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Turnaround Radius for charged particles in the Reissner–Nordström deSitter spacetime 赖斯纳-诺德斯特伦德西特时空中带电粒子的回转半径
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2024-05-20 DOI: 10.1007/s10714-024-03248-2
Ethan J. German, Joseph Sultana
{"title":"Turnaround Radius for charged particles in the Reissner–Nordström deSitter spacetime","authors":"Ethan J. German,&nbsp;Joseph Sultana","doi":"10.1007/s10714-024-03248-2","DOIUrl":"10.1007/s10714-024-03248-2","url":null,"abstract":"<div><p>We investigate the turnaround radius of the Reissner–Nordström deSitter Spacetime and how the turnaround radius changes if a test particle carries charge. We also consider the Martínez–Troncoso–Zanelli (MTZ) solution of conformally coupled gravity and investigate how the turnaround radius changes for a scalar test charge. In both scalar and electric interaction cases we find that the Turnaround Radius depends on the particle’s energy.\u0000</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"56 5","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10714-024-03248-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141074229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Photon ring bounds of scalar hairy charged black holes 标量毛状带电黑洞的光子环边界
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2024-05-15 DOI: 10.1007/s10714-024-03251-7
Yun Soo Myung
{"title":"Photon ring bounds of scalar hairy charged black holes","authors":"Yun Soo Myung","doi":"10.1007/s10714-024-03251-7","DOIUrl":"10.1007/s10714-024-03251-7","url":null,"abstract":"<div><p>We study photon rings of constant scalar hairy black holes with mass <i>m</i>, charge <i>Q</i>, and scalar hair <i>S</i> obtained from the Einstein-Maxwell-conformally coupled scalar theory. These black holes are classified as scalar hairy Reissner-Nordström (SHRN) black hole, scalar hairy charged black hole with <span>(S&gt; -Q^2)</span>, and mutated-RN black hole. The first two respect both dominant and strong energy conditions and have positive ADM mass and entropy, while the last does not respect two energy conditions and has negative ADM mass and entropy. We find that all of these black holes respect the lower bound (<span>(r_gamma ge 1.2 r_+)</span>) of photon rings. We obtain all real bounds of photon rings for these black holes and discuss physical and observational properties of real bounds. It is shown that the observationally favored region based on the shadow radius includes SHRN black hole, scalar hairy charged black hole, and mutated-RN black hole.\u0000</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"56 5","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140925116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The generalized Vaidya spacetime with polytropic equation of state 具有多态方程的广义韦迪雅时空
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2024-05-14 DOI: 10.1007/s10714-024-03244-6
Vitalii Vertogradov
{"title":"The generalized Vaidya spacetime with polytropic equation of state","authors":"Vitalii Vertogradov","doi":"10.1007/s10714-024-03244-6","DOIUrl":"10.1007/s10714-024-03244-6","url":null,"abstract":"<div><p>The process of the gravitational collapse might lead not only to a black hole but also to naked singularity formation. In this paper, we consider the generalized Vaidya spacetime with polytropic and generalized polytropic equations of state. We solve the Einstein and Einstein–Maxwell equations to obtain the explicit form of a mass function. We consider the limiting cases of solutions and find out, that generalized Vaidya spacetime might behave like Vaidya–de Sitter and Bonnor–Vaidya–de sitter solutions. Moreover, we explicitly show, that the part of solution, which depends on the polytropic index, is similar to cosmological fields surrounding both Vaidya and Bonnor–Vaidya black holes. The process of the gravitational collapse has been then considered. We have found out that the conditions of the naked singularity formation don’t depend on the polytropic index.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"56 5","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140919594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Galactic microlensing by backreacted massless wormholes 无质量虫洞反作用的银河微透镜现象
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2024-05-13 DOI: 10.1007/s10714-024-03246-4
G. F. Akhtaryanova, R. Kh. Karimov, R. N. Izmailov, K. K. Nandi
{"title":"Galactic microlensing by backreacted massless wormholes","authors":"G. F. Akhtaryanova,&nbsp;R. Kh. Karimov,&nbsp;R. N. Izmailov,&nbsp;K. K. Nandi","doi":"10.1007/s10714-024-03246-4","DOIUrl":"10.1007/s10714-024-03246-4","url":null,"abstract":"<div><p>We study here a novel application of Kim and Lee charged wormholes assuming them to be dark halo objects playing the role of lenses in the Galactic microlensing with source stars belonging to the Galactic Bulge and the Large Magellanic Cloud. First, we observe that both the backreacted scalar (<span>(alpha )</span>) and electrically (<i>Q</i>) charged wormholes have the same zero ADM mass as has the background Ellis–Bronnikov wormhole having a special equation of state parameter <span>(gamma = - 1)</span>. In particular, we argue that, for <span>(alpha ne 0)</span>, the solution formally resembles, but can at best be sourcewise different from, that of the background wormhole. The charge (<span>(Qne 0)</span>) thus provides an extra degree of freedom that introduces a non-trivial redshift function <span>(Phi )</span> to the background, alters its throat radius to <span>(r_{{text {th}}})</span>, yet keeps the wormhole massless. Second, we focus on this electrically charged case and calculate