cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Unexpected Properties of Alkali Metal Iron Selenide Superconductors
Creators: name: Dagotto, Elbio
Publisher: name: arXiv
Year: 2012
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The iron-based superconductors that contain FeAs layers as the fundamental building block in the crystal structures have been rationalized in the past using ideas based on the Fermi Surface nesting of hole and electron pockets when in the presence of weak Hubbard $U$ interactions. This approach seemed appropriate considering the small values of the magnetic moments in the parent compounds and the clear evidence based on photoemission experiments of the required electron and hole pockets. However, recent results in the context of alkali metal iron selenides, with generic chemical composition $A_x$Fe$_{2-y}$Se$_2$ ($A$ = alkali element), have drastically challenged those previous ideas since at particular compositions $y$ the low-temperature ground states are insulating and display antiferromagnetic magnetic order with large iron magnetic moments. Moreover, angle resolved photoemission studies have revealed the absence of hole pockets at the Fermi level in these materials. The present status of this exciting area of research, with the potential to alter conceptually our understanding of the iron-based superconductors, is here reviewed, covering both experimental and theoretical investigations. Other recent related developments are also briefly reviewed, such as the study of selenide two-leg ladders and the discovery of superconductivity in a single layer of FeSe. The conceptual issues considered established for the alkali metal iron selenides, as well as the several issues that still require further work, are discussed in the text.
description: By invitation for Rev. Mod. Physics; submitted to RMP in August 2012
Arbeitsgemeinschaften für archäologische Denkmalpflege im Regierungsbezirk Osnabrück
Creators: name: Tempel, Wolf-Dieter
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: -
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 42 (1973): Nachrichten aus Niedersachsens Urgeschichte
Observation of $1/k^4$-tails after expansion of Bose-Einstein Condensates with impurities
Creators: name: Cayla, Hugo
name: Massignan, Pietro
name: Giamarchi, Thierry
name: Aspect, Alain
name: Westbrook, Christoph I.
name: Clément, David
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We measure the momentum density in a Bose-Einstein condensate (BEC) with dilute spin impurities after an expansion in the presence of interactions. We observe tails decaying as $1/k^4$ at large momentum $k$ in the condensate and in the impurity cloud. These algebraic tails originate from the impurity-BEC interaction, but their amplitudes greatly exceed those expected from two-body contact interactions at equilibrium in the trap. Furthermore, in the absence of impurities, such algebraic tails are not found in the BEC density measured after the interaction-driven expansion. These results highlight the key role played by impurities when present, a possibility that had not been considered in our previous work [Phys. Rev. Lett. 117, 235303 (2016)]. Our measurements suggest that these unexpected algebraic tails originate from the non-trivial dynamics of the expansion in the presence of impurity-bath interactions.
description: 6 pages, 6 figures
Altsteinzeitfunde in eiszeitlichen Schottern der Weser bei Stedebergen, Kr. Verden
Creators: name: Oldenburg, Heinz
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: -
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 42 (1973): Nachrichten aus Niedersachsens Urgeschichte
Probegrabung auf einer Rössener Siedlung in Kalefeld, Kr. Osterode am Harz
Creators: name: Löbert, Horst
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: -
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 42 (1973): Nachrichten aus Niedersachsens Urgeschichte
On the role of coupled-clusters' full triple and perturbative quadruple excitations on rovibrational spectra of van der Waals complexes
Creators: name: Jankowski, Piotr
name: Grabowska, Ewelina
name: Szalewicz, Krzysztof
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biophysics
subject: Biochemistry
subject: Physical Sciences not elsewhere classified
subject: Cell Biology
subject: Neuroscience
subject: Pharmacology
subject: Chemical Sciences not elsewhere classified
subject: Immunology
subject: FOS: Clinical medicine
subject: Marine Biology
subject: Infectious Diseases
subject: FOS: Health sciences

description: The importance of coupled clusters iterative triple and noniterative quadruple, T(Q), electron excitations on the potential energy surfaces (PESs) of van der Waals molecules is examined for H2–CO. The evaluation of this importance is performed by comparing theoretical spectra with experiment. Somewhat surprisingly, although the T(Q) contributions to interaction energies are below 3%, the inclusion of them reduces the error of theory with respect to experiment by an order of magnitude and qualitative agreement of the spectra in some regions is achieved only when they are included. The main reason for these observations is that the T(Q) effects significantly change the anisotropy of the PES.
