cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Activity induced first order transition for the current in a disordered medium
Creators: name: Demaerel, T.
name: Maes, C.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: It is well known that particles can get trapped by randomly placed obstacles when they are pushed too much. We present a model where the current in a disordered medium dies at a large external field, but is reborn when the activity is increased. By activity we mean the time-variation of the external driving at a constant time-averaged field. A different interpretation of the resurgence of the current is that the particles are capable of taking an infinite sequence of potential barriers via a mechanism similar to stochastic resonance. We add a discussion regarding the role of "shaking" in processes of relaxation.
description: 13 pages, 12 figures
Cantino, V. "Valore d’impresa e merito creditizio. Il rating”, 2002
Creators: name: Bocchino, Umberto
Publisher: name: Department of Economics and Business Studies, University of Genoa
Year: 2023
Subjects: Accounting and Business Adm.

description: Umberto Bocchino presenta il libro di Valter Cantino “Valore d’impresa e merito creditizio. Il rating”, pubblicato nel 2002 dall’Editore Giuffrè, richiamandone spunti utili ad illustrare l’apertura mentale e la visione scientifica dell’Autore insieme ad aspetti, valutazioni e chiavi di lettura tuttora di grande attualità. Alla presentazione fa seguito la riproduzione dei primi paragrafi del capitole del libro dedicato a “I giudizi di valore sull’impresa”.
Critical level crossings and gapless spin liquid in the square-lattice spin-$1/2$ $J_1$-$J_2$ Heisenberg antiferromagnet
Creators: name: Wang, Ling
name: Sandvik, Anders W.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We use the DMRG method to calculate several energy eigenvalues of the frustrated $S=1/2$ square-lattice $J_1$-$J_2$ Heisenberg model on $2L \times L$ cylinders with $L \le 10$. We identify excited-level crossings versus the coupling ratio $g=J_2/J_1$ and study their drifts with the system size $L$. The lowest singlet-triplet and singlet-quintuplet crossings converge rapidly (with corrections $\propto L^{-2}$) to different $g$ values, and we argue that these correspond to ground-state transitions between the Néel antiferromagnet and a gapless spin liquid, at $g_{c1} \approx 0.46$, and between the spin liquid and a valence-bond-solid at $g_{c2} \approx 0.52$. Previous studies of order parameters were not able to positively discriminate between an extended spin liquid phase and a critical point. We expect level-crossing analysis to be a generically powerful tool in DMRG studies of quantum phase transitions.
description: 14 pages 16 figs, accepted by PRL
Gender, subjectivity and feminist art: the work of Tracey Emin, Sam Taylor-Wood and Gillian Wearing
Creators: name: Kappel, Stefanie
Publisher: name: University of Westminster
Year: 2007

description: This thesis provides a missing link between the British feminist art movement from the 1970s onwards and three contemporary female artists, namely Tracey Emin, Gillian Wearing and Sam Taylor-Wood. The dissertation demonstrates the influence that feminist art has had on contemporary women's art. It shows how various elements, typically associated with feminist art from a previous generation of female artists. have been either consciously or unconsciously incorporated into the way the three artists in question approach their work. The ideas. concerns and ways of working of a previous generation of feminist artists are discussed in relation to gender politics, the idea of the traditional male "genius", the question of feminist art practice, the role of the female body, performance versus performativity and the representation of women in visual culture. The contemporary work is discussed in relation to the above issues, drawing out comparisons to feminist art practice where appropriate. The thesis also contextualises Tracey Emin, Gillian Wearing and Sam Taylor-Wood within the generation of the Young British Artists (YBAs) of the 1990s. Here it focuses on ideas such as self-promotion versus patronage, the particular sensationalist art practice of the YBAs, the problematic attitude towards cultural theory and finally, it demonstrates how women artists of that particular period tended to work. The dissertation does not aim to present a comprehensive survey of all feminist visual arts activity in Britain and North America, the geographical locations of interest for this thesis, nor is it an all encompassing art historical overview of the activities in London, during the 1990s. The thesis should be understood as a celebration of the significance of the feminist art movement and as a demonstration of the validity of many of its concerns, even today, as exemplified in the work of the three artists in question.
Density of States FFA analysis of SU(3) lattice gauge theory at a finite density of color sources
Creators: name: Giuliani, Mario
name: Gattringer, Christof
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a Density of States calculation with the Functional Fit Approach (DoS FFA) in SU(3) lattice gauge theory with a finite density of static color sources. The DoS FFA uses a parameterized density of states and determines the parameters of the density by fitting data from restricted Monte Carlo simulations with an analytically known function. We discuss the implementation of DoS FFA and the results for a qualitative picture of the phase diagram in a model which is a further step towards implementing DoS FFA in full QCD. We determine the curvature $κ$ in the $μ$-$T$ phase diagram and find a value close to the results published for full QCD.
