arXiv - PHYS - General Relativity and Quantum Cosmology最新文献_第7页

Primordial magnetogenesis in a bouncing model with dark energy 暗能量弹跳模型中的原始磁生成

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-09 DOI: arxiv-2409.05329

Marcus V. Bomfim, Emmanuel Frion, Nelson Pinto-Neto, Sandro D. P. Vitenti

引用次数: 0

Black hole spectroscopy in environments: detectability prospects 环境中的黑洞光谱学：可探测性前景

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-09 DOI: arxiv-2409.05950

Thomas F. M. Spieksma, Vitor Cardoso, Gregorio Carullo, Matteo Della Rocca, Francisco Duque

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Testing No slip model with pulsar timing arrays: NANOGrav and IPTA 利用脉冲星定时阵列测试无滑动模型：NANOGrav 和 IPTA

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-09 DOI: arxiv-2409.05956

Mohammadreza Davari, Alireza Allahyari, Shahram Khosravi

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Occurrence of gravitational collapse in the accreting neutron stars of binary-driven hypernovae 双星驱动超新星吸积中子星发生引力坍缩的现象

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-09 DOI: arxiv-2409.05767

L. M. Becerra, F. Cipolletta, C. L. Fryer, Débora P. Menezes, Constança Providência, J. A. Rueda, R. Ruffini

{"title":"Occurrence of gravitational collapse in the accreting neutron stars of binary-driven hypernovae","authors":"L. M. Becerra, F. Cipolletta, C. L. Fryer, Débora P. Menezes, Constança Providência, J. A. Rueda, R. Ruffini","doi":"arxiv-2409.05767","DOIUrl":"https://doi.org/arxiv-2409.05767","url":null,"abstract":"The binary-driven hypernova (BdHN) model proposes long gamma-ray bursts\u0000(GRBs) originate in binaries composed of a carbon-oxygen (CO) star and a\u0000neutron star (NS) companion. The CO core collapse generates a newborn NS and a\u0000supernova that triggers the GRB by accreting onto the NSs, rapidly transferring\u0000mass and angular momentum to them. We perform three-dimensional,\u0000smoothed-particle-hydrodynamics simulations of BdHNe using up-to-date NS\u0000nuclear equations of state (EOS), with and without hyperons, and calculate the\u0000structure evolution in full general relativity. We assess the binary parameters\u0000leading either NS to the critical mass for gravitational collapse into a black\u0000hole (BH) and its occurrence time, $t_textrm{col}$. We include a non-zero\u0000angular momentum of the NSs and find that $t_textrm{col}$ ranges from a few\u0000tens of seconds to hours for decreasing NS initial angular momentum values.\u0000BdHNe I are the most compact (about five minutes orbital period), promptly form\u0000a BH and release $gtrsim 10^{52}$ erg. They form NS-BH binaries with tens of\u0000kyr merger timescale by gravitational-wave emission. BdHNe II and III do not\u0000form BHs, release $sim 10^{50}$-$10^{52}$ erg and $lesssim 10^{50}$ erg. They\u0000form NS-NS with a wider range of merger timescales. In some compact BdHNe II,\u0000either NS can become supramassive, i.e., above the critical mass of a\u0000non-rotating NS. Magnetic braking by a $10^{13}$ G field can delay BH\u0000formation, leading to BH-BH or NS-BH of tens of kyr merger timescale.","PeriodicalId":501041,"journal":{"name":"arXiv - PHYS - General Relativity and Quantum Cosmology","volume":"165 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Compartmental and Coexistence in the Dark Sector of the Universe 宇宙暗部的分隔与共存

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-09 DOI: arxiv-2409.05348

Andronikos Paliathanasis, Kevin Duffy, Amlan Halder, Amare Abebe

引用次数: 0

Neutral particle collisions near Gibbons-Maeda-Garfinkle-Horowitz-Strominger black holes after shadow observations 阴影观测后吉本斯-马埃达-加芬奇-霍罗威茨-斯特罗姆格黑洞附近的中性粒子碰撞

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-08 DOI: arxiv-2409.04990

Naoki Tsukamoto, Ryotaro Kase

{"title":"Neutral particle collisions near Gibbons-Maeda-Garfinkle-Horowitz-Strominger black holes after shadow observations","authors":"Naoki Tsukamoto, Ryotaro Kase","doi":"arxiv-2409.04990","DOIUrl":"https://doi.org/arxiv-2409.04990","url":null,"abstract":"A Gibbons-Maeda-Garfinkle-Horowitz-Strominger (GMGHS) black hole with a\u0000magnetic charge (or an electric charge) has noteworthy features that its scalar\u0000curvature near the event horizon of the black hole with the almost maximal\u0000charge can be extremely large. The large curvature, which is related with the\u0000gravity on a finite-sized object or between two points, causes high\u0000center-of-mass energy for two neutral particles near the almost maximally\u0000charged GMGHS black hole. Recently, the Event Horizon Telescope Collaboration\u0000gave the bound on the charge of black holes from the shadow and mass\u0000observations of black holes under an assumption that the diameter of observed\u0000rings are proportion to that of photon spheres. The photon sphere would be less\u0000related with the curvature, since it is determined by the behavior of one\u0000photon or one ray neither two photons nor two rays. Thus, the high-energy\u0000neutral particle collision and the black hole shadow observations would be\u0000complementary to distinguish the GMGHS black hole from other black hole\u0000solutions. In this paper, we investigate a new way to compare the\u0000center-of-mass energy for neutral particle collisions in the GMGHS spacetime\u0000and other black hole spacetimes. From the shadow observations and the mass\u0000observations under the assumptions on the effect of black hole charges, we can\u0000put constraints on the center-of-mass energy of the particles. We apply our\u0000method to shadow and mass observations of M87* and Sagittarius~A*. We find that\u0000the center-of-mass energy of neutral particles near the GMGHS black holes\u0000cannot be extremely large under the observational constraints, and conclude\u0000that the GMGHS spacetimes are hardly distinguishable from the\u0000Reissner-Nordstr\"{o}m spacetimes by the particle collisions if we apply the\u0000shadow and mass observations at $1 sigma$ probability.","PeriodicalId":501041,"journal":{"name":"arXiv - PHYS - General Relativity and Quantum Cosmology","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Landauer principle in cosmology as the link to information theory 宇宙学中的兰道尔原理与信息论的联系

