cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Superconducting fluctuations and pseudogap in high-Tc cuprates
Creators: name: Rullier-Albenque, F.
name: Alloul, H.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Large pulsed magnetic fields up to 60 Tesla are used to suppress the contribution of superconducting fluctuations (SCF) to the ab-plane conductivity above Tc in a series of YBa2Cu3O(6+x). These experiments allow us to determine the field H'c(T) and the temperature T'c above which the SCFs are fully suppressed. A careful investigation near optimal doping shows that T'c is higher than the pseudogap temperature T*, which is an unambiguous evidence that the pseudogap cannot be assigned to preformed pairs. Accurate determinations of the SCF contribution to the conductivity versus temperature and magnetic field have been achieved. They can be accounted for by thermal fluctuations following the Ginzburg-Landau scheme for nearly optimally doped samples. A phase fluctuation contribution might be invoked for the most underdoped samples in a T range which increases when controlled disorder is introduced by electron irradiation. Quantitative analysis of the fluctuating magnetoconductance allows us to determine the critical field Hc2(0) which is found to be be quite similar to H'c(0) and to increase with hole doping. Studies of the incidence of disorder on both T'c and T* allow us to propose a three dimensional phase diagram including a disorder axis, which allows to explain most observations done in other cuprate families.
description: Paper presented at the "Eurasia-Pacific Summer School & Conference on Correlated Electrons", Turunc-Marmaris, Turkey, July 4-14, 2011
Chronica (Fragmente)
Creators: name: Fredegarius
Publisher: name: [s.n.]
Year: 2025

description: Fredegar
description: Öffentliche Bibliothek der Universität Basel
description: Lateinisch
description: Die drei Stücke wurden als Teil eines Einbands überliefert; der Trägerband ist nicht bekannt. Die Fragmente 1 und 2 gehörten ursprünglich zur gleichen Handschrift, das Fragment 3 lässt sich nicht klar zuordnen: Das Pergament scheint ähnlich, die Schrift ist wahrscheinlich später.
description: Verzeichnung=Description=Inventaire Mai 2017 HAN-Katalogisierungsregeln Minimalaufnahme nach: Bischoff, 1998
description: Verzeichnung=Description=Inventaire Mai 2020 HAN-Katalogisierungsregeln Normalaufnahme nach: Bischoff, 1998, und Autopsie
description: Erschliessungsniveau Normalniveau
Inhalt
Creators: name: Redaktion, Die
Publisher: name: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
Year: 2020

description: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege, Bd. 27 Nr. 6 (1974): Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
Identifying a new intermediate-polar using XMM-Newton and INTEGRAL
Creators: name: Middleton, Matthew J.
name: Cackett, Edward M.
name: Shaw, Craig
name: Ramsay, Gavin
name: Roberts, Timothy P.
name: Wheatley, Peter J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The bright X-ray source, 2XMMi J180438.7-145647 is fortunate to have long baseline observations in INTEGRAL that compliment observations taken by other missions. Optical spectroscopy of this object has suggested a distance of ~7 kpc and an identification with a low mass X-ray binary. We instead use the X-ray data from 0.3-40 keV to identify the source as a bright intermediate polar (IP) with an estimate for the white dwarf mass of~0.60 M_solar. This identification is supported by the presence of an iron triplet, the component lines of which are some of the strongest seen in IPs; and the signature of the spin period of the white dwarf at ~24 mins. We note that the lack of broad-band variability may suggest that this object is a stream-fed IP, similar in many respects to the well studied IP, V2400 Oph. Phase-binning has allowed us to create spectra corresponding to the peaks and troughs of the lightcurve from which we determine that the spectra appear harder in the troughs, consistent with the behaviour of other IPs binned on their spin periods. This work strongly suggests a mis-identification in the optical due to the presence of large columns of enshrouding material. We instead propose a distance to the source of <2.5 kpc to be consistent with the luminosities of other IPs in the dim, hard state. The relatively high flux of the source together with the strength of the iron lines may, in future, allow the source to be used to diagnose the properties of the shock heated plasma and the reflected component of the emission.
description: 7 pages, 3 figures, submitted to MNRAS, lead author affiliated with the University of Durham
Einnahmenbuch
Creators: name: Hotel Jura Basel
Publisher: name: [s.n.]
Year: 1904

