cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Dynamical encircling exceptional point in largely detuned multimode optomechanical system
Creators: name: Long, Dan
name: Mao, Xuan
name: Qin, Guo-Qing
name: Zhang, Hao
name: Wang, Min
name: Li, Gui-Qin
name: Long, Gui-Lu
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Dynamical encircling exceptional point(EP) shows a number of intriguing physical phenomena and its potential applications. To enrich the manipulations of optical systems in experiment, here, we study the dynamical encircling EP, i.e. state transfer process, in largely detuned multimode optomechanical system. The process of state transfer has been investigated with different factors about the location of start point, the orientation and the initial state of the trajectories around the EP in parameter space. Results show that the nonreciprocal and the chiral topological energy transfer between two optical modes are performed successfully by tuning the effective optomechanical coupling in the multimode system with large detuning. Moreover, the factor of evolution speed about system parameters is also discussed. Our work demonstrates the fundamental physics around EP in large detuning domain of multimode optomechanical system and provides an alternative for manipulating of optical modes in non-hermitian system.
description: 9 pages,7 figures
Stability analysis of non-Abelian electric fields
Creators: name: Pereira, Jude
name: Vachaspati, Tanmay
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the stability of fluctuations around a homogeneous non-Abelian electric field background that is of a form that is protected from Schwinger pair production. Our analysis identifies the unstable modes and we find a limiting set of parameters for which there are no instabilities. We discuss potential implications of our analysis for confining strings in non-Abelian gauge theories.
description: 8 pages, 5 figures
title: Σχεδίαση συστήματος στιγμιαίου δορυφορικού προσδιορισμού θέσης με αναδιατασσόμενη λογική σε ολοκληρωμένο σύστημα PolarFire
title: Implementation of Snapshot-Positioning on a PolarFire FPGA/SoC
Creators: name: Μαραγκου Σοφια
Publisher: name: Technical University of Crete
Year: 2019

description: Η Υπηρεσία Δημόσιου Χαρακτήρα (Public Regulated Service) του δορυφορικού συστήματος Galileo εγγυάται ασφαλή δορυφορική πλοήγηση για υπηρεσιακή χρήση του δημοσίου, πράγμα που κάνει την υλοποίηση απαιτητική σε θέματα ασφαλείας. Η μέθοδος στιγμιαίου δορυφορικού προσδιορισμού θέσης παρέχει ένα γρήγορο και αποδοτικό τρόπο εντοπισμού θέσης ταχύτητας και χρόνου (Position Velocity Time) με την χρήση βοηθητικών δεδομένων, με δείγματα μη επεξεργασμένα και με κώδικες ψευδοτυχαίου θορύβου. Στόχος αυτής της διπλωματικής είναι η υλοποίηση συστήματος στιγμιαίου δορυφορικού προσδιορισμού θέσης σε αναδιατασσόμενη λογική στο ολοκληρωμένο σύστημα PolarFire για ενσωματωμένο δέκτη σε πραγματικό χρόνο. Η επιλογή του ολοκληρωμένου συστήματος PolarFire έγινε βάσει των εγγυήσεων που παρέχει όσο αφορά την χαμηλή κατανάλωση ενέργειας και την ασφάλεια. Ο υπολογισμός της θέσης, της ταχύτητας και του χρόνου γίνεται σε RISC-V πρότυπο με χρήση της RV32IMA αρχιτεκτονικής σετ εντολών σε ενσωματωμένο soft core. Η διπλωματική εργασία αποτελείται από τρία μέρη: την σχεδίαση σε υλικό που υλοποιεί την μέθοδο απόκτησης σήματος, την εφαρμογή που ελέγχει την σχεδίαση υλικού και την εφαρμογή που υλοποιεί τον στιγμιαίο προσδιορισμό θέσης. Η σχεδίαση αποτελείται από τον soft core Mi-V της Microsemi και από ένα μέρος ελεύθερα διαμορφωμένης και προγραμματιζόμενης λογικής που ελέγχεται από μια εφαρμογή bare-metal σε γλώσσα C++. Η εφαρμογή στιγμιαίου προσδιορισμού έχει υλοποιηθεί σε γλώσσα C.
description: Galileo Public Regulated Service (PRS) is a special navigation service which guarantees secure EU satellite navigation for government use and thus it is high-secure demanding. A fast and efficient way to obtain position, velocity and time (PVT) is the method of snapshot positioning by having assistance data and raw data samples together with the pseudo-random noise (PRN) codes. The purpose of this thesis is to implement snapshot positioning on PolarFire FPGA for an embedded real-time receiver. The selection of PolarFire FPGA is based on the low-energy consumption and the security attributes it is offering. The complete PVT calculation is performed in the RISC-V standard RV32IMA instruction set architecture (ISA) embedded soft processor. The thesis consists of three parts the hardware design which implements the acquisition, the control of acquisition and the snapshot positioning application. The hardware design consists of the Mi-V soft core of Microsemi as CPU and a freely configurable and programmable logic part. It is controlled by a bare-metal application in C++. The snapshot positioning application is implemented in C.
