arXiv - PHYS - General Relativity and Quantum Cosmology最新文献_第2页

An Effective Model for the Quantum Schwarzschild Black Hole: Weak Deflection Angle, Quasinormal Modes and Bounding of Greybody Factor 量子施瓦兹柴尔德黑洞的有效模型：弱偏转角、准正模和灰体因子边界

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-17 DOI: arxiv-2409.10930

Ángel Rincón, Ali Övgün, Reggie C. Pantig

{"title":"An Effective Model for the Quantum Schwarzschild Black Hole: Weak Deflection Angle, Quasinormal Modes and Bounding of Greybody Factor","authors":"Ángel Rincón, Ali Övgün, Reggie C. Pantig","doi":"arxiv-2409.10930","DOIUrl":"https://doi.org/arxiv-2409.10930","url":null,"abstract":"In this paper, we thoroughly explore two crucial aspects of a quantum\u0000Schwarzschild black solution within four-dimensional space-time: i) the weak\u0000deflection angle, ii) the rigorous greybody factor and, iii) the Dirac\u0000quasinormal modes}. Our investigation involves employing the Gauss-Bonnet\u0000theorem to precisely compute the deflection angle and establishing its\u0000correlation with the Einstein ring. Additionally, we derive the rigorous bounds\u0000for greybody factors through the utilization of general bounds for reflection\u0000and transmission coefficients in the context of Schrodinger-like\u0000one-dimensional potential scattering. We also compute the corresponding Dirac\u0000quasinormal modes using the WKB approximation. We reduce the Dirac equation to\u0000a Schrodinger-like differential equation and solve it with appropriate boundary\u0000conditions to obtain the quasinormal frequencies. To visually underscore the\u0000quantum effect, we present figures that illustrate the impact of varying the\u0000parameter $r_0$, or more specifically, in terms of the parameter $alpha$. This\u0000comprehensive examination enhances our understanding of the quantum\u0000characteristics inherent in the Schwarzschild black solution, shedding light on\u0000both the deflection angle and greybody factors in a four-dimensional space-time\u0000framework.","PeriodicalId":501041,"journal":{"name":"arXiv - PHYS - General Relativity and Quantum Cosmology","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142250732","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

Hierarchical searches for subsolar-mass binaries and the third-generation gravitational wave detector era 亚太阳质量双星的分层搜索和第三代引力波探测器时代

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-17 DOI: arxiv-2409.11317

Kanchan Soni, Alexander H. Nitz

{"title":"Hierarchical searches for subsolar-mass binaries and the third-generation gravitational wave detector era","authors":"Kanchan Soni, Alexander H. Nitz","doi":"arxiv-2409.11317","DOIUrl":"https://doi.org/arxiv-2409.11317","url":null,"abstract":"The detection of gravitational waves (GWs) from coalescing compact binaries\u0000has become routine with ground-based detectors like LIGO and Virgo. However,\u0000beyond standard sources such as binary black holes and neutron stars and\u0000neutron star black holes, no exotic sources revealing new physics have been\u0000discovered. Detecting ultra-compact objects, such as subsolar mass (SSM)\u0000compact objects, offers a promising opportunity to explore diverse\u0000astrophysical populations. However, searching for these objects using standard\u0000matched-filtering techniques is computationally intensive due to the dense\u0000parameter space involved. This increasing computational demand not only\u0000challenges current search methodologies but also poses significant obstacles\u0000for third-generation (3G) ground-based GW detectors. In the 3G era, signals may\u0000last tens of minutes, and detection rates could reach one per minute, requiring\u0000efficient search strategies to manage the computational load of long-duration\u0000signals. In this paper, we demonstrate a hierarchical search strategy designed\u0000to address the challenges of searching for long-duration signals, such as those\u0000from SSM compact binaries, and the anticipated issues with 3G detectors. We\u0000show that by adopting optimization techniques in a two-stage hierarchical\u0000approach, we can efficiently search for the SSM compact object in the current\u0000LIGO detectors. Our preliminary results show that conducting matched filtering\u0000at a lower frequency of 35 Hz improves the signal-to-noise ratio by 6% and\u0000enhances the detection volume by 10-20%, compared to the standard two-detector\u0000PyCBC search. This improvement is achieved while reducing computational costs\u0000by a factor of 2.5.","PeriodicalId":501041,"journal":{"name":"arXiv - PHYS - General Relativity and Quantum Cosmology","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142250720","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

On massive particle surfaces, partial umbilicity and circular orbits 关于大质量粒子表面、部分脐带和圆形轨道

