cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Evolution of Multiphase Hot Interstellar Medium in Elliptical Galaxies
Creators: name: Fujita, Yutaka
name: Fukumoto, Junji
name: Okoshi, Katsuya
Publisher: name: arXiv
Year: 1997
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of a variety of simulations concerning the evolution of multiphase (inhomogeneous) hot interstellar medium (ISM) in elliptical galaxies. We assume the gases ejected from stars do not mix globally with the circumferential gas. The ejected gas components evolve separately according to their birth time, position, and origin. We consider cases where supernova remnants (SNRs) mix with local ISM. The components with high metal abundance and/or high density cool and drop out of the hot ISM gas faster than the other components because of their high metal abundance and/or density. This makes the average metal abundance of the hot ISM low. Furthermore, since the metal abundance of mass-loss gas decreases with radius, gas inflow from outer region makes the average metal abundance of the hot ISM smaller than that of mass-loss gas in the inner region. As gas ejection rate of stellar system decreases, mass fraction of mass-loss gas ejected at outer region increases in a galaxy. If the mixing of SNRs is ineffective, our model predicts that observed [Si/Fe] and [Mg/Fe] should decrease towards the galactic center because of strong iron emission by SNRs. In the outer region, where the cooling of time of the ISM is long, the selective cooling is ineffective and most of gas components remain hot. Thus, the metal abundance of the ISM in this region directly reflects that of the gas ejected from stars. Our model shows that supernovae are not effective heating sources in the inner region of elliptical galaxies, because most of the energy released by them radiates. Therefore, cooling flow is established even if the supernova rate is high. Mixing of SNRs with ambient ISM makes the energy transfer between supernova explosion and ambient ISM more effective.
description: 21 pages (AASTeX), 14 figures, accepted for publication in The Astrophysical Journal
Generation of tunable, high repetition rate optical frequency combs using on-chip silicon modulators
Creators: name: Nagarjun, Kp
name: Jeyaselvan, Vadivukarassi
name: Selvaraja, Shankar Kumar
name: Supradeepa, V R
Publisher: name: arXiv
Year: 2018
Subjects: subject: Applied Physics (physics.app-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We experimentally demonstrate tunable, highly-stable frequency combs with high repetition-rates using a single, charge injection based silicon PN modulator. In this work, we demonstrate combs in the C-band with over 8 lines in a 20-dB bandwidth. We demonstrate continuous tuning of the center frequency in the C-band and tuning of the repetition-rate from 7.5GHz to 12.5GHz. We also demonstrate through simulations the potential for bandwidth scaling using an optimized silicon PIN modulator. We find that, the time varying free carrier absorption due to carrier injection, an undesirable effect in data modulators, assists here in enhancing flatness in the generated combs.
description: 10 pages, 7 figures
title: Towards a caring practice in the community: exploring the healthcare needs of young people leaving custody
Creators: name: Biazus Dalcin, Camila
Publisher: name: University of Dundee
publisherIdentifier: https://ror.org/03h2bxq36
publisherIdentifierScheme: ROR
Year: 2022

description: This study explores the views and experiences related to healthcare of young people leaving custody and factors that influence the interaction between them and practitioners. The impacts of the interaction on young people’s health and wellbeing were considered. Through the development of an ethnographical study in Scotland, I engaged in participatory observation between July 2019 and March 2020 in 22 different services to analyse the interaction between young people leaving custody and practitioners that support healthcare in the community. I conducted 18 face-to-face in-depth interviews examining the experiences of young people and practitioners. Participants were eight young people and ten practitioners, and the interviews took place between October 2019 and March 2020. To understand the dynamics of interactions in the healthcare field, the study considered Ethics of Care in articulation with Pierre Bourdieu’s theoretical framework, specifically the concept of symbolic violence.

Findings reveal that young people experience stigma and symbolic violence when interacting with practitioners in the healthcare field. The experience of imprisonment at a young age reinforced the lack of recognition of the young person’s capital. This thesis offers a fresh model of a caring interaction practice to address issues of power dynamics in the healthcare field. The model responds to young people’s needs and expectations, in which the implementation takes into consideration Bourdieu’s concepts and the Ethics of Care. A change of narrative about the young person leaving custody is essential for consolidating the micro-level, mezzo-level and macro-level of a caring interaction practice.
A bootstrap test for equality of variances
Creators: name: Cahoy, Dexter
Publisher: name: arXiv
Year: 2018
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: We introduce a bootstrap procedure to test the hypothesis $H_o$ that $K+1$ variances are homogeneous. The procedure uses a variance-based statistic, and is derived from a normal-theory test for equality of variances. The test equivalently expressed the hypothesis as $H_o: \mathbfη=( η_1,\ldots,η_{K+1})^T=\mathbf{0}$, where $η_i$'s are log contrasts of the population variances. A box-type acceptance region is constructed to test the hypothesis $H_o$. Simulation results indicated that our method is generally superior to the Shoemaker and Levene tests, and the bootstrapped version of Levene test in controlling the Type I and Type II errors.
