cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Training variational quantum circuits with CoVaR: covariance root finding with classical shadows
Creators: name: Boyd, Gregory
name: Koczor, Bálint
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Exploiting near-term quantum computers and achieving practical value is a considerable and exciting challenge. Most prominent candidates as variational algorithms typically aim to find the ground state of a Hamiltonian by minimising a single classical (energy) surface which is sampled from by a quantum computer. Here we introduce a method we call CoVaR, an alternative means to exploit the power of variational circuits: We find eigenstates by finding joint roots of a polynomially growing number of properties of the quantum state as covariance functions between the Hamiltonian and an operator pool of our choice. The most remarkable feature of our CoVaR approach is that it allows us to fully exploit the extremely powerful classical shadow techniques, i.e., we simultaneously estimate a very large number $>10^4-10^7$ of covariances. We randomly select covariances and estimate analytical derivatives at each iteration applying a stochastic Levenberg-Marquardt step via a large but tractable linear system of equations that we solve with a classical computer. We prove that the cost in quantum resources per iteration is comparable to a standard gradient estimation, however, we observe in numerical simulations a very significant improvement by many orders of magnitude in convergence speed. CoVaR is directly analogous to stochastic gradient-based optimisations of paramount importance to classical machine learning while we also offload significant but tractable work onto the classical processor.
description: 25 pages, 15 figures
Approximately Sampling Elements with Fixed Rank in Graded Posets
Creators: name: Bhakta, Prateek
name: Cousins, Ben
name: Fahrbach, Matthew
name: Randall, Dana
Publisher: name: arXiv
Year: 2016
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: Combinatorics (math.CO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: Graded posets frequently arise throughout combinatorics, where it is natural to try to count the number of elements of a fixed rank. These counting problems are often $\#\textbf{P}$-complete, so we consider approximation algorithms for counting and uniform sampling. We show that for certain classes of posets, biased Markov chains that walk along edges of their Hasse diagrams allow us to approximately generate samples with any fixed rank in expected polynomial time. Our arguments do not rely on the typical proofs of log-concavity, which are used to construct a stationary distribution with a specific mode in order to give a lower bound on the probability of outputting an element of the desired rank. Instead, we infer this directly from bounds on the mixing time of the chains through a method we call $\textit{balanced bias}$. A noteworthy application of our method is sampling restricted classes of integer partitions of $n$. We give the first provably efficient Markov chain algorithm to uniformly sample integer partitions of $n$ from general restricted classes. Several observations allow us to improve the efficiency of this chain to require $O(n^{1/2}\log(n))$ space, and for unrestricted integer partitions, expected $O(n^{9/4})$ time. Related applications include sampling permutations with a fixed number of inversions and lozenge tilings on the triangular lattice with a fixed average height.
description: 23 pages, 12 figures
Level sets of the lapse function in static GR
Creators: name: Cederbaum, Carla
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present a novel physical interpretation of the level sets of the (canonical) lapse function in static isolated general relativistic space-times. Our interpretation uses a notion of 'constrained test particles'. It leads to a definition of gravitational force on test particles and to a previously unknown uniqueness result for the lapse function. In Section 5, we discuss 'photon spheres' in static isolated relativistic space-times and relate them to the level sets of the lapse function.
description: updated to published version. in D. Puetzfeld et al. (eds.), Equations of Motion in Relativistic Gravity, Fundamental Theories of Physics 179, Springer, 2015
title: Das Kastellbad von Jagsthausen - ein Beispiel für die archäologische Denkmalpflege in den 90er Jahren
Creators: name: Thiel, Andreas
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 25, Nr. 4 (1996), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Nearly Tight Bounds for Sandpile Transience on the Grid
Creators: name: Durfee, David
name: Fahrbach, Matthew
name: Gao, Yu
name: Xiao, Tao
Publisher: name: arXiv
Year: 2017
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Computer and information sciences

description: We use techniques from the theory of electrical networks to give nearly tight bounds for the transience class of the Abelian sandpile model on the two-dimensional grid up to polylogarithmic factors. The Abelian sandpile model is a discrete process on graphs that is intimately related to the phenomenon of self-organized criticality. In this process, vertices receive grains of sand, and once the number of grains exceeds their degree, they topple by sending grains to their neighbors. The transience class of a model is the maximum number of grains that can be added to the system before it necessarily reaches its steady-state behavior or, equivalently, a recurrent state. Through a more refined and global analysis of electrical potentials and random walks, we give an $O(n^4\log^4{n})$ upper bound and an $Ω(n^4)$ lower bound for the transience class of the $n \times n$ grid. Our methods naturally extend to $n^d$-sized $d$-dimensional grids to give $O(n^{3d - 2}\log^{d+2}{n})$ upper bounds and $Ω(n^{3d -2})$ lower bounds.
