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Brans-Dicke analogue of the Roberts geometry 罗伯茨几何的Brans-Dicke类比
arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-11-24 DOI: 10.1103/PHYSREVD.103.084004
Bardia H. Fahim, V. Faraoni, A. Giusti
{"title":"Brans-Dicke analogue of the Roberts geometry","authors":"Bardia H. Fahim, V. Faraoni, A. Giusti","doi":"10.1103/PHYSREVD.103.084004","DOIUrl":"https://doi.org/10.1103/PHYSREVD.103.084004","url":null,"abstract":"We report a new one-parameter family of spherically symmetric, inhomogeneous, and time-dependent solutions of the vacuum Brans-Dicke field equations which are conformal to the Roberts scalar field geometries of Einstein gravity. The new solution is spherical and time-dependent and contains a naked central singularity. We use it as a seed to generate another two-parameter family of solutions using a known symmetry of vacuum Brans-Dicke gravity.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75309317","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: 1
Growth of perturbations using Lambert W equation of state 利用Lambert W状态方程的微扰生长
arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-11-24 DOI: 10.1142/S0219887821501395
Manisha Banerjee, Sudipta Das, Abdulla Al Mamon, S. Saha, K. Bamba
{"title":"Growth of perturbations using Lambert W equation of state","authors":"Manisha Banerjee, Sudipta Das, Abdulla Al Mamon, S. Saha, K. Bamba","doi":"10.1142/S0219887821501395","DOIUrl":"https://doi.org/10.1142/S0219887821501395","url":null,"abstract":"Recently, a novel equation of state (EoS) parameter for dark energy has been introduced which deals with a special mathematical function, known as the Lambert$W$ function. In this paper, we study the effect on the growth of perturbations for the Lambert$W$ dark energy model. We perform the analysis for two different approaches. In the first case we consider the universe to be filled with two different fluid components, namely, the baryonic matter component and the Lambert$W$ dark energy component, while in the second case we consider that there is a single fluid component in the universe whose equation of state parameter is described by the Lambert$W$ function. We then compare the growth rates of Lambert$W$ model with that for a standard $Lambda$CDM model as well as the CPL model. Our results indicate that the presence of Lambert$W$ dynamical dark energy sector changes the growth rate and affects the matter fluctuations in the universe to a great extent.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81831606","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
Unruh-DeWitt detector differentiation of black holes and exotic compact objects Unruh-DeWitt探测器对黑洞和奇异致密物体的区分
arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-11-20 DOI: 10.1103/PhysRevD.103.124046
B. Holdom, R. Mann, Chen Zhang
{"title":"Unruh-DeWitt detector differentiation of black holes and exotic compact objects","authors":"B. Holdom, R. Mann, Chen Zhang","doi":"10.1103/PhysRevD.103.124046","DOIUrl":"https://doi.org/10.1103/PhysRevD.103.124046","url":null,"abstract":"We study the response of a static Unruh-DeWitt detector outside an exotic compact object (ECO) with a general reflective boundary condition in 3+1 dimensions. The horizonless ECO, whose boundary is extremely close to the would-be event horizon, acts as a black hole mimicker. We find that the response rate is notably distinct from the black hole case, even when the ECO boundary is perfectly absorbing. For a (partially) reflective ECO boundary, we find resonance structures in the response rate that depend on the different locations of the ECO boundary and those of the detector. We provide a detailed analysis in connection with the ECO's vacuum mode structure and transfer function.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80403335","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
A study on causality in f(R,ϕ,X) theory f(R， φ，X)理论中因果关系的研究
arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-11-16 DOI: 10.1142/S0217751X21500093
J. Gonccalves, A. F. Santos
{"title":"A study on causality in f(R,ϕ,X) theory","authors":"J. Gonccalves, A. F. Santos","doi":"10.1142/S0217751X21500093","DOIUrl":"https://doi.org/10.1142/S0217751X21500093","url":null,"abstract":"The $k$-essence modified $f(R)$ gravity model, i.e., $f(R,phi,X)$ theory is studied. The question of violation of causality, in the framework of Godel-type universes, is investigated in this gravitational model. Causal and non-causal solutions are allowed. A critical radius for non-causal solution is calculated. It is shown that the violation of causality depends on the content of matter.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88449737","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