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-16 DOI: arxiv-2409.10789

Boris Bermúdez-Cárdenas, Oscar Lasso Andino

{"title":"On massive particle surfaces, partial umbilicity and circular orbits","authors":"Boris Bermúdez-Cárdenas, Oscar Lasso Andino","doi":"arxiv-2409.10789","DOIUrl":"https://doi.org/arxiv-2409.10789","url":null,"abstract":"The generalization of photon spheres by considering the trajectories of\u0000massive particles leads to the definition of Massive Particle Surfaces (MPS).\u0000These surfaces are built with the trajectories of massive particles, and have a\u0000partial umbilicity property. Using the geodesic and Gaussian curvature of the\u0000Jacobi metric (a Riemannian metric) we derive a general condition for the\u0000existence of a Massive Particle Surface defined for an asymptotically flat\u0000spacetime metric. Our results can be applied to the worldlines of charged\u0000massive particle surfaces. We provide a simple characterization for timelike\u0000and null trajectories using a Riemannian geometric approach. We are able to\u0000recover the results for the existence of Light Rings (LR's) and timelike\u0000circular orbits (TCO's). We show how an event horizon gets characterized using\u0000the curvatures of a Riemannian metric. We discuss several examples, where we\u0000derive conditions for the existence of photon sphere and a massive particle\u0000surface. We calculate the radius of the photon sphere and the radius of the\u0000Innermost Stable Circular Orbits (ISCO).","PeriodicalId":501041,"journal":{"name":"arXiv - PHYS - General Relativity and Quantum Cosmology","volume":"53 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142250724","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

Relativistic elastic membranes: rotating disks and Dyson spheres 相对论弹性膜：旋转盘和戴森球

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-16 DOI: arxiv-2409.10602

Paulo Mourão, José Natário, Rodrigo Vicente

引用次数: 0

Initial data for a deformed isolated horizon 变形孤立地平线的初始数据

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-16 DOI: arxiv-2409.10423

Aleš Flandera, David Kofroň, Tomáš Ledvinka

引用次数: 0

Galactic Compton Wavelengths in $f(R)$ Screening Theories 在 $f(R)$ 屏蔽理论中的银河康普顿波长

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-16 DOI: arxiv-2409.10623

Bradley March, Clare Burrage, Aneesh P. Naik

引用次数: 0

An improved IMR model for BBHs on elliptical orbits 椭圆轨道上 BBHs 的改进 IMR 模型

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-16 DOI: arxiv-2409.10672

Pratul Manna, Tamal RoyChowdhury, Chandra Kant Mishra

{"title":"An improved IMR model for BBHs on elliptical orbits","authors":"Pratul Manna, Tamal RoyChowdhury, Chandra Kant Mishra","doi":"arxiv-2409.10672","DOIUrl":"https://doi.org/arxiv-2409.10672","url":null,"abstract":"Gravitational waveforms capturing binary's evolution through the\u0000early-inspiral phase play a critical role in extracting orbital features that\u0000nearly disappear during the late-inspiral and subsequent merger phase due to\u0000radiation reaction forces; for instance, the effect of orbital eccentricity.\u0000Phenomenological approaches that model compact binary mergers rely heavily on\u0000combining inputs from both analytical and numerical approaches to reduce the\u0000computational cost of generating templates for data analysis purposes. In a\u0000recent work, Chattaraj et al., Phys. Rev. D 106, 124008 (2022)\u0000arXiv:2204.02377(gr-qc), we demonstrated construction of a dominant\u0000(quadrupole) mode inspiral-merger-ringdown (IMR) model for binary black holes\u0000(BBHs) on elliptical orbits. The model was constructed in time-domain and is\u0000fully analytical. The current work is an attempt to improve this model by\u0000making a few important changes in our approach. The most significant of those\u0000involves identifying initial values of orbital parameters with which the\u0000inspiral part of the model is evolved. While the ingredients remain the same as\u0000in arXiv:2204.02377(gr-qc), resulting waveforms at each stage seem to have\u0000improved as a consequence of new considerations proposed here. The updated\u0000model is validated also against an independent waveform family resulting\u0000overlaps better than $sim 96.5%$ within the calibrated range of binary\u0000parameters. Further, we use the prescription of the dominant mode model\u0000presented here to provide an alternate (but equivalent) model for the\u0000(dominant) quadrupole mode and extend the same to a model including the effect\u0000of selected non-quadrupole modes. Finally, while this model assumes\u0000non-spinning components, we show that this could also be used for mildly\u0000spinning systems with component spins (anti-) aligned w.r.t the orbital angular\u0000momentum.","PeriodicalId":501041,"journal":{"name":"arXiv - PHYS - General Relativity and Quantum Cosmology","volume":"100 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142250788","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

General-relativistic resistive-magnetohydrodynamics simulations of self-consistent magnetized rotating neutron stars 自洽磁旋转中子星的广义相对论电阻磁流体动力学模拟