description: One figure added, as well as comments on: Monte Carlo simulation, discretization effects, volume dependence, density integral. Final version to appear in Phys. Lett. B
Global and local thermometry schemes in coupled quantum systems
Creators: name: Campbell, Steve
name: Mehboudi, Mohammad
name: De Chiara, Gabriele
name: Paternostro, Mauro
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We study the ultimate bounds on the estimation of temperature for an interacting quantum system. We consider two coupled bosonic modes that are assumed to be thermal and using quantum estimation theory establish the role the Hamiltonian parameters play in thermometry. We show that in the case of a conserved particle number the interaction between the modes leads to a decrease in the overall sensitivity to temperature, while interestingly, if particle exchange is allowed with the thermal bath the converse is true. We explain this dichotomy by examining the energy spectra. Finally, we devise experimentally implementable thermometry schemes that rely only on locally accessible information from the total system, showing that almost Heisenberg limited precision can still be achieved, and we address the (im)possibility for multiparameter estimation in the system.
description: 16 pages, 5 figures. Close to published version
Efficient isogeometric thin shell formulations for soft biological materials
Creators: name: Roohbakhshan, Farshad
name: Sauer, Roger A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: This paper presents three different constitutive approaches to model thin rotation-free shells based on the Kirchhoff-Love hypothesis. One approach is based on numerical integration through the shell thickness while the other two approaches do not need any numerical integration and so they are computationally more efficient. The formulation is designed for large deformations and allows for geometrical and material nonlinearities, which makes it very suitable for the modeling of soft tissues. Furthermore, six different isotropic and anisotropic material models, which are commonly used to model soft biological materials, are examined for the three proposed constitutive approaches. Following an isogeometric approach, NURBS-based finite elements are used for the discretization of the shell surface. Several numerical examples are investigated to demonstrate the capabilities of the formulation. Those include the contact simulation during balloon angioplasty.
description: Typos are removed. Remark 3.4 is added. Eq. (18) in the previous version is removed. Thus, the equations get renumbered. Example 5.5 is updated. Minor typos in Eqs. (17), (80), (145) and (146), are corrected. They do not affect the results
Rigidity of powers and Kosniowski's conjecture
Creators: name: Lü, Zhi
name: Musin, Oleg R.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Algebraic Topology (math.AT)
subject: Combinatorics (math.CO)
subject: General Topology (math.GN)
subject: FOS: Mathematics

description: In this paper we state a problem on rigidity of powers, which has a strong topological background for the rigid Hirzebruch genera and Kosniowski's conjecture of unitary circle actions. However, our statement of this problem is elementary enough and does not require any knowledge of algebraic topology. We shall give a solution of this problem for some particular cases. As a consequence, we obtain that Kosniowski's conjecture holds in the case of dimension less than 11 or equal to 14.
description: 10 pages
Perturbative unitarity of Lee-Wick quantum field theory
Creators: name: Anselmi, Damiano
name: Piva, Marco
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study the perturbative unitarity of the Lee-Wick models, formulated as nonanalytically Wick rotated Euclidean theories. The complex energy plane is divided into disconnected regions and the values of a loop integral in the various regions are related to one another by a nonanalytic procedure. We show that the one-loop diagrams satisfy the expected, unitary cutting equations in each region: only the physical degrees of freedom propagate through the cuts. The goal can be achieved by working in suitable subsets of each region and proving that the cutting equations can be analytically continued as a whole. We make explicit calculations in the cases of the bubble and triangle diagrams and address the generality of our approach. We also show that the same higher-derivative models violate unitarity if they are formulated directly in Minkowski spacetime.
description: 30 pages, 15 figures; v2: more details and comments on generality of approach; v3: minor changes, PRD
Cantino V., “Management Information Systems”, 2005
Creators: name: Busso, Donatella
name: Culasso, Francesca
Publisher: name: Department of Economics and Business Studies, University of Genoa
Year: 2023
Subjects: Accounting and Business Adm.

description: Donatella Busso e Francesca Culasso presentano il percorso di ricerca di Valter Cantino nel campo dei Sistemi Informativi Aziendali, e nello specifico illustrano il libro da Lui curato, intitolato “Management Information Systems” e pubblicato nel 2005 da McGraw-Hill.

La prefazione al testo è piuttosto illuminante rispetto alla lucidità che il prof. Cantino mostrava di possedere di fronte ai fenomeni complessi tipici del sistema aziendale e del suo contesto di riferimento, con una particolare predilezione per il mondo dell’innovazione e dell’ICT in generale, quale fonte di supporto ai processi operativi e a quelli decisionali del management.
Regeneration of actin filament branches from the same Arp2/3 complex.