Three-Body Problem in Modified Dynamics
Creators: name: Shenavar, Hossein
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: General properties of the three-body problem in a model of modified dynamics are investigated. It is shown that the three-body problem in this model shares some characters with the similar problem in Newtonian dynamics. Moreover, the planar restricted three-body problem is solved analytically for this type of extended gravity and it is proved that under certain conditions, which generally happen at galactic and extragalactic scales, the orbits around $L_{4}$ and $L_{5}$ Lagrange points are stable. Furthermore, a code is provided to compare the behavior of orbits in the restricted three-body problem under Newtonian and modified dynamics. Orbit integrations based on this code show contrasting orbital behavior under the two dynamics and specially exhibit in a qualitative way that the rate of ejections is smaller in the modified dynamics compared to Newtonian gravity. These results could help us to search for observational signatures of extended gravities.
description: 44 pages, 27 figures, 2 tables. Some discussions have been added. Also, Fig. 1 is updated to remove an error in the earlier version. The MATHEMATICA codes related to orbit integration are available via author's GitHub repository at https://github.com/Shenavar/ThreeBodyinMOD . Accepted for publication in Celestial Mechanics and Dynamical Astronomy
Permutations over cyclic groups
Creators: name: Nagy, Zoltán Lóránt
Publisher: name: arXiv
Year: 2012
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: Generalizing a result in the theory of finite fields we prove that, apart from a couple of exceptions that can be classified, for any elements $a_1,...,a_m$ of the cyclic group of order $m$, there is a permutation $π$ such that $1a_{π(1)}+...+ma_{π(m)}=0$.
MagNetUS 2021 - Day 1 - E. Scime - Kinetic Scale Velocity Distribution Function Measurements in the PHAse SPace MApping Experiment
Creators: name: Scime, Earl
Publisher: name: Zenodo
Year: 2021

description: MagNetUS 2021 - Day 1
 Speaker: Earl Scime
 Title: Kinetic Scale Velocity Distribution Function Measurements in the PHAse SPace MApping Experiment
Moonlighting chaperone activity of the enzyme PqsE contributes to RhlR-controlled virulence of Pseudomonas aeruginosa
Creators: name: Borgert, Sebastian Roman
name: Henke, Steffi
name: Witzgall, Florian
name: Schmelz, Stefan
name: Zur Lage, Susanne
name: Hotop, Sven-Kevin
name: Stephen, Steffi
name: Lübken, Dennis
name: Krüger, Jonas
name: Gomez, Nicolas Oswaldo
name: Van Ham, Marco
name: Jänsch, Lothar
name: Kalesse, Markus
name: Pich, Andreas
name: Brönstrup, Mark
name: Häussler, Susanne
name: Blankenfeldt, Wulf
Publisher: name: [London] : Nature Publishing Group UK
Year: 2022
Subjects: subject: Protein Folding
subject: Pseudomonas aeruginosa
subject: Transcription Factors
subject: Virulence
subject: chaperone
subject: Dewey Decimal Classification::500 | Naturwissenschaften

description: Pseudomonas aeruginosa is a major cause of nosocomial infections and also leads to severe exacerbations in cystic fibrosis or chronic obstructive pulmonary disease. Three intertwined quorum sensing systems control virulence of P. aeruginosa, with the rhl circuit playing the leading role in late and chronic infections. The majority of traits controlled by rhl transcription factor RhlR depend on PqsE, a dispensable thioesterase in Pseudomonas Quinolone Signal (PQS) biosynthesis that interferes with RhlR through an enigmatic mechanism likely involving direct interaction of both proteins. Here we show that PqsE and RhlR form a 2:2 protein complex that, together with RhlR agonist N-butanoyl-L-homoserine lactone (C4-HSL), solubilizes RhlR and thereby renders the otherwise insoluble transcription factor active. We determine crystal structures of the complex and identify residues essential for the interaction. To corroborate the chaperone-like activity of PqsE, we design stability-optimized variants of RhlR that bypass the need for C4-HSL and PqsE in activating PqsE/RhlR-controlled processes of P. aeruginosa. Together, our data provide insight into the unique regulatory role of PqsE and lay groundwork for developing new P. aeruginosa-specific pharmaceuticals.
Casimir Energy for a Coupled Fermion-Soliton System
Creators: name: Shahkarami, Leila
name: Mohammadi, Azadeh
name: Gousheh, Siamak Sadat
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we compute the Casimir energy for a coupled fermion-pseudoscalar field system. In the model considered in this paper the pseudoscalar field is \textit{static} and \textit{prescribed} with two adjustable parameters. These parameters determine the values of the field at infinity ($\pm θ_0$) and its scale of variation ($μ$). One can build up a field configuration with arbitrary topological charge by changing $θ_0$, and interpolate between the extreme adiabatic and non-adiabatic regimes by changing $μ$. This system is exactly solvable and therefore we compute the Casimir energy exactly and unambiguously by using an energy density subtraction scheme. We show that in general the Casimir energy goes to zero in the extreme adiabatic limit, and in the extreme non-adiabatic limit when the asymptotic values of the pseudoscalar field properly correspond to a configuration with an arbitrary topological charge. Moreover, in general the Casimir energy is always positive and on the average an increasing function of $θ_0$ and always has local maxima when there is a zero mode, showing that these configurations are energetically unfavorable. We also compute and display the energy densities associated with the spectral deficiencies in both of the continua, and those of the bound states. We show that the energy densities associated with the distortion of the spectrum of the states with $E>0$ and $E<0$ are mirror images of each other. We also compute and display the Casimir energy density. Finally we compute the energy of a system consisting of a soliton and a valance electron and show that the Casimir energy of the system is comparable with the binding energy.