Tailoring Solution Accuracy for Fast Whole-body Model Predictive Control of Legged Robots
Creators: name: Khazoom, Charles
name: Hong, Seungwoo
name: Chignoli, Matthew
name: Stanger-Jones, Elijah
name: Kim, Sangbae
Publisher: name: arXiv
Year: 2024
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Thanks to recent advancements in accelerating non-linear model predictive control (NMPC), it is now feasible to deploy whole-body NMPC at real-time rates for humanoid robots. However, enforcing inequality constraints in real time for such high-dimensional systems remains challenging due to the need for additional iterations. This paper presents an implementation of whole-body NMPC for legged robots that provides low-accuracy solutions to NMPC with general equality and inequality constraints. Instead of aiming for highly accurate optimal solutions, we leverage the alternating direction method of multipliers to rapidly provide low-accuracy solutions to quadratic programming subproblems. Our extensive simulation results indicate that real robots often cannot benefit from highly accurate solutions due to dynamics discretization errors, inertial modeling errors and delays. We incorporate control barrier functions (CBFs) at the initial timestep of the NMPC for the self-collision constraints, resulting in up to a 26-fold reduction in the number of self-collisions without adding computational burden. The controller is reliably deployed on hardware at 90 Hz for a problem involving 32 timesteps, 2004 variables, and 3768 constraints. The NMPC delivers sufficiently accurate solutions, enabling the MIT Humanoid to plan complex crossed-leg and arm motions that enhance stability when walking and recovering from significant disturbances.
description: This work is published in IEEE Robotics and Automation Letters
Classical versus quantum probability: Comments on the paper "On universality of classical probability with contextually labeled random variables" by E. Dzhafarov and M. Kon
Creators: name: Khrennikov, Andrei
Publisher: name: arXiv
Year: 2018
Subjects: subject: Probability (math.PR)
subject: Neurons and Cognition (q-bio.NC)
subject: Quantum Physics (quant-ph)
subject: FOS: Mathematics
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Recently Dzhafarov and Kon published the paper advertising the possibility to use the coupling technique of classical probability theory to model incompatible observables in quantum physics and quantum-like models of psychology. Here I present comments on this paper by stressing advantages and disadvantages.
The EU-Japan business relations and forms of representation of Japanese corporation interest in the EU
Creators: name: Michał Piechowicz
Publisher: name: figshare
Year: 2018
Subjects: subject: 150308 International Business
subject: FOS: Economics and business

description: Economy and growth from the Asian states’ perspective, 2014This article relates to economic relations between the EU and Japan. It includes a brief history of relationships, the importance of both entities in mutual trade and the impact of the economic crisis on direct investments. In this aspect it is important to reveal the essence of effective way of representing interests of Japanese corporations in the EU as a third country which has no representatives in the EU institutions involved in decision-making process. Thus, an important aspect is to identify organizations and associations whose goal is to promote Japanese interests on the Brussels forum. This aspect is analyzed as a comparison which also includes differences in the perception of lobbying at European/supranational level and Japanese national lobbying style.
Ferromagnet/Semiconductor/Ferromagnet Hybrid Trilayers grown using solid phase epitaxy
Creators: name: Gaucher, Samuel
name: Jenichen, Bernd
name: Herfort, Jens
Publisher: name: arXiv
Year: 2018
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The direct growth of semiconductors over metals by molecular beam epitaxy is a difficult task due to the large differences in crystallization energy between these types of materials. This aspect is problematic in the context of spintronics, where coherent spin-injection must proceed via ballistic transport through sharp interfacial Schottky barriers. We report the realization of single-crystalline ferromagnet/semiconductor/ferromagnet hybrid trilayers using solid-phase epitaxy, with combinations of Fe3Si, Co2FeSi, and Ge. The slow annealing of amorphous Ge over Fe3Si results in a crystalline filmlm identified as FeGe2. When the annealing is performed over Co2FeSi, reflected high-energy electron diffraction and X-ray diffraction indicate the creation of a different crystalline Ge(Co,Fe,Si) compound, which also preserves growth orientation. It was possible to observe independent magnetization switching of the ferromagnetic layers in a Fe3Si/FeGe2/Co2FeSi sample, thanks to the different coercive fields of the two metals and to the quality of the interfaces. This result is a step towards the implementation of vertical spin-selective transistor-like devices.
description: 4 pages
Lattice QCD calculation of the invisible decay $J/ψ\rightarrow γν\barν$
Creators: name: Meng, Yu
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this work, we present the first lattice QCD study on the invisible decay $J/ψ\rightarrow γν\barν$. The calculation is accomplished using $N_f=2$ twisted mass fermion ensembles. The excited-state effects are observed and eliminated using a multi-state fit. The impact of finite-volume effects is also examined and confirmed to be well-controlled. After a continuous extrapolation under three lattice spacings, we obtain the branching fraction as $\operatorname{Br}[J/ψ\rightarrow γν\barν]=1.00(9)(7)\times 10^{-10}$, where the first error is the statistical error and the second is an estimate of the systematics. The exact theoretical prediction can be used to remove the only invisible contamination from the standard model background in searching for the possible dark matter by the channel $J/ψ\rightarrow γ+\textrm{invisible}$
description: 14 pages, 6 figures. Proceedings of the 40th International Symposium on Lattice Field Theory (Lattice 2023), Fermilab
Antisymmetric tensor field on $AdS_5$
Creators: name: Arutyunov, G. E.
name: Frolov, S. A.