A Challenging Solar Eruptive Event of 18 November 2003 and the Causes of the 20 November Geomagnetic Superstorm. I. Unusual History of an Eruptive Filament
Creators: name: Grechnev, V. V.
name: Uralov, A. M.
name: Slemzin, V. A.
name: Chertok, I. M.
name: Filippov, B. P.
name: Rudenko, G. V.
name: Temmer, M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: This is the first of four companion papers, which analyze a complex eruptive event of 18 November 2003 in AR 10501 and the causes of the largest Solar Cycle 23 geomagnetic storm on 20 November 2003. Analysis of a complete data set, not considered before, reveals a chain of eruptions to which hard X-ray and microwave bursts responded. A filament in AR 10501 was not a passive part of a larger flux rope, as usually considered. The filament erupted and gave origin to a CME. The chain of events was as follows: i) an eruption at 07:29 accompanied by a not reported M1.2 class flare associated with the onset of a first southeastern CME1, which is not responsible for the superstorm; ii) a confined eruption at 07:41 (M3.2 flare) that destabilized the filament; iii) the filament acceleration (07:56); iv) the bifurcation of the eruptive filament that transformed into a large cloud; v) an M3.9 flare in AR 10501 associated to this transformation. The transformation of the filament could be due to its interaction with the magnetic field in the neighborhood of a null point, located at a height of about 100 Mm above the complex formed by ARs 10501, 10503, and their environment. The CORONAS-F/SPIRIT telescope observed the cloud in 304 A as a large Y-shaped darkening, which moved from the bifurcation region to the limb. The masses and kinematics of the cloud and the filament were similar. Remnants of the filament were not observed in the second southwestern CME2, previously regarded as a source of the 20 November superstorm. These facts do not support a simple scenario, in which the interplanetary magnetic cloud is considered as a flux rope formed from a structure initially associated with the pre-eruption filament in AR 10501. Observations suggest a possible additional eruption above the bifurcation region close to solar disk center between 08:07 and 08:17 that could be the source of the superstorm.
description: 34 pages, 17 figures. For associated movie files, see http://ru.iszf.irk.ru/~grechnev/papers/2003-11-18_I/ The final publication is available at Springer via http://dx.doi.org/10.1007/s11207-013-0316-6
title: Συμπερασμός με ανταλλαγή μηνυμάτων ως κατανεμημένος υπολογισμός
title: Message passing inference as distributed computation
Creators: name: Καραταρακης Ευαγγελος
Publisher: name: Technical University of Crete
Year: 2019

description: Με χρήση του πιθανοτικού συμπερασμού λύνονται προβλήματα, όπως η εύρεση μιας οριακής συνάρτησης πυκνότητας πιθανότητας, χωρίς διαδοχική ολοκλήρωση ή η λύση συστημάτων γραμμικών εξισώσεων μεγάλων διαστάσεων. Αλγόριθμοι, όπως ο Gaussian Belief Propagation (GaBP), εφαρμόζονται με ανταλλαγή μηνυμάτων σε πιθανοτικά γραφικά μοντέλα, ενώ η εφαρμογή τους γίνεται σε ασύγχρονη και σε σύγχρονη εκδοχή, με διαφορετικά πλεονεκτήματα ανά περίπτωση. Επομένως, είναι απαραίτητη η μελέτη ικανών και αναγκαίων συνθηκών σύγκλισης για κάθε εκδοχή. Οι σύγχρονοι αλγόριθμοι χαρακτηρίζονται από ικανές και αναγκαίες συνθήκες σύγκλισης, πράγμα το οποίο ισχύει και για τον GaBP. Οι ασύγχρονοι χαρακτηρίζονται κυρίως από ικανές (και όχι αναγκαίες) συνθήκες σύγκλισης και έχουν μεγάλο ερευνητικό ενδιαφέρον. Ανταλλαγή μηνυμάτων μπορεί να συμβεί και κατά την ασύγχρονη κατανεμημένη εκδοχή του αλγορίθμου Jacobi, με χρήση ενός πλήθους επεξεργαστών. Ο αλγόριθμος αυτός, αν και δεν ανήκει στην κατηγορία του πιθανοτικού συμπερασμού, μπορεί να προσφέρει χρήσιμες ιδέες στην μελέτη της ασύγχρονης εκδοχής του GaBP. Σημειώνεται ότι ο αλγόριθμος Jacobi αποτελεί ειδική περίπτωση του αλγορίθμου GaBP, όπως πρόσφατα αναφέρθηκε στην βιβλιογραφία. Συγκεκριμένα, αξιοποιούνται πρόσφατα ευρήματα για τον ασύγχρονο Jacobi, όπου το ελάχιστο μονοπάτι στον γράφο που περιγράφει το χρονοδιάγραμμα ανταλλαγής μηνυμάτων, καθορίζει μετρικές σύγκλισης. Στην εργασία αυτή έγινε αξιοποίηση αυτής της μεθοδολογίας στην μελέτη του ασύγχρονου GaBP, κατόπιν παρατήρησης ότι οι αναδρομικές εξισώσεις ανανέωσης των μηνυμάτων του είναι εν μέρει γραμμικές. Το τελευταίο προέκυψε από πρόσφατες μελέτες, όπου φαίνεται ότι ο αλγόριθμος GaBP μπορεί να περιγραφεί μέσω της επίλυσης ενός προβλήματος βελτιστοποίησης, το οποίο καταλήγει σε ένα σύστημα γραμμικών εξισώσεων. Επίσης, μελετήθηκε η συμπεριφορά του ελάχιστου μονοπατιού στο γράφο για μια σειρά προβλημάτων, στα οποία εκτελείται ο ασύγχρονος κατανεμημένος Jacobi.