description: 11 pages, 6 figures
Variational Quantum Optimization of Nonlocality in Noisy Quantum Networks
Creators: name: Doolittle, Brian
name: Bromley, Tom
name: Killoran, Nathan
name: Chitambar, Eric
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The inherent noise and complexity of quantum communication networks leads to challenges in designing quantum network protocols using classical methods. To address this issue, we develop a variational quantum optimization framework that simulates quantum networks on quantum hardware and optimizes the network using differential programming techniques. We use our hybrid framework to optimize nonlocality in noisy quantum networks. On the noisy IBM quantum computers, we demonstrate our framework's ability to maximize quantum nonlocality. On a classical simulator with a static noise model, we investigate the noise robustness of quantum nonlocality with respect to unital and nonunital channels. In both cases, we find that our optimization methods can reproduce known results, while uncovering interesting phenomena. When unital noise is present we find numerical evidence suggesting that maximally entangled state preparations yield maximal nonlocality. When nonunital noise is present we find that nonmaximally entangled states can yield maximal nonlocality. Thus, we show that variational quantum optimization is a practical design tool for quantum networks in the near-term. In the long-term, our variational quantum optimization techniques show promise of scaling beyond classical approaches and can be deployed on quantum network hardware to optimize quantum communication protocols against their inherent noise.
description: 28 pages, 16 figures, 1 table
Ein frühbronzezeitlicher Grabhügel auf dem Rotenberg bei Pöhlde, Kr. Osterode a. H.
Creators: name: Claus, Martin
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: -
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 42 (1973): Nachrichten aus Niedersachsens Urgeschichte
Directly Measuring the Tensor Structure of the Scalar Coupling to Gauge Bosons
Creators: name: Stolarski, Daniel
name: Vega-Morales, Roberto
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Kinematic distributions in the decays of the newly discovered resonance to four leptons can provide a direct measurement of the tensor structure of the particle's couplings to gauge bosons. Even if the particle is shown to be a parity even scalar, measuring this tensor structure is a necessary step in determining if this particle is responsible for giving mass to the Z. We consider a Standard Model like coupling as well as coupling via a dimension five operator to either ZZ or Zγ. We show that using full kinematic information from each event allows discrimination between renormalizable and higher dimensional coupling to ZZ at the 95% confidence level with O(50) signal events, and coupling to Zγcan be distinguished with as few as 20 signal events. This shows that these measurements can be useful even with this year's LHC data.
description: 7 pages, 5 figures; typos corrected, references added
Archäologische Kommission für Niedersachsen e.V. Bericht über die Tagung in Bederkesa vom 4. bis 6. Oktober 1973
Creators: name: Jankuhn, Herbert
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: -
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 42 (1973): Nachrichten aus Niedersachsens Urgeschichte
A perturbative approach to multireference equation-of-motion coupled cluster
Creators: name: Lechner, Marvin H.
name: Izsák, Róbert
name: Nooijen, Marcel
name: Neese, Frank
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biophysics
subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: Biotechnology
subject: Mathematical Sciences not elsewhere classified

description: We introduce a variant of the multireference equation-of-motion coupled-cluster (MR-EOMCC) method where the amplitudes used for the similarity transformations are estimated from perturbation theory. Consequently, the new variant retains the many-body formalism, a reliance on at most two-body densities, and the state-universal character. As a non-iterative variant, computational costs are reduced, and no convergence difficulties with near-singular amplitudes can arise. Its performance was evaluated on several test sets covering transition metal atoms, small diatomics, and organic molecules against (near-)full CI quality reference data. We further highlight its efficacy on the weakly avoided crossing of LiF and place MR-EOMCC and the new variant into context with linear response theory. The accuracy of the variant was found to be at least on par with expectations for multireference perturbation theories, judging by the NEVPT2 method. The variant can be especially useful in multistate situations where the high accuracy of the iterative MR-EOMCC method is not required.