description: 36 pages, 4 figures
title: Personalia
Creators: name: Redaktion, Die
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 25, Nr. 4 (1996), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
title: Inhalt
Creators: name: Redaktion, Die
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 26, Nr. 1 (1997), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
A short proof of the multidimensional Szemerédi theorem in the primes
Creators: name: Fox, Jacob
name: Zhao, Yufei
Publisher: name: arXiv
Year: 2013
Subjects: subject: Number Theory (math.NT)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: Tao conjectured that every dense subset of $\mathcal{P}^d$, the $d$-tuples of primes, contains constellations of any given shape. This was very recently proved by Cook, Magyar, and Titichetrakun and independently by Tao and Ziegler. Here we give a simple proof using the Green-Tao theorem on linear equations in primes and the Furstenberg-Katznelson multidimensional Szemerédi theorem.
description: 5 pages
Analyzing Boltzmann Samplers for Bose-Einstein Condensates with Dirichlet Generating Functions
Creators: name: Bernstein, Megan
name: Fahrbach, Matthew
name: Randall, Dana
Publisher: name: arXiv
Year: 2017
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: Combinatorics (math.CO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: Boltzmann sampling is commonly used to uniformly sample objects of a particular size from large combinatorial sets. For this technique to be effective, one needs to prove that (1) the sampling procedure is efficient and (2) objects of the desired size are generated with sufficiently high probability. We use this approach to give a provably efficient sampling algorithm for a class of weighted integer partitions related to Bose-Einstein condensation from statistical physics. Our sampling algorithm is a probabilistic interpretation of the ordinary generating function for these objects, derived from the symbolic method of analytic combinatorics. Using the Khintchine-Meinardus probabilistic method to bound the rejection rate of our Boltzmann sampler through singularity analysis of Dirichlet generating functions, we offer an alternative approach to analyze Boltzmann samplers for objects with multiplicative structure.
description: 20 pages, 1 figure
title: Dokumentation und Restaurierung der mittelalterlichen Glasfenster aus St. Dionys in Esslingen
Creators: name: Berkenkopf, Peter
name: Wölbert, Otto
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 26, Nr. 1 (1997), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Enhancing CTR Prediction with Context-Aware Feature Representation Learning
Creators: name: Wang, Fangye
name: Wang, Yingxu
name: Li, Dongsheng
name: Gu, Hansu
name: Lu, Tun
name: Zhang, Peng
name: Gu, Ning
Publisher: name: arXiv
Year: 2022
Subjects: subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: CTR prediction has been widely used in the real world. Many methods model feature interaction to improve their performance. However, most methods only learn a fixed representation for each feature without considering the varying importance of each feature under different contexts, resulting in inferior performance. Recently, several methods tried to learn vector-level weights for feature representations to address the fixed representation issue. However, they only produce linear transformations to refine the fixed feature representations, which are still not flexible enough to capture the varying importance of each feature under different contexts. In this paper, we propose a novel module named Feature Refinement Network (FRNet), which learns context-aware feature representations at bit-level for each feature in different contexts. FRNet consists of two key components: 1) Information Extraction Unit (IEU), which captures contextual information and cross-feature relationships to guide context-aware feature refinement; and 2) Complementary Selection Gate (CSGate), which adaptively integrates the original and complementary feature representations learned in IEU with bit-level weights. Notably, FRNet is orthogonal to existing CTR methods and thus can be applied in many existing methods to boost their performance. Comprehensive experiments are conducted to verify the effectiveness, efficiency, and compatibility of FRNet.