description: Deutsch
description: Verzeichnung=Description=Inventaire 08.01.2025 Automatisierter Import Archivbestand
description: Verzeichnung=Description=Inventaire ISAD(G) / HAN Katalogisierungsregeln für Archivbestände Detailliert
Electroweak results at LHCb
Creators: name: Amhis, Yasmine
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: $W$ and $Z$ production cross-sections have been measured in proton-proton collisions at a center-of-mass energy of 7 TeV using the decays $W\rightarrow μν$, $Z\rightarrow μμ$ and $Z\rightarrow ττ$ collected by the LHCb detector. For all the measurements at least one of the reconstructed muons has a transverse momentum, $p_T$, above 20 GeV/$c$ and a pseudorapidity, $η$, between 2 and 4.5. In the case of the $Z$, a di-muon invariant mass between 60 GeV$/c^2$ and 120 GeV$/c^2$ is required. Theoretical predictions, calculated at next-to-next-to-leading order in QCD using recent parton distribution functions (PDFs), are found to be in agreement with the measurements.
description: Presented at the 2011 Hadron Collider Physics symposium (HCP-2011), Paris, France, November 14-18 2011, 4 pages, 8 figures
Fracture experiments of single grain boundaries in ductile metals
Creators: name: Kupka, Daniel
Publisher: name: TUHH Universitätsbibliothek
Year: 2013
Subjects: subject: Mikro-Bruchversuche
subject: intergranularer Bruch
subject: Mikro-Druckversuche
subject: Kristallplastizität
subject: micro-fracture
subject: intergranular fracture
subject: micro-compression
subject: crystal plasticity
classificationCode: 620
subject: Ingenieurwissenschaften
classificationCode: 620
subject: Engineering and allied operations

description: Eine Methode, zur Untersuchung des Bruches einzelner Korngrenzen in duktilen Metallen, wurde auf Basis von Biegeversuchen an Mikro-Balken entwickelt. Die plastische Deformation der Biegebalken wurde mittels eines Finite Elemente Kristallplastizitätsmodells vorhergesagt, welches mit Hilfe von Druckversuchen an einkristallinen Mikrosäulen kalibriert wurde. Die Bruchparameter der Korngrenzen wurden dann im Rahmen eines Kohäsivzonenmodells bestimmt.
description: A method to investigate the fracture of a single grain boundary in ductile metals is developed based on micro-cantilever bending experiments. The plastic deformation of the cantilevers is predicted by a finite element crystal plasticity model which is calibrated making use of micro-compression experiments on single crystalline micro columns. The fracture parameters of a grain boundary are then determined in terms of a cohesive zone model.
Brief an [Heinrich] Giselinus
Creators: name: Zwinger, Jakob
Publisher: name: [s.n.]
Year: 1606