Manipulating Non-Abelian Anyons in a Chiral Multichannel Kondo Model
Creators: name: Lotem, Matan
name: Sela, Eran
name: Goldstein, Moshe
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Non-Abelian anyons are fractional excitations of gapped topological models believed to describe certain topological superconductors or quantum Hall states. Here, we provide the first numerical evidence that they emerge as independent entities also in gapless electronic models. Starting from a multi-impurity multichannel chiral Kondo model, we introduce a novel mapping to a single-impurity model, amenable to Wilson's numerical renormalization group. We extract its spectral degeneracy structure and fractional entropy, and calculate the $F$ matrices, which encode the topological information regarding braiding of anyons, directly from impurity spin-spin correlations. Impressive recent advances on realizing multichannel Kondo systems with chiral edges may thus bring anyons into reality sooner than expected.
description: 5 pages, 3 figures + Supplemental material - published version
Gerhard Mildenberger: Römerzeitliche Siedlungen in Nordhessen
Creators: name: Rosenstock, Dirk
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Rezension zu: Gerhard Mildenberger: Römerzeitliche Siedlungen in Nordhessen. Kasseler Beiträge zur Vor- und Frühgeschichte, Bd. 3. (N. G. Elwert Verlag), Marburg, 1972. 111 Seiten, 27 Tafeln, davon 10 Fototafeln, 7 Karten und 3 Tabellen
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 42 (1973): Nachrichten aus Niedersachsens Urgeschichte
Eine Blattspitze des Mittelpaläolithikums von Sülbeck, Stadt Einbeck, Kr. Northeim (früher Kr. Einbeck)
Creators: name: Grote, Klaus
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: -
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 44 (1975): Nachrichten aus Niedersachsens Urgeschichte
Eiserne Waffen und Werkzeuge aus dem Landkreise Peine
Creators: name: Rehbein, Fritz
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: -
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 44 (1975): Nachrichten aus Niedersachsens Urgeschichte
Antiquark nuggets as dark matter: New constraints and detection prospects
Creators: name: Gorham, Peter. W.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Current evidence for dark matter in the universe does not exclude heavy composite nuclear-density objects consisting of bound quarks or antiquarks over a significant range of masses. Here we analyze one such proposed scenario, which hypothesizes antiquark nuggets with a range of log10(B) = 24-30 with specific predictions for spectral emissivity via interactions with normal matter. We find that, if these objects make up the majority of the dark matter density in the solar neighborhood, their radiation efficiency in solids is marginally constrained, due to limits from the total geothermal energy budget of the Earth. At allowed radiation efficiencies, the number density of such objects can be constrained to be well below dark matter densities by existing radio data over a mass range currently not restricted by other methods.
description: 6 pages, 3 figures, revised references; submitted to PRD
Positron accumulation in the GBAR experiment
Creators: name: Blumer, P.
name: Charlton, M.
name: Chung, M.
name: Clade, P.
name: Comini, P.
name: Crivelli, P.
name: Dalkarov, O.
name: Debu, P.
name: Dodd, L.
name: Douillet, A.
name: Guellati, S.
name: Hervieux, P. -A
name: Hilico, L.
name: Indelicato, P.
name: Janka, G.
name: Jonsell, S.
name: Karr, J. -P.
name: Kim, B. H.
name: Kim, E. S.
name: Kim, S. K.
name: Ko, Y.
name: Kosinski, T.
name: Kuroda, N.
name: Latacz, B. M.
name: Lee, B.
name: Lee, H.
name: Lee, J.
name: Leitee, A. M. M.
name: Leveque, K.
name: Lim, E.
name: Liszkay, L.
name: Lotrus, P.
name: Lunney, D.
name: Manfredi, G.
name: Mansoulie, B.
name: Matusiak, M.
name: Mornacchi, G.
name: Nesvizhevsky, V.
name: Nez, F.
name: Niang, S.
name: Nishi, R.
name: Ohayon, B.
name: Park, K.
name: Paul, N.
name: Perez, P.
name: Procureur, S.
name: Radics, B.
name: Regenfus, C.
name: Reymond, J. -M.
name: Reynaud, S.
name: Rousse, J. -Y.
name: Rousselle, O.
name: Rubbia, A.
name: Rzadkiewicl, J.
name: Sacquin, Y.
name: Schmidt-Kaler, F.
name: Staszczak, M.
name: Szymczyk, K.
name: Tanaka, T.
name: Tuchming, B.
name: Vallage, B.
name: Voronin, A.
name: van der Werf, D. P.
name: Wolf, S.
name: Won, D.
name: Wronka, S.
name: Yamazaki, Y.
name: Yoo, K. H.
name: Yzombard, P.
name: Baker, C. J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We present a description of the GBAR positron (e+) trapping apparatus, which consists of a three stage Buffer Gas Trap (BGT) followed by a High Field Penning Trap (HFT), and discuss its performance. The overall goal of the GBAR experiment is to measure the acceleration of the neutral antihydrogen (H) atom in the terrestrial gravitational field by neutralising a positive antihydrogen ion (H+), which has been cooled to a low temperature, and observing the subsequent H annihilation following free fall. To produce one H+ ion, about 10^10 positrons, efficiently converted into positronium (Ps), together with about 10^7 antiprotons (p), are required. The positrons, produced from an electron linac-based system, are accumulated first in the BGT whereafter they are stacked in the ultra-high vacuum HFT, where we have been able to trap 1.4(2) x 10^9 positrons in 1100 seconds.