Tunable high-resolution synthetic aperture radar imaging
Creators: name: Kim, Arnold D.
name: Tsogka, Chrysoula
Publisher: name: arXiv
Year: 2022
Subjects: subject: Signal Processing (eess.SP)
subject: Geophysics (physics.geo-ph)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Physical sciences

description: We have recently introduced a modification of the multiple signal classification (MUSIC) method for synthetic aperture radar. This method depends on a tunable, user-defined parameter, $ε$, that allows for quantitative high-resolution imaging. It requires however, relative large single-to-noise ratios (SNR) to work effectively. Here, we first identify the fundamental mechanism in that method that produces high-resolution images. Then we introduce a modification to Kirchhoff Migration (KM) that uses the same mechanism to produces tunable, high-resolution images. This modified KM method can be applied to low SNR measurements. We show simulation results that demonstrate the features of this method.
The use of double-mode RR Lyrae stars as robust distance and metallicity indicators
Creators: name: Chen, Xiaodian
name: Zhang, Jianxing
name: Wang, Shu
name: Deng, Licai
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: RR Lyrae stars are one of the primary distance indicators for old stellar populations such as globular clusters, dwarf galaxies and galaxies. Typically, fundamental-mode RR Lyr stars are used for distance measurements, and their accuracy is strongly limited by the dependence of absolute magnitudes on metallicity, in both the optical and infrared bands. Here, we report the discovery of a period-(period ratio)-metallicity relation for double-mode RR Lyr stars, which can predict metallicity as accurately as the low-resolution spectra. With theoretical and observational evidence, we propose that the period-luminosity relation of double-mode RR Lyr stars is not affected by the metallicity. Combining the Large Magellanic Cloud distance and Gaia parallaxes, we calibrate the zero point of the period-luminosity relation to an error of 0.022 mag, which means that in the best case double-mode RR Lyr stars can anchor galaxy distances to an accuracy of 1.0%. For four globular clusters and two dwarf galaxies, we obtain distances using double-mode RR Lyr stars with a distance accuracy of 2-3% and 1-2%, respectively. With future telescopes such as the China Space Station Telescope and the Vera C. Rubin Observatory, double-mode RR Lyr stars will be established as an independent distance ladder in the near-field universe.
description: 19 pages, 3 figures
title: Diplomacy in transition : Portugal’s experience with the transfer of Macao
Creators: name: Mendonça Martins da Cruz, António Manuel de
Publisher: name: Universidade Lusíada Editora
Year: 2020

description: Estudos em homenagem ao professor António Martins da Cruz / coord. José de Matos Correia, Ricardo Leite Pinto. - Lisboa : Universidade Lusíada, 2020. - P. 149-161.
Relativisation makes contradictions harder for Resolution
Creators: name: Dantchev, Stefan
name: Martin, Barnaby
Publisher: name: arXiv
Year: 2013
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: We provide a number of simplified and improved separations between pairs of Resolution-with-bounded-conjunction refutation systems, Res(d), as well as their tree-like versions, Res*(d). The contradictions we use are natural combinatorial principles: the Least number principle, LNP_n and an ordered variant thereof, the Induction principle, IP_n. LNP_n is known to be easy for Resolution. We prove that its relativisation is hard for Resolution, and more generally, the relativisation of LNP_n iterated d times provides a separation between Res(d) and Res(d+1). We prove the same result for the iterated relativisation of IP_n, where the tree-like variant Res*(d) is considered instead of Res(d). We go on to provide separations between the parameterized versions of Res(1) and Res(2). Here we are able again to use the relativisation of the LNP_n, but the classical proof breaks down and we are forced to use an alternative. Finally, we separate the parameterized versions of Res*(1) and Res*(2). Here, the relativisation of IP_n will not work as it is, and so we make a vectorising amendment to it in order to address this shortcoming
title: A aprendizagem e as empresas : a relevância das formas de mercado
Creators: name: Duarte Rebelo de Sousa, António Jorge
Publisher: name: Universidade Lusíada Editora
Year: 2020

description: Estudos em homenagem ao professor António Martins da Cruz / coord. José de Matos Correia, Ricardo Leite Pinto. - Lisboa : Universidade Lusíada, 2020. - P. 163-172.
Orientation Echoes via Concerted Terahertz and Near-IR excitation
Creators: name: Damari, Ran
name: Beer, Amit
name: Fleischer, Sharly
Publisher: name: arXiv
Year: 2022
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: A new and efficient method for orientation echo spectroscopy is presented and realized experimentally. The excitation scheme utilizes concerted rotational excitations by both ultrashort terahertz and near-IR pulses and its all-optical detection is enabled by Molecular Orientation Induced Second Harmonic method [J.Phys.Chem.A 126, 3732-3738 (2022)]. The method provides practical means for orientation echo spectroscopy of gas phase molecules and highlights the intriguing underlying physics of coherent rotational dynamics induced by judiciously-orchestrated interactions with both resonant (terahertz) and nonresonant (NIR) light pulses.
title: Direito do Trabalho, mandamentos e questões eternas
Creators: name: Moreira, António José
Publisher: name: Universidade Lusíada Editora
Year: 2020

description: Estudos em homenagem ao professor António Martins da Cruz / coord. José de Matos Correia, Ricardo Leite Pinto. - Lisboa : Universidade Lusíada, 2020. - P. 117-148.
