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International Journal of Modern Physics D最新文献

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Quantum Gravity in Flat Spacetime 平坦时空中的量子引力
IF 2.2 4区 物理与天体物理
International Journal of Modern Physics D Pub Date : 2024-04-16 DOI: 10.1142/s0218271824500214
J. Makela
{"title":"Quantum Gravity in Flat Spacetime","authors":"J. Makela","doi":"10.1142/s0218271824500214","DOIUrl":"https://doi.org/10.1142/s0218271824500214","url":null,"abstract":"Inspired by Einstein's Strong Principle of Equivalence we consider the effects of quantum mechanics to the gravity-like phenomena experienced by an observer in a uniformly accelerating motion in flat spacetime. Among other things, our model of quantum gravity, derived from the first principles, predicts the Unruh effect, and a discrete area spectrum for spacelike two-surfaces.","PeriodicalId":50307,"journal":{"name":"International Journal of Modern Physics D","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140696534","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
Rotating regular black holes and other compact objects with a Tolman-type potential as a regular interior for the Kerr metric 旋转规则黑洞和其他具有托尔曼型势能的紧凑天体作为克尔公度量的规则内部
IF 2.2 4区 物理与天体物理
International Journal of Modern Physics D Pub Date : 2024-04-13 DOI: 10.1142/s021827182350102x
Angel D. D. Masa, Vilson T. Zanchin
{"title":"Rotating regular black holes and other compact objects with a Tolman-type potential as a regular interior for the Kerr metric","authors":"Angel D. D. Masa, Vilson T. Zanchin","doi":"10.1142/s021827182350102x","DOIUrl":"https://doi.org/10.1142/s021827182350102x","url":null,"abstract":"<p>In this paper, we obtain a new class of stationary axisymmetric spacetimes by using the Gürses–Gürsey metric with an appropriate mass function in order to generate a rotating core of matter that may be smoothly matched to the exterior Kerr metric. The same stationary spacetimes may be obtained by applying a slightly modified version of the Newman–Janis algorithm to a nonrotating spherically symmetric seed metric. The starting spherically symmetric configuration represents a nonisotropic de Sitter-type fluid whose radial pressure <span><math altimg=\"eq-00002.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow><mi>p</mi></mrow><mrow><mi>r</mi></mrow></msub></math></span><span></span> satisfies an state equation of the form <span><math altimg=\"eq-00003.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow><mi>p</mi></mrow><mrow><mi>r</mi></mrow></msub><mo>=</mo><mo>−</mo><mi>ρ</mi></math></span><span></span>, where the energy density <span><math altimg=\"eq-00004.gif\" display=\"inline\" overflow=\"scroll\"><mi>ρ</mi></math></span><span></span> is chosen to be the Tolman-type-VII energy density [R. C. Tolman, <i>Phys. Rev.</i><b>55</b>, 364 (1939)]. The resulting rotating metric is then smoothly matched to the exterior Kerr metric, and the main properties of the obtained geometries are investigated. All the solutions considered in this study are regular in the sense they are free of curvature singularities. Depending on the relative values of the total mass <i>m</i> and rotation parameter <i>a</i>, the resulting stationary spacetimes represent different kinds of rotating compact objects such as regular black holes, extremal regular black holes, and regular starlike configurations.</p>","PeriodicalId":50307,"journal":{"name":"International Journal of Modern Physics D","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140573477","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
Numerical analyses of M31 dark matter profiles M31 暗物质剖面的数值分析
IF 2.2 4区 物理与天体物理
International Journal of Modern Physics D Pub Date : 2024-04-10 DOI: 10.1142/s0218271824500160
Kuantay Boshkayev, Talgar Konysbayev, Yergali Kurmanov, Orlando Luongo, Marco Muccino, Hernando Quevedo, Gulnur Zhumakhanova
{"title":"Numerical analyses of M31 dark matter profiles","authors":"Kuantay Boshkayev, Talgar Konysbayev, Yergali Kurmanov, Orlando Luongo, Marco Muccino, Hernando Quevedo, Gulnur Zhumakhanova","doi":"10.1142/s0218271824500160","DOIUrl":"https://doi.org/10.1142/s0218271824500160","url":null,"abstract":"<p>In this paper, we reproduce the rotation curve of the Andromeda galaxy (M31) by taking into account its bulge, disk and halo components, considering the last one to contain the major part of dark matter mass. Hence, our prescription is to split the galactic bulge into two components, namely, the inner and main bulges, respectively. Both bulges are thus modeled by exponential density profiles since we underline that the widely accepted de Vaucouleurs law fails to reproduce the whole galactic bulge rotation curve. In addition, we adopt various well-known phenomenological dark matter profiles to estimate the dark matter mass in the halo region. Moreover, we apply the least-squares fitting method to determine from the rotation curve the model free parameters, namely, the characteristic (central) density, scale radius and consequently the total mass. To do so, we perform Markov chain Monte Carlo statistical analyses based on the Metropolis algorithm, maximizing our likelihoods adopting velocity and radii data points of the rotation curves. We do not fit separately the components for bulges, disk and halo, but we perform an overall fit including all the components and employing all the data points. Thus, we critically analyze our corresponding findings and, in particular, we employ the Bayesian information criterion to assess the most accredited model to describe M31 dark matter dynamics.</p>","PeriodicalId":50307,"journal":{"name":"International Journal of Modern Physics D","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140573741","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