description: von Jacobus Zwingerus
description: Öffentliche Bibliothek der Universität Basel
description: Lateinisch
description: Verzeichnung=Description=Inventaire März 2023 HAN-Katalogisierungsregeln Vollständige Rekatalogisierung nach Original und Briefkatalog tri
description: Digitalisierung=Digitization=Numérisation November 2024 TIFF
StaNdaRT: A repository of standardized test models and outputs for supernova radiative transfer
Creators: name: Blondin, Stéphane
name: Blinnikov, Sergei
name: Callan, Fionntan P.
name: Collins, Christine E.
name: Dessart, Luc
name: Even, Wesley
name: Flörs, Andreas
name: Fullard, Andrew G.
name: Hillier, D. John
name: Jerkstrand, Anders
name: Kasen, Daniel
name: Katz, Boaz
name: Kerzendorf, Wolfgang
name: Kozyreva, Alexandra
name: O'Brien, Jack
name: Pássaro, Ezequiel A.
name: Roth, Nathaniel
name: Shen, Ken J.
name: Shingles, Luke
name: Sim, Stuart A.
name: Singhal, Jaladh
name: Smith, Isaac G.
name: Sorokina, Elena
name: Utrobin, Victor P.
name: Vogl, Christian
name: Williamson, Marc
name: Wollaeger, Ryan
name: Woosley, Stan E.
name: Wygoda, Nahliel
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present the first results of a comprehensive supernova (SN) radiative-transfer (RT) code-comparison initiative (StaNdaRT), where the emission from the same set of standardized test models is simulated by currently-used RT codes. A total of ten codes have been run on a set of four benchmark ejecta models of Type Ia supernovae. We consider two sub-Chandrasekhar-mass ($M_\mathrm{tot} = 1.0$ M$_\odot$) toy models with analytic density and composition profiles and two Chandrasekhar-mass delayed-detonation models that are outcomes of hydrodynamical simulations. We adopt spherical symmetry for all four models. The results of the different codes, including the light curves, spectra, and the evolution of several physical properties as a function of radius and time, are provided in electronic form in a standard format via a public repository. We also include the detailed test model profiles and several python scripts for accessing and presenting the input and output files. We also provide the code used to generate the toy models studied here. In this paper, we describe in detail the test models, radiative-transfer codes and output formats and provide access to the repository. We present example results of several key diagnostic features.
description: Accepted for publication in A&A. 27 pages, 12 figures (v4: updated to match published version). The ejecta models and output files from the simulations are available at https://github.com/sn-rad-trans/data1
A Double Main Sequence in the Globular Cluster NGC 6397
Creators: name: Milone, A. P.
name: Marino, A. F.
name: Piotto, G.
name: Bedin, L. R.
name: Anderson, J.
name: Aparicio, A.
name: Cassisi, S.
name: Rich, R. M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: High-precision multi-band HST photometry reveals that the main sequence (MS) of the globular cluster NGC 6397 splits into two components, containing ~30% and ~70% of the stars. This double sequence is consistent with the idea that the cluster hosts two stellar populations: (i) a primordial population that has a composition similar to field stars, and containing ~30% of the stars, and (ii) a second generation with enhanced sodium and nitrogen, depleted carbon and oxygen, and a slightly enhanced helium abundance (Delta Y~0.01). We examine the color difference between the two sequences across a variety of color baselines and find that the second sequence is anomalously faint in m_F336W. Theoretical isochrones indicate that this could be due to NH depletion.
description: 19 pages, 11 figures, accepted for pubblication in ApJ
Spectral density and metal-insulator phase transition in Mott insulators within RDMFT
Creators: name: Sharma, S.
name: Dewhurst, J. K.
name: Shallcross, S.
name: Gross, E. K. U.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present a method for calculating the spectrum of periodic solids within reduced density matrix functional theory. This method is validated by a detailed comparison of the angular momentum projected spectral density with that of well established many-body techniques, in all cases finding an excellent agreement. The physics behind the pressure induced insulator-metal phase transition in MnO is investigated. The driving mechanism of this transition is identified as increased crystal field splitting with pressure, resulting in a charge redistribution between the Mn $e_g$ and $t_2g$ symmetry projected states.
description: arXiv admin note: text overlap with arXiv:0912.1118
COVID-19 mass vaccination - an illustration of the impact of syringe choice on the effectiveness of mass vaccination campaigns
Creators: name: Roseline, Mazet
name: Luc, Choisnard
name: Julien, Leenhardt
name: Olivier, Epaulard
name: Etienne, Brudieu
name: Pierrick, Bedouch
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Medicine
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Cancer
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: In order to optimise the operational implementation of mass vaccination policies, it is critical to consider not only the supply of vaccines as well as each element of the vaccination process. This study, which was conducted in a vaccination center clearly shows how the choice of a syringe reference used during the covid-19 vaccination campaign influences the number of vaccine doses available. The results appear to be closely related to the type of vaccine used (COMIRNATY® and SPIKEVAX®). In this context, the choice of the right reference of syringe has major economic and organisational consequences on a global scale.
Universal curvature identities II
Creators: name: Gilkey, Peter B.
name: Park, JeongHyeong
name: Sekigawa, Kouei
Publisher: name: arXiv
Year: 2011
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53B20

description: We show that any universal curvature identity which holds in the Riemannian setting extends naturally to the pseudo-Riemannian setting. Thus the Euh-Park-Sekigawa identity also holds for pseudo-Riemannian manifolds. We study the Euler-Lagrange equations associated to the Chern-Gauss-Bonnet formula and show that as in the Riemannian setting, they are given solely in terms of curvature (and not in terms of covariant derivatives of curvature) even in the pseudo-Riemannian setting.
description: 15 pages
Axion detection with phonon-polaritons revisited
Creators: name: Marsh, David J. E.
name: McDonald, Jamie I.
name: Millar, Alexander J.
name: Schütte-Engel, Jan
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Materials Science (cond-mat.mtrl-sci)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: In the presence of a background magnetic field, axion dark matter induces an electric field and can thus excite phonon-polaritons in suitable materials. We revisit the calculation of the axion-photon conversion power output from such materials, accounting for finite volume effects, and material losses. Our calculation shows how phonon-polaritons can be converted to propagating photons at the material boundary, offering a route to detecting the signal. Using the dielectric functions of GaAs, Al$_2$O$_3$, and SiO$_2$, a fit to our loss model leads to a signal of lower magnitude than previous calculations. We demonstrate how knowledge of resonances in the dielectric function can directly be used to calculate the sensitivity of any material to axion dark matter. We argue that a combination of low losses encountered at $\mathcal{O}(1)$ K temperatures and near future improvements in detector dark count allow one to probe the QCD axion in the mass range $m_a\approx 100$ meV. This provides further impetus to examine novel materials and further develop detectors in the THz regime. We also discuss possible tuning methods to scan the axion mass.
description: 13 pages, 2 figures, 1 table, comments welcome. Updated journal version
title: Culling of bulls in Mozambique
Creators: name: Da Silva, Patrocinio Mariano
Publisher: name: The University of Edinburgh
Year: 1983
Subjects: subject: Annexe MSc Digitisation Project 2022 Block 51
subject: Culling
subject: Bulls
subject: Clinical examination
subject: Mozambique
subject: Lesions

