arXiv: General Relativity and Quantum Cosmology最新文献_第5页

A broadband signal recycling scheme for saturating the quantum limit from optical losses 一种宽带信号回收方案，使量子极限从光损耗中饱和

arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-11-09 DOI: 10.20944/preprints202011.0405.v1

Teng Zhang, J. Bentley, H. Miao

引用次数: 2

The matter Lagrangian of an ideal fluid 理想流体的拉格朗日量

arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-11-09 DOI: 10.1142/s0219887821500596

S. Mendoza, S. Silva

引用次数: 7

Dynamics of primordial fields in quantum cosmological spacetimes 量子宇宙学时空中原始场的动力学

arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-11-06 DOI: 10.1103/PHYSREVD.103.083529

P. Małkiewicz, Artur Miroszewski

{"title":"Dynamics of primordial fields in quantum cosmological spacetimes","authors":"P. Małkiewicz, Artur Miroszewski","doi":"10.1103/PHYSREVD.103.083529","DOIUrl":"https://doi.org/10.1103/PHYSREVD.103.083529","url":null,"abstract":"Quantum cosmological models are commonly described by means of semiclassical approximations in which a smooth evolution of the expectation values of geometry operators replaces the classical and singular dynamics. The advantage of such descriptions is that they are relatively simple and display the classical behavior for large universes. However, they may \"smooth out\" an important inner structure to include which a more nuanced treatment is needed. The purpose of the present work is to investigate this inner structure and its influence on primordial gravitational waves. To this end we quantize a model of the Friedmann-Lemaitre-Robertson-Walker universe filled with a \"linear\" barotropic cosmological fluid and with gravitational waves. The quantization yields an equation of motion for the Fourier modes of gravitational radiation, which is a quantum extension to the usual parametric oscillator equation for gravitational waves propagating in an expanding universe. The two quantum effects from the cosmological background that enter the enhanced equation of motion are (i) a repulsive potential resolving the big bang singularity and replacing it with a Big Bounce; and (ii) uncertainties in the numerical values for the background spacetime dynamical variables. First we study the former effect and its consequences for the primordial amplitude spectrum and carefully discuss the physical scales and parameters of the model. Next we investigate the latter effect, in particular the extent to which it may affect the primordial amplitude of gravitational waves.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82508467","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: 4

Relativistic effective action of dynamical gravitomagnetic tides for slowly rotating neutron stars 慢旋转中子星引力潮汐的相对论有效作用

arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-11-06 DOI: 10.1103/PHYSREVRESEARCH.3.013147

Pawan Kumar Gupta, J. Steinhoff, T. Hinderer

{"title":"Relativistic effective action of dynamical gravitomagnetic tides for slowly rotating neutron stars","authors":"Pawan Kumar Gupta, J. Steinhoff, T. Hinderer","doi":"10.1103/PHYSREVRESEARCH.3.013147","DOIUrl":"https://doi.org/10.1103/PHYSREVRESEARCH.3.013147","url":null,"abstract":"Gravitomagnetic quasi-normal modes of neutron stars are resonantly excited by tidal effects during a binary inspiral, leading to a potentially measurable effect in the gravitational-wave signal. We take an important step towards incorporating these effects in waveform models by developing a relativistic effective action for the gravitomagnetic dynamics that clarifies a number of subtleties. Working in the slow-rotation limit, we first consider the post-Newtonian approximation and explicitly derive the effective action from the equations of motion. We demonstrate that this formulation opens a way to compute mode frequencies, yields insights into the relevant matter variables, and elucidates the role of a shift symmetry of the fluid properties under a displacement of the gravitomagnetic mode amplitudes. We then construct a fully relativistic action based on the symmetries and a power counting scheme. This action involves four coupling coefficients that depend on the internal structure of the neutron star and characterize the key matter parameters imprinted in the gravitational waves. We show that, after fixing one of the coefficients by normalization, the other three directly involve the two kinds of gravitomagnetic Love numbers (static and irrotational), and the mode frequencies. We discuss several interesting features and dynamical consequences of this action, and analyze the frequency-domain response function (the frequency-dependent ratio between the induced flux quadrupole and the external gravitomagnetic field), and a corresponding Love operator representing the time-domain response. Our results provide the foundation for deriving precision predictions of gravitomagnetic effects, and the nuclear physics they encode, for gravitational-wave astronomy.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74243335","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: 14

Universal Properties of Light Rings for Stationary Axisymmetric Spacetimes. 静止轴对称时空中光环的普适性。

arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-11-04 DOI: 10.1103/PhysRevD.103.104031