description: SIGIR 2022
Critiquing eco/ego/sustainable tourism: Broadening horizons
Creators: name: Wheeller, Brian
Publisher: name: Cardiff Metropolitan University
Year: 2022
Subjects: Impacts of tourism

description: In the early 1990's, I argued that the real issues, those at the crux of tourism impact problems, were not being addressed - pertinent questions ignored amidst the blossoming euphoria of green rhetoric. A process emerged in tourism development whereby ego-enhancing, politically correct sound bites drowned out the voice of reason, namely common sense. Wonderfully self-satisfying, this proved a smug and timely convenience as politicians, planners, 'travellers' and increasingly (even) many tourism academics appeared to see problems without answers as an anathema. There must either be 'answers' irrespective of their practical effectiveness or a process be enthusiastically embraced whereby difficult questions are eliminated, or dismissed to the realms of the nihilistic fringe. Enter eco/ego/sustainable tourism. Scoring heavily on both counts, dovetailing nicely into the milieu of deceit while simultaneously reinforcing the required veneer of respectable positivism, it enabled the mundane, but crucial (and I argue intractable) questions to be systematically and deliberately sidestepped. Fifteen years on, little has changed. The futility of sustainable tourism is around us for all to see - should we choose, or care, to look. But, even now, we cannot face up to seeing it for what it is. Or, actually, what it isn't. The canard continues. Focussing on eco/ego/sustainable tourism, the thesis presents selected published works reflecting the nexus of my thinking on - and contribution to - the body of learning. It is a subjective, emotive perspective, with the emphasis on 'the personal'. And the eclectic. Concomitantly, the author advocates the use of 'visual' imagery, much in evidence in the publications, to fire imagination. The works seek to illustrate the manner in which empirical observation, experience and theory are all interwoven. Consequently, it is not just a matter of content, but of process: the means of illuminating and conveying ideas, and of teaching, are also explored. The essence of the argument presented in the thesis is that the void, the chasm between theory and practice, between what (perhaps) 'should be' and what actually 'is', cannot be bridged. The sheer number of tourists travelling, the absolute volume involved, combined with widespread corruption and the increasing adoption (universally?) of a 'what's in it for me, now' mentality, together negate any 'sustainable' efforts of redemption. My cynical views of eco/ego/sustainable tourism have not mellowed over the years. On the contrary, they have hardened as, alarmed, I have become increasingly pessimistic in (the dismal) light of the burgeoning optimism of others as to the potential, always potential, of sustainability. Dream on. The counter plea here, then - in ever more stringent tones - is that of the necessity to contextualise eco/ego/sustainable tourism within reality - to exit fantasy land. I, too, can dream, can't I?
title: Editorial
Creators: name: Fingerlin, Gerhard
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 26, Nr. 2 (1997), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Disorder-Driven Spin-Reorientation in Multiferroic $h-YMn_{1-x}Fe_xO_3$
Creators: name: Namdeo, Sonu
name: Rao, S. S. S.
name: Kaushik, S. D.
name: Siruguri, V.
name: Awasthi, A. M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Magnetic structure evolution of multiferroic hexagonal $YMn_{1-x}Fe_{x}O_{3}$ (${x} = 0, 0.05,$ and $0.1$) has been studied by carrying out detailed temperature-dependent neutron diffraction at zero- and 5T-fields. Thermodynamic data confirm antiferromagnetic ordering at $T_{N}$ in all the compositions. Our sub-$T_{N}$ neutron diffraction results assign the magnetic structure of pure $YMnO_3$ to $Γ_{1}$ irreducible representation. Over the perturbative-doping range, the magnetic configuration changes via $Γ_{1}+Γ_{2}$ for $YMn_{0.95}Fe_{0.05}O_{3}$ on to $Γ_{2}$ for $YMn_{0.9}Fe_{0.1}O_{3}$, as the maiden compositional analogue of spin-reorientation; its occurrence in temperature-domain already reported for several manganites. Moreover, while the large thermal isostructural changes observed above ${T}_{N}$ are subdued in the ordered state, small alterations by the applied 5T-field are relatively uniform across, confirming strong magneto-elastic nature of the system. Decrease of the ordered magnetic moment ($μ_{ord}$) and planar magnetic frustration noted with Fe-doping is enhanced by the applied field, apparently through canting.
description: 19 pages, 1 table, 9 figures, 32 (numbered) references (groups)
title: Mitteilung
Creators: name: Redaktion, Die
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 26, Nr. 2 (1997), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
title: Ausstellungen ; Abbildungsnachweis
Creators: name: Redaktion, Die
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 26, Nr. 2 (1997), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Robust sensitive dependence of geometric Gibbs states for analytic families of quadratic maps
Creators: name: Coronel, Daniel
name: Rivera-Letelier, Juan
Publisher: name: arXiv
Year: 2017
Subjects: subject: Dynamical Systems (math.DS)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 37D3, 537E0, 537F44

description: For quadratic-like maps, we show a phenomenon of sensitive dependence of geometric Gibbs states: There are analytic families of quadratic-like maps for which an arbitrarily small perturbation of the parameter can have a definite effect on the low-temperature geometric Gibbs states. Furthermore, this phenomenon is robust: There is an open set of analytic 2-parameter families of quadratic-like maps that exhibit sensitive dependence of geometric Gibbs states. We introduce a geometric version of the Peierls condition for contour models ensuring that the low-temperature geometric Gibbs states are concentrated near the critical orbit.