description: The literature on the culling of bulls is reviewed. It shows that the process of culling bulls has become important in many countries both from the viewpoint of economic productivity of cattle as a disease control measure. Inspection and palpation of the bull external genitalia has been the most common method of examining bulls and of predicting reduced fertility. The reliability and the effectiveness of clinical examination in supporting decisions on culling bulls is investigated in this work. Material came from a beef unit located in the southern part of Mozambique and comprised 333 sections of testes and epididymes from 21 cull Afrikander bulls. The results showed that the clinical examination only detected approximately half of the microscopically abnormal testes. A similar result was found in the examination of the epididymes. The most common lesions observed were testicular fibrosis and chronic epididymitis. In a high percentage of bulls, lesions were present in associated testes and epididymes. The significance of the lesions is discussed and the main conclusion is that histopathology, without parallel semen and microbiological examination, is of limited value in understanding aetiology. A fuller investigation making more use of cull bulls should be carried out in Mozambique.
A multimodal approach for tracing lateralization along the olfactory pathway in the honeybee through electrophysiological recordings, morpho-functional imaging, and behavioural studies
Creators: name: Haase, Albrecht
name: Rigosi, Elisa
name: Frasnelli, Elisa
name: Trona, Federica
name: Tessarolo, Francesco
name: Vinegoni, Claudio
name: Anfora, Gianfranco
name: Vallortigara, Giorgio
name: Antolini, Renzo
Publisher: name: arXiv
Year: 2011
Subjects: subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Recent studies have revealed asymmetries between the left and right sides of the brain in invertebrate species. Here we present a review of a series of recent studies from our labs, aimed at tracing asymmetries at different stages along the honeybee's (Apis mellifera) olfactory pathway. These include estimates of the number of sensilla present on the two antennae, obtained by scanning electron microscopy, as well as electroantennography recordings of the left and right antennal responses to odorants. We describe investigative studies of the antennal lobes, where multi-photon microscopy is used to search for possible morphological asymmetries between the two brain sides. Moreover, we report on recently published results obtained by two-photon calcium imaging for functional mapping of the antennal lobe aimed at comparing patterns of activity evoked by different odours. Finally, possible links to the results of behavioural tests, measuring asymmetries in single-sided olfactory memory recall, are discussed.
description: 28 pages, 8 figures
Realizable time crystal of four silicon quantum dot qubits
Creators: name: Foulk, Nathan L.
name: Sarma, Sankar Das
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We demonstrate that exciting possible realizations of quantum Floquet matter are within reach for modern silicon spin qubits based in quantum dots, most notably the discrete time crystal (DTC). This is significant given that spin qubits have fallen behind other qubit architectures in terms of size and control. However, silicon spin qubits are especially well suited to this task as the charge noise that usually foils gate operations can now be leveraged as an asset in this time-crystal realization. We illustrate differences between prethermal phenomena and true time-crystalline spatiotemporal order. We demonstrate that even for a spin chain of four qubits, rich regime structures can be established by observing signatures of the discrete time crystal and the Floquet symmetry-protected topological regime both distinct from the thermal regime. We also analyze the persistence of these signatures at longer chain lengths, showing that the DTC lifetime grows exponentially with the system length and that these signatures may even be detectable for chains as small as three qubits. We also discuss the effects of longer pulse durations and the effectiveness of pulse sequences for converting the exchange interaction to an Ising model. Our theoretical predictions are well suited for immediate experimental implementations using currently existing quantum dot spin qubit systems.
description: 10 pages, 11 figures; Updated with published version of manuscript
Reducing scattering problems under cone potentials to normal form by global canonical transformations
Creators: name: Gorni, Gianluca
name: Zampieri, Gaetano
Publisher: name: arXiv
Year: 2012
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences
subject: 58F05 (Primary) 58F07, 70H05 (Secondary)