Causality bounds chaos in geodesic motions
Creators: name: Hashimoto, Koji
name: Sugiura, Kakeru
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: Predictability is ensured by causality while lost in chaos. To reconcile these two popular notions, we study chaos in geodesic motions in generic curved spacetimes with external potentials, where causality is controlled by a scalar potential. We develop a reparametrization-independent method to analytically estimate the Lyapunov exponent $λ$ of a particle motion. We show that causality gives the universal upper bound $λ\propto E\ (E\rightarrow\infty)$, which coincides with the chaos energy bound proposed by Murata, Tanahashi, Watanabe, and one of the authors (K.H.). We also find that the chaos bound discovered by Maldacena, Shenker, and Stanford can be violated in particular potentials, even with causality. Our estimates, although waiting for numerical confirmation, reveal the hidden nature of physical theories: causality bounds chaos.
description: 20 pages. v2: typos corrected, references added
title: A informação financeira como instrumento de previsão da crise empresarial : evidência empírica nas PME portuguesas
Creators: name: Anjos, António José
Publisher: name: Universidade Lusíada Editora
Year: 2020

description: Estudos em homenagem ao professor António Martins da Cruz / coord. José de Matos Correia, Ricardo Leite Pinto. - Lisboa : Universidade Lusíada, 2020. - P. 97-115.
Charge and spin correlations of a Peierls insulator after a quench
Creators: name: Hohenadler, Martin
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Electron-phonon coupling plays a central role for time-dependent phenomena in condensed matter, for example in photo-excitation experiments. We use the continuous-time quantum Monte Carlo method to study the real-time evolution of charge and spin correlation functions of a Peierls insulator after a quench to a noninteracting Hamiltonian. This approach gives exact results, and fully takes into account quantum phonon effects without relying on a Hilbert space truncation. It is also free from a dynamical sign problem. The observed time dependence is compared to free-fermion time evolution starting from a dimerized state. Our exact results provide a benchmark for more realistic calculations, and may be directly applicable to experiments with cold atoms or trapped ions.
description: 6 pages, 3 figures; final version with additional results
Log it: How to fit an active Brownian particle's mean squared displacement with improved parameter estimation
Creators: name: Bailey, Maximilian
name: Sprenger, Alexander
name: Grillo, Fabio
name: Löwen, Hartmut
name: Isa, Lucio
Publisher: name: arXiv
Year: 2022
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The active Brownian particle (ABP) model is widely used to describe the dynamics of active matter systems, such as Janus microswimmers. In particular, the analytical expression for an ABP's mean-squared-displacement (MSD) is useful as it provides a means to describe the essential physics of a self-propelled, spherical Brownian particle. However, the truncated or 'short-time' form of the MSD equation is typically fitted, which can lead to significant problems in parameter estimation. Furthermore, heteroscedasticity and the often statistically dependent observations of an ABP's MSD lead to a situation where standard ordinary least squares (OLS) regression will obtain biased estimates and unreliable confidence intervals. Here, we propose to revert to always fitting the full expression of an ABP's MSD at short timescales, using bootstrapping to construct confidence intervals of the fitted parameters. Additionally, after comparison between different fitting strategies, we propose to extract the physical parameters of an ABP using its mean logarithmic squared displacement (MLSD). These steps improve the estimation of an ABP's physical properties, and provide more reliable confidence intervals, which are critical in the context of a growing interest in the interactions of microswimmers with confining boundaries and the influence on their motion.
description: 20 pages, 5 figures
One condition for solution uniqueness and robustness of both l1-synthesis and l1-analysis minimizations
Creators: name: Zhang, Hui
name: Yan, Ming
name: Yin, Wotao
Publisher: name: arXiv
Year: 2013
Subjects: subject: Information Theory (cs.IT)
subject: Optimization and Control (math.OC)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: The $\ell_1$-synthesis model and the $\ell_1$-analysis model recover structured signals from their undersampled measurements. The solution of former is a sparse sum of dictionary atoms, and that of the latter makes sparse correlations with dictionary atoms. This paper addresses the question: when can we trust these models to recover specific signals? We answer the question with a condition that is both necessary and sufficient to guarantee the recovery to be unique and exact and, in presence of measurement noise, to be robust. The condition is one--for--all in the sense that it applies to both of the $\ell_1$-synthesis and $\ell_1$-analysis models, to both of their constrained and unconstrained formulations, and to both the exact recovery and robust recovery cases. Furthermore, a convex infinity--norm program is introduced for numerically verifying the condition. A comprehensive comparison with related existing conditions are included.
description: 15 pages, 0 figures
Primordial power spectrum: a complete analysis with the WMAP nine-year data
Creators: name: Hazra, Dhiraj Kumar
name: Shafieloo, Arman
name: Souradeep, Tarun
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: We have improved further the error sensitive Richardson-Lucy deconvolution algorithm making it applicable directly on the un-binned measured angular power spectrum of Cosmic Microwave Background observations to reconstruct the form of the primordial power spectrum. This improvement makes the application of the method significantly more straight forward by removing some intermediate stages of analysis allowing a reconstruction of the primordial spectrum with higher efficiency and precision and with lower computational expenses. Applying the modified algorithm we fit the WMAP 9 year data using the optimized reconstructed form of the primordial spectrum with more than 300 improvement in χ^2 with respect to the best fit power-law. This is clearly beyond the reach of other alternative approaches and reflects the efficiency of the proposed method in the reconstruction process and allow us to look for any possible feature in the primordial spectrum projected in the CMB data. Though the proposed method allow us to look at various possibilities for the form of the primordial spectrum, all having good fit to the data, proper error-analysis is needed to test for consistency of theoretical models since, along with possible physical artefacts, most of the features in the reconstructed spectrum might be arising from fitting noises in the CMB data. Reconstructed error-band for the form of the primordial spectrum using many realizations of the data, all bootstrapped and based on WMAP 9 year data, shows proper consistency of power-law form of the primordial spectrum with the WMAP 9 data at all wave numbers. Including WMAP polarization data in to the analysis have not improved much our results due to its low quality but we expect Planck data will allow us to make a full analysis on CMB observations on both temperature and polarization separately and in combination.
