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Precision Measurement of Gravitational Frequency Shift of Electromagnetic Signals in the RadioAstron Mission# 射电天文学家任务中电磁信号引力频移的精确测量
IF 1 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2026-03-16 DOI: 10.1134/S0202289325700483
A. V. Belonenko, V. N. Rudenko, A. V. Gusev, S. M. Popov, F. S. Gurin
{"title":"Precision Measurement of Gravitational Frequency Shift of Electromagnetic Signals in the RadioAstron Mission#","authors":"A. V. Belonenko,&nbsp;V. N. Rudenko,&nbsp;A. V. Gusev,&nbsp;S. M. Popov,&nbsp;F. S. Gurin","doi":"10.1134/S0202289325700483","DOIUrl":"10.1134/S0202289325700483","url":null,"abstract":"<p>The space radio telescope RadioAstron is a unique instrument for studying extremely weak radio signals in the centimeter and decimeter wavelength ranges [1]. Acting as the space-based baseline of an interferometer, the spacecraft has achieved a record-breaking angular resolution, opening new possibilities for investigating black holes, pulsars and the structure of the interstellar medium. A key feature of its onboard system is the use of a hydrogen frequency standard synchronized with a ground-based tracking station. The difference in gravitational potentials between the spacecraft and the ground station leads to a relativistic frequency shift [2] (RedShift effect), providing experimental confirmation of general relativity and Einstein’s equivalence principle. This study proposes methods for a high-precision measurement of this effect, based on an original Doppler shift compensation scheme [3] and statistical analysis of gravitational observation sessions. The results allow for an estimation of the cumulative violation parameter, contributing to further verification of the fundamental principles of general relativity. The paper also discusses prospects for new high-precision experiments.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"32 1","pages":"1 - 6"},"PeriodicalIF":1.0,"publicationDate":"2026-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147559368","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
Statistical Gravity, ADM Splitting, and Affine Quantization 统计重力，ADM分裂和仿射量化
IF 1 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-12-03 DOI: 10.1134/S0202289325700446
Riccardo Fantoni
{"title":"Statistical Gravity, ADM Splitting, and Affine Quantization","authors":"Riccardo Fantoni","doi":"10.1134/S0202289325700446","DOIUrl":"10.1134/S0202289325700446","url":null,"abstract":"<p>In a recent publications I proposed a new statistical theory of gravity [Riccardo Fantoni, Quantum Reports <b>6</b>, 706 (2024)], which describes fluctuations of the space-time metric through a <i>virial temperature</i>. In a succeeding publication I discussed the foundations [Riccardo Fantoni, Stats <b>8</b>, 23 (2025)] of such a theory. Here, I propose a possible way to render numerically accessible the path integral Monte Carlo computations required in the Statistical Gravity theory. This requires the use of the Arnowitt–Deser–Misner (ADM) splitting and of the Affine Quantization (AQ) method.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 4","pages":"568 - 572"},"PeriodicalIF":1.0,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145659331","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
Holographic Ricci–Gauss–Bonnet Dark Energy with Observational Constraints 具有观测约束的全息Ricci-Gauss-Bonnet暗能量
IF 1 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-12-03 DOI: 10.1134/S0202289325700410
Vipin Chandra Dubey, Anirudh Pradhan
{"title":"Holographic Ricci–Gauss–Bonnet Dark Energy with Observational Constraints","authors":"Vipin Chandra Dubey,&nbsp;Anirudh Pradhan","doi":"10.1134/S0202289325700410","DOIUrl":"10.1134/S0202289325700410","url":null,"abstract":"<p>Our study focuses on the holographic dark energy (HDE) model where the Gauss–Bonnet and Ricci invariants jointly determine the infrared cutoff. We determine which possibilities are physically plausible by examining how well the model fits the data. We challenge the cosmological model using two cosmological datasets: the Pantheon sample of Supernovae (SNIa), in conjunction with the most recent cosmic chronometer dataset, by performing Monte Carlo Markov Chain (MCMC) analyses to constrains the model parameters. The