description: We introduce a class of Hamiltonian scattering systems which can be reduced to the "normal form" $\dot P=0$, $\dot Q=P$, by means of a global canonical transformation $ (P,Q)=A(p,q), p,q\in R^n$, defined through asymptotic properties of the trajectories. These systems are obtained requiring certain geometrical conditions on $\dot p=-\nabla V(q)$, $\dot q=p$, where $V$ is a bounded below "cone potential", i.e., the force $-\nabla V(q)$ always belongs to a closed convex cone which contains no straight lines. We can deal with very different asymptotic behaviours of the potential and the potential can undergo small perturbations in any arbitrary compact set without losing the existence and the properties of $A$.
Universal Anomaly of Dynamics at Phase Transition Points Induced by Pancharatnam-Berry Phase
Creators: name: Zhang, Jia-Yuan
name: Yin, Xia
name: liu, Ming-Yu
name: Zhao, Jize
name: Ding, Yang
name: Chang, Jun
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Recently, dynamical anomalies more than critical slowing down are often observed near both the continuous and first-order phase transition points. We propose that the universal anomalies could originate from the geometric phase effects. A Pancharatnam-Berry phase is accumulated continuously in quantum states with the variation of tuning parameters. Phase transitions are supposed to induce a abrupt shift of the geometric phase. In our multi-level quantum model, the quantum interference induced by the geometric phase could prolong or shorten the relaxation times of excited states at phase transition points, which agrees with the experiments, models under sudden quenches and our semi-classical model. Furthermore, we find that by setting a phase shift of \text{\ensuremathπ}, the excited state could be decoupled from the ground state by quantum cancellation so that the relaxation time even could diverge to infinity. Our work introduces the geometric phase to the study of conventional phase transitions and quantum phase transition, and could substantially extend the dephasing time of qubits for quantum computing.
description: 6 pages, 3 figures, minor revision
Generalizable machine learning for stress monitoring from wearable devices: A systematic literature review
Creators: name: Vos, Gideon
name: Trinh, Kelly
name: Sarnyai, Zoltan
name: Azghadi, Mostafa Rahimi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences
subject: I.1

description: Introduction. The stress response has both subjective, psychological and objectively measurable, biological components. Both of them can be expressed differently from person to person, complicating the development of a generic stress measurement model. This is further compounded by the lack of large, labeled datasets that can be utilized to build machine learning models for accurately detecting periods and levels of stress. The aim of this review is to provide an overview of the current state of stress detection and monitoring using wearable devices, and where applicable, machine learning techniques utilized. Methods. This study reviewed published works contributing and/or using datasets designed for detecting stress and their associated machine learning methods, with a systematic review and meta-analysis of those that utilized wearable sensor data as stress biomarkers. The electronic databases of Google Scholar, Crossref, DOAJ and PubMed were searched for relevant articles and a total of 24 articles were identified and included in the final analysis. The reviewed works were synthesized into three categories of publicly available stress datasets, machine learning, and future research directions. Results. A wide variety of study-specific test and measurement protocols were noted in the literature. A number of public datasets were identified that are labeled for stress detection. In addition, we discuss that previous works show shortcomings in areas such as their labeling protocols, lack of statistical power, validity of stress biomarkers, and generalization ability. Conclusion. Generalization of existing machine learning models still require further study, and research in this area will continue to provide improvements as newer and more substantial datasets become available for study.
description: https://www.sciencedirect.com/science/article/pii/S1386505623000436
title: "Piccolo busto di Serapide", arte romana, inv. CCXCVII (ITA/EN)
title: Scheda catalogo digitale Borghese
titleType: AlternativeTitle
Creators: name: Ciccarello, Giulia
name: Galleria Borghese
Publisher: name: Galleria Borghese
Year: 2024

description: Pubblicazione delle schede delle opere conservate nel museo ed estratte dal catalogo digitale di

Galleria Borghese, nelle due versioni esistenti online, in italiano e inglese.

Collegamento al catalogo digitale:

ITA: https://www.collezionegalleriaborghese.it/

EN: https://www.collezionegalleriaborghese.it/en
High-Q aluminum nitride photonic crystal nanobeam cavities
Creators: name: Pernice, W. H. P.
name: Xiong, C.
name: Schuck, C.
name: Tang, H. X.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We demonstrate high optical quality factors in aluminum nitride (AlN) photonic crystal nanobeam cavities. Suspended AlN photonic crystal nanobeams are fabricated in sputter-deposited AlN-on-insulator substrates using a self-protecting release process. Employing one-dimensional photonic crystal cavities coupled to integrated optical circuits we measure quality factors up to 146,000. By varying the waveguide-cavity coupling gap, extinction ratios in excess of 15 dB are obtained. Our results open the door for integrated photonic bandgap structures made from a low loss, wide-transparency, nonlinear optical material system.
On Lie-algebraic solutions of the type IIB matrix model
Creators: name: Chatzistavrakidis, Athanasios
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A systematic search for Lie algebra solutions of the type IIB matrix model is performed. Our survey is based on the classification of all Lie algebras for dimensions up to five and of all nilpotent Lie algebras of dimension six. It is shown that Lie-type solutions of the equations of motion of the type IIB matrix model exist and they correspond to certain nilpotent and solvable Lie algebras. Their representation in terms of Hermitian matrices is discussed in detail. These algebras give rise to certain non-commutative spaces for which the corresponding star-products are provided. Finally the issue of constructing quantized compact nilmanifolds and solvmanifolds based on the above algebras is addressed.
description: 22 pages
Optical Saturation Produces Spurious Evidence for Photoinduced Superconductivity in K$_{3}$C$_{60}$
Creators: name: Dodge, J. Steven
name: Lopez, Leya
name: Sahota, Derek G.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We discuss a systematic uncertainty in time-resolved optical conductivity measurements that becomes important at high pump intensities. We show that common optical nonlinearities can distort the photoconductivity depth profile, and by extension distort the photoconductivity spectrum. We show evidence that this distortion is present in existing measurements on K$_{3}$C$_{60}$, and describe how it may create the appearance of photoinduced superconductivity where none exists. Similar errors may emerge in other pump-probe spectroscopy measurements, and we discuss how to correct for them.
description: 5 pages, 5 figures, supplemental material. v2: Some acknowledgments removed upon request. v3: Corrected an error in Eq. (5) and revised the affected figures and discussion accordingly. Added sections to supplemental material. v4: Updated title; other minor changes suggested by journal editors
An Example for the Use of Bitwise Operations in Programming
Creators: name: Yordzhev, Krasimir Yankov
Publisher: name: arXiv
Year: 2012
Subjects: subject: Other Computer Science (cs.OH)
subject: Combinatorics (math.CO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: 68N15, 68R05, 05A18