Publisher: name: arXiv
Year: 1998
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: By using the Hamiltonian version of the AdS/CFT correspondence, we compute the two-point Green function of a local operator in D=4 N=4 super Yang-Mills theory, which corresponds to a massive antisymmetric tensor field of the second rank on the $AdS_{5}$ background. We discuss the conformal transformations induced on the boundary by isometries of $AdS_{5}$.
description: latex, 6 pages, misprints are corrected, to be published in Phys.Lett.B
Font's Room
Creators: name: A. H. Schroeder
Year: 1966
Subjects: subject: Classic Period
valueUri: https://core.tdar.org/browse/temporal-keyword/125/classic-period
subject: Hohokam
valueUri: https://core.tdar.org/browse/culture-keyword/21/hohokam
subject: Casa Grande Ruins National Monument
valueUri: https://core.tdar.org/browse/site-name/1435/casa-grande-ruins-national-monument
subject: Ancient Structure
valueUri: https://core.tdar.org/browse/site-type/335/ancient-structure
subject: Trash Midden
valueUri: https://core.tdar.org/browse/site-type/351/trash-midden
subject: Domestic Structures
valueUri: https://core.tdar.org/browse/site-type/256/domestic-structures
subject: Historic Structure
valueUri: https://core.tdar.org/browse/site-type/336/historic-structure
subject: Agricultural or Herding
valueUri: https://core.tdar.org/browse/site-type/273/agricultural-or-herding
subject: Ball Court
valueUri: https://core.tdar.org/browse/site-type/310/ball-court
subject: Plaza
valueUri: https://core.tdar.org/browse/site-type/331/plaza
subject: Settlements
valueUri: https://core.tdar.org/browse/site-type/252/settlements
subject: Ceramic
valueUri: https://core.tdar.org/browse/material-type/1/ceramic
subject: Environment Research
valueUri: https://core.tdar.org/browse/investigation-type/13/environment-research
subject: Historic Background Research
valueUri: https://core.tdar.org/browse/investigation-type/18/historic-background-research
subject: Site Stewardship Monitoring
valueUri: https://core.tdar.org/browse/investigation-type/19/site-stewardship-monitoring
subject: Records Search / Inventory Checking
valueUri: https://core.tdar.org/browse/investigation-type/8/records-search-inventory-checking

description: This document is a memorandum from Regional Archaeologist Albert Schroeder regarding Font's Room. It deals with why the room was named after him and the possibility that Font was confused with Father Kino, who actually gave mass at the ruins.
Diff-MTS: Temporal-Augmented Conditional Diffusion-based AIGC for Industrial Time Series Towards the Large Model Era
Creators: name: Ren, Lei
name: Wang, Haiteng
name: Laili, Yuanjun
Publisher: name: arXiv
Year: 2024
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Industrial Multivariate Time Series (MTS) is a critical view of the industrial field for people to understand the state of machines. However, due to data collection difficulty and privacy concerns, available data for building industrial intelligence and industrial large models is far from sufficient. Therefore, industrial time series data generation is of great importance. Existing research usually applies Generative Adversarial Networks (GANs) to generate MTS. However, GANs suffer from unstable training process due to the joint training of the generator and discriminator. This paper proposes a temporal-augmented conditional adaptive diffusion model, termed Diff-MTS, for MTS generation. It aims to better handle the complex temporal dependencies and dynamics of MTS data. Specifically, a conditional Adaptive Maximum-Mean Discrepancy (Ada-MMD) method has been proposed for the controlled generation of MTS, which does not require a classifier to control the generation. It improves the condition consistency of the diffusion model. Moreover, a Temporal Decomposition Reconstruction UNet (TDR-UNet) is established to capture complex temporal patterns and further improve the quality of the synthetic time series. Comprehensive experiments on the C-MAPSS and FEMTO datasets demonstrate that the proposed Diff-MTS performs substantially better in terms of diversity, fidelity, and utility compared with GAN-based methods. These results show that Diff-MTS facilitates the generation of industrial data, contributing to intelligent maintenance and the construction of industrial large models.