description: The title changed. A discussion about the topology and combinatorics of the maps was added before the Main Theorem
Grassmannian BGG Complexes and Hodge numbers of irregular varieties
Creators: name: González-Alonso, Víctor
Publisher: name: arXiv
Year: 2013
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 32J27 (primary), 58A14, 14C30 (secondary)

description: In this paper we investigate the exactness of the Grassmannian BGG complexes introduced in a previous work (arXiv:1211.2486), and obtain some inequalities between some Hodge numbers of some irregular varieties. In particular, we obtain sharp lower bounds for the Hodge numbers of smooth subvarieties of Abelian varieties, as well as some improvements of results of Lazarsfeld and Popa and Lombardi concerning threefolds and fourfolds.
description: 15 pages. Minor changes and improved exposition, thanks to comments of the referee. Accepted for publication in the Bulletin of the LMS
title: Veröffentlichungen des Landesdenkmalamtes Baden-Württemberg
Creators: name: Redaktion, Die
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 26, Nr. 2 (1997), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Higgs quartic coupling and neutrino sector evolution in 2UED models
Creators: name: Abdalgabar, Ammar
name: Cornell, Alan S.
name: Deandrea, Aldo
name: Tarhini, Ahmad
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Two compact universal extra dimensional models are an interesting class of models for different theoretical and phenomenological issues, such as the justification of having three standard model fermion families, suppression of proton decay rate, dark matter parity from relics of the 6-dimensional Lorentz symmetry, origin of masses and mixings in the standard model. However, these theories are merely effective ones, with typically a reduced range of validity in their energy scale. We explore two limiting cases of the three standard model generations all propagating in the bulk or all localised to a brane, from the point of view of renormalisation group equation evolutions for the Higgs sector and for the neutrino sector of these models. The recent experimental results of the Higgs boson from the LHC allow, in some scenarios, stronger constraints on the cut-off scale to be placed, from the requirement of the stability of the Higgs potential.
description: 9 pages, 6 figures, accepted for publication in European Physical Journal C. arXiv admin note: text overlap with arXiv:1306.4852
Self-propulsion of chemically-active droplets
Creators: name: Michelin, Sebastien
Publisher: name: arXiv
Year: 2022
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Microscopic active droplets are able to swim autonomously in viscous flows: this puzzling feature stems from solute exchanges with the surrounding fluid via surface reactions or their spontaneous solubilisation, and the interfacial flows resulting from these solutes' gradients. Contrary to asymmetric active colloids, these isotropic droplets swim spontaneously by exploiting the nonlinear coupling of solute transport with self-generated Marangoni flows, which is also responsible for secondary transitions to more complex individual and collective dynamics. Thanks to their simple design and their sensitivity to physico-chemical signals, they are fascinating physicists, chemists, biologists and fluid dynamicists alike to analyse viscous self-propulsion and collective dynamics in active matter systems, to develop synthetic cellular models or to perform targeted biomedical or engineering applications. I review here the most recent and significant developments of this rapidly-growing field, focusing on the mathematical and physical modelling of these intringuing droplets, together with its experimental design and characterisation.
description: 26 pages, 8 figures, to appear in Annual Review of Fluid Mechanics
Music Source Separation with Generative Flow
Creators: name: Zhu, Ge
name: Darefsky, Jordan
name: Jiang, Fei
name: Selitskiy, Anton
name: Duan, Zhiyao
Publisher: name: arXiv
Year: 2022
Subjects: subject: Audio and Speech Processing (eess.AS)
subject: Sound (cs.SD)
subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Fully-supervised models for source separation are trained on parallel mixture-source data and are currently state-of-the-art. However, such parallel data is often difficult to obtain, and it is cumbersome to adapt trained models to mixtures with new sources. Source-only supervised models, in contrast, only require individual source data for training. In this paper, we first leverage flow-based generators to train individual music source priors and then use these models, along with likelihood-based objectives, to separate music mixtures. We show that in singing voice separation and music separation tasks, our proposed method is competitive with a fully-supervised approach. We also demonstrate that we can flexibly add new types of sources, whereas fully-supervised approaches would require retraining of the entire model.