Creators: name: Ghasemi, Foad
name: Cao, LuYan
name: Mladenov, Miroslav
name: Guichard, Bérengère
name: Way, Michael
name: Jégou, Antoine
name: Romet-Lemonne, Guillaume
Publisher: name: The Francis Crick Institute
Year: 2024
Subjects: classificationCode: Signalling & Oncogenes
subject: Signalling & Oncogenes
classificationCode: Infectious Disease
subject: Infectious Disease
classificationCode: Model organisms
subject: Model organisms
classificationCode: Biochemistry & Proteomics
subject: Biochemistry & Proteomics
classificationCode: Cell Biology
subject: Cell Biology
classificationCode: Imaging
subject: Imaging

description: Branched actin filaments are found in many key cellular structures. Branches are nucleated by the Arp2/3 complex activated by nucleation-promoting factor (NPF) proteins and bound to the side of preexisting "mother" filaments. Over time, branches dissociate from their mother filament, leading to network reorganization and turnover, but this mechanism is less understood. Here, using microfluidics and purified proteins, we examined the dissociation of individual branches under controlled biochemical and mechanical conditions. We observe that the Arp2/3 complex remains bound to the mother filament after most debranching events, even when accelerated by force. Strikingly, this surviving Arp2/3 complex readily nucleates a new actin filament branch, without being activated anew by an NPF: It simply needs to exchange its nucleotide and bind an actin monomer. The protein glia maturation factor (GMF), which accelerates debranching, prevents branch renucleation. Our results suggest that actin filament renucleation can provide a self-repair mechanism, helping branched networks to sustain mechanical stress in cells over extended periods of time.
Parsec-scale Faraday rotation and polarization of 20 active galactic nuclei jets
Creators: name: Kravchenko, E. V.
name: Kovalev, Y. Y.
name: Sokolovsky, K. V.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We perform polarimetry analysis of 20 active galactic nuclei (AGN) jets using the Very Long Baseline Array (VLBA) at 1.4, 1.6, 2.2, 2.4, 4.6, 5.0, 8.1, 8.4, and 15.4 GHz. The study allowed us to investigate linearly polarized properties of the jets at parsec-scales: distribution of the Faraday rotation measure (RM) and fractional polarization along the jets, Faraday effects and structure of Faraday-corrected polarization images. Wavelength-dependence of the fractional polarization and polarization angle is consistent with external Faraday rotation, while some sources show internal rotation. The RM changes along the jets, systematically increasing its value towards synchrotron self-absorbed cores at shorter wavelengths. The highest core RM reaches 16,900 rad/m^2 in the source rest frame for the quasar 0952+179, suggesting the presence of highly magnetized, dense media in these regions. The typical RM of transparent jet regions has values of an order of a hundred rad/m^2. Significant transverse rotation measure gradients are observed in seven sources. The magnetic field in the Faraday screen has no preferred orientation, and is observed to be random or regular from source to source. Half of the sources show evidence for the helical magnetic fields in their rotating magnetoionic media. At the same time jets themselves contain large-scale, ordered magnetic fields and tend to align its direction with the jet flow. The observed variety of polarized signatures can be explained by a model of spine-sheath jet structure.
description: 19 pages, 8 figures, 9 tables; published by MNRAS; full versions of the table 3 and figures 2, 5 and 8 are available in the journal version of the paper
title: Extending the ice core record beyond half a million years
Creators: name: The EPICA Dome C 2001-02 Science and Drilling Teams
Publisher: name: :unas
Year: 2002

description: Ice cores have been a crucial source of information about past changes in the climate and atmosphere. The Vostok ice core from Antarctica has provided key global change data sets extending 400,000 years in the past [Petit et al., 1999], while Japanese scientists drilling at Dome Fuji have obtained records extending to 330,000 years. Now, a new core being drilled by a consortium of European laboratories has surpassed these ages, and looks like extending the ice core record several hundred thousand years into the past.

Ice cores are unique: of all the paleo-records, they have the most direct linkage with the atmosphere. At some sites, the time resolution is sufficient to study extremely fast climate changes; and they have information about many forcing factors for climate (including greenhouse gas concentrations) displayed in the same cores as the resulting climate changes.
Local-duality QCD sum rules for strong isospin breaking in the decay constants of heavy-light mesons
Creators: name: Lucha, Wolfgang
name: Melikhov, Dmitri
name: Simula, Silvano
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss the leptonic decay constants of heavy--light mesons by means of Borel QCD sum~rules in the local-duality (LD) limit of infinitely large Borel mass parameter. In this limit, for an appropriate choice of the invariant structures in the QCD correlation functions, all vacuum-condensate contributions vanish and all nonperturbative effects are contained in only one quantity, the effective threshold. We study properties of the LD effective thresholds in the limits of large heavy-quark mass $m_Q$ and small light-quark mass $m_q$. In the heavy-quark limit, we clarify the role played by the radiative corrections in the effective threshold for reproducing the pQCD expansion of the decay constants of pseudoscalar and vector mesons. We show that the dependence of the meson decay constants on $m_q$ arises predominantly (at the level of 70--80%) from the calculable $m_q$-dependence of the perturbative spectral densities. Making use of the lattice QCD results for the decay constants of nonstrange and strange pseudoscalar and vector heavy mesons, we obtain solid predictions for the decay constants of heavy--light mesons as functions of $m_q$ in the range from a few to 100 MeV and evaluate the corresponding strong isospin-breaking effects: $f_{D^+} - f_{D^0}=(0.96 \pm 0.09) ~ {\rm MeV}$, $f_{D^{*+}} - f_{D^{*0}}= (1.18 \pm 0.35) ~ {\rm MeV}$, $f_{B^0} - f_{B^+}=(1.01 \pm 0.10) ~ {\rm MeV}$, $f_{B^{*0}} - f_{B^{*+}}=(0.89 \pm 0.30) ~ {\rm MeV}$.
description: 14 pages. Typo corrected: the term describing power corrections in Eq.(1.1), which was lost when updating v2 -> v3, is restored. Notice that this term is also lost in the EPJC version (to be corrected via Erratum)
How nonperturbative is the infrared regime of Landau gauge Yang-Mills correlators?