the light deflection angle up to 4th PPN order, analyze the effect of <i>Q</i> on the lensing observables such as the image positions, magnification, centroid and time delay of images of the source stars. Third, we analyze the probabilistic features such as optical depth and event rate estimated on the basis of the hypothesis that the wormhole lens could be bound or unbound to our Galaxy. Finally, we report an intriguing qualitative prediction that, compared to the Schwarzschild black hole, the Paczyński light curves of the electrically charged wormhole are much dimmer that also show characteristic gutters at the times the source enters and exits the Einstein ring. The gutters gradually come together as <i>Q</i> approaches the extreme limit <span>(frac{r_{{text {th}}}}{sqrt{2}})</span>, at which the Einstein radius <span>(R_{E})</span> vanishes so that the source crosses it instantly. It is speculated that re-analyzing past data on Galactic microlensing may betray the presence of charged wormholes.\u0000</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"56 5","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140914885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Signatures of quantum geometry from exponential corrections to the black hole entropy 从黑洞熵的指数修正看量子几何的特征
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2024-05-09 DOI: 10.1007/s10714-024-03241-9
Soham Sen, Ashis Saha, Sunandan Gangopadhyay
{"title":"Signatures of quantum geometry from exponential corrections to the black hole entropy","authors":"Soham Sen,&nbsp;Ashis Saha,&nbsp;Sunandan Gangopadhyay","doi":"10.1007/s10714-024-03241-9","DOIUrl":"10.1007/s10714-024-03241-9","url":null,"abstract":"<div><p>It has been recently shown in Chatterjee and Ghosh (Phys Rev Lett 125:041302, 2020, https://doi.org/10.1103/PhysRevLett.125.041302) that microstate counting carried out for quantum states residing on the horizon of a black hole leads to a correction of the form <span>(exp (-A/4l_p^2))</span> in the Bekenstein-Hawking form of the black hole entropy. In this paper, we develop a novel approach to obtain the possible form of the spacetime geometry from the entropy of the black hole for a given horizon radius. The uniqueness of this solution for a given energy-momentum tensor has also been discussed. Remarkably, the black hole geometry reconstructed has striking similarities to that of noncommutative-inspired Schwarzschild black holes (Nicolini et al. in Phys Lett B 632:547, 2006). We also obtain the matter density functions using Einstein field equations for the geometries we reconstruct from the thermodynamics of black holes. These also have similarities to that of the matter density function of a noncommutative-inspired Schwarzschild black hole. The conformal structure of the metric is briefly discussed and the Penrose–Carter diagram is drawn. We then compute the Komar energy and the Smarr formula for the effective black hole geometry and compare it with that of the noncommutative-inspired Schwarzschild black hole. We also discuss some astrophysical implications of the solutions. Finally, we propose a set of quantum Einstein vacuum field equations, as a solution of which we obtain one of the spacetime solutions obtained in this work. We then show a direct connection between the quantum Einstein vacuum field equations and the first law of black hole thermodynamics.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"56 5","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140895340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Distinguishing cosmological models through quantum signatures of primordial perturbations 通过原始扰动的量子特征区分宇宙学模型
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2024-05-08 DOI: 10.1007/s10714-024-03242-8
Rathul Nath Raveendran, Sumanta Chakraborty
{"title":"Distinguishing cosmological models through quantum signatures of primordial perturbations","authors":"Rathul Nath Raveendran,&nbsp;Sumanta Chakraborty","doi":"10.1007/s10714-024-03242-8","DOIUrl":"10.1007/s10714-024-03242-8","url":null,"abstract":"<div><p>We study the evolution of various measures of quantumness of the curvature perturbation by integrating out the inaccessible entropic fluctuations in the multi-field models of inflation. In particular, we discuss the following measures of quantumness, namely purity, entanglement entropy and quantum discord. The models being considered in this work are ones that produce large scale curvature power spectra similar to those produced by single-field models of inflation. More specifically, we consider different multi-field models which generate nearly scale invariant and oscillatory curvature power spectrum and compare their quantum signatures in the perturbations with the corresponding single-field models. We find that, even though different models of inflation may produce the same observable power spectrum on large scales, they have distinct quantum signatures arising from the perturbation modes. This may allow for a way to distinguish between different models of inflation based on their quantum signatures. Intriguingly, this result generalizes to bouncing scenarios as well.\u0000</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"56 5","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140881281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Quantum and higher curvature corrections to the anti-de Sitter black hole 反德西特黑洞的量子修正和高曲率修正
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2024-05-08 DOI: 10.1007/s10714-024-03240-w
Kristian Hauser Villegas, Reginald Christian Bernardo