description: Accepted by Signal Processing Letters
Silent voices of tourism: a narrative exploration of cervical spinal cord injury and leisure travel
Creators: name: Luther, Angela
Publisher: name: Cardiff Metropolitan University
Year: 2022
Subjects: Tourism not elsewhere classified

description: Utilising an inter-disciplinary approach, this qualitative inquiry seeks to create a space for an absent group and experience by addressing severe physical disability, social exclusion and leisure travel. Drawing on a blended methodology - critical discourse analysis, feminist standpoint and narrative inquiry - it explores, via in-depth interviews, discussions and non-participant observation, the lived experiences of twelve individuals with cervical spinal cord injury (C-SCI) in the USA in relation to travel constraints and what impact (non)participation might have on their overall well-being, quality of life and social inclusion. The challenges of working with such medically and socially-vulnerable research participants are detailed together with those of the study's inclusive and reflexive research approach and presentation, in narrative form, of their unheard stories. Using an approach involving social constructionism and a largely social model of disability, the individual, social and societal analysis of the data illustrates increased levels of obstacles for those who are ventilator-dependent, those who acquired the condition around birth or as young children, and for females in general. Details of the plethora of complex, inter-related environmental, intrinsic and interactive barriers and constraints to participation reveal that most are connected to, or are exacerbated by, socio-political practices and structures. The most significant and long-term psychosocial benefits of leisure travel are associated with those with the highest level of CSCI, chiefly with the desire, post-holiday, to abandon daily pleas for assisted suicide and to begin to live life again, often within mainstream society. Furthermore, the analysis reveals the power of the dominant medical discourse of disability on the participants' largely negative self-concept, knowledge and non-actions in relation to leisure travel. A number of potential practical solutions are suggested. Key policy-driven solutions centre on the provision of a brief, one-off, local holiday towards the end of hospital rehabilitation - to provide a goal and the practical skills necessary for reintegration - as well as on the availability, during hospital rehabilitation, of a different or alternative narrative resource of disability and travel.
title: Rede zur Eröffnung des Tages des offenen Denkmals 1998
Creators: name: Döring, Walter
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 27, Nr. 4 (1998), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
title: 27. Jahrgang 1998 - Register
Creators: name: Redaktion, Die
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 27, Nr. 4 (1998), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Logarithmic Morphological Neural Nets robust to lighting variations
Creators: name: Noyel, Guillaume
name: Barbier--Renard, Emile
name: Jourlin, Michel
name: Fournel, Thierry
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Numerical Analysis (math.NA)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Morphological neural networks allow to learn the weights of a structuring function knowing the desired output image. However, those networks are not intrinsically robust to lighting variations in images with an optical cause, such as a change of light intensity. In this paper, we introduce a morphological neural network which possesses such a robustness to lighting variations. It is based on the recent framework of Logarithmic Mathematical Morphology (LMM), i.e. Mathematical Morphology defined with the Logarithmic Image Processing (LIP) model. This model has a LIP additive law which simulates in images a variation of the light intensity. We especially learn the structuring function of a LMM operator robust to those variations, namely : the map of LIP-additive Asplund distances. Results in images show that our neural network verifies the required property.
On mini-superspace limit of boundary three-point function in Liouville field theory
Creators: name: Apresyan, Elena
name: Sarkissian, Gor
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study mini-superspace semiclassical limit of the boundary three-point function in the Liouville field theory. We compute also matrix elements for the Morse potential quantum mechanics. An exact agreement between the former and the latter is found. We show that both of them are given by the generalized hypergeometric functions.
description: 18 pages
Diffusion on networked systems is a question of time or structure
Creators: name: Delvenne, Jean-Charles
name: Lambiotte, Renaud
name: Rocha, Luis E. C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Probability (math.PR)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Network science investigates the architecture of complex systems to understand their functional and dynamical properties. Structural patterns such as communities shape diffusive processes on networks. However, these results hold under the strong assumption that networks are static entities where temporal aspects can be neglected. Here we propose a generalised formalism for linear dynamics on complex networks, able to incorporate statistical properties of the timings at which events occur. We show that the diffusion dynamics is affected by the network community structure and by the temporal properties of waiting times between events. We identify the main mechanism --- network structure, burstiness or fat-tails of waiting times --- determining the relaxation times of stochastic processes on temporal networks, in the absence of temporal-structure correlations. We identify situations when fine-scale structure can be discarded from the description of the dynamics or, conversely, when a fully detailed model is required due to temporal heterogeneities.
description: Fundamental revision from v1
First Light And Reionisation Epoch Simulations (FLARES) V: The redshift frontier
Creators: name: Wilkins, Stephen M.
name: Vijayan, Aswin P.
name: Lovell, Christopher C.
name: Roper, William J.
name: Irodotou, Dimitrios
name: Caruana, Joseph
name: Seeyave, Louise T. C.
name: Kuusisto, Jussi K.
name: Thomas, Peter A.