description: 11 pages,4 figures. This work has been submitted to the IEEE for possible publication
Rola Frontex w zarządzaniu przestrzenią wolności, bezpieczeństwa i sprawiedliwości UE
Creators: name: Michał Piechowicz
Publisher: name: figshare
Year: 2018
Subjects: subject: 160607 International Relations
subject: FOS: Political science

description: Przegląd Politologiczny, 2018Celem artykułu jest horyzontalna i funkcjonalna analiza umiejscowienia agencji Frontex w systemie instytucjonalnym UE oraz wskazanie jej znaczenia w tworzącym się ponadnarodowym systemie zabezpieczania granic. Artykuł jest próbą odpowiedzi na pytanie, czy Frontex jest nowym rodzajem instrumentu zarządzania przestrzenią wolności, bezpieczeństwa i sprawiedliwości UE? W pracy wykorzystano metody jakościowe, a za źródło informacji posłużyła analiza treści dokumentów i literatury przedmiotu. W artykule znajdują się informacje o roli i specyfice agencji ponadnarodowych, znaczeniu Frontex i usytuowania w strukturze instytucjonalnej UE, jak również o utworzonych instrumentach realizacji celów agencji tj. Eurosur i IBM. Dyskusji poddano także aspekt przenikania się sfery krajowej i ponadnarodowej w omawianym aspekcie PWBiS. Artykuł dowodzi, że pozytywnie należy zweryfikować założenie, że to tworzone na poziomie ponadnarodowym narzędzia służące realizacji celów Frontex sprzyjają procesowi uwspólnotowienia systemu zarządzania granicami zewnętrznymi UE. Wnioski wskazują także, że pomimo rozbudowywanych kompetencji wspierania zarządzania granicami na poziomie ponadnarodowym, nadal jest to kompetencja państw członkowskich, dla których nadzór granic lądowych i morskich jest sprawą priorytetową bezpieczeństwa.
Large fluctuations of a Kardar-Parisi-Zhang interface on a half-line
Creators: name: Meerson, Baruch
name: Vilenkin, Arkady
Publisher: name: arXiv
Year: 2018
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Consider a stochastic interface $h(x,t)$, described by the $1+1$ Kardar-Parisi-Zhang (KPZ) equation on the half-line $x\geq 0$. The interface is initially flat, $h(x,t=0)=0$, and driven by a Neumann boundary condition $\partial_x h(x=0,t)=A$ and by the noise. We study the short-time probability distribution $\mathcal{P}\left(H,A,t\right)$ of the one-point height $H=h(x=0,t)$. Using the optimal fluctuation method, we show that $-\ln \mathcal{P}\left(H,A,t\right)$ scales as $t^{-1/2} s \left(H,A t^{1/2}\right)$. For small and moderate $|A|$ this more general scaling reduces to the familiar simple scaling $-\ln \mathcal{P}\left(H,A,t\right)\simeq t^{-1/2} s(H)$, where $s$ is independent of $A$ and time and equal to one half of the corresponding large-deviation function for the full-line problem. For large $|A|$ we uncover two asymptotic regimes. At very short time the simple scaling is restored, whereas at intermediate times the scaling remains more general and $A$-dependent. The distribution tails, however, always exhibit the simple scaling in the leading order.
description: 9 pages, 10 figures
Dynamic fermion flavor mixing through transition dipole moments
Creators: name: Rafelski, Johann
name: Steinmetz, Andrew
name: Yang, Cheng Tao
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We show that Majorana neutrino flavor mixing can be driven by transition dipole moments in the presence of external electromagnetic fields. We demonstrate the sensitivity of the rotation mixing matrix to strong fields obtaining dynamical mass eigenstates in the two-flavor model. The three-flavor case and extensions to the quark sector are introduced.
description: 14 pages. A version of this article with extended personal remarks appears in the book dedicated to the memory of Harald Fritzsch edited by Gerhard Buchalla, Dieter L\"ust and Zhi-Zhong Xing
Form factors of pion and kaon
Creators: name: Gao, Jun
name: Li, Bing An
Publisher: name: arXiv
Year: 1999
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: An addtional intrinsic form factors of pion and kaons have been studied.
description: 14 pages and 10 figures
Microscopic optical potentials for calcium isotopes
Creators: name: Rotureau, J.
name: Danielewicz, P.
name: Hagen, G.
name: Jansen, G. R.
name: Nunes, F. M.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We construct nucleonic microscopic optical potentials by combining the Green's function approach with the coupled-cluster method for $\rm{^{40}Ca}$ and $\rm{^{48}Ca}$. For the computation of the ground-state of $\rm{^{40}Ca}$ and $\rm{^{48}Ca}$, we use the coupled-cluster method in the singles-and-doubles approximation, while for the A = $\pm 1$ nuclei we use particle-attached/removed equation-of-motion method truncated at two-particle-one-hole and one-particle-two-hole excitations, respectively. Our calculations are based on the chiral nucleon-nucleon and three-nucleon interaction $\rm{NNLO_{sat}}$, which reproduces the charge radii of $^{40}$Ca and $^{48}$Ca, and the chiral nucleon-nucleon interaction $\rm{NNLO_{opt}}$. In all cases considered here, we observe that the overall form of the neutron scattering cross section is reproduced for both interactions, but the imaginary part of the potential, which reflects the loss of flux in the elastic channel, is negligible. The latter points to neglected many-body correlations that would appear beyond the coupled-cluster truncation level considered in this work. We show that, by artificially increasing the parameter $η$ in the Green's function, practical results can be further improved.
