General Relativity and Gravitation最新文献

GUP deformed background dynamics of phantom field 幻影场的 GUP 变形背景动态

IF 2.1 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-11-16 DOI: 10.1007/s10714-024-03324-7

Gaurav Bhandari, S. D. Pathak, Manabendra Sharma, Anzhong Wang

引用次数: 0

Role of dynamical vacuum energy in the closed universe: implications for bouncing scenario 动态真空能在封闭宇宙中的作用：对弹跳情景的影响

IF 2.1 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-11-14 DOI: 10.1007/s10714-024-03325-6

Ashutosh Singh

引用次数: 0

Probing naked singularities in the charged and uncharged (gamma - metrics) with quantum wave packets 用量子波包探测带电和不带电(gamma - metrics)中的裸奇点

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2023-09-01 DOI: 10.1007/s10714-023-03146-z

Ozay Gurtug, Mustafa Halilsoy, Mert Mangut

{"title":"Probing naked singularities in the charged and uncharged (gamma - metrics) with quantum wave packets","authors":"Ozay Gurtug, Mustafa Halilsoy, Mert Mangut","doi":"10.1007/s10714-023-03146-z","DOIUrl":"10.1007/s10714-023-03146-z","url":null,"abstract":"<div><p>The non-trivial naked singularities that possess directional behavior in the charged and uncharged Zipoy-Voorhees (ZV) spacetimes, known as <span>( gamma - metrics )</span> are investigated within the context of quantum mechanics. Classically singular spacetime is understood as a geodesic incompleteness with respect to a particle probe, while quantum singularity is understood as a non-unique evolution of test quantum wave packets. In this study, quantum wave packets obeying Klein–Gordon equation are used to probe timelike naked singularities. It is shown by rigorous mathematical calculations that the outermost singularity developed in the charged and uncharged ZV spacetime on the equatorial plane is quantum mechanically singular for all values of the deformation parameter <span>(gamma )</span>. However, directional singularities that develop on the symmetry axis is shown to be healed partially for specific range of the parameter <span>(gamma )</span>, if the analysis is restricted purposely to only specific mode (s-wave mode). Allowing arbitrary modes, classical directional singularities remains quantum singular.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"55 9","pages":""},"PeriodicalIF":2.8,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4063744","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: 1

Dissipative properties of relativistic fluids in a general curved space–time 广义弯曲时空中相对论性流体的耗散性质

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2023-08-11 DOI: 10.1007/s10714-023-03137-0

A. L. García-Perciante, A. R. Méndez

引用次数: 0

GUP corrected Casimir wormholes in f(Q) gravity GUP修正了f(Q)重力下的卡西米尔虫洞

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2023-08-10 DOI: 10.1007/s10714-023-03139-y

Zinnat Hassan, Sayantan Ghosh, P. K. Sahoo, V. Sree Hari Rao

{"title":"GUP corrected Casimir wormholes in f(Q) gravity","authors":"Zinnat Hassan, Sayantan Ghosh, P. K. Sahoo, V. Sree Hari Rao","doi":"10.1007/s10714-023-03139-y","DOIUrl":"10.1007/s10714-023-03139-y","url":null,"abstract":"<div><p>We have systematically presented the effect of the generalized uncertainty principle (GUP) in Casimir wormhole space-time in the recently proposed modified gravity, the so-called symmetric teleparallel gravity, or <i>f</i>(<i>Q</i>) gravity. We consider two famous GUP models, such as the Kempf, Mangano, and Mann (KMM) model and the Detournay, Gabriel, and Spindel (DGS) model, in this study. Also, to find the solutions, we assumed two different <i>f</i>(<i>Q</i>) forms and obtained analytic as well as numerical solutions under the effect of GUP. Besides this, we investigate the solutions with three different redshift functions under an anisotropic fluid located at the throat. Further, we analyzed the obtained wormhole solutions with energy conditions, especially null energy conditions at the wormhole’s throat, and encountered that some arbitrary quantity disrespects the classical energy conditions at the wormhole throat of radius <span>(r_0)</span>. Later, the ADM mass and the volume integral quantifier are also discussed to calculate the amount of exotic matter required near the wormhole throat. Additionally, we show the behavior of the equation of state parameters under the effect of GUP.\u0000</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"55 8","pages":""},"PeriodicalIF":2.8,"publicationDate":"2023-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4414064","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: 4

String-like brane splitting in the context of (f(T,mathcal {B})) gravity (f(T,mathcal {B}))重力背景下的弦状膜分裂

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2023-07-31 DOI: 10.1007/s10714-023-03136-1