Ein mittelalterlicher Eisenverhüttungsplatz bei Hemmingen, Lkr. Hannover
Creators: name: Zippel, Dietrich
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: -
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 44 (1975): Nachrichten aus Niedersachsens Urgeschichte
Ergänzungen zu den Abhandlungen von K. H. Brandt und K. Tackenberg über die nackengebogenen Äxte Nordwestdeutschlands
Creators: name: Tackenberg, Kurt
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: -
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 45 (1976): Nachrichten aus Niedersachsens Urgeschichte
Fast control of the reflection of a ferroelectric by an extremely short pulse
Creators: name: Caputo, J. -G.
name: Maimistov, A. I.
name: Kazantseva, E. V.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We propose a new type of optical switch based on a ferroelectric. It is based on the gap which exists for waves propagating from a dielectric to a ferroelectric material. This gap depends on the polarization of the ferroelectric. We show that it can be shifted by a control electromagnetic pulse so that the material becomes transparent. This device would shift much faster than the relaxation time of the ferroelectric (1 nano s). Estimates are given for a real material.
Ein Vorkommen der Hamburger Kultur bei Beckedorf, Gemeinde Hermannsburg, Kr. Celle
Creators: name: Siekmann, Wilhelm
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: -
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 45 (1976): Nachrichten aus Niedersachsens Urgeschichte
Twisting the near-field radiative heat switch in hyperbolic antiferromagnets
Creators: name: Du, Yuanyang
name: Peng, Jiebin
name: Shi, Zhong
name: Ren, Jie
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the twisted control of the near-field radiative heat transfer between two hyperbolic antiferromagnetic insulators under external magnetic fields. We show that the near-field heat flux can be affected by both the twist angle $θ$ and the magnitude of the applied magnetic field with different broken symmetries. Irrespective of twist angle, the external magnetic field causes the radiative heat flux to change nonmonotonically, and the minimum heat flux can be found with the magnetic fields of about 1.5 T. Such nonmonotonic behavior is due to the fact that the magnetic field can radically change the nature of the magnon polaritons with time reversal symmetry breaking. The field not only affects the topological structure of surface magnon polaritons, but also induces the volume magnon polaritons that progressively dominate the heat transfer as the field increases. We further propose a twist-induced thermal switch device with inversion symmetry breaking, which can severely regulate radiative heat flux through different magnetic fields. Our findings account for a characteristic modulation of radiative heat transfer with implications for applications in dynamic thermal management.
Human Emotion Classification based on EEG Signals Using Recurrent Neural Network And KNN
Creators: name: Joshi, Shashank
name: Joshi, Falak
Publisher: name: arXiv
Year: 2022
Subjects: subject: Signal Processing (eess.SP)
subject: Artificial Intelligence (cs.AI)
subject: Human-Computer Interaction (cs.HC)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: In human contact, emotion is very crucial. Attributes like words, voice intonation, facial expressions, and kinesics can all be used to portray one's feelings. However, brain-computer interface (BCI) devices have not yet reached the level required for emotion interpretation. With the rapid development of machine learning algorithms, dry electrode techniques, and different real-world applications of the brain-computer interface for normal individuals, emotion categorization from EEG data has recently gotten a lot of attention. Electroencephalogram (EEG) signals are a critical resource for these systems. The primary benefit of employing EEG signals is that they reflect true emotion and are easily resolved by computer systems. In this work, EEG signals associated with good, neutral, and negative emotions were identified using channel selection preprocessing. However, researchers had a limited grasp of the specifics of the link between various emotional states until now. To identify EEG signals, we used discrete wavelet transform and machine learning techniques such as recurrent neural network (RNN) and k-nearest neighbor (kNN) algorithm. Initially, the classifier methods were utilized for channel selection. As a result, final feature vectors were created by integrating the features of EEG segments from these channels. Using the RNN and kNN algorithms, the final feature vectors with connected positive, neutral, and negative emotions were categorized independently. The classification performance of both techniques is computed and compared. Using RNN and kNN, the average overall accuracies were 94.844 % and 93.438 %, respectively.