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-08 DOI: arxiv-2409.05009

Sergei D. Odintsov, Tanmoy Paul, Soumitra SenGupta

引用次数: 0

Synergies in analysing binary black hole mergers: Effect of orbital eccentricity, spin-precession, and non-quadrupole modes 分析双黑洞合并的协同效应：轨道偏心率、自旋后退和非四极模式的影响

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-08 DOI: arxiv-2409.05167

Divyajyoti

{"title":"Synergies in analysing binary black hole mergers: Effect of orbital eccentricity, spin-precession, and non-quadrupole modes","authors":"Divyajyoti","doi":"arxiv-2409.05167","DOIUrl":"https://doi.org/arxiv-2409.05167","url":null,"abstract":"A gravitational wave (GW) signal carries imprints of the properties of its\u0000source. The ability to extract source properties crucially depends on our prior\u0000knowledge of the signal morphology. Even though binary black hole (BBH) mergers\u0000are the cleanest system to model in general relativity, currently, there are no\u0000waveform models which include all physical effects. This thesis focuses on\u0000three subdominant effects: orbital eccentricity, spin-precession, and\u0000non-quadrupole or higher-order modes (HMs). We study the interplay of these\u0000effects on data analysis of GW signals, highlighting the shortcomings and\u0000emphasizing the need for more advanced waveforms. For instance, we investigate\u0000whether orbital eccentricity and spin-precession can mimic each other and thus\u0000caution the GW community towards the biases that may arise due to the neglect\u0000of eccentricity and/or spins in the waveform models. Using waveforms with full\u0000spin-precession and HMs, we extend the existing spin-induced quadrupole moment\u0000(SIQM) test - a null test to distinguish BBH systems from other black hole\u0000mimickers - and show that these improved waveforms give significantly better\u0000bounds. Additionally, we quantify the parameter space where the effect of HMs\u0000is most significant and show the importance of detecting these modes in GW\u0000events for future ground-based GW detectors such as Cosmic Explorer and\u0000Einstein Telescope.","PeriodicalId":501041,"journal":{"name":"arXiv - PHYS - General Relativity and Quantum Cosmology","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Wheeler-DeWitt equation and the late gravitational collapse: effects of factor ordering and the tunneling scenario 惠勒-德威特方程和后期引力坍缩：因子排序和隧道情景的影响

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-08 DOI: arxiv-2409.05077

Davide Batic, Marek Nowakowski, Neelima Govind Kelkar

{"title":"Wheeler-DeWitt equation and the late gravitational collapse: effects of factor ordering and the tunneling scenario","authors":"Davide Batic, Marek Nowakowski, Neelima Govind Kelkar","doi":"arxiv-2409.05077","DOIUrl":"https://doi.org/arxiv-2409.05077","url":null,"abstract":"We set up the Wheeler-DeWitt (WDW) equation for late gravitational collapse.\u0000The fact that the gravitational collapse and the expanding/ collapsing universe\u0000can be described within the realm of the Robertson-Walker metric renders the\u0000corresponding WDW equation for collapsing matter a timeless Schr\"odinger\u0000equation. We explore the consequences of such an equation and find the density\u0000to be quantized in terms of the Planck density. Apart from that, the wave\u0000function as a solution of the WDW equation shows that the initial singularity\u0000is avoided. We concentrate on different factor orderings in the kinetic term of\u0000the equation and show how after splitting off an exponential ansatz, new\u0000polynomials entering the solution can be constructed. This enables us to\u0000conclude that the factor ordering changes the details of the solution and\u0000interpretation, but overall on a qualitative level the results remain the same.\u0000We also probe into the effects of a positive cosmological constant. It offers\u0000the possibility of a tunneling scenario at the cosmological horizon.","PeriodicalId":501041,"journal":{"name":"arXiv - PHYS - General Relativity and Quantum Cosmology","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Dispersion Relation of Massive Photons in Plasma: A Comment on "Bounding the Photon Mass with Ultrawide Bandwidth Pulsar Timing Data and Dedispersed Pulses of Fast Radio Bursts" 等离子体中大质量光子的色散关系：关于 "用超宽带宽脉冲星定时数据和快速射电暴的分散脉冲限定光子质量 "的评论

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-07 DOI: arxiv-2409.04672

Bao Wang, Jun-Jie Wei

引用次数: 0