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Estimating the Local Hubble Parameter from the Thermal Evolution of Earth and Mars 从地球和火星的热演化估计局部哈勃参数
IF 1 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-12-03 DOI: 10.1134/S0202289325700355
Yu. V. Dumin, E. G. Khramova, L. M. Svirskaya, E. S. Savinykh#
{"title":"Estimating the Local Hubble Parameter from the Thermal Evolution of Earth and Mars","authors":"Yu. V. Dumin,&nbsp;E. G. Khramova,&nbsp;L. M. Svirskaya,&nbsp;E. S. Savinykh#","doi":"10.1134/S0202289325700355","DOIUrl":"10.1134/S0202289325700355","url":null,"abstract":"<p>The problem of local (e.g., interplanetary) Hubble expansion is studied for a long time but remains a controversial subject till now; and of particular interest is a plausible value of the local Hubble parameter at the scale of the Solar system. Here, we tried to estimate the corresponding quantity by the analysis of surface temperatures on the Earth and Mars, which are formed by a competition between a variable luminosity of the Sun and increasing radii of the planetary orbits. Our work employs paleochemical and paleobiological data on the temperature of the ancient Earth, on the one hand, and geological data on the existence of an ocean of liquid water on the ancient Mars, on the other hand. As follows from our analysis, the martian data impose only a weak constraint on the admissible values of the Hubble parameter because of unknown salinity, and therefore the freezing point of the martian water. On the other hand, the terrestrial data turn out to be much more valuable, especially, for the Precambrian period, when temperature variation was sufficiently smooth and monotonic. For example, in the framework of the standard <span>(Lambda)</span>CDM model with 70<span>(%)</span> of dark energy, the contemporary value of the local Hubble parameter was found to be 70–90 km/s/Mpc under assumption that the Earth’s surface temperature at the end of Precambrian equaled <span>(45^{circ})</span>C. It is in reasonable agreement both with the intergalactic data and with an independent estimate of the local Hubble parameter from tidal evolution of the Earth–Moon system.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 4","pages":"489 - 498"},"PeriodicalIF":1.0,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145659328","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
Wiener Interpretation of Quantum Mechanics, the Skyrme–Faddeev Chiral Model, and Neutrino Oscillations 量子力学的维纳解释，Skyrme-Faddeev手性模型，和中微子振荡
IF 1 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-12-03 DOI: 10.1134/S0202289325700318
Yu. P. Rybakov
{"title":"Wiener Interpretation of Quantum Mechanics, the Skyrme–Faddeev Chiral Model, and Neutrino Oscillations","authors":"Yu. P. Rybakov","doi":"10.1134/S0202289325700318","DOIUrl":"10.1134/S0202289325700318","url":null,"abstract":"<p>We consider the essence of the well-known discussion between Bohr and Einstein (1935), which concerned the completeness of quantum mechanics. If one followed Bohr, then the wave function would give the probability description of an individual particle. However, Einstein considered the wave function as an instrument for describing the statistical ensemble of identical particles—solitons. On the other hand, Wiener found the special <span>(alpha)</span>-representation of quantum mechanics, for which the wave function appeared to be an element of the random Hilbert space with normal dispersion. This fact proves the equivalence of Bohr’s and Einstein’s positions, the central limiting theorem being taken into account. Also the dark matter hypothesis and new possibilities of the Brioschi 16-spinor realization of the Skyrme–Faddeev chiral model are discussed, including the neutrino oscillation problem.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 4","pages":"447 - 453"},"PeriodicalIF":1.0,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145659329","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
Observational Constraints on (boldsymbol{alpha})-Starobinsky Inflation (boldsymbol{alpha}) -Starobinsky暴胀的观测约束
IF 1 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-12-03 DOI: 10.1134/S0202289325700392
Saisandri Saini, Akhilesh Nautiyal
{"title":"Observational Constraints on (boldsymbol{alpha})-Starobinsky Inflation","authors":"Saisandri Saini,&nbsp;Akhilesh Nautiyal","doi":"10.1134/S0202289325700392","DOIUrl":"10.1134/S0202289325700392","url":null,"abstract":"<p>We revisit the <span>(alpha)</span>-Starobinsky inflation, also known as the <span>(E)</span>-model, in the light of current CMB and LSS observations. The inflaton potential in the Einstein frame for this model contains a parameter <span>(alpha)</span> in the exponential, which alters the predictions for the scalar and tensor power spectra of Starobinsky inflation. We obtain these power spectra numerically without using the slow-roll approximation, and perform MCMC analysis to put constraints on the parameters <span>(M)</span> and <span>(alpha)</span> from Planck-2018, BICEP/Keck (BK18) and other LSS observations. We consider the general reheating scenario by varying the number of e-foldings during inflation, <span>(N_{textrm{privot}})</span>, along with other parameters. We find <span>(log_{10}alpha=0.0^{+1.6}_{-5.6})</span>, <span>(log_{10}M=-4.91^{+0.69}_{-2.7})</span>, and <span>(N_{textrm{privot}}=53.2^{+3.9}_{-5})</span> with <span>(95%)</span> C.L. This implies that the present CMB and LSS observations are insufficient for constraining the parameter <span>(alpha)</span>. We also find that there is no correlation between <span>(N_{textrm{privot}})</span> and <span>(alpha)</span>.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 4","pages":"517 - 525"},"PeriodicalIF":1.0,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145659323","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