description: 11 pages, 10 figures, typos corrected, accepted for publication in Phys. Rev. C
Constraints on the Mass and Mixing of the 4th Generation Quark From Direct CP Violation$ε^{\prime}/ε$ and Rare K Decays
Creators: name: Huang, Chao-Shang
name: Huo, Wu-Jun
name: Wu, Yue-Liang
Publisher: name: arXiv
Year: 2000
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the $ε^{\prime} /ε$ for $K\to ππ$ in a sequential fourth generation model. By giving the basic formulae for $ε^{\prime}/ε$ in this model, we analyze the numerical results which are dependent of $m_{t^{\prime}}$ and imaginary part of the fourth CKM factor, ${Im}V^{*}_{t^{'}s}V_{t^{'}d}$ (or $V^{*}_{t^{'}s}V_{t^{'}d}$ and the fourth generation CKM matrix phase $θ$). We find that, unlike the SM, when taking the central values of all parameters for $ε^{\prime}/ε$, the values of $ε^{\prime}/ ε$ can easily fit to the current experimental data for all values of hadronic matrix elements estimated from various approaches. Also, we show that the experimental values of $ε^{\prime}/ε$ and rare K decays can provide a strong constraint on both mass and mixing of the fourth generation quark. When taking the values of hadronic matrix elements from the lattice or 1/N expansion calculations, a large region of the up-type quark mass $m_{t^{\prime}}$ is excluded.
description: 18 pages, 4 eps figures
I've Got 99 Problems But FLOPS Ain't One
Creators: name: Gherghescu, Alexandru M.
name: Bădoiu, Vlad-Andrei
name: Agache, Alexandru
name: Dumitru, Mihai-Valentin
name: Vasilescu, Iuliu
name: Mantu, Radu
name: Raiciu, Costin
Publisher: name: arXiv
Year: 2024
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Computation and Language (cs.CL)
subject: Machine Learning (cs.LG)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Hyperscalers dominate the landscape of large network deployments, yet they rarely share data or insights about the challenges they face. In light of this supremacy, what problems can we find to solve in this space? We take an unconventional approach to find relevant research directions, starting from public plans to build a $100 billion datacenter for machine learning applications. Leveraging the language models scaling laws, we discover what workloads such a datacenter might carry and explore the challenges one may encounter in doing so, with a focus on networking research. We conclude that building the datacenter and training such models is technically possible, but this requires novel wide-area transports for inter-DC communication, a multipath transport and novel datacenter topologies for intra-datacenter communication, high speed scale-up networks and transports, outlining a rich research agenda for the networking community.
Chiral Effective Lagrangian Description of Bulk Nuclear Matter
Creators: name: Gelmini, Graciela
name: Ritzi, Bruce
Publisher: name: arXiv
Year: 1995
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Here we point out that the four-nucleon terms incorporate into lowest order non-linear chiral effective Lagrangians the same description of bulk nuclear matter contained in the Walecka model, that is generally considered satisfactory. We find this point worth noticing because, while the Walecka model is an entirely phenomenological renormalizable model, non-linear chiral Lagrangians have a deep basis in elementary particle physics, and, in this sense, are more fundamental.
description: 7 pages, Tex.
Cavity-assisted atomic Raman memories beyond the bad cavity limit: effect of four-wave mixing
Creators: name: Veselkova, N. G.
name: Masalaeva, N. I.
name: Sokolov, I. V.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum memories can be used not only for the storage of quantum information, but also for substantial manipulation of ensembles of quantum states. Therefore, the speed of such manipulation and the ability to write and retrieve the signals of relatively short duration becomes important. Previously there have been considered the limits on efficiency of the cavity-enhanced atomic Raman memories for the signals whose duration is not much larger than the cavity field lifetime, that is, beyond the bad cavity limit. We investigate in this work the four-wave mixing noise that arises by the retrieval of the relatively short signals from the cavity-assisted memories, thus complementing recent considerations by other authors, who mainly concentrated on the limit of large cavity decay rate. The four-wave mixing noise is commonly recognized as an important factor, able to prevent achieving a high memories quality in a variety of the atomic, solid state etc. implementations. The side-band noise sources (with respect to the quantized signal, supported by the cavity) play important role in the four-wave mixing. We propose an approach that allows one to account for the side-band quantum noise sources of different physical origin in the cavity-assisted atomic memories using a unified theoretical framework, based on a two-band spectral filtering of the noise sources. We demonstrate that in such spectrally-selective memories the side-band atomic noise sources essentially contribute to the four-wave mixing noise of the retrieved signal on a par with the side-band quantized field entering the cavity.