Qualitative probe of interacting dark energy with redshift-space distortions 利用红移空间扭曲定性探测相互作用暗能量
IF 2.2 4区 物理与天体物理
International Journal of Modern Physics D Pub Date : 2024-03-26 DOI: 10.1142/s0218271824500123
Didam G. A. Duniya
{"title":"Qualitative probe of interacting dark energy with redshift-space distortions","authors":"Didam G. A. Duniya","doi":"10.1142/s0218271824500123","DOIUrl":"https://doi.org/10.1142/s0218271824500123","url":null,"abstract":"<p>The imprint of interacting dark energy (IDE) needs to be correctly identified in order to avoid bias in constraints on IDE. This paper investigates the large-scale imprint of IDE in redshift-space distortions (RSDs), using <i>Euclid</i>-like photometric prescriptions. A first attempt at incorporating the IDE dynamics in the galaxy (clustering and evolution) biases is made. Without IDE dynamics taken into account in the galaxy biases, as is conventionally done, the results suggest that for a constant dark energy (DE) equation of state parameter, an IDE model where the DE transfer rate is proportional to the DE density exhibits an alternating, positive–negative effect in the RSDs angular power spectrum. However, when the IDE dynamics is incorporated in the galaxy biases, it is found that the apparent positive–negative alternating effect vanishes: implying that neglecting IDE dynamics in the galaxy biases can result in “artifacts” that can lead to incorrect identification of the IDE imprint. In general, the results show that multi-tracer analysis will be needed to beat down cosmic variance in order for the RSDs angular power spectrum as a statistic to be a viable diagnostic of IDE. Moreover, it is found that RSDs hold the potential to constrain IDE on large scales, at redshifts <span><math altimg=\"eq-00001.gif\" display=\"inline\" overflow=\"scroll\"><mi>z</mi><mo>≤</mo><mn>1</mn></math></span><span></span>, with the scenario having IDE dynamics incorporated in the biases showing better potential.</p>","PeriodicalId":50307,"journal":{"name":"International Journal of Modern Physics D","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140315407","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
Plane-fronted electromagnetic waves and an asymptotic limit of Liénard–Wiechert fields 平面电磁波和李纳-维切特场的渐近极限
IF 2.2 4区 物理与天体物理
International Journal of Modern Physics D Pub Date : 2024-03-23 DOI: 10.1142/s0218271824500093
Peter A. Hogan, Dirk Puetzfeld
{"title":"Plane-fronted electromagnetic waves and an asymptotic limit of Liénard–Wiechert fields","authors":"Peter A. Hogan, Dirk Puetzfeld","doi":"10.1142/s0218271824500093","DOIUrl":"https://doi.org/10.1142/s0218271824500093","url":null,"abstract":"<p>Colliding or noncolliding plane-fronted electromagnetic or gravitational waves are the asymptotic limit of Robinson–Trautman spherical electromagnetic or gravitational waves. Noncolliding plane-fronted waves contain no information about their sources whereas colliding waves contain information about possibly the motion of their sources. As a first step to investigate the latter phenomenon, we construct an asymptotic limit of Liénard–Wiechert electromagnetic fields in the context of Minkowskian spacetime. This has the advantage that the source is well known and the calculations can be carried out in full detail. The final result is an algebraically general Maxwell field which consists of colliding plane-fronted waves in a subregion of Minkowskian spacetime and an interesting byproduct is a novel perspective on a Maxwell field originally discovered by Bateman.</p>","PeriodicalId":50307,"journal":{"name":"International Journal of Modern Physics D","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140201919","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
Generalized Lagrangian for Canonical and Non-Canonical Scalar Field 规范和非规范标量场的广义拉格朗日
IF 2.2 4区 物理与天体物理
International Journal of Modern Physics D Pub Date : 2024-03-22 DOI: 10.1142/s0218271823400096
T. Joshi, S. Pathak, Maxim Khlopov
{"title":"Generalized Lagrangian for Canonical and Non-Canonical Scalar Field","authors":"T. Joshi, S. Pathak, Maxim Khlopov","doi":"10.1142/s0218271823400096","DOIUrl":"https://doi.org/10.1142/s0218271823400096","url":null,"abstract":"","PeriodicalId":50307,"journal":{"name":"International Journal of Modern Physics D","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140212482","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
Accelerating Gauss-Bonnet universe with constrained parameters 带约束参数的加速高斯-波纳宇宙
IF 2.2 4区 物理与天体物理
International Journal of Modern Physics D Pub Date : 2024-03-22 DOI: 10.1142/s0218271824500172