name: Parris, Shedeur A. K.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The James Webb Space Telescope (JWST) is set to transform many areas of astronomy, one of the most exciting is the expansion of the redshift frontier to $z>10$. In its first year alone JWST should discover hundreds of galaxies, dwarfing the handful currently known. To prepare for these powerful observational constraints, we use the First Light And Reionisation Epoch (FLARES) simulations to predict the physical and observational properties of the $z>10$ population of galaxies accessible to JWST. This is the first time such predictions have been made using a hydrodynamical model validated at low redshift. Our predictions at $z=10$ are broadly in agreement with current observational constraints on the far-UV luminosity function and UV continuum slope $β$, though the observational uncertainties are large. We note tension with recent constraints $z\sim 13$ from Harikane et al. 2022 - compared to these constraints, FLARES predicts objects with the same space density should have an order of magnitude lower luminosity, though this is mitigated slightly if dust attenuation is negligible in these systems. Our predictions suggest that in JWST's first cycle alone, around $600$ galaxies should be identified at $z>10$, with the first small samples available at $z>13$.
description: Submitted to MNRAS 20/04/2022
A study of the association between undergraduates' resilience and their coping
Creators: name: Bruneau, Benjamin M. S.
Publisher: name: Cardiff Metropolitan University
Year: 2022
Subjects: Educational psychology

description: Existing research indicates that resilience is related to a person's ability to cope with stress. However, there is no empirical evidence to support the existence of such a relationship for undergraduates. The current research examined this association by administering a detailed questionnaire to students at two similar universities at four points during their first fourteen months of university and interviewing a sub-sample at the end of that period. Five hundred and seventy eight undergraduates participated in the study. The results showed that, across the measure period, undergraduates experienced stressors that were predominantly due to daily annoyances and the difficulties of choosing among equally important alternatives in the university environment. They used a mixture of problem-focused coping strategies and self-regulated coping behaviours, but they constantly avoided all emotion-focused coping strategies, except the one of turning to religion for solutions to their problems. There was no association between their coping efforts and their psychological well-being, and between their resilience and their success in courses at the first attempt. First-time achievers, however, sought more information, advice and material assistance from others in order to cope with their stressors. It was concluded that undergraduates repeatedly experience stress due to annoyances and conflicts, that they cope with stress avoiding most emotion-focused coping strategies, signifying that they feel their stressors are amenable to change, that their psychological well-being is not related to how they cope with university stressors, and that their self-esteem and optimism are not related to their coping. However, their lower perceived control is associated with their seeking of advice and support from others, a coping strategy that is consequently associated with their success in courses at the first attempt. Such information will allow universities to be more proactive in the provision of appropriate support information given to the undergraduate.
title: Ausstellungen ; Abbildungsnachweis
Creators: name: Redaktion, Die
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 28, Nr. 4 (1999), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
The topology of nilpotent representations in reductive groups and their maximal compact subgroups
Creators: name: Bergeron, Maxime
Publisher: name: arXiv
Year: 2013
Subjects: subject: Group Theory (math.GR)
subject: Algebraic Geometry (math.AG)
subject: Algebraic Topology (math.AT)
subject: Geometric Topology (math.GT)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 55P10, 20G05, 20G20 (Primary), 14P25, 14L24 (Secondary)

description: Let G be a complex reductive linear algebraic group and let K be a maximal compact subgroup of G. Given a nilpotent group Γgenerated by r elements, we consider the representation spaces Hom(Γ,G) and Hom(Γ,K) with the natural topology induced from an embedding into G^r and K^r respectively. The goal of this paper is to prove that there is a strong deformation retraction of Hom(Γ,G) onto Hom(Γ,K). We also obtain a strong deformation retraction of the geometric invariant theory quotient Hom(Γ,G)//G onto Hom(Γ,K)/K.
description: 25 pages, minor changes, accepted for publication in Geometry and Topology
title: Grußwort
Creators: name: Izsak, Klemens
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 29, Nr. 4 (2000), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Rigidity transitions in zero-temperature polygons
Creators: name: Gandikota, M. C.
name: Parker, Amanda
name: Schwarz, J. M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We study geometrical clues of a rigidity transition due to the emergence of a system-spanning state of self stress in under-constrained systems of individual polygons and spring networks constructed from such polygons. When a polygon with harmonic bond edges and an area spring constraint is subject to an expansive strain, we observe that convexity of the polygon is a necessary condition for such a self stress. We prove that the cyclic configuration of the polygon is a sufficient condition for the self stress. This correspondence of geometry and rigidity is akin to the straightening of a one dimensional chain of springs to rigidify it. We predict the onset of the rigidity transition using a purely geometrical method. We also estimate the transition strain for a given initial configuration by approximating irregular polygons as regular polygons. These findings help determine the rigidity of an area-preserving polygon just by looking at it. Since two-dimensional spring networks can be considered as a network of polygons, we look for similar geometric features in under-constrained spring networks under isotropic expansive strain. In particular, we observe that all polygons attain convexity at the rigidity transition such that the fraction of convex, but not cyclic, polygons predicts the onset of the rigidity transition. Interestingly, acyclic polygons in the network correlate with larger tensions, thus, forming effective force chains.