description: 19 pages, 5 figures, discussions extended, results unchanged, matches the final version published in JCAP. Note: JCAP published version contains minor typesetting errors (introduced by JCAP at the proof stage) in the plot labels
Sample Variance for Supernovae Distance Measurements and the Hubble tension
Creators: name: Zhai, Zhongxu
name: Percival, Will J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Recent local measurements of the Hubble constant made using supernovae have delivered a value that differs by $\sim$5$σ$ (statistical error) from predictions using the Cosmic Microwave Background (CMB), or using Baryon Acoustic Oscillations (BAO) and Big-Bang Nucleosynthesis (BBN) constraints, which are themselves consistent. The effective volume covered by the supernovae is small compared to the other probes, and it is therefore interesting to consider whether sample variance (often also called cosmic variance) is a significant contributor to the offset. We consider four ways of calculating the sample variance: (i) perturbation theory applied to the luminosity distance, which is the most common method considered in the literature; (ii) perturbation of cosmological parameters, as is commonly used to alleviate super-sample covariance in sets of N-body simulations; (iii) a new method based on the variance between perturbed spherical top-hat regions; (iv) using numerical N-body simulations. All give consistent results showing that, for the Pantheon supernova sample, sample variance can only lead to fluctuations in $H_0$ of order $\pm1$ km s$^{-1}$Mpc$^{-1}$ or less. While this is not in itself a new result, the agreement between the methods used adds to its robustness. Furthermore, it is instructive to see how the different methods fit together. We also investigate the internal variance of the $H_{0}$ measurement using SH0ES and Pantheon data. By searching for an offset between measurements in opposite hemispheres, we find that the direction coincident with the CMB dipole has a higher $H_{0}$ measurement than the opposite hemisphere by roughly 4 km s$^{-1}$Mpc$^{-1}$. We compare this with a large number of simulations and find that the size of this asymmetry is statistically likely, but the preference of direction may indicate that further calibration is needed.
description: 13 pages, 5 figures; comments welcome
Existence of an endogenously complete equilibrium driven by a diffusion
Creators: name: Kramkov, Dmitry
Publisher: name: arXiv
Year: 2013
Subjects: subject: Probability (math.PR)
subject: General Finance (q-fin.GN)
subject: FOS: Mathematics
subject: FOS: Economics and business
subject: 91B50, 91B51, 60G44, 26E05

description: The existence of complete Radner equilibria is established in an economy which parameters are driven by a diffusion process. Our results complement those in the literature. In particular, we work under essentially minimal regularity conditions and treat time-inhomogeneous case.
description: minor changes to make it identical to the version accepted by Finance and Stochastics
title: Δεικτοδότηση μεγάλης κλίμακας δεδομένων για υποστήριξη χωρικών επερωτημάτων στο Hadoop DFS
Creators: name: Γεωργιακάκη Σοφία
Publisher: name: Technical University of Crete
Year: 2011

description: Μη διαθέσιμο
Restoring and tailoring very high dimensional spatial entanglement of a biphoton state transmitted through a scattering medium
Creators: name: Devaux, Fabrice
name: Mosset, Alexis
name: Popoff, Sébastien M.
name: Lantz, Eric
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We report experimental results where a momentum entangled biphoton state with a giant dimensionality of 8000 is retrieved and manipulated when only one photon of the pair is transmitted through a thin scattering medium. For this purpose, the transmission matrix of the complex medium is first measured with a phase-shifting interferometry measurement method using a spatial light modulator (SLM) illuminated with a laser source. From this matrix, different phase masks are calculated and addressed on the SLM to spatially control the focusing of the laser through the complex medium. These same masks are used to manipulate the phase of the biphoton wave function transmitted by the thin diffuser in order to restore and control in the same way the momentum correlations between the far-field images of twin beams issued from strongly spatial-multi-mode spontaneous parametric down conversion.
description: 5 pages, 4 figures
Cosmological parameter estimation with free-form primordial power spectrum
Creators: name: Hazra, Dhiraj Kumar
name: Shafieloo, Arman
name: Souradeep, Tarun
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Constraints on the main cosmological parameters using CMB or large scale structure data are usually based on power-law assumption of the primordial power spectrum (PPS). However, in the absence of a preferred model for the early universe, this raises a concern that current cosmological parameter estimates are strongly prejudiced by the assumed power-law form of PPS. In this paper, for the first time, we perform cosmological parameter estimation allowing the free form of the primordial spectrum. This is in fact the most general approach to estimate cosmological parameters without assuming any particular form for the primordial spectrum. We use direct reconstruction of the PPS for any point in the cosmological parameter space using recently modified Richardson-Lucy algorithm however other alternative reconstruction methods could be used for this purpose as well. We use WMAP 9 year data in our analysis considering CMB lensing effect and we report, for the first time, that the flat spatial universe with no cosmological constant is ruled out by more than 4σconfidence limit without assuming any particular form of the primordial spectrum. This would be probably the most robust indication for dark energy using CMB data alone. Our results on the estimated cosmological parameters show that higher values of baryonic and matter density and lower value of Hubble parameter (in comparison to the estimated values by assuming power-law PPS) is preferred by the data. However, the estimated cosmological parameters by assuming free form of the PPS have overlap at 1σconfidence level with the estimated values assuming power-law form of PPS.