Potential biases and prospects for the Hubble constant estimation via electromagnetic and gravitational-wave joint analyses
Creators: name: Gianfagna, Giulia
name: Piro, Luigi
name: Pannarale, Francesco
name: Van Eerten, Hendrik
name: Ricci, Fulvio
name: Ryan, Geoffrey
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: GW170817 is a binary neutron star merger that exhibited a gravitational wave (GW) and a gamma-ray burst, followed by an afterglow. In this work, we estimate the Hubble constant ($H_0$) using broad-band afterglow emission and relativistic jet motion from the Very Long Baseline Interferometry and Hubble Space Telescope images of GW170817. Compared to previous attempts, we combine these messengers with GW in a simultaneous Bayesian fit. We probe the $H_0$ measurement robustness depending on the data set used, the assumed jet model, the possible presence of a late time flux excess. Using the sole GW leads to a $20\%$ error ($77^{+21}_{-10}$ km/s/Mpc, medians, 16th-84th percentiles), because of the degeneracy between viewing angle ($θ_v$) and luminosity distance ($d_L$). The latter is reduced by the inclusion in the fit of the afterglow light curve, leading to $H_0=96^{+13}_{-10}$ km/s/Mpc, a large value, caused by the fit preference for high viewing angles due to the possible presence of a late-time excess in the afterglow flux. Accounting for the latter by including a constant flux component at late times brings $H_0=78.5^{+7.9}_{-6.4}$ km/s/Mpc. Adding the centroid motion in the analysis efficiently breaks the $d_L-θ_v$ degeneracy and overcome the late-time deviations, giving $H_0 = 69.0^{+4.4}_{-4.3}$ km/s/Mpc (in agreement with Planck and SH0ES measurements) and $θ_v = 18.2^{+1.2}_{-1.5}$ deg. This is valid regardless of the jet structure assumption. Our simulations show that for next GW runs radio observations are expected to provide at most few other similar events.
description: 14 pages, 10 figures. Accepted for publication in MNRAS
Tra deprivazione e homelessness: la povertà delle donne nell’Italia di oggi
Creators: name: Freguja, Cristina
name: Masi, Alessandra
name: Pannuzi, Nicoletta
name: Sabbadini, Linda Laura
Publisher: name: Storia delle Donne
Year: 2018

description: The lack of adequate resources for many women and their households can leads to significant economic difficulties, often resulting in an inability to acquire essential goods and services. The purpose of the paper is to analyse the female condition of poverty distinguishing by different characteristics and degrees of distress, also taking into account the role of women in the household. The measures of deprivation, absolute poverty and extreme poverty allow to draw a picture of the economically vulnerable population and its composition in different groups. Identifying different groups means also identifying policy targets and tailoring interventions to different paths of exclusion, that can be more or less dependent on labour market participation, income sources, health conditions or social networks reliability.
description: Storia delle Donne, Vol 13 No 1 (2017): Storia delle Donne 13/2017 - Povertà
A Spatially Resolved Study of X-ray Properties in Superbubble 30 Dor C with $XMM-Newton$
Creators: name: Babazaki, Yasunori
name: Mitsuishi, Ikuyuki
name: Matsumoto, Hironori
name: Sano, Hidetoshi
name: Yamane, Yumiko
name: Yoshiike, Satoshi
name: Fukui, Yasuo
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We carry out spatially resolved spectral analysis with a physical scale of $\sim$10 pc in X-ray for the superbubble 30 Dor C, which has the largest diameter of $\sim$80 pc and the brightest non-thermal emission in superbubbles for the first time. We aim at investigating spatial variation of the physical properties of non-thermal emission as detected in some supernova remnants in order to study particle acceleration in a superbubble. We demonstrated that non-thermal components are detected in all the regions covering the entire field of 30 Dor C. The spectra in the west region of 30 Dor C can be described with a combination of the thermal and non-thermal components while the spectra in the east region can be fitted with the non-thermal component alone. The photon index and absorption corrected intensity in 2-10 keV of the non-thermal component show spatial variation from $\sim$2.0 to $\sim$3.7 and (4-130) $\times$ 10$^{-8}$ erg~s$^{-1}$~cm$^{-2}$~str$^{-1}$, respectively, and the negative correlation between the non-thermal physical properties is observed. The temperature and normalization of the thermal component also vary within a range of $\sim$0.2-0.3 keV and $\sim$0.2-7 $\times$ 10$^{17}$ cm$^{-5}$ str$^{-1}$, respectively, and the positive correlation between the photon index and the normalization is also detected. We revealed the correlations in a supperbubble for the first time as is the case in SNRs, which suggests the possibility that the same acceleration mechanism works also in the supperbubble.