Geologisch-petrographische Untersuchungen im Bereich der frühbandkeramischen Siedlung bei Eitzum, Kr. Wolfenbüttel
Creators: name: Schneider, Werner
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: -
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 45 (1976): Nachrichten aus Niedersachsens Urgeschichte
IGRJ18179-1621: An obscured X-ray pulsar discovered by INTEGRAL
Creators: name: Bozzo, E.
name: Ferrigno, C.
name: Tuerler, M.
name: Manousakis, A.
name: Falanga, M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report on all the INTEGRAL and Swift data collected during the first outburst observed from IGRJ18179-1621. The broad-band spectral analysis showed that the X-ray emission from the source is heavily absorbed (N_H~10^23 cm^-2), and well described by a flat power-law with a high energy rollover (cutoff energy 9-12 keV, e-folding energy 4-7 keV). We found some evidence of a cyclotron absorption feature at 22\pm1 keV. Together with the pulsations at 11.8s discovered in the XRT data, this evidence would suggest that IGRJ18179-1621 is an obscured magnetized accreting neutron star, possibly part of a supergiant high mass X-ray binary or a Be X-ray binary system.
description: Accepted for publication on A&A V2. Corrected few typos
Ein Langhügel bei Ovelgönne, Stadt Buxtehude, Kr. Stade
Creators: name: Tromnau, Gernot
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: -
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 45 (1976): Nachrichten aus Niedersachsens Urgeschichte
Strokovna podpora Fakultete za matematiko in fiziko Univerze v Ljubljani prijavam na razpise Evropskega raziskovalnega sveta (ERC)
Creators: name: Dorić, Barbara
Publisher: name: Zenodo
Year: 2023

description: Predstavitev v okviru Srečanja projektnih konzorcijev izbranih na Javnem razpisu »Aktivnosti krepitve projektnih pisarn JRO« v okviru NOO z izmenjavo dobrih praks, ki ga je 13. 06. 2023 organizirala Univerza v Ljubljani.
Binary Dynamics from Worldline QFT for Scalar-QED
Creators: name: Wang, Tianheng
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 investigate the worldline quantum field theory (WQFT) formalism for scalar-QED and observe that a generating function emerges from WQFT, from which the scattering angle ensues. This generating function bears important similarities with the radial action in that it requires no consideration of exponentiation of lower-order contributions. We demonstrate the computations of this generating function and the resulting scattering angle of a binary system coupled to electromagnetic field up to the third order in the Post-Minkowskian expansion (3PM).expansion (3PM).
description: 4 pages + appendices, typos fixed, references added
Entanglement Phase Transition Induced by the Non-Hermitian Skin Effect
Creators: name: Kawabata, Kohei
name: Numasawa, Tokiro
name: Ryu, Shinsei
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Recent years have seen remarkable development in open quantum systems effectively described by non-Hermitian Hamiltonians. A unique feature of non-Hermitian topological systems is the skin effect, anomalous localization of an extensive number of eigenstates driven by nonreciprocal dissipation. Despite its significance for non-Hermitian topological phases, the relevance of the skin effect to quantum entanglement and critical phenomena has remained unclear. Here, we find that the skin effect induces a nonequilibrium quantum phase transition in the entanglement dynamics. We show that the skin effect gives rise to a macroscopic flow of particles and suppresses the entanglement propagation and thermalization, leading to the area law of the entanglement entropy in the nonequilibrium steady state. Moreover, we reveal an entanglement phase transition induced by the competition between the unitary dynamics and the skin effect even without disorder or interactions. This entanglement phase transition accompanies nonequilibrium quantum criticality characterized by a nonunitary conformal field theory whose effective central charge is extremely sensitive to the boundary conditions. We also demonstrate that it originates from an exceptional point of the non-Hermitian Hamiltonian and the concomitant scale invariance of the skin modes localized according to the power law. Furthermore, we show that the skin effect leads to the purification and the reduction of von Neumann entropy even in Markovian open quantum systems described by the Lindblad master equation. Our work opens a way to control the entanglement growth and establishes a fundamental understanding of phase transitions and critical phenomena in open quantum systems far from thermal equilibrium.
description: 24 pages, 16 figures
Extending the Belavin-Knizhnik "wonderful formula" by the characterization of the Jacobian
Creators: name: Matone, Marco
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Algebraic Geometry (math.AG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: A long-standing question in string theory is to find the explicit expression of the bosonic measure, a crucial issue also in determining the superstring measure. Such a measure was known up to genus three. Belavin and Knizhnik conjectured an expression for genus four which has been proved in the framework of the recently introduced vector-valued Teichmueller modular forms. It turns out that for g>3 the bosonic measure is expressed in terms of such forms. In particular, the genus four Belavin-Knizhnik "wonderful formula" has a remarkable extension to arbitrary genus whose structure is deeply related to the characterization of the Jacobian locus. Furthermore, it turns out that the bosonic string measure has an elegant geometrical interpretation as generating the quadrics in P^{g-1} characterizing the Riemann surface. All this leads to identify forms on the Siegel upper half-space that, if certain conditions related to the characterization of the Jacobian are satisfied, express the bosonic measure as a multiresidue in the Siegel upper half-space. We also suggest that it may exist a super analog on the super Siegel half-space.
description: 15 pages. Typos corrected, refs. and comments added
Ein Bronzerasiermesser mit Schiffsdarstellung aus Heeßel, Gemeinde Hemmoor, Kr. Land Hadeln
Creators: name: Brüning, Rolf G.