Creators: name: Reinosa, Urko
name: Serreau, Julien
name: Tissier, Matthieu
name: Wschebor, Nicolás
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We study the Landau gauge correlators of Yang-Mills fields for infrared Euclidean momenta in the context of a massive extension of the Faddeev-Popov Lagrangian which, we argue, underlies a variety of continuum approaches. Standard (perturbative) renormalization group techniques with a specific, infrared-safe renormalization scheme produce so-called decoupling and scaling solutions for the ghost and gluon propagators, which correspond to nontrivial infrared fixed points. The decoupling fixed point is infrared stable and weakly coupled, while the scaling fixed point is unstable and generically strongly coupled except for low dimensions $d\to2$. Under the assumption that such a scaling fixed point exists beyond one-loop order, we find that the corresponding ghost and gluon scaling exponents are, respectively, $2α_F=2-d$ and $2α_G=d$ at all orders of perturbation theory in the present renormalization scheme. We discuss the relation between the ghost wave function renormalization, the gluon screening mass, the scale of spectral positivity violation, and the gluon mass parameter. We also show that this scaling solution does not realize the standard Becchi-Rouet-Stora-Tyutin symmetry of the Faddeev-Popov Lagrangian. Finally, we discuss our findings in relation to the results of nonperturbative continuum methods.
description: 20 pages, 13 figures, published version (PRD)
Dirichlet's and Thomson's principles for non-selfadjoint elliptic operators with application to non-reversible metastable diffusion processes
Creators: name: Landim, C.
name: Mariani, M.
name: Seo, I.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Probability (math.PR)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We present two variational formulae for the capacity in the context of non-selfadjoint elliptic operators. The minimizers of these variational problems are expressed as solutions of boundary-value elliptic equations. We use these principles to provide a sharp estimate for the transition times between two different wells for non-reversible diffusion processes. This estimate permits to describe the metastable behavior of the system.
Eruptive Massive Vector Particles of 5-Dimensional Kerr-Gödel Spacetime
Creators: name: Övgün, A.
name: Sakalli, I.
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this paper, we investigate Hawking radiation of massive spin-1 particles from 5-dimensional Kerr-Gödel spacetime. By applying the WKB approximation and the Hamilton-Jacobi ansatz to the relativistic Proca equation, we obtain the quantum tunneling rate of the massive vector particles. Using the obtained tunneling rate, we show how one impeccably computes the Hawking temperature of the 5-dimensional Kerr-Gödel spacetime.
description: 5 pages; 2-columns; will appear in International Journal of Theoretical Physics (IJTP)
Preferential uptake of SARS-CoV-2 by pericytes potentiates vascular damage and permeability in an organoid model of the microvasculature
Creators: name: Khan, Abdullah O.
name: Reyat, Jasmeet S.
name: Hill, Harriet
name: Bourne, Joshua H.
name: Colicchia, Martina
name: Newby, Maddy L.
name: Allen, Joel D.
name: Crispin, Max
name: Youd, Esther
name: Murray, Paul
name: Taylor, Graham
name: Stamataki, Zania
name: Richter, Alex G.
name: Cunningham, Adam F.
name: Pugh, Matthew
name: Rayes, Julie
Publisher: name: University of Limerick
Year: 2023
Subjects: subject: Health sciences
subject: FOS: Health sciences

description: Aims: Thrombotic complications and vasculopathy have been extensively associated with severe COVID-19 infection; however, the mechanisms inducing endotheliitis and the disruption of endothelial integrity in the microcirculation are poorly understood. We hypothesized that within the vessel wall, pericytes preferentially take up viral particles and mediate the subsequent loss of vascular integrity. Methods and results: Immunofluorescence of post-mortem patient sections was used to assess pathophysiological aspects of COVID-19 infection. The effects of COVID-19 on the microvasculature were assessed using a vascular organoid model exposed to live viral particles or recombinant viral antigens. We find increased expression of the viral entry receptor angiotensin-converting enzyme 2 on pericytes when compared to vascular endothelium and a reduction in the expression of the junctional protein CD144, as well as increased cell death, upon treatment with both live virus and/or viral antigens. We observe a dysregulation of genes implicated in vascular permeability, including Notch receptor 3, angiopoietin-2, and TEK. Activation of vascular organoids with interleukin-1β did not have an additive effect on vascular permeability. Spike antigen was detected in some patients’ lung pericytes, which was associated with a decrease in CD144 expression and increased platelet recruitment and von Willebrand factor (VWF) deposition in the capillaries of these patients, with thrombi in large vessels rich in VWF and fibrin. Conclusion: Together, our data indicate that direct viral exposure to the microvasculature modelled by organoid infection and viral antigen treatment results in pericyte infection, detachment, damage, and cell death, disrupting pericyte-endothelial cell crosstalk and increasing microvascular endothelial permeability, which can promote thrombotic and bleeding complications in the microcirculation.