A. Dixit, S. Shekh, Dr. Sanjay Ramkrishna Bhoyar, M. C. Dhabe
{"title":"Accelerating Gauss-Bonnet universe with constrained parameters","authors":"A. Dixit, S. Shekh, Dr. Sanjay Ramkrishna Bhoyar, M. C. Dhabe","doi":"10.1142/s0218271824500172","DOIUrl":"https://doi.org/10.1142/s0218271824500172","url":null,"abstract":"","PeriodicalId":50307,"journal":{"name":"International Journal of Modern Physics D","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140215263","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
Universe bouncing its way to inflation 宇宙反弹通胀
IF 2.2 4区 物理与天体物理
International Journal of Modern Physics D Pub Date : 2024-03-22 DOI: 10.1142/s0218271824500068
Manjeet Kaur, Debottam Nandi, Debajyoti Choudhury, T. R. Seshadri
{"title":"Universe bouncing its way to inflation","authors":"Manjeet Kaur, Debottam Nandi, Debajyoti Choudhury, T. R. Seshadri","doi":"10.1142/s0218271824500068","DOIUrl":"https://doi.org/10.1142/s0218271824500068","url":null,"abstract":"<p>Cosmological models with inflation and those with bounce have their own strengths and weaknesses. Here, we construct a model in which a phase of bounce is followed by a viable inflationary phase. This incorporates several advantages of both and hence, is a more viable model for cosmic evolution. We explore scenarios wherein the bouncing phase smoothly transits to an inflationary one, with the pivot scale leaving the Hubble horizon during the latter era, thereby maintaining consistency with observations. Staying within the ambit of Einstein–Hilbert gravity augmented by the inflation, we ensure a pre-inflationary bounce by introducing a second scalar field that helps engineer the requisite violation of the null energy condition. Potential ghost instabilities can be mitigated by invoking a nontrivial coupling between the two scalar fields.</p>","PeriodicalId":50307,"journal":{"name":"International Journal of Modern Physics D","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140201868","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
Noncommutative effects on wormholes in Rastall–Rainbow gravity 拉斯塔尔-彩虹引力中虫洞的非交换效应
IF 2.2 4区 物理与天体物理
International Journal of Modern Physics D Pub Date : 2024-03-20 DOI: 10.1142/s0218271824500081
Anirudh Pradhan, Safiqul Islam, M. Zeyauddin, Ayan Banerjee
{"title":"Noncommutative effects on wormholes in Rastall–Rainbow gravity","authors":"Anirudh Pradhan, Safiqul Islam, M. Zeyauddin, Ayan Banerjee","doi":"10.1142/s0218271824500081","DOIUrl":"https://doi.org/10.1142/s0218271824500081","url":null,"abstract":"<p>In this paper, we explore the physical properties and characteristics of static, spherically symmetric wormholes in the background of Rastall–Rainbow gravity. The Rastall–Rainbow gravity theory has recently been proposed as a combination of two theories, namely, the Rastall theory and the Rainbow description. We implemented noncommutativity by adopting two different distributions of energy density (Gaussian and Lorentzian) in the Morris and Thorne metric. We solve the field equations analytically and discuss all the properties of wormholes depending on the two model parameters. Notably, for specific parameter ranges, one can alleviate the violation of the WEC at the throat and its neighborhood.</p>","PeriodicalId":50307,"journal":{"name":"International Journal of Modern Physics D","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140167258","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
Null geodesic structure for the Barriola–Vilenkin spacetime via k-essence 巴里奥拉-维伦金时空的空大地结构（通过 k-等价性
IF 2.2 4区 物理与天体物理
International Journal of Modern Physics D Pub Date : 2024-03-15 DOI: 10.1142/s0218271824500056
Bivash Majumder, Saibal Ray, Goutam Manna
{"title":"Null geodesic structure for the Barriola–Vilenkin spacetime via k-essence","authors":"Bivash Majumder, Saibal Ray, Goutam Manna","doi":"10.1142/s0218271824500056","DOIUrl":"https://doi.org/10.1142/s0218271824500056","url":null,"abstract":"<p>Based on the work of Chandrasekhar [<i>The Mathematical Theory of Black Holes</i>, Chap. 3, Sec. 20 (Oxford University Press, 1992)], we investigate the null geodesic structure of the emergent Barriola–Vilenkin (BV) spacetime in the context of <i>k</i>-essence theory. For <i>k</i>-essence, the emergent gravity metric is a one-to-one correspondence with the BV metric connected to the Schwarzschild background, where the global monopole charge is replaced by the dark energy density. This equivalence holds specifically for a certain class of <i>k</i>-essence scalar fields that have been constructed by Gangopadhyay and Manna [<i>Eur. Phys. Lett.</i> <b>100</b>, 49001 (2012)]. We have traced out different trajectories for null geodesic in the presence of dark energy for the <i>k</i>-essence emergent BV spacetime. It is demonstrated that the outcomes deviate from the typical Schwarzschild spacetime owing to the fundamental configuration with a constant dark energy density.</p>","PeriodicalId":50307,"journal":{"name":"International Journal of Modern Physics D","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140153423","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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