description: 12 pages, 10 figures
Ability of black soldier fly larvae to bioaccumulate tocopherols from different substrates and measurement of larval tocopherol bioavailability in vitro
Creators: name: Morand-Laffargue, L.
name: Vairo, D.
name: Halimi, C.
name: Chiarello, E.
name: Creton, B.
name: Sabatier, D.
name: Borel, P.
Publisher: name: Brill Online
Year: 2023
Subjects: classificationCode: 309999
subject: Other agricultural, veterinary and food sciences not elsewhere classified

description: Edible insects are an emerging approach to provide sustainable proteins in feed. Black soldier fly larvae (BSFL) can also bioaccumulate micronutrients from various substrates. The purpose of this study was to assess whether BSFL can bioaccumulate significant concentrations of bioavailable α and ɣ-tocopherol (TOC) from vitamin E (VE) rich substrates. BSFL were reared on VE rich substrates, e.g. wheat germ oil, bran, etc. α and γ-tocopherol were quantified in larvae and substrates by HPLC. VE bioaccessibility was estimated using an in vitro model of digestion. Uptake efficiency of micellarized VE by intestinal cell was estimated using Caco-2 cells. BSFL were at least as rich in α-TOC, but not ɣ-TOC, as the substrates they were reared on BSFL. VE bioaccessibility was almost always significantly lower in BSFL than in corresponding substrates. Conversely, VE uptake efficiency was either not significantly different or significantly higher in BSFLs than in substrates. Thus, VE enrichment of BSFL from VE rich substrates, in particular co-products such as brans and oil cakes, could be an innovative way to recycle VE and to provide significant amounts of sustainable VE in farm animal feed.
title: Denkmalschutzpreis 2000
Creators: name: Wörner, Hans Jakob
name: Breuer, Judith
name: Bongartz, Norbert
name: Boeyng, Ulrich
name: Gräf, Ulrich
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 30, Nr. 1 (2001), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Topological defects in the Liouville field theories with different cosmological constants
Creators: name: Apresyan, Elena
name: Sarkissian, Gor
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct topological defects in the Liouville field theory producing jump in the value of cosmological constant. We construct them using the Cardy-Lewellen equation for the two-point function with defect. We show that there are continuous and discrete families of such kind of defects. For the continuous family of defects we also find the Lagrangian description and check its agreement with the solution of the Cardy-Lewellen equation using the heavy asymptotic semiclasscial limit.
description: 15 pages
title: Mode aus Modeln. Kruseler- und andere Tonfiguren des 14. bis 16. Jahrhunderts aus dem Germanischen Nationalmuseum und anderen Sammlungen ; Abbildungsnachweis
Creators: name: Gross, Uwe
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 30, Nr. 1 (2001), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Monomial Valuations, Cusp Singularities, and Continued Fractions
Creators: name: Bruce, Juliette
name: Logue, Molly
name: Walker, Robert
Publisher: name: arXiv
Year: 2013
Subjects: subject: Algebraic Geometry (math.AG)
subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics

description: This paper explores the relationship between real valued monomial valuations on $k(x,y)$, the resolution of cusp singularities, and continued fractions. It is shown that up to equivalence there is a one to one correspondence between real valued monomial valuations on $k(x,y)$ and continued fraction expansions of real numbers between zero and one. This relationship with continued fractions is then used to provide a characterization of the valuation rings for real valued monomial valuations on $k(x,y)$. In the case when the monomial valuation is equivalent to an integral monomial valuation, we exhibit explicit generators of the valuation rings. Finally, we demonstrate that if $ν$ is a monomial valuation such that $ν(x)=a$ and $ν(y)=b$, where $a$ and $b$ are relatively prime positive integers larger than one, then $ν$ governs a resolution of the singularities of the plane curve $x^{b}=y^{a}$ in a way we make explicit. Further, we provide an exact bound on the number of blow ups needed to resolve singularities in terms of the continued fraction of $a/b$
description: 20 pages, Corrected Author Information
A tight lower bound for an online hypercube packing problem and bounds for prices of anarchy of a related game
Creators: name: Kohayakawa, Y.