Stable dynamics of micro-machined inductive contactless suspensions
Creators: name: Poletkin, Kirill V
name: Lu, Zhiqiu
name: Wallrabe, Ulrike
name: Korvink, Jan
name: Badilita, Vlad
Publisher: name: arXiv
Year: 2017
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: In this article, we present a qualitative approach to study the dynamics and stability of micro-machined inductive contactless suspensions (MIS). In the framework of this approach, the induced eddy current into a levitated micro-object is considered as a collection of m-eddy current circuits. Assuming small displacements and the quasi- static behaviour of the levitated micro-object, a generalized model of MIS is obtained and represented as a set of six linear differential equations corresponding to six degrees of freedom in a rigid body by using Lagrange-Maxwell formalism. The linear model allows us to investigate the general stability properties of the MIS as a dynamic system, and these properties are synthesized in three major theorems. In particular, we prove that the stable levitation in the MIS without damping is impossible. Based on the approach presented herewith, we give general guidelines for MIS designing. In addition to we demonstrate the successful application of this technique to study the dynamics and stability of the symmetric and axially symmetric MIS designs both based on 3D micro-coil technology.
description: 39 pages, 11 figures
Complex analogues of the half-classical geometry
Creators: name: Banica, Teodor
name: Bichon, Julien
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics

description: Under very strong axioms, there is precisely one real noncommutative geometry between the classical one and the free one, namely the half-classical one, coming from the relations $abc=cba$. We discuss here the complex analogues of this geometry, notably with a study of the geometry coming from the commutation relations between all the variables $\{ab^*,a^*b\}$, that we believe to be the "correct" one.
description: 26 pages
The Chamber Ansatz for quantum unipotent cells
Creators: name: Oya, Hironori
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Algebra (math.QA)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 17B37, 20G42, 13F60

description: In this paper, we prove quantum analogues of the Chamber Ansatz formulae for unipotent cells. These formulae imply that the quantum twist automorphisms, constructed by Kimura and the author, are generalizations of Berenstein-Rupel's quantum twist automorphisms for unipotent cells associated with the squares of acyclic Coxeter elements. This conclusion implies that the known compatibility between quantum twist automorphisms and dual canonical bases corresponds to the property conjectured by Berenstein and Rupel.
description: v1: 17 pages, v2: 22pages. We have attached an appendix in which the explicit relation between the Feigin maps and the quantum torus embeddings given by Cauchon generators is explained. Remark 3.6 and Corollary 3.7 have been detailed. To appear in Transformation Groups
The complexity of the embeddability relation between torsion-free abelian groups of uncountable size
Creators: name: Calderoni, Filippo
Publisher: name: arXiv
Year: 2017
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 03E15, 20K20, 20K40

description: We prove that for every uncountable cardinal $κ$ such that $κ^{
description: 14 pages, final version
Numerically Modeling the First Peak of the Type IIb SN 2016gkg
Creators: name: Piro, Anthony L.
name: Muhleisen, Marc
name: Arcavi, Iair
name: Sand, David J.
name: Tartaglia, Leonardo
name: Valenti, Stefano
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Many Type IIb supernovae (SNe) show a prominent additional early peak in their light curves, which is generally thought to be due to the shock cooling of extended hydrogen-rich material surrounding the helium core of the exploding star. The recent SN 2016gkg was a nearby Type IIb SN discovered shortly after explosion, which makes it an excellent candidate for studying this first peak. We numerically explode a large grid of extended envelope models and compare these to SN 2016gkg to investigate what constraints can be derived from its light curve. This includes exploring density profiles for both a convective envelope and an optically thick steady-state wind, the latter of which has not typically been considered for Type IIb SNe models. We find that roughly $\sim0.02\,M_\odot$ of extended material with a radius of $\approx180-260\,R_\odot$ reproduces the photometric light curve data, consistent with pre-explosion imaging. These values are independent of the assumed density profile of this material, although a convective profile provides a somewhat better fit. We infer from our modeling that the explosion must have occurred within $\approx2-3\,{\rm hrs}$ of the first observed data point, demonstrating that this event was caught very close to the moment of explosion. Nevertheless, our best-fitting one-dimensional models overpredict the earliest velocity measurements, which suggests that the hydrogen-rich material is not distributed in a spherically symmetric manner. We compare this to the asymmetries seen in the SN IIb remnant Cas A, and we discuss the implications of this for Type IIb SN progenitors and explosion models.