description: 6 pages, 3 figures, discussions extended, results unchanged, matches the final version published in PRD
Partial-wave expansion of $ΛNN$ three-baryon interactions in chiral effective field theory
Creators: name: Kohno, M.
name: Kamada, H.
name: Miyagawa, K.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: An expression of partial wave expansion of three-baryon interactions in chiral effective field theory is presented. The derivation follows the method by Hebeler et al. [Phys. Rev. C{\bf 91}, 044001 (2015)], but the final expression is more general. That is, a systematic treatment of the higher-rank spin-momentum structure of the interaction becomes possible. Using the derived formula, a $Λ$-deuteron folding potential is evaluated. This information is valuable for inferring the possible contribution of the $ΛNN$ three-baryon forces to the hypertriton as the basis of further studies by sophisticated Faddeev calculations. A microscopic understanding of $ΛNN$ three-baryon forces together with two-body $ΛN$ interactions is essential for the description of hypernuclei and neutron-star matter.
description: 7 pages, 4 figures. The version accepted for publication in Phys. Rev. C. The results of the numerical calculation have been revised
Indications for a Nonzero Lepton Asymmetry from Extremely Metal-Poor Galaxies
Creators: name: Burns, Anne-Katherine
name: Tait, Tim M. P.
name: Valli, Mauro
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The recent measurement of helium-4 from the near-infrared spectroscopy of extremely metal-poor galaxies (EMPGs) by the Subaru Survey may point to a new puzzle in the Early Universe. We exploit this new helium measurement together with the percent-level determination of primordial deuterium, to assess indications for a non-vanishing lepton asymmetry during the Big Bang Nucleosynthesis (BBN) era, paying particular attention to the role of uncertainties in the nuclear reaction network. A cutting-edge Bayesian analysis focused on the role of the newly measured EMPGs, jointly with information from the Cosmic Microwave Background, suggests the existence of a nonzero lepton asymmetry at around the $2 σ$ level, providing a hint for cosmology beyond $Λ$CDM. We discuss conditions for a large total lepton asymmetry to be consistently realized in the Early Universe.
description: Analysis updated with Astrophys.J. 941 (2022) 2, 167. 95% joint probability distribution now shown in Fig.1. Minor modifications of the text, conclusions unchanged. Version matches publication in Physical Review Letters
title: Εφαρμογή τεχνολογίας μεμβρανών νανοδιήθησης σε υδατικά διαλύματα. Μελέτη επίδρασης ιοντικής ισχύος, pH σε μεμβράνες νανοδιήθησης
Creators: name: Φουντούλης Γιώργος Β.
Publisher: name: Technical University of Crete
Year: 2010

description: Μη διαθέσιμο
Robust-to-loss entanglement generation using a quantum plasmonic nanoparticle array
Creators: name: Lee, Changhyoup
name: Tame, Mark
name: Noh, Changsuk
name: Lim, James
name: Maier, Stefan A.
name: Lee, Jinhyoung
name: Angelakis, Dimitris G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We introduce a scheme for generating entanglement between two quantum dots using a plasmonic waveguide made from an array of metal nanoparticles. We show that the scheme is robust to loss, enabling it to work over long distance plasmonic nanoparticle arrays, as well as in the presence of other imperfections such as the detuning of the energy levels of the quantum dots. The scheme represents an alternative strategy to the previously introduced dissipative driven schemes for generating entanglement in plasmonic systems. Here, the entanglement is generated by using dipole-induced interference effects and detection-based postselection. Thus, contrary to the widely held view that loss is major problem for quantum plasmonic systems, we provide a robust-to-loss entanglement generation scheme that could be used as a versatile building block for quantum state engineering and control at the nanoscale.
description: 32 pages, 11 figures
title: Αναδρομικά φράκταλ
Creators: name: Δημητριάδης Αλέξανδρος
Publisher: name: Technical University of Crete
Year: 2010

description: φ. 1: Μια πρώτη γνωριμία με τον κόσμο των φράκταλ με τα μάτια της φυσικής -- Κεφ. 2: Τα μαθηματικά των φράκταλ διαστάσεων -- Κεφ. 3: Αλγεβρικός φορμαλισμός των φράκταλ συσσωματωμάτων -- Κεφ. 4: Ανάλυση σε φράκταλ συσσωματώματα
title: Σύνθετα υλικά με θερμοπλαστική μήτρα
Creators: name: Καβελάκης Ευθύμιος
Publisher: name: Technical University of Crete
Year: 2009

description:  Θερμοπλαστικά σύνθετα υλικά -- 2. Διεργασίες παρασκευής  -- 3. Μηχανικές ιδιότητες -- 4. Πειραματική διαδικασία -- 5. Ανάλυση αποτελεσμάτων
Spin and charge density waves in the quasi-one-dimensional KMn6Bi5
Creators: name: Bao, Jin-Ke
name: Cao, Huibo
name: Krogstad, Matthew J.