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: -
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 45 (1976): Nachrichten aus Niedersachsens Urgeschichte
Collisions of anisotropic two-dimensional bright solitons in dipolar Bose-Einstein condensates
Creators: name: Eichler, Rüdiger
name: Zajec, Damir
name: Köberle, Patrick
name: Main, Jörg
name: Wunner, Günter
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the coherent collision of anisotropic quasi-two-dimensional bright solitons in dipolar Bose-Einstein condensates. Our analysis is based on the extended Gross-Pitaevskii equation, and we use the split-operator method for the grid calculations and the time-dependent variational principle with an ansatz of coupled Gaussian functions to calculate the time evolution of the ground state. We compare the results of both approaches for collisions where initially the solitons are in the repelling side-by-side configuration and move towards each other with a specific momentum. We change the relative phases of the condensates, and introduce a total angular momentum by shifting the solitons in opposite direction along the polarization axis. Our calculations show that collisions result in breathing-mode-like excitations of the solitons.
description: 8 pages, 4 figures
Archäologische Untersuchungen in der Stadtkirche zu Walsrode
Creators: name: Marschalleck, Karl-Heinz
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: -
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 45 (1976): Nachrichten aus Niedersachsens Urgeschichte
Criteria for Bayesian model choice with application to variable selection
Creators: name: Bayarri, M. J.
name: Berger, J. O.
name: Forte, A.
name: García-Donato, G.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: In objective Bayesian model selection, no single criterion has emerged as dominant in defining objective prior distributions. Indeed, many criteria have been separately proposed and utilized to propose differing prior choices. We first formalize the most general and compelling of the various criteria that have been suggested, together with a new criterion. We then illustrate the potential of these criteria in determining objective model selection priors by considering their application to the problem of variable selection in normal linear models. This results in a new model selection objective prior with a number of compelling properties.
description: Published in at http://dx.doi.org/10.1214/12-AOS1013 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
A simple derivation of moiré-scale continuous models for twisted bilayer graphene
Creators: name: Cancès, Eric
name: Garrigue, Louis
name: Gontier, David
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We provide a formal derivation of a reduced model for twisted bilayer graphene (TBG) from Density Functional Theory. Our derivation is based on a variational approximation of the TBG Kohn-Sham Hamiltonian and asymptotic limit techniques. In contrast with other approaches, it does not require the introduction of an intermediate tight-binding model. The so-obtained model is similar to that of the Bistritzer-MacDonald (BM) model but contains additional terms. Its parameters can be easily computed from Kohn-Sham calculations on single-layer graphene and untwisted bilayer graphene with different stackings. It allows one in particular to estimate the parameters $w_{\rm AA}$ and $w_{\rm AB}$ of the BM model from first-principles. The resulting numerical values, namely $w_{\rm AA}= w_{\rm AB} \simeq 126$ meV for the experimental interlayer mean distance are in good agreement with the empirical values $w_{\rm AA}= w_{\rm AB}=110$ meV obtained by fitting to experimental data. We also show that if the BM parameters are set to $w_{\rm AA}= w_{\rm AB} \simeq 126$ meV, the BM model is an accurate approximation of our reduced model.
Adinkras and SUSY Holography
Creators: name: Gates, S. James
name: Hubsch, T.
name: Stiffler, Kory
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Representation Theory (math.RT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We discuss the mechanism by which adinkras holographically store the required information for the Spin(1,3) Clifford Algebra fiber bundle in the cases of three 4D, N=1 representations: the chiral, vector and tensor supermultiplets.
description: 13 pages, 4 figures, a few minor edits
Tailored max-out networks for learning convex PWQ functions
Creators: name: Teichrib, Dieter
name: Darup, Moritz Schulze
Publisher: name: arXiv
Year: 2022
Subjects: subject: Systems and Control (eess.SY)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences
subject: I.2.6

description: Convex piecewise quadratic (PWQ) functions frequently appear in control and elsewhere. For instance, it is well-known that the optimal value function (OVF) as well as Q-functions for linear MPC are convex PWQ functions. Now, in learning-based control, these functions are often represented with the help of artificial neural networks (NN). In this context, a recurring question is how to choose the topology of the NN in terms of depth, width, and activations in order to enable efficient learning. An elegant answer to that question could be a topology that, in principle, allows to exactly describe the function to be learned. Such solutions are already available for related problems. In fact, suitable topologies are known for piecewise affine (PWA) functions that can, for example, reflect the optimal control law in linear MPC. Following this direction, we show in this paper that convex PWQ functions can be exactly described by max-out-NN with only one hidden layer and two neurons.