description: 8 pages, 8 figures, updated version accepted for publication in The Astrophysical Journal
Experimental Constraint on an Exotic Spin- and Velocity-Dependent Interaction in the Sub-meV Range of Axion Mass with a Spin-Exchange Relaxation-Free Magnetometer
Creators: name: Kim, Young Jin
name: Chu, Ping-Han
name: Savukov, Igor
Publisher: name: arXiv
Year: 2017
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We conducted a search for an exotic spin- and velocity-dependent interaction for polarized electrons with an experimental approach based on a high-sensitivity spin-exchange relaxation-free (SERF) magnetometer, which serves as both a source of polarized electrons and a magnetic-field sensor. The experiment aims to sensitively detect magnetic-fieldlike effects from the exotic interaction between the polarized electrons in a SERF vapor cell and unpolarized nucleons of a closely located solid-state mass. We report experimental results on the interaction with 82 h of data averaging, which sets an experimental limit on the coupling strength around $10^{-19}$ for the axion mass $m_a \lesssim 10^{-3}$ eV, within the important axion window.
Polychromatic Colorings on the Integers
Creators: name: Axenovich, Maria
name: Goldwasser, John
name: Lidický, Bernard
name: Martin, Ryan R.
name: Offner, David
name: Talbot, John
name: Young, Michael
Publisher: name: arXiv
Year: 2017
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: We show that for any set $S\subseteq \mathbb{Z}$, $|S|=4$ there exists a 3-coloring of $\mathbb{Z}$ in which every translate of $S$ receives all three colors. This implies that $S$ has a codensity of at most $1/3$, proving a conjecture of Newman [D. J. Newman, Complements of finite sets of integers, Michigan Math. J. 14 (1967) 481--486]. We also consider related questions in $\mathbb{Z}^d$, $d\geq 2$.
description: 16 pages, improved presentation
3D quantum Hall effect of Fermi arcs in topological semimetals
Creators: name: Wang, C. M.
name: Sun, Hai-Peng
name: Lu, Hai-Zhou
name: Xie, X. C.
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: The quantum Hall effect is usually observed in 2D systems. We show that the Fermi arcs can give rise to a distinctive 3D quantum Hall effect in topological semimetals. Because of the topological constraint, the Fermi arc at a single surface has an open Fermi surface, which cannot host the quantum Hall effect. Via a "wormhole" tunneling assisted by the Weyl nodes, the Fermi arcs at opposite surfaces can form a complete Fermi loop and support the quantum Hall effect. The edge states of the Fermi arcs show a unique 3D distribution, giving an example of (d-2)-dimensional boundary states. This is distinctly different from the surface-state quantum Hall effect from a single surface of topological insulator. As the Fermi energy sweeps through the Weyl nodes, the sheet Hall conductivity evolves from the 1/B dependence to quantized plateaus at the Weyl nodes. This behavior can be realized by tuning gate voltages in a slab of topological semimetal, such as the TaAs family, Cd$_3$As$_2$, or Na$_3$Bi. This work will be instructive not only for searching transport signatures of the Fermi arcs but also for exploring novel electron gases in other topological phases of matter.
description: 5 pages, 3 figures
Level compressibility for the Anderson model on regular random graphs and the eigenvalue statistics in the extended phase
Creators: name: Metz, Fernando L.
name: Castillo, Isaac Pérez
Publisher: name: arXiv
Year: 2017
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We calculate the level compressibility $χ(W,L)$ of the energy levels inside $[-L/2,L/2]$ for the Anderson model on infinitely large random regular graphs with on-site potentials distributed uniformly in $[-W/2,W/2]$. We show that $χ(W,L)$ approaches the limit $\lim_{L \rightarrow 0^+} χ(W,L) = 0$ for a broad interval of the disorder strength $W$ within the extended phase, including the region of $W$ close to the critical point for the Anderson transition. These results strongly suggest that the energy levels follow the Wigner-Dyson statistics in the extended phase, consistent with earlier analytical predictions for the Anderson model on an Erdös-Rényi random graph. Our results are obtained from the accurate numerical solution of an exact set of equations valid for infinitely large regular random graphs.
description: 7 pages, 3 figures
Definition of Polaritonic Fluctuations in Natural Hyperbolic Media: Applications to Hexagonal Boron Nitride, Bismuth Selenide and the Spontaneous Emission Sum Rule
Creators: name: Molesky, Sean
name: Jacob, Zubin
Publisher: name: arXiv
Year: 2017
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The discovery of photonic hyperbolic dispersion surfaces in certain van der Waals bonded solids, such as hexagonal boron nitride and bismuth selenide (a topological insulator), offers intriguing possibilities for creating strongly modified light-matter interactions. However, open problems exist in quantifying electromagnetic field fluctuations in these media, complicating typical approaches for modeling photonic characteristics. Here, we address this issue by linking the identifying traits of hyperbolic response to a coupling between longitudinal and transverse fields that can not occur in isotropic media. This description allows us to calculate the influence of hyperbolic response on electromagnetic fluctuations without explicitly imposing a characteristic size (model of nonlocality), leading to formally bounded expressions so long as material absorption is included. We then apply this framework to two exemplary areas: the optical sum rule for modified spontaneous emission enhancement in a general uniaxial medium, and thermal electromagnetic field fluctuations in hexagonal boron nitride and bismuth selenide. We find that while the sum rule is satisfied, it does not constrain the enhancement of light-matter interactions in either case. We also show that both hexagonal boron nitride and bismuth selenide possess broad spectral regions where the magnitude of electromagnetic field fluctuations are over 120 times larger, and over 800 times larger along specific angular directions, than they are in vacuum.