A. R. P. Moreira, C. A. S. Almeida

引用次数: 0

Solutions of a charged scalar field in five-dimensional helicoid solution with electromagnetic field 电磁场作用下五维螺旋面解中带电标量场的解

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2023-07-27 DOI: 10.1007/s10714-023-03134-3

Tolga Birkandan

引用次数: 0

Cosmological solutions through gravitational decoupling in (f({mathcal {R}},{mathcal {T}},{mathcal {R}}_{textrm{ab}}{mathcal {T}}^{textrm{ab}})) gravity 通过(f({mathcal {R}},{mathcal {T}},{mathcal {R}}_{textrm{ab}}{mathcal {T}}^{textrm{ab}}))重力解耦的宇宙学解

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2023-07-27 DOI: 10.1007/s10714-023-03135-2

M. Sharif, Tayyab Naseer

{"title":"Cosmological solutions through gravitational decoupling in (f({mathcal {R}},{mathcal {T}},{mathcal {R}}_{textrm{ab}}{mathcal {T}}^{textrm{ab}})) gravity","authors":"M. Sharif, Tayyab Naseer","doi":"10.1007/s10714-023-03135-2","DOIUrl":"10.1007/s10714-023-03135-2","url":null,"abstract":"<div><p>In this paper, we adopt minimal gravitational decoupling scheme to extend a non-static spherically symmetric isotropic composition to anisotropic interior in <span>(f({mathcal {R}},{mathcal {T}},{mathcal {R}}_{textrm{ab}}{mathcal {T}}^{textrm{ab}}))</span> theory. A geometric deformation is applied only on <span>(g_{rr})</span> metric component through which the modified field equations are separated into two sets, each of them correspond to their parent (seed and newly added) source. An isotropic model suggested by the Friedmann–Lemaitre–Robertson–Walker metric is adopted to reduce the unknowns in the first set. We then obtain an isotropic solution by making use of a linear equation of state and a particular form of the scale factor. A density-like constraint is chosen to solve the other sector containing the deformation function and multiple components of an additional matter source. Further, the graphical interpretation of the developed model is carried out to analyze how a decoupling parameter and modified gravity influence the evolutionary phases of the universe. It is concluded that only the radiation-dominated era meets stability criteria everywhere in this matter-geometry coupled theory.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"55 8","pages":""},"PeriodicalIF":2.8,"publicationDate":"2023-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5042758","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: 5

Higgs phonon: conformal phonon and Hawking temperature in a two-dimensional acoustic black hole model 希格斯声子:二维声学黑洞模型中的共形声子和霍金温度

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2023-07-11 DOI: 10.1007/s10714-023-03133-4

Jun Yan

{"title":"Higgs phonon: conformal phonon and Hawking temperature in a two-dimensional acoustic black hole model","authors":"Jun Yan","doi":"10.1007/s10714-023-03133-4","DOIUrl":"10.1007/s10714-023-03133-4","url":null,"abstract":"<div><p>The present study investigates the coupling of the hyperbolic potential and conformal Liouville potential to the phonon field in two-dimensional gravity. The specific values of the horizon coordinate, Hawking temperature, phonon mass, and fluid velocity were calculated, and the change in physical quantities with the field coefficient <span>(delta)</span> and central charge <i>c</i> was discussed. In the hyperbolic potential model, it was found that the phonon was very similar to the Higgs particle. The size of the horizon was 10 µm, the magnitude of the Hawking temperature was 1 nK, the magnitude of the fluid velocity was 1 mm/s, and the magnitude of the Higgs phonon mass was between 10<sup>–8</sup> eV and 10<sup>–7</sup> eV. In the conformal Liouville model, it was found that the variation trend of each physical quantity in the different branches was opposite, the size of the horizon was 10 µm, the magnitude of the Hawking temperature was between 0.1 and 1.0 nK, the magnitude of the fluid velocity was 1 mm/s, and the magnitude of the conformal phonon mass was 10<sup>–7</sup> eV. The calculation results of the present study were basically consistent with the results obtained by Barcelo and Steinhauer et al., but completely different physical models and new calculation methods were used.</p></div>","PeriodicalId":578,"journal":{"name":"General Relativity and Gravitation","volume":"55 7","pages":""},"PeriodicalIF":2.8,"publicationDate":"2023-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4760988","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

Fluid nature constrains Horndeski gravity 流体性质限制了霍恩德斯基引力

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2023-07-09 DOI: 10.1007/s10714-023-03128-1

Marcello Miranda, Daniele Vernieri, Salvatore Capozziello, Valerio Faraoni

引用次数: 9