description: 11 pages, 6 figures, accepted for publication in ApJ
La povertà delle donne nell’Unione Europea
Creators: name: Rossilli, Mariagrazia
Publisher: name: Storia delle Donne
Year: 2018

description: In the Europe 2020 strategy the EU decided to reduce by 20 million the number of people at risk of poverty or social exclusion. Economic crisis and austerity policies have made it very difficult to reach this objective since the number of poor people has increased. Even though the gender gap in poverty was lowered in all member countries given the increase in male poverty, the number of women at risk of poverty and social exclusion is higher than that of men in 2015.While there are big differences among member States, EU policies hampered the reduction of poverty in most of them. Therefore it is necessary to change EU social and macroeconomic policies.
description: Storia delle Donne, Vol 13 No 1 (2017): Storia delle Donne 13/2017 - Povertà
Gauge mediated supersymmetry breaking and supergravity
Creators: name: de Alwis, S. P.
name: Irges, N.
Publisher: name: arXiv
Year: 1999
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We analyze simple models of gauge mediated supersymmetry breaking in the context of supergravity. We distinguish two cases. One is when the messenger of the supersymmetry breaking is a non Abelian gauge force and the other is when the messenger is a pseudoanomalous U(1). We assume that these models originate from string theory and we impose the constraint of the vanishing of the cosmological constant requiring also the stabilization of the dilaton. In the first case, we do not find vacua that are consistent with the constraints of gauge mediation and have a zero tree level cosmological constant. In the second case, no such conflict arises. In addition, by looking at the one loop cosmological constant, we show that the dilaton F-term can not be neglected in either case. For the gauge mediated case our considerations suggest that the dilaton must be frozen out of the low energy field theory by non-perturbative string dynamics.
description: Revised version. Significant changes in Introduction and Conclusion, 9 pages
Spikes and spines in 4D Lorentzian simplicial quantum gravity
Creators: name: Borissova, Johanna
name: Dittrich, Bianca
name: Qu, Dongxue
name: Schiffer, Marc
Publisher: name: arXiv
Year: 2024
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Simplicial approaches to quantum gravity such as quantum Regge calculus and spin foams include configurations where bulk edges can become arbitrarily large while the boundary edges are kept small. Spikes and spines are prime examples for such configurations. They pose a significant challenge for a desired continuum limit, for which the average lengths of edges ought to become very small. Here we investigate spike and spine configurations in four-dimensional Lorentzian quantum Regge calculus. We find that the expectation values of arbitrary powers of the bulk length are finite. To that end, we explore new types of asymptotic regimes for the Regge amplitudes, in which some of the edges are much larger than the remaining ones. The amplitudes simplify considerably in such asymptotic regimes and the geometric interpretation of the resulting expressions involves a dimensional reduction, which might have applications to holography.
description: v1: 32 pages, 13 figures, v2: minor modifications, published version
Singularity free dilaton-driven cosmologies and pre-little-bang
Creators: name: Giovannini, Massimo
Publisher: name: arXiv
Year: 1998
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: There are no reasons why the singularity in the growth of the dilaton coupling should not be regularised, in a string cosmological context, by the presence of classical inhomogeneities. We discuss a class of inhomogeneous dilaton-driven models whose curvature invariants are all bounded and regular in time and space. We prove that the non-space-like geodesics of these models are all complete in the sense that none of them reaches infinity for a finite value of the affine parameter. We conclude that our examples represent truly singularity-free solutions of the low energy beta functions. We discuss some symmetries of the obtained solutions and we clarify their physical interpretation. We also give examples of solutions with spherical symmetry. In our scenario each physical quantity is everywhere defined in time and space, the big-bang singularity is replaced by a maximal curvature phase where the dilaton kinetic energy reaches its maximum. The maximal curvature is always smaller than one (in string units) and the coupling constant is also smaller than one and it grows between two regimes of constant dilaton, implying, together with the symmetries of the solutions, that higher genus and higher curvature corrections are negligible. We argue that our examples describe, in a string cosmological context, the occurrence of ``little bangs''(i.e. high curvature phases which never develop physical singularities). They also suggest the possibility of an unexplored ``pre-little-bang'' phase.
description: 25 pages in LaTex style, 3 encapsulated figures
Polityka energetyczna UE i jej wpływ na politykę zagraniczną Polski
Creators: name: Michał Piechowicz
Publisher: name: figshare
Year: 2018
Subjects: subject: 90607 Power and Energy Systems Engineering (excl. Renewable Power)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: 90608 Renewable Power and Energy Systems Engineering (excl. Solar Cells)

description: Studia Europejskie, 2015This article is based on documents and legal acts of the EU institutions which are es-sential for the functioning of the European Energy Programme for Recovery. It also provides the legal basis and assumptions of the EU common energy policy. Important aspect addressed in this paper is the efficiency and the level of integration of European gas market and ways to ensure a secure supply of raw materials, which are combined with investments in infrastruc-ture. In this context there is a significant need to set up works on the development of the in-ternal network and interconnections. This article also reveals the importance of the European Energy Programme for Recovery as a useful tool tailored to the objectives of the discussed legislations that allows progress in key European investment projects.
