arXiv: General Relativity and Quantum Cosmology最新文献_第9页

Thermodynamics of (2+1)-dimensional Coulomb-like black holes from nonlinear electrodynamics with a traceless energy momentum tensor 无迹能动量张量非线性电动力学下(2+1)维类库仑黑洞的热力学

arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-10-13 DOI: 10.1103/PHYSREVD.103.024047

M. Cataldo, P. González, J. Saavedra, Yerko Vásquez, Bin Wang

引用次数: 3

Black holes in the long-range limit of torsion bigravity 黑洞在扭转引力的长程极限

arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-10-12 DOI: 10.1103/physrevd.102.124007

V. Nikiforova

{"title":"Black holes in the long-range limit of torsion bigravity","authors":"V. Nikiforova","doi":"10.1103/physrevd.102.124007","DOIUrl":"https://doi.org/10.1103/physrevd.102.124007","url":null,"abstract":"We continue the study of spherically symmetric black hole solutions in torsion bigravity, a class of Einstein-Cartan-type gravity theories involving, besides a metric, a massive propagating torsion field. In the infinite-range limit, these theories admit asymptotically flat black hole solutions related to the presence of attractive fixed points in the asymptotic radial evolution of the metric and the torsion. We discuss these fixed points, and the way they are approached at large radii. Several phenomenological aspects of asymptotically flat torsion-hairy black holes are discussed: (i) location of the light ring and of the shadow; (ii) correction to the redshift of orbiting stars; and (iii) modification of the periastron precession of orbiting stars. By comparing the observable properties of torsion-hairy black holes to existing observational data on supermassive black holes obtained by the Event Horizon Telescope collaboration, and by the GRAVITY collaboration, we derive constraints on the theory parameters of torsion bigravity. The strongest constraint is found to come from the recent measurement of the periastron precession of the star S2 orbiting the Galactic-center massive black hole [Astron. Astrophys. 636, L5 (2020)], and to be a thousand times more stringent than solar-system gravitational tests.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86505405","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: 2

Dynamical bar-mode instability in spinning bosonic stars 自旋玻色子恒星的动态棒模不稳定性

arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-10-12 DOI: 10.1103/physrevd.102.124009

F. Di Giovanni, N. Sanchis-Gual, P. Cerdá-Durán, M. Zilhão, C. Herdeiro, J. Font, E. Radu

{"title":"Dynamical bar-mode instability in spinning bosonic stars","authors":"F. Di Giovanni, N. Sanchis-Gual, P. Cerdá-Durán, M. Zilhão, C. Herdeiro, J. Font, E. Radu","doi":"10.1103/physrevd.102.124009","DOIUrl":"https://doi.org/10.1103/physrevd.102.124009","url":null,"abstract":"Spinning bosonic stars (SBSs) can form from the gravitational collapse of a dilute cloud of scalar/Proca particles with non-zero angular momentum. In a recent work we found that the scalar stars are transient due to a non-axisymmetric instability which triggers the loss of angular momentum. We further study the dynamical formation of SBSs using 3-dimensional numerical-relativity simulations of the Einstein-(massive, complex)Klein-Gordon system and of the Einstein-(complex)Proca system. We incorporate a quartic self-interaction potential in the scalar case to gauge its effect on the instability; we investigate (m=2) Proca stars to assess their stability; we attempt to relate the instability of SBSs to the growth rate of azimuthal density modes and the existence of a corotation point. We show that: the self-interaction potential can only delay the instability in scalar SBSs; m=2 Proca stars always migrate to the stable m=1 spheroidal family; unstable m=2 Proca stars and m=1 scalar boson stars exhibit a corotation point. This establishes a parallelism with rotating neutron stars affected by dynamical bar-mode instabilities. We compute the gravitational waves (GWs) emitted and investigate the detectability of the waveforms comparing the characteristic strain of the signal with the sensitivity curves of a variety of detectors, computing the signal-to-noise ratio. By assuming that the characteristic damping timescale of the bar-like deformation in SBSs is only set by GWs emission and not by viscosity (unlike in neutron stars), we find that the post-collapse emission could be orders of magnitude more energetic than that of the bar-mode instability itself. Our results indicate that GW observations of SBSs might be within the reach of future experiments, offering a potential means to establish the existence of such stars and to place tight constraints on the mass of the bosonic particle.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73047236","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: 21

