work in its commentary. A conjecture has become a result, the examples section is revised, a few footnotes are modified, some equivalence class terminology is slightly changed, the acknowledgments section is expanded, and a number of stylistic and typographical errors and choices are repaired
A. Stern's analysis of the nodal sets of some families of spherical harmonics revisited
Creators: name: Bérard, Pierre
name: Helffer, Bernard
Publisher: name: arXiv
Year: 2014
Subjects: subject: Differential Geometry (math.DG)
subject: Spectral Theory (math.SP)
subject: FOS: Mathematics

description: In this paper, we revisit the analyses of Antonie Stern (1925) and Hans Lewy (1977) devoted to the construction of spherical harmonics with two or three nodal domains. Our method yields sharp quantitative results and a better understanding of the occurrence of bifurcations in the families of nodal sets.This paper is a natural continuation of our critical reading of A. Stern's results for Dirichlet eigenfunctions in the square, see arXiv:14026054.
description: Accepted for publication in "Monatshefte f{\"u}r Mathematik"