Article
Astronomy & Astrophysics
Yu-Ying He, Xin-Jian Wen
Summary: The thermodynamics of finite size quark matter in the quasiparticle model is studied. An effective bag function is used to consider the medium effect to the confinement. Analytic surface tensions in strong magnetic fields are obtained using the multiple reflection expansion, showing anisotropic structures with splitting between longitudinal and transverse surface tensions. The anisotropy of surface tension can be enhanced by higher magnetic fields, and the surface tension is modified by an additional term related to the bag function.
Article
Astronomy & Astrophysics
J. Sedaghat, S. M. Zebarjad, G. H. Bordbar, B. Eslam Panah
Summary: We have performed a leading order perturbative calculation to obtain the equation of state (EoS) of strange quark matter (SQM) at zero temperature under a magnetic field B = 10(18) G. The obtained EoS is then used to calculate the maximum gravitational mass and corresponding radius of a magnetized strange quark star (SQS). The results show a maximum gravitational mass over three times the solar mass, and the validity of isotropic structure calculations for SQS is investigated.
Article
Astronomy & Astrophysics
J. R. Stone, V Dexheimer, P. A. M. Guichon, A. W. Thomas, S. Typel
Summary: A new equation of state for cold and hot hyperonic matter has been developed in the context of the quark-meson-coupling model, yielding results compatible with existing nuclear physics constraints and astrophysical observations. The study explores the presence of hyperons in proto-neutron stars and neutron stars, as well as the nucleon-hyperon phase transition. Results show a correlation between hyperon presence and increasing temperature and density, with implications for understanding neutron star merger remnants.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Kamal Krishna Nath, Ritam Mallick, Sagnik Chatterjee
Summary: Recently, it has been discovered that neutron stars (and quark stars) follow certain universality, known as the I-Love-Q relations, meaning that knowledge of any one observable can provide insights into the structural and macro properties of these compact astrophysical objects. This universality is due to the low sensitivity of the relations to the equation of state (EoS) of matter. In this study, the consistency of universal relations for a generic family of equations of state was investigated, and it was found that the I-Love-Q trio holds relatively well up to a tolerance limit of 5% fractional percentage error, even with significant variations in the EoS.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Ankit Kumar, H. C. Das, S. K. Patra
Summary: Motivated by theoretical studies on efficient dark matter capture by neutron stars, this research explores the indirect effects of captured dark matter on the cooling mechanism of a neutron star. The study shows that varying dark matter momentum greatly modifies neutrino emissivity and investigates specific heat and thermal conductivity of a dark matter admixed star to explore cooling wave propagation within the star.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Hristijan Kochankovski, Angels Ramos, Laura Tolos
Summary: The FSU2H equation-of-state model is extended to finite temperature and it is found that temperature has a stronger effect on thermodynamical observables and the composition of neutron star cores when considering hyperonic degrees of freedom. The widely used Gamma law is not appropriate to reproduce the true thermal effects, especially when hyperons become abundant in the neutron star core. Simple parametrizations of the thermal index for nucleonic and hyperonic beta-stable neutrino-free matter are provided to make finite temperature equations of state easily accessible.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Ecology
Tomasz F. Stepinski
Summary: This paper discusses the method of using Boltzmann entropy to quantify the configurational complexity of landscapes and whether it adheres to the statistical mechanics framework. By comparing an illustrative example that adheres to the framework with the method of calculating Boltzmann entropy, it is concluded that the computation of Boltzmann entropy in the context of landscapes does not comply with statistical mechanics. Therefore, it does not provide a link between landscapes and thermodynamics, and claims that Shannon entropy cannot be used to assess the configurational complexity of landscape are incorrect.