{"title":"Quantum and higher curvature corrections to the anti-de Sitter black hole","authors":"Kristian Hauser Villegas,&nbsp;Reginald Christian Bernardo","doi":"10.1007/s10714-024-03240-w","DOIUrl":"10.1007/s10714-024-03240-w","url":null,"abstract":"<div><p>Black holes exert quantum pressure coming from the nonlocal gravity correction. We investigate this nonlocal correction for black holes in anti-de Sitter (AdS) spacetime and its dual boundary field theory. We show that the second order curvature and the nonlocal actions do not backreact on the AdS black hole metric. Thus, the interpretation of quantum pressure holds in the bulk for AdS black hole, generalizing the previous result for the asymptotically flat black hole. We then show that the leading geometric correction comes from the third order in curvature and explicitly calculate the corrections to the metric and to the horizon. For applications to AdS/CFT, we conjectured a nonlocal Gibbons–Hawking–York boundary term along with the necessary counter terms to cancel the ultraviolet divergence of the bulk action. We then calculate the thermodynamic quantities in the bulk and discuss their properties.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"56 5","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140895379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Local first law of black hole 黑洞局部第一定律
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2024-05-07 DOI: 10.1007/s10714-024-03243-7
Pabitra Tripathy, Pritam Nanda, Amit Ghosh
{"title":"Local first law of black hole","authors":"Pabitra Tripathy,&nbsp;Pritam Nanda,&nbsp;Amit Ghosh","doi":"10.1007/s10714-024-03243-7","DOIUrl":"10.1007/s10714-024-03243-7","url":null,"abstract":"<div><p>We investigated the form and implications of the local first law of black hole thermodynamics in relation to an observer located at a finite distance from the black hole horizon. Our study is based on the quasilocal form of the first law for black hole thermodynamics, given by <span>(delta {textsf{E}}=frac{{bar{kappa }}}{8pi }delta A)</span>, where <span>(delta {textsf{E}})</span> and <span>(delta A)</span> represent the changes in the black hole mass and area, respectively, and <span>({bar{kappa }})</span> denotes the quasilocal surface gravity. We show that even at a finite distance, the quasilocal law still holds. It shows how the first law scales with the observer’s location.\u0000</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"56 5","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10714-024-03243-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140845284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
(delta mathcal {N}) formalism on the past light-cone 关于过去光锥的 $$delta mathcal {N}$ 形式主义
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2024-05-05 DOI: 10.1007/s10714-024-03239-3
Giuseppe Fanizza, Giovanni Marozzi, Matheus Medeiros
{"title":"(delta mathcal {N}) formalism on the past light-cone","authors":"Giuseppe Fanizza,&nbsp;Giovanni Marozzi,&nbsp;Matheus Medeiros","doi":"10.1007/s10714-024-03239-3","DOIUrl":"10.1007/s10714-024-03239-3","url":null,"abstract":"<div><p>We apply the gradient expansion approximation to the light-cone gauge, obtaining a separate universe picture at non-linear order in perturbation theory within this framework. Thereafter, we use it to generalize the <span>(delta mathcal {N})</span> formalism in terms of light-cone perturbations. As a consistency check, we demonstrate the conservation of the gauge invariant curvature perturbation on uniform density hypersurface <span>(zeta )</span> at the completely non-linear level. The approach studied provides a self-consistent framework to connect at non-linear level quantities from the primordial universe, such as <span>(zeta )</span>, written in terms of the light-cone parameters, to late time observables.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"56 5","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140845589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Novel regular black holes: geometry, source and shadow 新颖的规则黑洞：几何、源和阴影
IF 2.1 4区 物理与天体物理
General Relativity and Gravitation Pub Date : 2024-04-29 DOI: 10.1007/s10714-024-03238-4
Anjan Kar, Sayan Kar
{"title":"Novel regular black holes: geometry, source and shadow","authors":"Anjan Kar,&nbsp;Sayan Kar","doi":"10.1007/s10714-024-03238-4","DOIUrl":"10.1007/s10714-024-03238-4","url":null,"abstract":"<div><p>We propose a two-parameter, static and spherically symmetric regular geometry, which, for specific parameter values represents a regular black hole. The matter required to support such spacetimes within the framework of general relativity (GR), is found to violate the energy conditions, though not in the entire domain of the radial coordinate. A particular choice of the parameters reduces the regular black hole to a singular, mutated Reissner–Nordström geometry. It also turns out that our regular black hole is geodesically complete. Fortunately, despite energy condition violation, we are able to construct a viable source, within the framework of GR coupled to matter, for our regular geometry. The source term involves a nonlinear magnetic monopole in a chosen version of nonlinear electrodynamics. We also suggest an alternative approach towards constructing a source, using the effective Einstein equations which arise in the context of braneworld gravity. Finally, we obtain the circular shadow profile of our regular black hole and provide a preliminary estimate of the metric parameters using recent observational results from the EHT collaboration.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"56 5","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140808427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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