evolution of the equation of state (EoS) parameter, the deceleration parameter (DP), and the energy density parameters are thoroughly examined based on the best fit values of the model parameters. These show the typical thermal history of the universe, including the epochs of matter, radiation, and dark energy, culminating in the eventual total dominance of dark energy (DE). During the cosmological evolution, the corresponding DE EoS parameter may experience phantom divide crossing, lie in the quintessence and phantom regimes, and have an asymptotic value that is exactly equal to the cosmological-constant value. These observational datasets show a good agreement between the model and observations. The dynamical behavior of the DP explains the transition of the Gauss–Bonnet universe from decelerated to accelerated expansion. Our tools include the (<span>(omega_{D},omega_{D}^{{}^{prime}})</span>) pair, and <span>(Om(z))</span> diagnostic planes. Our results show that, across a range of model parameter values, the model displays both Chaplygin gas and quintessence behaviors in the (<span>(omega_{D},omega^{prime}_{D})</span>) planes. To set our model apart from existing DE models, we also use the <span>(Om(z))</span> diagnostic analysis.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 4","pages":"532 - 543"},"PeriodicalIF":1.0,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145659356","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
Revisiting Unimodular Quantum Cosmology 重访单模量子宇宙论
IF 1 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-12-03 DOI: 10.1134/S0202289325700367
Júlio C. Fabris, Luiz Filipe Guimarães, Nelson Pinto Neto, Mahamadou Hamani Daouda
{"title":"Revisiting Unimodular Quantum Cosmology","authors":"Júlio C. Fabris,&nbsp;Luiz Filipe Guimarães,&nbsp;Nelson Pinto Neto,&nbsp;Mahamadou Hamani Daouda","doi":"10.1134/S0202289325700367","DOIUrl":"10.1134/S0202289325700367","url":null,"abstract":"<p>Quantization of unimodular gravity in minisuperspace leads to a time evolution of states generated by the Hamiltonian, as in usual quantum mechanics. We revisit the analysis made by Unruh, extending it to phantom scalar fields. It is argued that only in this case a nontrivial evolution for the scalar field can be obtained. The behavior of the scale factor presents a bounce followed by de Sitter expansion, reproducing the quantum cosmological scenario in General Relativity when the source is given by a cosmological term described by the Schutz variable. The analysis is extended to the Brans–Dicke scalar-tensor theory.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 4","pages":"499 - 506"},"PeriodicalIF":1.0,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145659320","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
Cosmological Models Based on an Asymmetric Scalar Doublet and a Perfect Fluid 基于非对称标量重态和完美流体的宇宙学模型
IF 1 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-12-03 DOI: 10.1134/S0202289325700343
Yu. G. Ignat’ev, I. A. Kokh
{"title":"Cosmological Models Based on an Asymmetric Scalar Doublet and a Perfect Fluid","authors":"Yu. G. Ignat’ev,&nbsp;I. A. Kokh","doi":"10.1134/S0202289325700343","DOIUrl":"10.1134/S0202289325700343","url":null,"abstract":"<p>A mathematical model of the Universe evolution is constructed and investigated, based on an asymmetric doublet of classical and phantom scalar Higgs fields and a perfect fluid, both scalarly charged and neutral. The model is an extension of the scalarly charged perfect fluid model with a classical scalar Higgs singlet. The general properties of this model are studied, and its relation to the scalar neutral fluid model and the scalar vacuum model is established. A qualitative analysis of the cosmological model showed that the singular points of all three models, as well as their character, coincide. Examples of numerical integration of these models are given, confirming their theoretically established properties. It is shown that near unstable points of the model, generation of a phantom scalar field is possible.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 4","pages":"476 - 488"},"PeriodicalIF":1.0,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145659358","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