name: Miyazawa, F. K.
name: Wakabayashi, Y.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: We prove a tight lower bound on the asymptotic performance ratio $ρ$ of the bounded space online $d$-hypercube bin packing problem, solving an open question raised in 2005. In the classic $d$-hypercube bin packing problem, we are given a sequence of $d$-dimensional hypercubes and we have an unlimited number of bins, each of which is a $d$-dimensional unit hypercube. The goal is to pack (orthogonally) the given hypercubes into the minimum possible number of bins, in such a way that no two hypercubes in the same bin overlap. The bounded space online $d$-hypercube bin packing problem is a variant of the $d$-hypercube bin packing problem, in which the hypercubes arrive online and each one must be packed in an open bin without the knowledge of the next hypercubes. Moreover, at each moment, only a constant number of open bins are allowed (whenever a new bin is used, it is considered open, and it remains so until it is considered closed, in which case, it is not allowed to accept new hypercubes). Epstein and van Stee [SIAM J. Comput. 35 (2005), no. 2, 431-448] showed that $ρ$ is $Ω(\log d)$ and $O(d/\log d)$, and conjectured that it is $Θ(\log d)$. We show that $ρ$ is in fact $Θ(d/\log d)$. To obtain this result, we elaborate on some ideas presented by those authors, and go one step further showing how to obtain better (offline) packings of certain special instances for which one knows how many bins any bounded space algorithm has to use. Our main contribution establishes the existence of such packings, for large enough $d$, using probabilistic arguments. Such packings also lead to lower bounds for the prices of anarchy of the selfish $d$-hypercube bin packing game. We present a lower bound of $Ω(d/\log d)$ for the pure price of anarchy of this game, and we also give a lower bound of $Ω(\log d)$ for its strong price of anarchy.
Mean field theory of failed thermalizing avalanches
Creators: name: Crowley, Philip J. D.
name: Chandran, Anushya
Publisher: name: arXiv
Year: 2022
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We show that localization in quasiperiodically modulated, two-dimensional systems is stable to the presence of a finite density of ergodic grains. This contrasts with the case of randomly modulated systems, where such grains seed thermalizing avalanches. These results are obtained within a quantitatively accurate, self-consistent entanglement mean field theory which analytically describes two level systems connected to a central ergodic grain. The theory predicts the distribution of entanglement entropies of each two level system across eigenstates, and the late time values of dynamical observables. In addition to recovering the known phenomenology of avalanches, the theory reproduces exact diagonalization data, and predicts the spatial profile of the thermalized region when the avalanche fails.
description: 13 pages, 5 figures
title: Inhalt
Creators: name: Redaktion, Die
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 30, Nr. 3 (2001), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Removable singularities of the CscK metric
Creators: name: Zeng, Yu
Publisher: name: arXiv
Year: 2013
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: In this paper, we consider a CscK metric defined away from divisor and with metric upper bound and lower bound going to zero in certain rate. And we'll prove that this "nicely" behaved metric is a smooth CscK metric across the divisor.
description: presentation improved
Circular (Yet Sound) Proofs
Creators: name: Atserias, Albert
name: Lauria, Massimo
Publisher: name: arXiv
Year: 2018
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: Proofs in propositional logic are typically presented as trees of derived formulas or, alternatively, as directed acyclic graphs of derived formulas. This distinction between tree-like vs. dag-like structure is particularly relevant when making quantitative considerations regarding, for example, proof size. Here we analyze a more general type of structural restriction for proofs in rule-based proof systems. In this definition, proofs are directed graphs of derived formulas in which cycles are allowed as long as every formula is derived at least as many times as it is required as a premise. We call such proofs "circular". We show that, for all sets of standard inference rules with single or multiple conclusions, circular proofs are sound. We start the study of the proof complexity of circular proofs at Circular Resolution, the circular version of Resolution. We immediately see that Circular Resolution is stronger than Dag-like Resolution since, as we show, the propositional encoding of the pigeonhole principle has circular Resolution proofs of polynomial size. Furthermore, for derivations of clauses from clauses, we show that Circular Resolution is, surprisingly, equivalent to Sherali-Adams, a proof system for reasoning through polynomial inequalities that has linear programming at its base. As corollaries we get: 1) polynomial-time (LP-based) algorithms that find Circular Resolution proofs of constant width, 2) examples that separate Circular from Dag-like Resolution, such as the pigeonhole principle and its variants, and 3) exponentially hard cases for Circular Resolution. Contrary to the case of Circular Resolution, for Frege we show that circular proofs can be converted into tree-like proofs with at most polynomial overhead.
description: 4 figures