description: 7 pages, 7 figures
An all-fiber source of pulsed twin beams at telecom band for quantum communication
Creators: name: Guo, Xueshi
name: Li, Xiaoying
name: Liu, Nannan
name: Yang, Lei
name: Ou, Z. Y.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Motivated by the pursuit of a simple system to produce non-classical light sources for long- distance quantum communication, we generate for the first time an all-fiber source of pulsed twin beams in 1550 nm band by using a high gain fiber optical parametric amplifier. The noise of intensity difference of the twin beams is below the shot noise limit by 3.1 dB (10.4 dB after correction for losses). A detailed study reveals a number of limiting factors for higher noise reduction. Therefore, further noise reduction will be feasible once care is taken for these limiting factors.
description: 5 pages, 6 figures
Recent progress on Majorana in semiconductor-superconductor heterostructures--Engineering and detection
Creators: name: Cao, Zhan
name: Chen, Shumeng
name: Zhang, Gu
name: Liu, Dong E.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Majorana zero modes (MZMs) are exotic excitations (in condensed matter systems) that have potential applications in topological quantum computation. Though MZMs have been predicted on many platforms, their existence of them is still under debate. In this paper, we review the recent progress of engineering and detecting MZMs in semiconductor-superconductor heterostructures. We also briefly review the protocols of implementing topological quantum computation by hybrid semiconductor-superconductor nanowires.
description: Invited review in Science China Physics Mechanics & Astronomy, with 7 figures, 15 pages
An algebraic approach to project schedule development under precedence constraints
Creators: name: Krivulin, Nikolai
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optimization and Control (math.OC)
subject: Systems and Control (eess.SY)
subject: FOS: Mathematics
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: 68M20 (Primary) 15A80, 90B35 (Secondary)

description: An approach to schedule development in project management is developed within the framework of idempotent algebra. The approach offers a way to represent precedence relationships among activities in projects as linear vector equations in terms of an idempotent semiring. As a result, many issues in project scheduling reduce to solving computational problems in the idempotent algebra setting, including linear equations and eigenvalue-eigenvector problems. The solutions to the problems are given in a compact vector form that provides the basis for the development of efficient computation procedures and related software applications.
description: 21 pages, 10 figures. ISSN: 2074-1278
On The Topological Nature of the Cosmological Constant
Creators: name: Maia, M. D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: It is shown that topological changes in space-time are necessary to make General Relativity compatible with the Newtonian limit and to solve the hierarchy of the fundamental interactions. We detail how topology and topological changes appear in General Relativity and how it leaves an observable footprint in space-time. In cosmology we show that such topological observable is the cosmic radiation produced by the acceleration of the universe. The cosmological constant is a very particular case which occurs when the expansion of the universe into the vacuum occurs only in the direction of the cosmic time flow.
description: 5 pages Latex no figures
Regular black holes with improved energy conditions and their analogues in fluids
Creators: name: Lan, Chen
name: Miao, Yan-Gang
name: Zang, Yi-Xiong
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: On the premise of the importance of energy conditions for regular black holes, we propose a method to remedy those models that break the dominant energy condition, e.g., the Bardeen and Hayward black holes. We modify the metrics but ensure their regularity at the same time, so that the weak, null, and dominant energy conditions are satisfied, with the exception of the strong energy condition. Likewise, we prove a no-go theorem for conformally related regular black holes, which states that the four energy conditions can never be met in this class of black holes. In order to seek evidences for distinguishing regular black holes from singular black holes, we resort to analogue gravity and regard it as a tool to mimic realistic regular black holes in a fluid. The equations of state for the fluid are solved via an asymptotic analysis associated with a numerical method, which provides a modus operandi for experimental observations, in particular, the conditions under which one can simulate realistic regular black holes in the fluid.
description: 38 pages, 30 figures, published version in Chinese Physics C
Erinnerungen an Max Martin (19. November 1939 – 30. Dezember 2016)
Creators: name: Meier, Thomas
Publisher: name: Bericht der Römisch-Germanischen Kommission
Year: 2019

description: -
description: Bericht der Römisch-Germanischen Kommission, Bd. 96. 2015 (2019): Bericht der Römisch-Germanischen Kommission
Neural Networks for Complex Data
Creators: name: Cottrell, Marie
name: Olteanu, Madalina
name: Rossi, Fabrice
name: Rynkiewicz, Joseph
name: Villa-Vialaneix, Nathalie
Publisher: name: arXiv
Year: 2012
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Artificial neural networks are simple and efficient machine learning tools. Defined originally in the traditional setting of simple vector data, neural network models have evolved to address more and more difficulties of complex real world problems, ranging from time evolving data to sophisticated data structures such as graphs and functions. This paper summarizes advances on those themes from the last decade, with a focus on results obtained by members of the SAMM team of Université Paris 1