Characterizations of Generalized Quasi-Einstein Space-Times 广义拟爱因斯坦时空的刻画
IF 1 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-12-03 DOI: 10.1134/S0202289325700422
Krishnendu De, Uday Chand De, Fatemah Mofarreh
{"title":"Characterizations of Generalized Quasi-Einstein Space-Times","authors":"Krishnendu De,&nbsp;Uday Chand De,&nbsp;Fatemah Mofarreh","doi":"10.1134/S0202289325700422","DOIUrl":"10.1134/S0202289325700422","url":null,"abstract":"<p>The current article’s goal is to characterize generalized quasi-Einstein space-times. Two nontrivial examples have been provided to demonstrate the existence of such a space-time. It is shown that a generalized quasi-Einstein space-time represents a Ricci recurrent space-time, and the associated vectors are parallel. Moreover, we prove that a Ricci-symmetric generalized quasi-Einstein space-time is static. Next, we establish that a Ricci-semi-symmetric generalized quasi-Einstein space-time is a perfect fluid space-time under some restriction on the associated scalars. Moreover, we illustrate that a generalized quasi-Einstein twisted space-time becomes a perfect fluid space-time under certain condition, and also find the conditions under which this space-time represents a radiation era, a dust matter era and a dark matter era of the universe. Also, we see that <b>if</b> the space-time has a Riemann compatible (also, Weyl compatible) vector, and the space-time is purely electric. Finally, we acquire under what condition a generalized quasi-Einstein twisted space-time becomes a generalized Robertson–Walker space-time.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 4","pages":"544 - 552"},"PeriodicalIF":1.0,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145659325","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 Fundamental Role of the Hidden Mass Effect in Quasiclassical Cosmology 隐藏质量效应在准经典宇宙学中的基本作用
IF 1 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-12-03 DOI: 10.1134/S020228932570032X
V. M. Zhuravlev
{"title":"The Fundamental Role of the Hidden Mass Effect in Quasiclassical Cosmology","authors":"V. M. Zhuravlev","doi":"10.1134/S020228932570032X","DOIUrl":"10.1134/S020228932570032X","url":null,"abstract":"<p>The equations of cosmological evolution are derived based on a new quasiclassical theory of gravity, which describes the effect of hidden mass or “dark matter.” The dynamic equations correspond to classical mechanics and are Eulerian equations for a dustlike medium. It is shown that taking into account the hidden mass effect leads to Friedmann’s equations for the scale factor of the medium, similar to the equations in general relativity. A comparative analysis of the evolution equations in general relativity and in the new theory is carried out. Based on a qualitative analysis of the Friedmann equations, some possible scenarios of cyclic cosmological evolution are considered, describing all its main stages, including the first and second inflationary stages with an intermediate stage of Friedman expansion.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 4","pages":"454 - 465"},"PeriodicalIF":1.0,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145659330","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
Change in the Mass of Matter Due to the Conservation of the 4-momentum of Matter Together with the Gravitational Field 由物质的四动量守恒和引力场引起的物质质量的变化
IF 1 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-12-03 DOI: 10.1134/S0202289325700458
Radi I. Khrapko
{"title":"Change in the Mass of Matter Due to the Conservation of the 4-momentum of Matter Together with the Gravitational Field","authors":"Radi I. Khrapko","doi":"10.1134/S0202289325700458","DOIUrl":"10.1134/S0202289325700458","url":null,"abstract":"<p>An obvious but unknown fact is presented: the generally accepted conservation of the 4-momentum of matter together with the gravitational field means a violation of the conservation law for matter under gravitational interaction. It is shown that the local conservation law for matter, which is expressed by the equality to zero of the partial divergence of the energy-momentum tensor when using Galilean coordinates, is expressed by the equality to zero of the covariant divergence of the tensor density of the energy-momentum of matter when using curvilinear coordinates. And this local law ensures the validity of the integral conservation law. However, in the presence of a gravitational field, this local conservation law leads to a violation of the integral conservation law for matter. The article calculates the variable mass of an isolated body, which changes with a change in the gravitational field, and presents an expression for the conserved 4-momentum of matter together with the gravitational field.