Minyong Guo, Sijie Gao

引用次数: 35

Gravitomagnetic resonance in the field of a gravitational wave 引力波场中的重力磁共振

arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-11-02 DOI: 10.1103/PhysRevD.102.101501

M. Ruggiero, A. Ortolan

引用次数: 10

N=1 Supergravity with loop quantum gravity methods and quantization of the SUSY constraint N=1环量子引力方法的超引力和SUSY约束的量子化

arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-10-30 DOI: 10.1103/PHYSREVD.103.046010

K. Eder, H. Sahlmann

引用次数: 4

Tidal Love numbers of Kerr black holes 克尔黑洞的潮汐爱数

arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-10-29 DOI: 10.1103/PHYSREVD.103.084021

A. Le Tiec, M. Casals, Edgardo Franzin

{"title":"Tidal Love numbers of Kerr black holes","authors":"A. Le Tiec, M. Casals, Edgardo Franzin","doi":"10.1103/PHYSREVD.103.084021","DOIUrl":"https://doi.org/10.1103/PHYSREVD.103.084021","url":null,"abstract":"The open question of whether a Kerr black hole can become tidally deformed or not has profound implications for fundamental physics and gravitational-wave astronomy. We consider a Kerr black hole embedded in a weak and slowly varying, but otherwise arbitrary, multipolar tidal environment. By solving the static Teukolsky equation for the gauge-invariant Weyl scalar $psi_0$, and by reconstructing the corresponding metric perturbation in an ingoing radiation gauge, for a general harmonic index $ell$, we compute the linear response of a Kerr black hole to the tidal field. This linear response vanishes identically for a Schwarzschild black hole and for an axisymmetric perturbation of a spinning black hole. For a nonaxisymmetric perturbation of a spinning black hole, however, the linear response does not vanish, and it contributes to the Geroch-Hansen multipole moments of the perturbed Kerr geometry. As an application, we compute explicitly the rotational black hole tidal Love numbers that couple the induced quadrupole moments to the quadrupolar tidal fields, to linear order in the black hole spin, and we introduce the corresponding notion of tidal Love tensor. Finally, we show that those induced quadrupole moments are closely related to the well-known physical phenomenon of tidal torquing of a spinning body interacting with a tidal gravitational environment.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":"85 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83900420","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: 49

Quantum Scattering Process and Information Transfer Out of a Black Hole 量子散射过程与黑洞外的信息传递

arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-10-29 DOI: 10.5506/APhysPolB.52.805

V. Emelyanov, F. Klinkhamer

引用次数: 0

Algorithm for time-delay interferometry numerical simulation and sensitivity investigation 延时干涉测量算法的数值模拟及灵敏度研究

arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-10-29 DOI: 10.1103/PhysRevD.103.122006

Gang Wang, W. Ni, W. Han, C. Qiao

{"title":"Algorithm for time-delay interferometry numerical simulation and sensitivity investigation","authors":"Gang Wang, W. Ni, W. Han, C. Qiao","doi":"10.1103/PhysRevD.103.122006","DOIUrl":"https://doi.org/10.1103/PhysRevD.103.122006","url":null,"abstract":"In this work, we introduce a generic algorithm to numerically determine the time delays and spacecraft positions for a time-delay interferometry (TDI) channel in the dynamical case, and streamline the calculations by implementing an SC layout-time delay diagram. We select 11 second-generation TDI channels constructed from four approaches and evaluate their performances including gravitational wave responses, noise levels, and averaged sensitivities under a numerical LISA orbit. The results show that the interference paths of selected TDI channels are well matched and the laser frequency noise should be suppressed under the secondary noise. The channels show various sensitivities in the range of [0.1 mHz, 0.3 Hz], and the major differences appear in the frequency region lower than 20 mHz. The optimal channel A$_2$ or E$_2$ combined from second-generation Michelson TDI channels (X$_1$, X$_2$, and X$_3$) achieves the best sensitivity in the selected channels for the frequency lower than 50 mHz, while the Sagnac $alpha_1$ channel shows the worse sensitivity. Multiple channels show better sensitivities at some characteristic frequencies compared to the fiducial X$_1$ channel. The Michelson-type channels would have identical sensitivities considering noise level changes with the GW response. The joint $mathrm{A_2+E_2+T_2}$ observation not only enhances the sensitivity of the X$_1$ channel by a factor of $sqrt{2}$ to 2 but also improves the capacity of sky coverage.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90771657","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: 6