Article
Astronomy & Astrophysics
Carolyn A. Raithel, Pedro Espino, Vasileios Paschalidis
Summary: Parametric equations of state provide an important tool for studying the effects of equations of state in neutron star merger simulations. In this study, a numerical validation is performed for parametrically calculating finite-temperature equations of state. The results show that the approximate model can accurately recreate the temperature and thermal pressure distribution, and the merger dynamics and gravitational wave signals are in agreement.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Mathematics, Interdisciplinary Applications
E. -M. Papia, A. Kondi, V. Constantoudis
Summary: This research aims to examine the differences between the creativity and expressive ability of Artificial Intelligence (AI) and humans in artistic creations through mathematical analysis. The results indicate that AI art differs not only in the schematic representation of images but also in color changes, particularly when it comes to pixels of similar intensity values.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Physics, Multidisciplinary
Yong-Jia Huang, Luca Baiotti, Toru Kojo, Kentaro Takami, Hajime Sotani, Hajime Togashi, Tetsuo Hatsuda, Shigehiro Nagataki, Yi-Zhong Fan
Summary: This study investigates fully general-relativistic binary-neutron-star merger simulations with quark-hadron crossover equations of state for the first time and analyzes the characteristic differences in the gravitational wave signals. The results are important for discriminating between different types of quark dynamics and future kilohertz gravitational wave observations.
PHYSICAL REVIEW LETTERS
(2022)
Article
Astronomy & Astrophysics
M. B. Albino, R. Fariello, F. S. Navarra
Summary: This study updated previous calculations, compared the results with recent data, and found that repulsive interactions are essential for reproducing experimental information. The equation of state remains compatible with all astrophysical observations, but the parameter window is now narrower.
Article
Astronomy & Astrophysics
E. Preau, A. Pascal, J. Novak, M. Oertel
Summary: Extensive numerical studies suggest that information on cold neutron stars and the cold nuclear equation of state cannot be obtained from masses and radii of proto-neutron stars determined in the first second after their birth in core-collapse supernova events. Additionally, properties of the proto-neutron star equation of state may also remain unknown due to a lack of information on the entropy or temperature distribution in such objects.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Noshad Khosravi Largani, Tobias Fischer, Armen Sedrakian, Mateusz Cierniak, David E. Alvarez-Castillo, David B. Blaschke
Summary: In this study, the universality of relations between global parameters of compact stars is investigated. The study confirms that these relations hold for both cold and hot nucleonic equations of state (EoS), as well as for EoS models that include a strong first-order phase transition from nucleonic to deconfined quark matter. The accuracy and coefficients of these universal relations are determined through fitting to computed data.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
E. H. Rodrigues, M. Dutra, O. Lourenco
Summary: We improve the van der Waals-type model by incorporating short-range correlations (SRCs). The resulting Clausius-Carnahan-Starling (CCS)-SRC model can reproduce the flow constraint at high-density regime and is consistent with astrophysical observational data. The values for the symmetry energy slope (L-0) of the model are in agreement with recent experiments.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Mathematics, Applied
Irina Bashkirtseva, Alexander Pankratov, Lev Ryashko
Summary: Motivated by uncertainty quantification in self-organization, this study investigates a spatially extended Sel'kov-Strogatz model of glycolysis to examine the patterns induced by Turing instability. The research reveals the phenomenon of homogeneous self-oscillations being suppressed by diffusion, resulting in the formation of stationary non-homogeneous pattern-attractors. Spectral coefficients technique and Shannon entropy are employed to quantify the uncertainty in the number and modality of pattern-attractors, enabling advanced parametric analysis.