Scalar perturbations of black holes in Jackiw-Teitelboim gravity Jackiw-Teitelboim引力中黑洞的标量微扰
arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-11-14 DOI: 10.1103/physrevd.103.024008
Srijit Bhattacharjee, Subhodeep Sarkar, Arpan Bhattacharyya
{"title":"Scalar perturbations of black holes in Jackiw-Teitelboim gravity","authors":"Srijit Bhattacharjee, Subhodeep Sarkar, Arpan Bhattacharyya","doi":"10.1103/physrevd.103.024008","DOIUrl":"https://doi.org/10.1103/physrevd.103.024008","url":null,"abstract":"We study linear scalar perturbations of black holes in two space-time dimensional (2D) gravity models with particular emphasis on Jackiw-Teitelboim (JT) gravity. We obtain an exact expression for the quasinormal mode frequencies for single horizon JT black holes and then verify it numerically using the Horowitz-Hubeny method. For a 2D Reissner-Nordstr\"om like solution, we find that the scalar wave equation reduces to the confluent Heun equation using which we calculate the quasi-frequencies. Finally, we consider the dimensionally reduced BTZ black hole and obtain the exterior and interior quasinormal modes. The dynamics of a scalar field near the Cauchy horizon mimics the behaviour of the same for the BTZ black hole, indicating a possible violation of strong cosmic censorship conjecture in near extreme limit. However, quantum effects seem to rescue strong cosmic censorship.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":"55 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88002539","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
Remarks on the Abraham–Minkowski problem, from the formal and from the experimental side 论亚伯拉罕-闵可夫斯基问题，从形式和实验两方面
arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-11-13 DOI: 10.1142/S0217751X21500639
I. Brevik, M. Chaichian, Ion I. Cotùaescu
{"title":"Remarks on the Abraham–Minkowski problem, from the formal and from the experimental side","authors":"I. Brevik, M. Chaichian, Ion I. Cotùaescu","doi":"10.1142/S0217751X21500639","DOIUrl":"https://doi.org/10.1142/S0217751X21500639","url":null,"abstract":"We analyze the Abraham-Minkowski problem known from classical electrodynamics from two different perspectives. First, we follow a formal approach, implying use of manifolds with curved space sections in accordance with Fermat's principle, emphasizing that the resulting covariant and contravariant components of the photon four-momentum is a property linked to the {it Minkowski} theory only. There is thus no link to the Abraham theory in that context. Next we turn to the experimental side, giving a brief account of older and newer radiation pressure experiments that clearly show how the Minkowski photon momentum is preferable under optical conditions. Under low-frequency conditions, where experimental detection of the individual oscillations predicted by the Abraham term are possible, the picture is however quite different.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90495658","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: 1
Constraining velocity-dependent Lorentz and CPT violations using lunar laser ranging 利用月球激光测距约束速度依赖的洛伦兹和CPT违规
arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-11-12 DOI: 10.1103/PHYSREVD.103.064055
A. Bourgoin, S. Bouquillon, Aurélien Hees, C. L. Poncin-Lafitte, Quentin G. Bailey, J. J. Howard, M. Angonin, G. Francou, Julien Chabé, Clément Courde, J.-M. Torre
{"title":"Constraining velocity-dependent Lorentz and \u0000CPT\u0000 violations using lunar laser ranging","authors":"A. Bourgoin, S. Bouquillon, Aurélien Hees, C. L. Poncin-Lafitte, Quentin G. Bailey, J. J. Howard, M. Angonin, G. Francou, Julien Chabé, Clément Courde, J.-M. Torre","doi":"10.1103/PHYSREVD.103.064055","DOIUrl":"https://doi.org/10.1103/PHYSREVD.103.064055","url":null,"abstract":"The possibility for Lorentz/CPT-breaking, which is motivated by unification theories, can be systematically tested within the standard-model extension framework. In the pure gravity sector, the mass dimension 5 operators produce new Lorentz and CPT-breaking terms in the 2-body equations of motion that depend on the relative velocity of the bodies. In this Letter, we report new constraints on 15 independent SME coefficients for Lorentz/CPT-violations with mass dimension 5 using lunar laser ranging. We perform a global analysis of lunar ranging data within the SME framework using more than 26,000 normal points between 1969 and 2018. We also perform a jackknife analysis in order to provide realistic estimates of the systematic uncertainties. No deviation from Lorentz/CPT symmetries is reported. In addition, when fitting simultaneously for the 15 canonical SME coefficients for Lorentz/CPT-violations, we improve up to three orders of magnitude previous post-fit constraints from radio pulsars.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87488399","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