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 4","pages":"573 - 576"},"PeriodicalIF":1.0,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145659326","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{f(R)}) Gravity Model with DESI BAO Data 基于DESI BAO数据的(boldsymbol{f(R)})重力模型的观测约束
IF 1 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-12-03 DOI: 10.1134/S0202289325700434
Saurabh Verma, Archana Dixit, Anirudh Pradhan, M. S. Barak
{"title":"Observational Constraints on (boldsymbol{f(R)}) Gravity Model with DESI BAO Data","authors":"Saurabh Verma,&nbsp;Archana Dixit,&nbsp;Anirudh Pradhan,&nbsp;M. S. Barak","doi":"10.1134/S0202289325700434","DOIUrl":"10.1134/S0202289325700434","url":null,"abstract":"<p>We derive cosmological constraints for specific <span>(f(R))</span> gravity models. We focus on two models: the Hu–Sawicki model and the Starobinsky model, introducing a distortion parameter to quantify deviations from the standard <span>(Lambda)</span>CDM cosmology. Data from the Big Bang nucleosynthesis (BBN), the Dark Energy Spectroscopic Instrument (DESI), baryon acoustic oscillations (BAO), and the most recent Pantheon Plus datasets—which include Cepheid host distances and covariance from SH0ES samples—are all employed in our investigation. A minor but nonzero divergence from <span>(Lambda)</span>CDM cosmology is slightly preferred, according to the results, which are corroborated by efficient values of the Bayesian Information Criterion (BIC) and the Akaike Information Criterion (AIC). This suggests that <span>(f(R))</span> gravity aligns well with observational data and holds potential as a viable candidate for modified gravity. Additionally, the deceleration parameter for both models remains close to the corresponding value in the <span>(Lambda)</span>CDM model. The Statefinder diagnostics reveals distinct evolutionary differences between the two models, although their overall evolutionary trajectories are strikingly similar.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 4","pages":"553 - 567"},"PeriodicalIF":1.0,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145659319","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
A Novel Cosmic Framework of Interdependent Dark Matter and Holographic Dark Energy within the Bianchi Type-V Universe Bianchi v型宇宙中相互依存的暗物质和全息暗能量的新宇宙框架
IF 1 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-12-03 DOI: 10.1134/S020228932570046X
Gunjan Varshney, Anirudh Pradhan, Nasr Ahmed, Vansh Mittal
{"title":"A Novel Cosmic Framework of Interdependent Dark Matter and Holographic Dark Energy within the Bianchi Type-V Universe","authors":"Gunjan Varshney,&nbsp;Anirudh Pradhan,&nbsp;Nasr Ahmed,&nbsp;Vansh Mittal","doi":"10.1134/S020228932570046X","DOIUrl":"10.1134/S020228932570046X","url":null,"abstract":"<p>We study an anisotropic and homogeneous Bianchi type-V Universe with holographic dark energy (HDE) and interacting dark matter (DM). Solutions to the field equations have been obtained for a certain form of the deceleration parameter. As for <span>(Lambda)</span>CDM, we show that the coincidence problem disappears for a specific choice of the DM-HDE interaction. In this study, the observational data combination of OHD and JLA [Yu et al., Astrophys. J. <b>856</b>, 3 (2018)], where <span>(q_{0}=-0.52)</span> and <span>(H_{0}=69.2)</span>, have been taken into consideration. We also found that the anisotropy of the expansion tends to isotropy after some finite time. We have also explained the physical and geometric aspects of the model. The physical acceptability and stability of the model have been examined.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 4","pages":"577 - 590"},"PeriodicalIF":1.0,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145659327","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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