description: This piece of work presents a meaningful example for the advantages of using bitwise operations for creating effective algorithms in programming. A task connected with mathematical modeling in weaving industry is examined and computed.
description: Proceedings of the Thirty Eighth Spring Conference of the Union of Bulgarian Mathematicians, Borovetz, April 1-?5, 2009
Spinor Walls in Five-Dimensional Warped Spacetime
Creators: name: Cui, Zheng-Quan
name: Liu, Yu-Xiao
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study domain wall solutions of a real spinor field coupling with gravitation in five dimensions. We find that the nonlinear spinor field supports a class of soliton configurations which could be viewed as a wall embedded in five dimensions. We begin with an illuminating solution of the spinor field in the absence of gravitation. In a further investigation, we exhibit three sets of solutions of the spinor field with nonconstant curvature bulk spacetimes and three sets of solutions corresponding to three constant curvature bulk spacetimes. We demonstrate that some of these solutions in specific conditions have the energy density distributions of domain walls for the spinor field, where the scalar curvature is regular everywhere. Therefore, the configurations of these walls can be interpreted as spinor walls which are interesting spinor field realizations of domain walls. In order to investigate the stability of these spinor configurations, the linear perturbations are considered. The localization of the zero mode of tensor perturbation is also discussed.
description: 31 pages,5 figures; a comment added in conclusion; matches the published version
Reduced effective spin-orbital degeneracy and spin-orbital ordering in paramagnetic transition metal oxides: Sr2IrO4 vs. Sr2RhO4
Creators: name: Martins, Cyril
name: Aichhorn, Markus
name: Vaugier, Loig
name: Biermann, Silke
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We discuss the notions of spin-orbital polarization and ordering in paramagnetic materials, and address their consequences in transition metal oxides. Extending the combined density functional and dynamical mean field theory scheme to the case of materials with large spin-orbit interactions, we investigate the electronic excitations of the paramagnetic phases of Sr2IrO4 and Sr2RhO4. We show that the interplay of spin-orbit interactions, structural distortions and Coulomb interactions suppresses spin-orbital fluctuations. As a result, the room temperature phase of Sr2IrO4 is a paramagnetic spin-orbitally ordered Mott insulator. In Sr2RhO4, the effective spin-orbital degeneracy is reduced, but the material remains metallic, due to both, smaller spin-orbit and smaller Coulomb interactions. We find excellent agreement of our ab-initio calculations for Sr2RhO4 with angle-resolved photoemission, and make predictions for spectra of the paramagnetic phase of Sr2IrO4.
description: 4+ pages, 4 figures
Intrinsic Dimension for Large-Scale Geometric Learning
Creators: name: Stubbemann, Maximilian
name: Hanika, Tom
name: Schneider, Friedrich Martin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: The concept of dimension is essential to grasp the complexity of data. A naive approach to determine the dimension of a dataset is based on the number of attributes. More sophisticated methods derive a notion of intrinsic dimension (ID) that employs more complex feature functions, e.g., distances between data points. Yet, many of these approaches are based on empirical observations, cannot cope with the geometric character of contemporary datasets, and do lack an axiomatic foundation. A different approach was proposed by V. Pestov, who links the intrinsic dimension axiomatically to the mathematical concentration of measure phenomenon. First methods to compute this and related notions for ID were computationally intractable for large-scale real-world datasets. In the present work, we derive a computationally feasible method for determining said axiomatic ID functions. Moreover, we demonstrate how the geometric properties of complex data are accounted for in our modeling. In particular, we propose a principle way to incorporate neighborhood information, as in graph data, into the ID. This allows for new insights into common graph learning procedures, which we illustrate by experiments on the Open Graph Benchmark.
description: 18 pages, 4 tables, 3 figures. This is the version accepted to TMLR, see: https://openreview.net/forum?id=85BfDdYMBY
Low-temperature thermodynamics of the classical frustrated ferromagnetic chain in magnetic field
Creators: name: Dmitriev, D. V.
name: Krivnov, V. Ya.
name: Kuzminyh, N. Yu.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Low-temperature magnetization curves of the classical frustrated ferromagnetic chain in the external magnetic field near the transition point between the ferromagnetic and the helical phases is studied. It is shown that the calculation of the partition function in the scaling limit reduces to the solution of the Schrödinger equation of the special form for the quantum particle. It is proposed that the magnetization of the classical model in the ferromagnetic part of the phase diagram including the transition point defines the universal scaling function which is valid for quantum model as well. Explicit analytical formulae for the magnetization are given in the limiting cases of low and high magnetic fields. The influence of the easy-axis anisotropy on the magnetic properties of the model is studied. It is shown that even small anisotropy essentially changes the behavior of the susceptibility in the vicinity of the transition point.