Dynamics of test particles around a Bardeen black hole surrounded by perfect fluid dark matter 被完美流体暗物质包围的巴丁黑洞周围测试粒子的动力学
arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-11-12 DOI: 10.1103/PhysRevD.102.104062
Bakhtiyor Narzilloev, J. Rayimbaev, S. Shaymatov, A. Abdujabbarov, B. Ahmedov, C. Bambi
{"title":"Dynamics of test particles around a Bardeen black hole surrounded by perfect fluid dark matter","authors":"Bakhtiyor Narzilloev, J. Rayimbaev, S. Shaymatov, A. Abdujabbarov, B. Ahmedov, C. Bambi","doi":"10.1103/PhysRevD.102.104062","DOIUrl":"https://doi.org/10.1103/PhysRevD.102.104062","url":null,"abstract":"We study the dynamics of (i) neutral test particles, (ii) magnetically charged test particles, and (iii) test magnetic dipole around a regular Bardeen black hole surrounded by perfect fluid dark matter (PFDM). It has been shown how the magnetic charge of the black hole and the parameter of the surrounding PFDM can influence the innermost stable circular orbit (ISCO) radius of a test particle. We have found that the ISCO radius is strongly affected as a consequence of the combined effect of the magnetic charge parameter and the perfect fluid dark matter. The black hole magnetic charge parameter $g$ and the combined effect of perfect fluid dark matter can mimic the black hole rotation parameter up to $a/Mapprox 0.9$. It has been observed that the ISCO for magnetic dipole disappears at the values exceeding the calculated upper value for the magnetic interaction parameter $beta$. The upper limit decreases with the increase of both the dark matter and magnetic charge parameters. Finally, as an astrophysical application, we have analyzed degeneracy effects of spin of Kerr black holes and magnetic charge of regular Bardeen black holes for the different values of the dark matter parameter providing exactly the same value for ISCO radius of a magnetic dipole with the same value of the parameter $beta=10.2$ of the magnetar called PSR J1745-2900 orbiting around supermassive black hole Sagittarius A*.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79768793","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: 16
New cosmological solutions in hybrid metric-Palatini gravity from dynamical symmetries 从动力学对称性看混合度量-帕拉蒂尼引力的新宇宙学解
arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-11-11 DOI: 10.1142/S0217732321501005
A. Paliathanasis
{"title":"New cosmological solutions in hybrid metric-Palatini gravity from dynamical symmetries","authors":"A. Paliathanasis","doi":"10.1142/S0217732321501005","DOIUrl":"https://doi.org/10.1142/S0217732321501005","url":null,"abstract":"We investigate the existence of Liouville integrable cosmological models in hybrid metric-Palatini theory. Specifically we use the symmetry conditions for the existence of quadratic in the momentum conservation laws for the field equations as constraint conditions for the determination of the unknown functional form of the theory. The exact and analytic solutions of the integrable systems which found in this study are presented in terms of quadratics and Laurent expansions.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":"60 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81148735","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
Null geodesics in the C metric with a cosmological constant 具有宇宙常数的C度规中的零测地线
arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-11-11 DOI: 10.1103/physrevd.103.024007
Y. Lim
{"title":"Null geodesics in the \u0000C\u0000 metric with a cosmological constant","authors":"Y. Lim","doi":"10.1103/physrevd.103.024007","DOIUrl":"https://doi.org/10.1103/physrevd.103.024007","url":null,"abstract":"In this paper we study the motion of photons or massless particles in the C-metric with cosmological constant. The Hamilton--Jacobi equations are known to be completely separable, giving a Carter-like quantity $Q$ which is a constant of motion. All possible trajectories are classified according to a two-dimensional parameter space representing the particle's angular momentum and energy scaled in units of $Q$. Exact solutions are given in the C-metric coordinates in terms of Jacobi elliptic functions. Using the exact solutions, we find examples of periodic orbits on the photon surface.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86286518","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
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