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-16 DOI: arxiv-2409.10508

Patrick Chi-Kit Cheong, Antonios Tsokaros, Milton Ruiz, Fabrizio Venturi, Juno Chun Lung Chan, Anson Ka Long Yip, Koji Uryu

引用次数: 0

Performance-Portable Numerical Relativity with AthenaK 利用 AthenaK 实现性能便携的数值相对论

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-16 DOI: arxiv-2409.10383

Hengrui Zhu, Jacob Fields, Francesco Zappa, David Radice, James Stone, Alireza Rashti, William Cook, Sebastiano Bernuzzi, Boris Daszuta

{"title":"Performance-Portable Numerical Relativity with AthenaK","authors":"Hengrui Zhu, Jacob Fields, Francesco Zappa, David Radice, James Stone, Alireza Rashti, William Cook, Sebastiano Bernuzzi, Boris Daszuta","doi":"arxiv-2409.10383","DOIUrl":"https://doi.org/arxiv-2409.10383","url":null,"abstract":"We present the numerical relativity module within AthenaK, an open source\u0000performance-portable astrophysics code designed for exascale computing\u0000applications. This module employs the Z4c formulation to solve the Einstein\u0000equations. We demonstrate its accuracy through a series of standard numerical\u0000relativity tests, including convergence of the gravitational waveform from\u0000binary black hole coalescence. Furthermore, we conduct scaling tests on OLCF\u0000Frontier and NERSC Perlmutter, where AthenaK exhibits excellent weak scaling\u0000efficiency of 80% on up to 65,536 AMD MI250X GPUs on Frontier (relative to 4\u0000GPUs) and strong scaling efficiencies of 84% and 77% on AMD MI250X and NVIDIA\u0000A100 GPUs on Frontier and Perlmutter respectively. Additionally, we observe a\u0000significant performance boost, with two orders of magnitude speedup ($gtrsim\u0000200times$) on a GPU compared to a single CPU core, affirming that AthenaK is\u0000well-suited for exascale computing, thereby expanding the potential for\u0000breakthroughs in numerical relativity research.","PeriodicalId":501041,"journal":{"name":"arXiv - PHYS - General Relativity and Quantum Cosmology","volume":"52 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142250730","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

Performance-Portable Binary Neutron Star Mergers with AthenaK 利用 AthenaK 实现性能便携式双中子星合并

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-16 DOI: arxiv-2409.10384

Jacob Fields, Hengrui Zhu, David Radice, James M. Stone, William Cook, Sebastiano Bernuzzi, Boris Daszuta

{"title":"Performance-Portable Binary Neutron Star Mergers with AthenaK","authors":"Jacob Fields, Hengrui Zhu, David Radice, James M. Stone, William Cook, Sebastiano Bernuzzi, Boris Daszuta","doi":"arxiv-2409.10384","DOIUrl":"https://doi.org/arxiv-2409.10384","url":null,"abstract":"We introduce an extension to the AthenaK code for general-relativistic\u0000magnetohydrodynamics (GRMHD) in dynamical spacetimes using a 3+1 conservative\u0000Eulerian formulation. Like the fixed-spacetime GRMHD solver, we use standard\u0000finite-volume methods to evolve the fluid and a constrained transport scheme to\u0000preserve the divergence-free constraint for the magnetic field. We also utilize\u0000a first-order flux correction (FOFC) scheme to reduce the need for an\u0000artificial atmosphere and optionally enforce a maximum principle to improve\u0000robustness. We demonstrate the accuracy of AthenaK using a set of standard\u0000tests in flat and curved spacetimes. Using a SANE accretion disk around a Kerr\u0000black hole, we compare the new solver to the existing solver for stationary\u0000spacetimes using the so-called \"HARM-like\" formulation. We find that both\u0000formulations converge to similar results. We also include the first published\u0000binary neutron star (BNS) mergers performed on graphical processing units\u0000(GPUs). Thanks to the FOFC scheme, our BNS mergers maintain a relative error of\u0000$mathcal{O}(10^{-11})$ or better in baryon mass conservation up to collapse.\u0000Finally, we perform scaling tests of AthenaK on OLCF Frontier, where we show\u0000excellent weak scaling of $geq 80%$ efficiency up to 32768 GPUs and $74%$ up\u0000to 65536 GPUs for a GRMHD problem in dynamical spacetimes with six levels of\u0000mesh refinement. AthenaK achieves an order-of-magnitude speedup using GPUs\u0000compared to CPUs, demonstrating that it is suitable for performing numerical\u0000relativity problems on modern exascale resources.","PeriodicalId":501041,"journal":{"name":"arXiv - PHYS - General Relativity and Quantum Cosmology","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142250784","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