PHYSICA D-NONLINEAR PHENOMENA
(2023)
Article
Physics, Nuclear
G. E. Pavlou, E. Mavrommatis, Ch. Moustakidis, J. W. Clark
EUROPEAN PHYSICAL JOURNAL A
(2017)
Article
Physics, Multidisciplinary
Ch C. Moustakidis, C. P. Panos
Article
Physics, Particles & Fields
J. D. Vergados, Ch. C. Moustakidis, Yeuk-Kwan E. Cheung, H. Ejiri, Yeongduk Kim, Jeong-Yeon Lee
ADVANCES IN HIGH ENERGY PHYSICS
(2018)
Article
Astronomy & Astrophysics
P. S. Koliogiannis, C. C. Moustakidis
ASTROPHYSICS AND SPACE SCIENCE
(2019)
Article
Physics, Multidisciplinary
C. P. Panos, Ch C. Moustakidis
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2019)
Article
Multidisciplinary Sciences
Alkiviadis Kanakis-Pegios, Polychronis S. Koliogiannis, Charalampos C. Moustakidis
Summary: This work investigates the GW190814 event observed by the LIGO/Virgo collaboration, discussing issues such as mass gap, speed of sound upper bounds, and nuclear equation of state. It highlights the importance of these studies in addressing problems related to neutron star mass and providing insights for future observations of similar isolated neutron stars or systems in the universe.
Article
Astronomy & Astrophysics
P. S. Koliogiannis, Ch C. Moustakidis
Summary: This study focuses on predicting the equation of state of hot, dense nuclear matter and its impact on the interior of neutron stars. Thermal effects are introduced in a self-consistent way, and a set of isothermal and isentropic equations of state are predicted for further research on nonrotating and rapidly rotating neutron stars.
ASTROPHYSICAL JOURNAL
(2021)
Article
Computer Science, Interdisciplinary Applications
S. Rizou, A. Paflioti, A. Theofilatos, A. Vakali, G. Sarigiannidis, K. Ch. Chatzisavvas
Summary: This paper explores the importance of named entity recognition and intent classification, and presents the application and effectiveness of two deep learning networks for these tasks.
SIMULATION MODELLING PRACTICE AND THEORY
(2022)
Article
Medicine, General & Internal
Stavroula Almpanidou, Diamantis Almaliotis, Leonidas Karamitopoulos, Fotios Topouzis, Anastasios-Georgios Konstas, Georgios Labiris, Theodoros Dardavesis, Konstantinos N. Fountoulakis, Konstantinos Ch. Chatzisavvas, Vasileios Karampatakis
Summary: The study aimed to describe the design of the new Life for Low Vision Questionnaire (LIFE4LVQ) as a measure of daily functionality in individuals with low vision (LV), and explore its psychometric properties. The results showed that LIFE4LVQ is a reliable and valid tool that effectively measures the impact of LV on ability and independence.
JOURNAL OF CLINICAL MEDICINE
(2023)
Article
Physics, Nuclear
Ch Margaritis, P. S. Koliogiannis, A. Kanakis-Pegios, Ch C. Moustakidis
Summary: The nuclear symmetry energy is crucial in describing finite nuclei and neutron stars, especially for low baryon density. This study applies a class of nuclear models to investigate the impact of higher order energy expansions on the crust-core transition location for neutron stars. Results show that the slope parameter L affects the convergence rate of the expansion, and a universal relation is found between L and the transition density. The study also highlights the sensitivity of crustal moment of inertia to transition location and the effects on neutron star properties.
Article
Physics, Nuclear
A. Kanakis-Pegios, P. S. Koliogiannis, Ch C. Moustakidis
Article
Astronomy & Astrophysics
Ch. Margaritis, P. S. Koliogiannis, Ch. C. Moustakidis
Article
Physics, Nuclear
P. S. Koliogiannis, Ch C. Moustakidis
Article
Physics, Nuclear
L. Tsaloukidis, Ch. Margaritis, Ch. C. Moustakidis
Article
Physics, Nuclear
Ch. C. Moustakidis, T. Gaitanos, Ch. Margaritis, G. A. Lalazissis
Article
Physics, Multidisciplinary
Tinggui Chen, Baizhan Xia, Dejie Yu, Chuanxing Bi
Summary: This study proposes a gradient phononic crystal structure for enhanced acoustic sensing. By breaking the symmetry of the PC structure, topologically protected edge states are introduced, resulting in topological acoustic rainbow trapping. The robustness and enhancement properties are verified numerically and experimentally.