Evaluation of the Magnetic Field of Hot Jupiters within the Geometric Approach 用几何方法评价热木星的磁场
IF 1 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-12-03 DOI: 10.1134/S0202289325700380
I. A. Babenko, A. G. Zhilkin
{"title":"Evaluation of the Magnetic Field of Hot Jupiters within the Geometric Approach","authors":"I. A. Babenko,&nbsp;A. G. Zhilkin","doi":"10.1134/S0202289325700380","DOIUrl":"10.1134/S0202289325700380","url":null,"abstract":"<p>We discuss theoretical and experimental foundations of the hypothesis on the origin of magnetic fields of the Earth and other astrophysical objects, proposed in the early 20th century by W. Sutherland, A. Einstein, and independently by Yu.S. Vladimirov. According to this hypothesis, the electric charges of the electron and proton slightly differ in magnitude, leading to the emergence of magnetic fields in rotating astrophysical objects. A theoretical justification of the Sutherland–Einstein hypothesis is presented in a simplified version of the 6D Kaluza–Klein theory, taking into account the consequences of the Kerr–Newman metric. The analysis shows that a fundamental dipole-type magnetic field should arise around any massive rotating body. However, in real astrophysical objects, such a field is largely screened and distorted by induced charges and currents. As an application, we consider the problem of determining the magnetic fields of hot Jupiters, since strong tidal effects in these giant exoplanets should result in approximately similar screening mechanisms.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 4","pages":"509 - 516"},"PeriodicalIF":1.0,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145659322","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
Tachyon Inflation in (boldsymbol{R+R^{2}}) Background (boldsymbol{R+R^{2}})背景中的超光速子暴胀
IF 1 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-12-03 DOI: 10.1134/S0202289325700409
Salomeh Khoeini-Moghaddam
{"title":"Tachyon Inflation in (boldsymbol{R+R^{2}}) Background","authors":"Salomeh Khoeini-Moghaddam","doi":"10.1134/S0202289325700409","DOIUrl":"10.1134/S0202289325700409","url":null,"abstract":"<p>The presence of a tachyon field in <span>(R+mu R^{2})</span> theory is considered. Our analysis shows that the tachyon field contribution to the energy density is suppressed, but it affects cosmological parameters; in particular, the spectral index is modified. This model is in agreement with Panck2018 data for some parameter ranges.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 4","pages":"526 - 531"},"PeriodicalIF":1.0,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145659324","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
Isotropic Spherically Symmetric Weyssenhoff Fluid Sphere Models in Einstein–Cartan Theory 爱因斯坦-卡坦理论中的各向同性球对称Weyssenhoff流体球模型
IF 1 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-12-03 DOI: 10.1134/S0202289325700331
L. N. Katkar, D. R. Phadatare
{"title":"Isotropic Spherically Symmetric Weyssenhoff Fluid Sphere Models in Einstein–Cartan Theory","authors":"L. N. Katkar,&nbsp;D. R. Phadatare","doi":"10.1134/S0202289325700331","DOIUrl":"10.1134/S0202289325700331","url":null,"abstract":"<p>We present new exact solutions to the Einstein–Cartan (EC) field equations for static, spherically symmetric configurations of a noncharged Weyssenhoff fluid in isotropic coordinates, derived using the extended technique of differential forms applied to the non-Riemannian space-time of the Einstein–Cartan theory of gravitation (ECTG). The solutions exhibit regular behavior with nonnegative pressure and energy density, and satisfy the adiabatic stability condition <span>({1/sqrt{3}&lt;a&lt;1})</span>. All models are rotating and accelerating, with vanishing expansion and shear. Spin contributions explicitly influence the matter distribution; in the spinless limit, the solutions reduce to those of Narlikar and Kuchowicz. For specific parameter values <span>(n)</span> (<span>(sqrt{2}leq nleq 2)</span>), the models may be applicable to neutrino geodesic motion and other compact object studies in EC gravity.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 4","pages":"466 - 475"},"PeriodicalIF":1.0,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145659332","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
Review of Analytic Results on Quasinormal Modes of Black Holes 黑洞准正态模的解析结果综述
IF 1 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-12-03 DOI: 10.1134/S0202289325700306
Sergei V. Bolokhov, Milena Skvortsova