Towards the routine use of subdominant harmonics in gravitational-wave inference: Reanalysis of GW190412 with generation X waveform models 次谐波在引力波推断中的常规应用:用X代波形模型对GW190412的再分析

arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-10-12 DOI: 10.1103/PHYSREVD.103.024029

M. Colleoni, M. Mateu-Lucena, H'ector Estell'es, C. García-Quirós, D. Keitel, G. Pratten, A. Ramos-Buades, S. Husa

{"title":"Towards the routine use of subdominant harmonics in gravitational-wave inference: Reanalysis of GW190412 with generation X waveform models","authors":"M. Colleoni, M. Mateu-Lucena, H'ector Estell'es, C. García-Quirós, D. Keitel, G. Pratten, A. Ramos-Buades, S. Husa","doi":"10.1103/PHYSREVD.103.024029","DOIUrl":"https://doi.org/10.1103/PHYSREVD.103.024029","url":null,"abstract":"We re-analyse the gravitational-wave event GW190412 with state-of-the-art phenomenological waveform models. This event, which has been associated with a black hole merger, is interesting due to the significant contribution from subdominant harmonics. We use both frequency-domain and time-domain waveform models. The PhenomX waveform models constitute the fourth generation of frequency-domain phenomenological waveforms for black hole binary coalescence; they have more recently been complemented by the time-domain PhenomT models, which open up new strategies to model precession and eccentricity, and to perform tests of general relativity with the phenomenological waveforms approach. Both PhenomX and PhenomT have been constructed with similar techniques and accuracy goals, and due to their computational efficiency this \"generation X\" model family allows the routine use of subdominant spherical harmonics in Bayesian inference. We show the good agreement between these and other state-of-the-art waveform models for GW190412, and discuss the improvements over the previous generation of phenomenological waveform models. We also discuss practical aspects of Bayesian inference such as run convergence, variations of sampling parameters, and computational cost.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87476724","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: 10

Static spacetimes haunted by a phantom scalar field. I. Classification and global structure in the massless case 被虚标量场困扰的静态时空。1 .无质量情况下的分类和全局结构

arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-10-11 DOI: 10.1103/PHYSREVD.103.024003

Cristián Martínez, Masato Nozawa

{"title":"Static spacetimes haunted by a phantom scalar field. I. Classification and global structure in the massless case","authors":"Cristián Martínez, Masato Nozawa","doi":"10.1103/PHYSREVD.103.024003","DOIUrl":"https://doi.org/10.1103/PHYSREVD.103.024003","url":null,"abstract":"We discuss various novel features of $n(ge 4)$-dimensional spacetimes sourced by a massless (non-)phantom scalar field in general relativity. Assuming that the metric is a warped product of static two-dimensional Lorentzian spacetime and an $(n-2)$-dimensional Einstein space $K^{n-2}$ with curvature $k=0, pm 1$, and that the scalar field depends only on the radial variable, we present a complete classification of static solutions for both signs of kinetic term. Contrary to the case with a non-phantom scalar field, the Fisher solution is not unique, and there exist two additional metrics corresponding to the generalizations of the Ellis-Gibbons solution and the Ellis-Bronnikov solution. We explore the maximal extension of these solutions in detail by the analysis of null/spacelike geodesics and singularity. For the phantom Fisher and Ellis-Gibbons solutions, we find that there inevitably appear parallelly propagated (p.p) curvature singularities in the parameter region where there are no scalar curvature singularities. Interestingly, the areal radius blows up at these p.p curvature singularities, which are nevertheless accessible within a finite affine time along the radial null geodesics. It follows that only the Ellis-Bronnikov solution describes a regular wormhole in the two-sided asymptotically flat spacetime. Using the general transformation relating the Einstein and Jordan frames, we also present a complete classification of solutions with the same symmetry coupled to a conformal scalar field. Additionally, by solving the field equations in the Jordan frame, we prove that this classification is genuinely complete.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88368071","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: 12

Entanglement and decoherence of massive particles due to gravity 重力引起的大质量粒子的纠缠和退相干

arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-10-11 DOI: 10.1103/PHYSREVD.103.026017

D. Miki, Akira Matsumura, Kazuhiro Yamamoto

引用次数: 32

A Teleparallel Type Theory for Massless Spin 2 Fields 无质量自旋2场的遥平行型理论

arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-10-10 DOI: 10.20944/preprints202010.0382.v1

J. Maluf, S. Ulhoa

引用次数: 1

Novel exact magnetic black hole solution in four-dimensional extended scalar-tensor-Gauss-Bonnet theory 四维扩展标量-张量-高斯-博内理论中新的精确磁黑洞解

arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-10-10 DOI: 10.1103/physrevd.102.104038

