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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
Toward Nonlocal Electrodynamics of Accelerated Systems 加速系统的非局部电动力学研究
arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-11-18 DOI: 10.3390/universe6120229
B. Mashhoon
{"title":"Toward Nonlocal Electrodynamics of Accelerated Systems","authors":"B. Mashhoon","doi":"10.3390/universe6120229","DOIUrl":"https://doi.org/10.3390/universe6120229","url":null,"abstract":"We revisit acceleration-induced nonlocal electrodynamics and the phenomenon of photon spin-rotation coupling. The kernel of the theory for the electromagnetic field tensor involves parity violation under the assumption of linearity of the field kernel in the acceleration tensor. However, we show that parity conservation can be maintained by extending the field kernel to include quadratic terms in the acceleration tensor. The field kernel must vanish in the absence of acceleration; otherwise, a general dependence of the kernel on the acceleration tensor cannot be theoretically excluded. The physical implications of the quadratic kernel are briefly discussed.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":"87 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90056852","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
Thermodynamic aspects of entropic cosmology with viscosity 具有粘性的熵宇宙学的热力学方面
arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-11-18 DOI: 10.1142/s0218271821500085
I. Brevik, A. Timoshkin, A. Timoshkin
{"title":"Thermodynamic aspects of entropic cosmology with viscosity","authors":"I. Brevik, A. Timoshkin, A. Timoshkin","doi":"10.1142/s0218271821500085","DOIUrl":"https://doi.org/10.1142/s0218271821500085","url":null,"abstract":"We describe the evolution of the early and late universe from thermodynamic considerations, using the generalized non-extensive Tsallis entropy with a variable exponent. A new element in our analysis is the inclusion of a bulk viscosity in the description of the cosmic fluid. Using the generalized Friedmann equation, a description of the early and the late universe is obtained.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79752661","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
What is a reduced boundary in general relativity? 广义相对论中的简化边界是什么?
arXiv: General Relativity and Quantum Cosmology Pub Date : 2020-11-14 DOI: 10.1142/S0218271821500504
E. Battista, G. Esposito
{"title":"What is a reduced boundary in general relativity?","authors":"E. Battista, G. Esposito","doi":"10.1142/S0218271821500504","DOIUrl":"https://doi.org/10.1142/S0218271821500504","url":null,"abstract":"The concept of boundary plays an important role in several branches of general relativity, e.g., the variational principle for the Einstein equations, the event horizon and the apparent horizon of black holes, the formation of trapped surfaces. On the other hand, in a branch of mathematics known as geometric measure theory, the usefulness has been discovered long ago of yet another concept, i.e., the reduced boundary of a finite-perimeter set. This paper proposes therefore a definition of finite-perimeter sets and their reduced in general relativity. Moreover, a basic integral formula of geometric measure theory is evaluated explicitly in the relevant case of Euclidean Schwarzschild geometry, for the first time in the literature. This research prepares the ground for a measure-theoretic approach to several concepts in gravitational physics, supplemented by geometric insight. Moreover, such an investigation suggests considering the possibility that the in-out amplitude for Euclidean quantum gravity should be evaluated over finite-perimeter Riemannian geometries that match the assigned data on their reduced boundary.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84047101","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
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
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
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
{"title":"A broadband signal recycling scheme for saturating the quantum limit from optical losses","authors":"Teng Zhang, J. Bentley, H. Miao","doi":"10.20944/preprints202011.0405.v1","DOIUrl":"https://doi.org/10.20944/preprints202011.0405.v1","url":null,"abstract":"Quantum noise limits the sensitivity of laser interferometric gravitational-wave detectors. Given the state-of-the-art optics, the optical losses define the lower bound of best possible quantum-limited detector sensitivity. In this work, we come up with the configuration which allows to saturate this lower bound by converting the signal recycling cavity to be a broadband signal amplifier using an active optomechanical filter. We will show the difference and advantage of such a broadband signal recycling scheme compared with the previous white-light-cavity scheme using the optomechanical filter in [Phys.Rev.Lett.115.211104 (2015)]. The drawback is that the new scheme is more susceptible to the thermal noise of the mechanical oscillator. To suppress the radiation pressure noise which rises along with the signal amplification, squeezing with input/output filter cavities and heavier test mass are used in this work.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":"52 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77283795","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
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
{"title":"The matter Lagrangian of an ideal fluid","authors":"S. Mendoza, S. Silva","doi":"10.1142/s0219887821500596","DOIUrl":"https://doi.org/10.1142/s0219887821500596","url":null,"abstract":"We show that the matter Lagrangian of an ideal fluid equals (up to a sign -depending on its definition and on the chosen signature of the metric) the total energy density of the fluid, i.e. rest energy density plus internal energy density.","PeriodicalId":8455,"journal":{"name":"arXiv: General Relativity and Quantum Cosmology","volume":" 18","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91412762","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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