Polityka energetyczna UE w kontekście realizacji Europejskiego programu energetycznego na rzecz naprawy gospodarczej (EEPR)
Creators: name: Michał Piechowicz
Publisher: name: figshare
Year: 2018
Subjects: subject: 160607 International Relations
subject: FOS: Political science

description: Studia Europejskie, 2015This article is based on documents and legal acts of the EU institutions which are es-sential for the functioning of the European Energy Programme for Recovery. It also provides the legal basis and assumptions of the EU common energy policy. Important aspect addressed in this paper is the efficiency and the level of integration of European gas market and ways to ensure a secure supply of raw materials, which are combined with investments in infrastruc-ture. In this context there is a significant need to set up works on the development of the in-ternal network and interconnections. This article also reveals the importance of the European Energy Programme for Recovery as a useful tool tailored to the objectives of the discussed legislations that allows progress in key European investment projects.
The Maximum Optical Depth Towards Bulge Stars From Axisymmetric Models of the Milky Way
Creators: name: Kuijken, Konrad
Publisher: name: arXiv
Year: 1997
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: It has been known that recent microlensing results towards the bulge imply mass densities that are surprisingly high given dynamical constraints on the Milky Way mass distribution. We derive the maximum optical depth towards the bulge that may be generated by axisymmetric structures in the Milky Way, and show that observations are close to surpassing these limits. This result argues in favor of a bar as a source of significantly enhanced microlensing. Several of the bar models in the literature are discussed.
description: Latex, 6 pages, 4 figures, uses aas2pp4 and epsf style files. Accepted for publication in ApJ Letters
Magnus expansion for a chirped quantum two-level system
Creators: name: Nalbach, Peter
name: Leyton, Vicente
Publisher: name: arXiv
Year: 2018
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We derive a Magnus expansion for a frequency chirped quantum two-level system. We obtain a time-independent effective Hamiltonian which generates a stroboscopic time evolution. At lowest order the according dynamics is identical to results from using a rotating wave approximation. We determine, furthermore, also the next higher order corrections within our expansion scheme in correspondence to the Bloch-Siegert shifts for harmonically driven systems. Importantly, our scheme can be extended to more complicated systems, i.e. even many-body systems.
description: 4 pages, 1 figure
Neutrino Propagation In Color Superconducting Quark Matter
Creators: name: Carter, Gregory W.
name: Reddy, Sanjay
Publisher: name: arXiv
Year: 2000
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We calculate the neutrino mean free path in color superconducting quark matter, and employ it to study the cooling of matter via neutrino diffusion in the superconducting phase as compared to a free quark phase. The cooling process slows when quark matter undergoes a second order phase transition to a superconducting phase at the critical temperature $T_c$. Cooling subsequently accelerates as the temperature decreases below $T_c$. This will directly impact the early evolution of a newly born neutron star should its core contain quark matter. Consequently, there may be observable changes in the early neutrino emission which would provide evidence for superconductivity in hot and dense matter.
description: 12 pages, 5 figures
MANETs monitoring with a distributed hybrid architecture
Creators: name: Alvarez, Jose
name: Maag, Stephan
name: Zaidi, Fatiha
Publisher: name: arXiv
Year: 2018
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Monitoring techniques have been deeply studied in wired networks using gossip and hierarchical approaches. However, when applied to a MANET, several problematics arise. We present a hybrid distributed monitoring architecture for MANETs. We get inspired of gossip-based and hierarchical-based algorithms for query dissemination and data aggregation. We define gossip-based mechanisms that help our virtual hierarchical topology to complete the data aggregation, and then ensure the stability and robustness of our approach in dynamic environments. We propose a fully distributed monitoring protocol that ease the nodes communications. We evaluate our approach by using NS3 and Docker.
description: 5 pages, 2 figures, presented at NCA 2016
State independent QKD
Creators: name: Kindler, Robert
name: Handsteiner, Johannes
name: Kysela, Jaroslav
name: Zhu, Kuntuo
name: Liu, Bo
name: Zeilinger, Anton
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present an adaptive procedure for aligning quantum non-locality experiments without any knowledge of the two-qudit state shared by the participating parties. The quantum state produced by the source, its unitary evolution as well as the actual measurement bases remain unknown to both parties at all times. The entanglement of the quantum state helps establish desired correlations between individual measurement bases of the two distant parties. We implement the procedure in a fiber-based quantum key distribution (QKD) setup with polarization-entangled photons, where we do not rely on any additional alignment tools such as lasers or polarizers. In a QKD scenario the procedure can be done without any additional measurements as those that are performed regardless.
description: 8 pages, 5 figures