name: Taddei, Keith M.
name: Shi, Chenfei
name: Cao, Shixun
name: Lapidus, Saul H.
name: van Smaalen, Sander
name: Chung, Duck Young
name: Kanatzidis, Mercouri G.
name: Rosenkranz, Stephan
name: Chmaissem, Omar
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: AMn6Bi5 materials (A = Na, K, Rb and Cs) consisting of unique Mn-cluster chains emerge as a new family of superconductors with the suppression of their antiferromagnetic (AFM) order under high pressures. Here, we report transverse incommensurate spin density waves (SDWs) for the Mn atoms with a propagating direction along the chain axes as a ground state for KMn6Bi5 by single crystal neutron diffraction. The SDWs have a refined amplitude of ~2.46 Bohr magnetons for the Mn atoms in the pentagons and ~0.29 Bohr magnetons with a large standard deviation for Mn atoms in the center between the pentagons. AFM dominate both the nearest-neighbor Mn-Mn interactions within the pentagon and next-nearest-neighbor Mn-Mn interactions out of the pentagon (along the propagating wave). The SDWs exhibit both local and itinerant characteristics probably formed by a cooperative interaction between local magnetic exchange and conduction electrons. A significant magnetoelastic effect during the AFM transition, especially along the chain direction, has been demonstrated by temperature-dependent x-ray powder diffraction. Single crystal x-ray diffraction below the AFM transition revealed satellite peaks originating from charge density waves along the chain direction with a q-vector twice as large as the SDW one, pointing to a strong real space coupling between them. Our work not only manifests a fascinating interplay among spin, charge, lattice and one dimensionality to trigger intertwined orders in KMn6Bi5 but also provides important piece of information for the magnetic structure of the parent compound to understand the mechanism of superconductivity in this new family.
title: Πολιτικοοικονομικές επιλογές, αδιέξοδα και προοπτικές στο ενεργειακό ζήτημα
Creators: name: Καλογριδάκη Αναστασία
Publisher: name: Technical University of Crete
Year: 2010

description: φ. 1: Ιστορική ανασκόπηση του ενεργειακού ζητήματος -- Κεφ. 2: Ιστορική ανάλυση των ενεργειακών πηγών στα πλαίσια του καπιταλισμού -- Κεφ. 3: Ορυκτά καύσιμα και ανανεώσιμες μορφές ενέργειας: αποτελούν οι ανανεώσιμες πηγές λύση του προβλήματος; -- Κεφ. 4: Η σημερινή κατάσταση στη διεθνή και την ελληνική οικονομία σε σχέση με την ενέργεια -- Κεφ. 5: Το νομοθετικό πλαίσιο
Ideal refocusing of an optically active spin qubit under strong hyperfine interactions
Creators: name: Zaporski, Leon
name: Shofer, Noah
name: Bodey, Jonathan H.
name: Manna, Santanu
name: Gillard, George
name: Jackson, Daniel M.
name: Appel, Martin Hayhurst
name: Schimpf, Christian
name: da Silva, Saimon Covre
name: Jarman, John
name: Delamare, Geoffroy
name: Park, Gunhee
name: Haeusler, Urs
name: Chekhovich, Evgeny A.
name: Rastelli, Armando
name: Gangloff, Dorian A.
name: Atatüre, Mete
name: Gall, Claire Le
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Combining highly coherent spin control with efficient light-matter coupling offers great opportunities for quantum communication and networks, as well as quantum computing. Optically active semiconductor quantum dots have unparalleled photonic properties, but also modest spin coherence limited by their resident nuclei. Here, we demonstrate that eliminating strain inhomogeneity using lattice-matched GaAs-AlGaAs quantum dot devices prolongs the electron spin coherence by nearly two orders of magnitude, beyond 0.113(3) ms. To do this, we leverage the 99.30(5)% fidelity of our optical pi-pulse gates to implement dynamical decoupling. We vary the number of decoupling pulses up to N = 81 and find a coherence time scaling of N^{0.75(2)}. This scaling manifests an ideal refocusing of strong interactions between the electron and the nuclear-spin ensemble, holding the promise of lifetime-limited spin coherence. Our findings demonstrate that the most punishing material science challenge for such quantum-dot devices has a remedy, and constitute the basis for highly coherent spin-photon interfaces.
Entanglement subspaces, trial wavefunctions, and special Hamiltonians in the fractional quantum Hall effect
Creators: name: Jackson, T. S.
name: Read, N.
name: Simon, S. H.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider spaces of trial wavefunctions for ground states and edge excitations in the fractional quantum Hall effect that can be obtained in various ways. In one way, functions are obtained by analyzing the entanglement of the ground state wavefunction, partitioned into two parts. In another, functions are defined by the way in which they vanish as several coordinates approach the same value, or by a projection-operator Hamiltonian that enforces those conditions. In a third way, functions are given by conformal blocks from a conformal field theory (CFT). These different spaces of functions are closely related. The use of CFT methods permits an algebraic formulation to be given for all of them. In some cases, we can prove that there is a ground state, a Hamiltonian, and a CFT such that, for any number of particles, all of these spaces are the same. For such cases, this resolves several questions and conjectures: it gives a finite-size bulk-edge correspondence, and we can use the analysis of functions to construct a projection-operator Hamiltonian that produces those functions as zero-energy states. For a model related to the N=1 superconformal algebra, the corresponding Hamiltonian imposes vanishing properties involving only three particles; for this we determine all the wavefunctions explicitly. We do the same for a sequence of models involving the M(3,p) Virasoro minimal models that has been considered previously, using results from the literature. We exhibit the Hamiltonians for the first few cases of these. The techniques we introduce can be applied in numerous examples other than those considered here.