description: 14 pages, 7 figures
$μ$-Hybrid Inflation with Low Reheat Temperature and Observable Gravity Waves
Creators: name: Rehman, Mansoor Ur
name: Shafi, Qaisar
name: Vardag, Fariha K.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In $μ$-hybrid inflation a nonzero inflaton vacuum expectation value induced by supersymmetry breaking is proportional to the gravitino mass $m_{3/2}$, which can be exploited to resolve the minimal supersymmetric standard model $μ$ problem. We show how this scenario can be successfully implemented with $m_{3/2} \sim 1-100$ TeV and reheat temperature as low as $10^6$ GeV by employing a minimal renormalizable superpotential coupled with a well defined non-minimal Kähler potential. The tensor-to-scalar ratio $r$, a canonical measure of primordial gravity waves in most cases is less than or of the order of $10^{-6}-10^{-3}$.
description: 19 pages, 6 figures, published version
Gamma-Ray Puzzles in Cygnus X: Implications for High-Energy Neutrinos
Creators: name: Yoast-Hull, Tova M.
name: Gallagher, John S.
name: Halzen, Francis
name: Kheirandish, Ali
name: Zweibel, Ellen G.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The Cygnus X region contains giant molecular cloud complexes and populous associates of massive young stars. The discovery of spatially extended, hard gamma-ray emission in Cygnus X by both Milagro and Fermi indicates that Cygnus X is also a potential source of high-energy Galactic neutrinos. Here, we adapt our single-zone model for cosmic ray interactions in the central molecular zones of starburst galaxies for use in Cygnus X. We calculate the potential neutrino flux corresponding to the hard gamma-ray emission from the "Cygnus Cocoon" and to the soft, diffuse interstellar gamma-ray emission. We check our results by comparing the corresponding gamma-ray emission against the Fermi interstellar emission model and Milagro, ARGO-YBJ, and HAWC observations. In comparing our results against a recent IceCube analysis and the current sensitivity limits, we find that neutrino emission from the Cocoon has a large enough flux that it could plausibly be detected, provided hadronic interactions are occurring at sufficiently high energies. High-energy neutrinos from Cygnus X would provide direct evidence for the presence of as yet unidentified PeV energy accelerators in the Galactic disk.
description: accepted for publication in Phys Rev D, 9 pages, 5 figures
Exploring the climate of Proxima B with the Met Office Unified Model
Creators: name: Boutle, Ian A.
name: Mayne, Nathan J.
name: Drummond, Benjamin
name: Manners, James
name: Goyal, Jayesh
name: Lambert, F. Hugo
name: Acreman, David M.
name: Earnshaw, Paul D.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present results of simulations of the climate of the newly discovered planet Proxima Centauri B, performed using the Met Office Unified Model (UM). We examine the responses of both an `Earth-like' atmosphere and simplified nitrogen and trace carbon dioxide atmosphere to the radiation likely received by Proxima Centauri B. Additionally, we explore the effects of orbital eccentricity on the planetary conditions using a range of eccentricities guided by the observational constraints. Overall, our results are in agreement with previous studies in suggesting Proxima Centauri B may well have surface temperatures conducive to the presence of liquid water. Moreover, we have expanded the parameter regime over which the planet may support liquid water to higher values of eccentricity (>= 0.1) and lower incident fluxes (881.7 Wm-2) than previous work. This increased parameter space arises because of the low sensitivity of the planet to changes in stellar flux, a consequence of the stellar spectrum and orbital configuration. However, we also find interesting differences from previous simulations, such as cooler mean surface temperatures for the tidally-locked case. Finally, we have produced high resolution planetary emission and reflectance spectra, and highlight signatures of gases vital to the evolution of complex life on Earth (oxygen, ozone and carbon dioxide).
description: Astronomy and Astrophysics, in press
Beyond perturbation 1: de Rham spaces
Creators: name: Borisov, Dennis
name: Kremnizer, Kobi
Publisher: name: arXiv
Year: 2017
Subjects: subject: Differential Geometry (math.DG)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 53B99 53C05

description: It is shown that if one uses the notion of infinity nilpotent elements due to Moerdijk and Reyes, instead of the usual definition of nilpotents to define reduced $C^\infty$-schemes, the resulting de Rham spaces are given as quotients by actions of germs of diagonals, instead of the formal neighbourhoods of the diagonals.
description: Difference from the published version: formulation of Proposition 9 is corrected, a footnote and a reference are added
Scaling of graphene field-effect transistors supported on hexagonal boron nitride: radio-frequency stability as a limiting factor
Creators: name: Feijoo, Pedro C.