{"title":"Review of Analytic Results on Quasinormal Modes of Black Holes","authors":"Sergei V. Bolokhov,&nbsp;Milena Skvortsova","doi":"10.1134/S0202289325700306","DOIUrl":"10.1134/S0202289325700306","url":null,"abstract":"<p>We present a brief review of known analytic results for quasinormal modes (QNMs) of black holes and related space-times. We consider regimes in which the perturbation equations admit exact or perturbative solutions, providing insights complementary to numerical or semi-analytic approaches. We discuss solvable cases in lower-dimensional space-times, algebraically special modes, and exact results in higher-curvature gravity theories. Particular attention is given to the eikonal mode and its correspondence with null geodesics, as well as to beyond-eikonal approximations based on inverse multipole expansions  in parametrized metrics. We review analytic solutions obtained in the near-extremal limit of Schwarzschild–de Sitter black holes, in the regime of large field mass, and in pure de Sitter and anti–de Sitter space-times, where boundary conditions play a crucial role. Being not exhaustive, this overview highlights the diversity of techniques and physical insights made possible by analytic treatments of quasinormal spectra.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 4","pages":"423 - 446"},"PeriodicalIF":1.0,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145659357","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
Gravitationally Bound Systems on Different Quantization Levels({}^{mathbf{{}^{sharp}}}) 不同量子化水平上的引力束缚系统({}^{mathbf{{}^{sharp}}})
IF 1 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-12-03 DOI: 10.1134/S0202289325700379
M. L. Fil’chenkov, Yu. P. Laptev
{"title":"Gravitationally Bound Systems on Different Quantization Levels({}^{mathbf{{}^{sharp}}})","authors":"M. L. Fil’chenkov,&nbsp;Yu. P. Laptev","doi":"10.1134/S0202289325700379","DOIUrl":"10.1134/S0202289325700379","url":null,"abstract":"<p>Levels of quantization in gravity theory have been classified. Objects and processes in gravitationally bound systems and their general properties are analyzed to create a consistent theory of gravity quantization and to construct quantum models of compact astrophysical objects and the early Universe.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 4","pages":"507 - 508"},"PeriodicalIF":1.0,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145659321","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
Photon Sphere for a Dilatonic Dyonic Black Hole in a Model with an Abelian Gauge Field and a Scalar Field 具有阿贝尔规范场和标量场模型的扩张动子黑洞的光子球
IF 1 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-12-03 DOI: 10.1134/S0202289325700471
V. D. Ivashchuk, U. S. Kayumov, A. N. Malybayev, G. S. Nurbakova
{"title":"Photon Sphere for a Dilatonic Dyonic Black Hole in a Model with an Abelian Gauge Field and a Scalar Field","authors":"V. D. Ivashchuk,&nbsp;U. S. Kayumov,&nbsp;A. N. Malybayev,&nbsp;G. S. Nurbakova","doi":"10.1134/S0202289325700471","DOIUrl":"10.1134/S0202289325700471","url":null,"abstract":"<p>A dilatonic dyonic black hole solution with the gravitational radius <span>(2mu)</span> and two charges <span>(Q_{1})</span> and <span>(Q_{2})</span> (electric and magnetic ones) is considered in a gravitational 4D model with one scalar field and one 2-form, with the dilatonic coupling constant <span>(lambda=pm 1/sqrt{2})</span>. Circular null geodesics are explored. The 3rd order polynomial master equation for the radius <span>(R_{0})</span> of photon sphere is studied. There is only one solution with <span>(R_{0}&gt;2mu)</span>. The circular null geodesics are shown to be unstable. The black hole shadow is studied, and relations for the shadow angle and critical impact parameter are obtained.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 4","pages":"591 - 599"},"PeriodicalIF":1.0,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145659333","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 Schrödinger Equation for a Spherically Symmetric System, Its Structure and Solutions# 球对称系统的Schrödinger方程、结构和解#
IF 1 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-09-04 DOI: 10.1134/S0202289325700185
R. I. Ayala Oña, T. P. Shestakova
{"title":"The Schrödinger Equation for a Spherically Symmetric System, Its Structure and Solutions#","authors":"R. I. Ayala Oña,&nbsp;T. P. Shestakova","doi":"10.1134/S0202289325700185","DOIUrl":"10.1134/S0202289325700185","url":null,"abstract":"<p>The Wheeler–DeWitt geometrodynamics, as the first attempt to develop a quantum theory of gravity, faces certain challenges, including the problem of time and interpretation of the wave function. In this paper, we present the extended phase space approach to quantization of gravity as an alternative approach to the Wheeler–DeWitt quantum geometrodynamics. For a space-time with a nontrivial topology, the Wheeler–DeWitt equation loses its sense, but we can derive the Schrödinger equation. Until now, the Schrödinger equation was derived for systems with a finite number of degrees of freedom, and we need to generalize the procedure for field models. The simplest field model is a spherically symmetric one. We derive the integro-differential Schrödinger equation for this model, examine its structure, and find its solution.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 3","pages":"312 - 318"},"PeriodicalIF":1.0,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144934692","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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