description: 28 pages. v2: two new appendices, in particular an improved proof of Theorem 2; now 31 pages. v3: minor changes, refs added, as published
Sigillata-Stempel und -Formen der städtischen Ältertumssammlung in Kleve
Creators: name: Mestwerdt, Georg
Publisher: name: Bonner Jahrbücher
Year: 2017

description: [nicht vorhanden / not available]
description: Bonner Jahrbücher, Bd. 104 (1899): Bonner Jahrbücher : Jahrbücher des Vereins von Altertumsfreunden im Rheinlande
Static Energy in ($2+1+1$)-Flavor Lattice QCD: Scale Setting and Charm Effects
Creators: name: TUMQCD Collaboration
name: Brambilla, Nora
name: Delgado, Rafael L.
name: Kronfeld, Andreas S.
name: Leino, Viljami
name: Petreczky, Peter
name: Steinbeißer, Sebastian
name: Vairo, Antonio
name: Weber, Johannes H.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present results for the static energy in ($2+1+1$)-flavor QCD over a wide range of lattice spacings and several quark masses, including the physical quark mass, with ensembles of lattice-gauge-field configurations made available by the MILC Collaboration. We obtain results for the static energy out to distances of nearly $1$~fm, allowing us to perform a simultaneous determination of the scales $r_{1}$ and $r_{0}$, as well as the string tension $σ$. For the smallest three lattice spacings we also determine the scale $r_{2}$. Our results for $r_{0}/r_{1}$ and $r_{0}\sqrtσ$ agree with published ($2+1$)-flavor results. However, our result for $r_{1}/r_{2}$ differs significantly from the value obtained in the ($2+1$)-flavor case, which is most likely due to the effect of the charm quark. We also report results for $r_{0}$, $r_{1}$, and $r_{2}$ in~fm, with the former two being slightly lower than published ($2+1$)-flavor results. We study in detail the effect of the charm quark on the static energy by comparing our results on the finest two lattices with the previously published ($2+1$)-flavor QCD results at similar lattice spacing. We find that for $r > 0.2$~fm our results on the static energy agree with the ($2+1$)-flavor result, implying the decoupling of the charm quark for these distances. For smaller distances, on the other hand, we find that the effect of the dynamical charm quark is noticeable. The lattice results agree well with the two-loop perturbative expression of the static energy incorporating finite charm mass effects. This is the first time that the decoupling of the charm quark is observed and quantitatively analyzed on lattice data of the static energy.
description: 51 pages, 37 figures, journal version
Charge relaxation dynamics of an electrolytic nanocapacitor
Creators: name: Thakore, Vaibhav
name: Hickman, James J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Understanding ion relaxation dynamics in overlapping electric double layers (EDLs) is critical for the development of efficient nanotechnology based electrochemical energy storage, electrochemomechanical energy conversion and bioelectrochemical sensing devices as well as controlled synthesis of nanostructured materials. Here, a Lattice Boltzmann (LB) method is employed to simulate an electrolytic nanocapacitor subjected to a step potential at t = 0 for various degrees of EDL overlap, solvent viscosities, ratios of cation to anion diffusivity and electrode separations. The use of a novel, continuously varying and Galilean invariant, molecular speed dependent relaxation time (MSDRT) with the LB equation recovers a correct microscopic description of the molecular collision phenomena and enhances the stability of the LB algorithm. Results for large EDL overlaps indicated oscillatory behavior for the ionic current density in contrast to monotonic relaxation to equilibrium for low EDL overlaps. Further, at low solvent viscosities and large EDL overlaps, anomalous plasma-like spatial oscillations of the electric field were observed that appeared to be purely an effect of nanoscale confinement. Employing MSDRT in our simulations enabled a modeling of the fundamental physics of the transient charge relaxation dynamics in electrochemical systems operating away from equilibrium wherein Nernst-Einstein relation is known to be violated.
description: Accepted for publication in the Journal of Physical Chemistry C on October 30 2014. Supplementary info available free of charge via the Internet at http://pubs.acs.org. Revised version includes more details on the computation of the molecular speed dependent relaxation time (MSDRT) and emphasizes the Galilean invariance of the computed MSDRT
Axion-like particles from primordial black hole evaporation and their detection in neutrino experiments
Creators: name: Li, Tong
name: Zhang, Rui-Jia
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The primordial black holes (PBHs) play as a novel source to radiate light elementary particles of energies in the region of a few hundred MeV. We explore the possibility that the axion-like particles (ALPs) with mass less than 1 MeV are produced from PBH evaporation. The absorption of light ALPs in the underground detector targets then induces energetic photoelectron signatures in current and future neutrino experiments. Utilizing the PBH ALP event rate, we place general exclusion limits on the axion couplings at Super-K and Hyper-K. We also translate these limits into the upper bound on the fraction of DM composed of PBHs $f_{\rm PBH}$.
description: 18 pages, 5 figures. Version accepted for publication in PRD