description: 14 pages, 5 figures
Hubbard Models for Quasicrystalline Potentials
Creators: name: Gottlob, Emmanuel
name: Schneider, Ulrich
Publisher: name: arXiv
Year: 2022
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Quasicrystals are long-range ordered, yet not periodic, and thereby present a fascinating challenge for condensed matter physics, as one cannot resort to the usual toolbox based on Bloch's theorem. Here, we present a numerical method for constructing the Hubbard Hamiltonian of non-periodic potentials without making use of Bloch's theorem and apply it to the case of an eightfold rotationally symmetric 2D optical quasicrystal that was recently realized using cold atoms. We construct maximally localised Wannier functions and use them to extract on-site energies, tunneling amplitudes, and interaction energies. In addition, we introduce a configuration-space representation, where sites are ordered in terms of shape and local environment, that leads to a compact description of the infinite-size quasicrystal in which all Hamiltonian parameters can be expressed as smooth functions. This configuration-space picture allows one to construct arbitrarily large tight-binding graphs for numerical many-body calculations and enables new analytic arguments on the topological structure and many-body physics of these models, for instance the conclusion that this quasicrystal will host unit-filling Mott insulators in the thermodynamic limit.
description: 9 pages, 12 figures, plus appendix; minor changes
The MSSM Spectrum from (0,2)-Deformations of the Heterotic Standard Embedding
Creators: name: Braun, Volker
name: Candelas, Philip
name: Davies, Rhys
name: Donagi, Ron
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Algebraic Geometry (math.AG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We construct supersymmetric compactifications of E_8 \times E_8 heterotic string theory which realise exactly the massless spectrum of the Minimal Supersymmetric Standard Model (MSSM) at low energies. The starting point is the standard embedding on a Calabi-Yau threefold which has Hodge numbers (h^11,h^21) = (1,4) and fundamental group Z_12, which gives an E_6 grand unified theory with three net chiral generations. The gauge symmetry is then broken to that of the standard model by a combination of discrete Wilson lines and continuous deformation of the gauge bundle. On eight distinct branches of the moduli space, we find stable bundles with appropriate cohomology groups to give exactly the massless spectrum of the MSSM.
description: 37 pages including appendices
Exploring the cosmological synergy between galaxy cluster and cosmic void number counts
Creators: name: Pelliciari, Davide
name: Contarini, Sofia
name: Marulli, Federico
name: Moscardini, Lauro
name: Giocoli, Carlo
name: Lesci, Giorgio Francesco
name: Dolag, Klaus
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Galaxy clusters and cosmic voids, the most extreme objects of our Universe in terms of mass and size, trace two opposite sides of the large-scale matter density field. By studying their abundance as a function of their mass and radius, respectively, i.e. the halo mass function (HMF) and void size function (VSF), it is possible to achieve fundamental constraints on the cosmological model. While the HMF has already been extensively exploited providing robust constraints on the main cosmological model parameters (e.g. $Ω_{\rm m}$, $σ_8$ and $S_8$), the VSF is still emerging as a viable and effective cosmological probe. Given the expected complementarity of these statistics, in this work we aim at estimating the costraining power deriving from their combination. To this end, we exploit realistic mock samples of galaxy clusters and voids extracted from state-of-the-art large hydrodynamical simulations, in the redshift range $0.2 \leq z \leq 1$. We perform an accurate calibration of the free parameters of the HMF and VSF models, needed to take into account the differences between the types of mass tracers used in this work and those considered in previous literature analyses. Then, we obtain constraints on $Ω_{\rm m}$ and $σ_8$ by performing a Bayesian analysis. We find that cluster and void counts represent powerful independent and complementary probes to test the cosmological framework. In particular, the constraining power of the HMF on $Ω_{\rm m}$ and $σ_8$ improves drastically with the VSF contribution, increasing the $S_8$ constraint precision by a factor of about 60%.
description: 14 pages, 8 figures - published in MNRAS
Domain Wall Renormalization Group Analysis of 2-dimensional Ising Model
Creators: name: Aoki, Ken-Ichi
name: Kobayashi, Tamao
name: Tomita, Hiroshi
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Using a recently proposed new renormalization group method (tensor renormalization group), we analyze the Ising model on the 2-dimensional square lattice. For the lowest order approximation with two domain wall states, it realizes the idea of coarse graining of domain walls. We write down explicit analytic renormalization transformation and prove that the picture of the coarse graining of the physical domain walls does hold for all physical renormalization group flows. We solve it to get the fixed point structure and obtain the critical exponents and the critical temperature. These results are very near to the exact values. We also briefly report the improvement using four domain wall states.