name: Pasadas, Francisco
name: Iglesias, José M.
name: Martín, María J.
name: Rengel, Raúl
name: Li, Changfeng
name: Kim, Wonjae
name: Riikonen, Juha
name: Lipsanen, Harri
name: Jiménez, David
Publisher: name: arXiv
Year: 2017
Subjects: subject: Applied Physics (physics.app-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The quality of graphene in nanodevices has increased hugely thanks to the use of hexagonal boron nitride as a supporting layer. This paper studies to which extent hBN together with channel length scaling can be exploited in graphene field effect transistors (GFETs) to get a competitive radio frequency (RF) performance. Carrier mobility and saturation velocity were obtained from an ensemble Monte Carlo simulator that accounted for the relevant scattering mechanisms (intrinsic phonons, scattering with impurities and defects, etc.). This information is fed into a self consistent simulator, which solves the drift diffusion equation coupled with the two dimensional Poisson's equation to take full account of short channel effects. Simulated GFET characteristics were benchmarked against experimental data from our fabricated devices. Our simulations show that scalability is supposed to bring to RF performance an improvement that is, however, highly limited by instability. Despite the possibility of a lower performance, a careful choice of the bias point can avoid instability. Nevertheless, maximum oscillation frequencies are still achievable in the THz region for channel lengths of a few hundreds of nanometers.
description: 29 pages, 7 figures, 1 table, Supplementary Information (10 pages) Funded by: 1 Micronova Nanofabrication Centre 2 European Union's Horizon 2020 (696656) 3 MINECO (TEC2013-42622-R, TEC2015-67462-C2-1-R, TEC2016-80839-P, MINECO/FEDER, FJCI-2014-19643) 4 MECD (CAS16/00043) 5 Generalitat de Catalunya (2014 SGR 384)
High-quality two-nucleon potentials up to fifth order of the chiral expansion
Creators: name: Entem, D. R.
name: Machleidt, R.
name: Nosyk, Y.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We present NN potentials through five orders of chiral effective field theory ranging from leading order (LO) to next-to-next-to-next-to-next-to-leading order (N4LO). The construction may be perceived as consistent in the sense that the same power counting scheme as well as the same cutoff procedures are applied in all orders. Moreover, the long-range parts of these potentials are fixed by the very accurate pi-N LECs as determined in the Roy-Steiner equations analysis by Hoferichter, Ruiz de Elvira and coworkers. In fact, the uncertainties of these LECs are so small that a variation within the errors leads to effects that are essentially negligible, reducing the error budget of predictions considerably. The NN potentials are fit to the world NN data below pion-production threshold of the year of 2016. The potential of the highest order (N4LO) reproduces the world NN data with the outstanding chi^2/datum of 1.15, which is the highest precision ever accomplished for any chiral NN potential to date. The NN potentials presented may serve as a solid basis for systematic ab initio calculations of nuclear structure and reactions that allow for a comprehensive error analysis. In particular, the consistent order by order development of the potentials will make possible a reliable determination of the truncation error at each order. Our family of potentials is non-local and, generally, of soft character. This feature is reflected in the fact that the predictions for the triton binding energy (from two-body forces only) converges to about 8.1 MeV at the highest orders. This leaves room for three-nucleon-force contributions of moderate size.
description: 24 pages, 3 figures. Section about three-nucleon forces expanded. Section about uncertainty quantifications added
Dynamics of Economic Integration in Asia Pacific: from Multilateralism to Regionalism to Bilateralism
Creators: name: Mangla, Sanjay Kumar
Publisher: name: Research Administration Division
Year: 2022
Subjects: Economic integration
Free Trade Agreements (FTAs)
Regional Trade Agreements (RTAs)
Asia Pacific region (APAC)
Export volume

description: Thammasat Review, 25, 2, 64-129
Integrated waveguides and deterministically positioned nitrogen vacancy centers in diamond created by femtosecond laser writing
Creators: name: Hadden, J. P.
name: Bharadwaj, V.
name: Sotillo, B.
name: Rampini, S.
name: Osellame, R.
name: Witmer, J.
name: Jayakumar, H.
name: Fernandez, T. T.
name: Chiappini, A.
name: Armellini, C.
name: Ferrari, M.
name: Ramponi, R.
name: Barclay, P. E.
name: Eaton, S. M.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Diamond's nitrogen vacancy (NV) center is an optically active defect with long spin coherence times, showing great potential for both efficient nanoscale magnetometry and quantum information processing schemes. Recently, both the formation of buried 3D optical waveguides and high quality single NVs in diamond were demonstrated using the versatile femtosecond laser-writing technique. However, until now, combining these technologies has been an outstanding challenge. In this work, we fabricate laser written photonic waveguides in quantum grade diamond which are aligned to within micron resolution to single laser-written NVs, enabling an integrated platform providing deterministically positioned waveguide-coupled NVs. This fabrication technology opens the way towards on-chip optical routing of single photons between NVs and optically integrated spin-based sensing.