Pedro Cañate, S. Bergliaffa

引用次数: 13

Probing Fundamental Physics with Gravitational Waves 用引力波探索基础物理学

arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-10-09 DOI: 10.18130/v3-pxdw-2144

Zack Carson

{"title":"Probing Fundamental Physics with Gravitational Waves","authors":"Zack Carson","doi":"10.18130/v3-pxdw-2144","DOIUrl":"https://doi.org/10.18130/v3-pxdw-2144","url":null,"abstract":"The explosive coalescence of two black holes 1.3 billion light years away has for the very first time allowed us to peer into the extreme gravity region of spacetime surrounding these events. With these maximally compact objects reaching speeds up to 60% the speed of light, collision events such as these create harsh spacetime environments where the fields are strong, non-linear, and highly dynamical -- a place yet un-probed in human history. On September 14, 2015, the iconic chirp signal from such an event was registered simultaneously by both of the Laser Interferometer Gravitational-Wave Observatory (LIGO) detectors -- by an unparalleled feat of modern engineering. Dubbed \"GW150914\", this gravitational wave event paved the way for an entirely new observing window into the universe, providing for the unique opportunity to probe fundamental physics from an entirely new viewpoint. Since this historic event, the LIGO/Virgo collaboration (LVC) has further identified ten additional gravitational wave signals in its first two observing runs, composed of a myriad of different events. Important among these new cataloged detections is GW170817, the first detection of gravitational waves from the merger of two neutron stars, giving way to new insight into the supranuclear physics resident within. \u0000This thesis explores this new unique opportunity to harness the information encoded within gravitational waves in regards to their source whence they came, to probe fundamental physics from an entirely new perspective. Part A focuses on probing nuclear physics by way of the tidal information encoded within gravitational waves from binary neutron star mergers. Part B focuses on testing general relativity from such events by way of the remnants of such spacetime encoded within the gravitational wave signal.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86300921","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: 3

Improved analysis of GW190412 with a precessing numerical relativity surrogate waveform model 基于进动数值相对性替代波形模型的GW190412改进分析

arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-10-09 DOI: 10.1103/PhysRevD.103.104027

Tousif Islam, Scott E. Field, C. Haster, Rory J. E. Smith

{"title":"Improved analysis of GW190412 with a precessing numerical relativity surrogate waveform model","authors":"Tousif Islam, Scott E. Field, C. Haster, Rory J. E. Smith","doi":"10.1103/PhysRevD.103.104027","DOIUrl":"https://doi.org/10.1103/PhysRevD.103.104027","url":null,"abstract":"The recent observation of GW190412, the first high-mass ratio binary black-hole (BBH) merger, by the LIGO-Virgo Collaboration (LVC) provides a unique opportunity to probe the impact of subdominant harmonics and precession effects encoded in a gravitational wave signal. We present refined estimates of source parameters for GW190412 using texttt{NRSur7dq4}, a recently developed numerical relativity waveform surrogate model that includes all $ell leq 4$ spin-weighted spherical harmonic modes as well as the full physical effects of precession. We compare our results with two different variants of phenomenological precessing BBH waveform models, texttt{IMRPhenomPv3HM} and texttt{IMRPhenomXPHM}, as well as to the LVC results. Our results are broadly in agreement with texttt{IMRPhenomXPHM} results and the reported LVC analysis compiled with the texttt{SEOBNRv4PHM} waveform model, but in tension with texttt{IMRPhenomPv3HM}. Using the texttt{NRSur7dq4} model, we provide a tighter constraint on the mass-ratio ($0.26^{+0.07}_{-0.05}$) as compared to the LVC estimate of $0.28^{+0.13}_{-0.07}$ (both reported as median values withs 90% credible intervals). We infer the luminosity distance to be $sim 4 %$ larger than the estimated values with phenomenological models and the quoted LVC result, constrain the binary to be more face-on, and find a broader posterior for the spin precession parameter. We further find that even though $ell=4$ harmonic modes have negligible signal-to-noise ratio, omission of these modes will influence the estimated posterior distribution of several source parameters including chirp mass, effective inspiral spin, luminosity distance, and inclination. We also find that commonly used model approximations, such as neglecting the asymmetric modes (excited during precession), have negligible impact on parameter recovery for moderate SNR-events similar to GW190412.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76619699","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: 7