description: 12 pages, 30 figures
Successor Sets of Discrete-time Nonlinear Systems Using Hybrid Zonotopes
Creators: name: Siefert, Jacob A.
name: Bird, Trevor J.
name: Koeln, Justin P.
name: Jain, Neera
name: Pangborn, Herschel C.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper presents identities for calculating over-approximated successor sets of discrete-time nonlinear systems using hybrid zonotopes. The proposed technique extends the state-update set construct, previously developed for linear hybrid systems, to nonlinear systems. Forward reachability of nonlinear systems can then be performed using only projection, intersection, and Cartesian product set operations with the state-update set. It is shown that use of an over-approximation of the state-update set yields over-approximations of successor sets. A technique to over-approximate a nonlinear function using a special ordered set approximation, equivalently represented as a hybrid zonotope, is then presented. A numerical example of a nonlinear system controlled by a piecewise-affine control law demonstrates that the approach provides a computationally-efficient and tight over-approximation of the closed-loop reachable set.
Non-Hermitian boundary spectral winding
Creators: name: Ou, Zuxuan
name: Wang, Yucheng
name: Li, Linhu
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Spectral winding of complex eigenenergies represents a topological aspect unique in non-Hermitian systems, which vanishes in one-dimensional (1D) systems under the open boundary conditions (OBC). In this work, we discover a boundary spectral winding in two-dimensional non-Hermitian systems under the OBC, originating from the interplay between Hermitian boundary localization and non-Hermitian non-reciprocal pumping. Such a nontrivial boundary topology is demonstrated in a non-Hermitian breathing Kagome model with a triangle geometry, whose 1D boundary mimics a 1D non-Hermitian system under the periodic boundary conditions with nontrivial spectral winding. In a trapezoidal geometry, such a boundary spectral winding can even co-exist with corner accumulation of edge states, instead of extended ones along 1D boundary of a triangle geometry. An OBC type of hybrid skin-topological effect may also emerge in a trapezoidal geometry, provided the boundary spectral winding completely vanishes. By studying the Green's function, we unveil that the boundary spectral winding can be detected from a topological response of the system to a local driving field, offering a realistic method to extract the nontrivial boundary topology for experimental studies.
description: 10 pages, 7 figures. Comments are welcome
Estimation of Coupling Constants of a Three-Spin Chain: Case Study of Hamiltonian Tomography with NMR
Creators: name: Lapasar, Elham Hosseini
name: Maruyama, Koji
name: Burgarth, Daniel
name: Takui, Takeji
name: Kondo, Yasushi
name: Nakahara, Mikio
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: It has been shown that inter-spin interaction strengths in a spins-1/2 chain can be evaluated by accessing one of the edge spins only. We demonstrate this experimentally for the simplest case, a three-spin chain, with nuclear magnetic resonance (NMR) technique. The three spins in the chain interact through nearest-neighbor Ising interactions under site-dependent transverse fields. The employed molecule is an alanine containing three $^{13}$C nuclei, each of which has spin-1/2.
description: 7 pages, 18 figures
Preference-Learning Emitters for Mixed-Initiative Quality-Diversity Algorithms
Creators: name: Gallotta, Roberto
name: Arulkumaran, Kai
name: Soros, L. B.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: In mixed-initiative co-creation tasks, wherein a human and a machine jointly create items, it is important to provide multiple relevant suggestions to the designer. Quality-diversity algorithms are commonly used for this purpose, as they can provide diverse suggestions that represent salient areas of the solution space, showcasing designs with high fitness and wide variety. Because generated suggestions drive the search process, it is important that they provide inspiration, but also stay aligned with the designer's intentions. Additionally, often many interactions with the system are required before the designer is content with a solution. In this work, we tackle these challenges with an interactive constrained MAP-Elites system that leverages emitters to learn the preferences of the designer and then use them in automated steps. By learning preferences, the generated designs remain aligned with the designer's intent, and by applying automatic steps, we generate more solutions per user interaction, giving a larger number of choices to the designer and thereby speeding up the search. We propose a general framework for preference-learning emitters (PLEs) and apply it to a procedural content generation task in the video game Space Engineers. We built an interactive application for our algorithm and performed a user study with players.