arXiv - PHYS - General Relativity and Quantum Cosmology最新文献_第8页

Lorentz violation with an invariant minimum speed as foundation of the uncertainty principle in Minkowski, dS and AdS spaces 作为闵科夫斯基空间、dS 空间和 AdS 空间不确定性原理基础的具有最小速度不变性的洛伦兹违反现象

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-07 DOI: arxiv-2409.04925

Cláudio Nassif Cruz

{"title":"Lorentz violation with an invariant minimum speed as foundation of the uncertainty principle in Minkowski, dS and AdS spaces","authors":"Cláudio Nassif Cruz","doi":"arxiv-2409.04925","DOIUrl":"https://doi.org/arxiv-2409.04925","url":null,"abstract":"This research aims to provide the geometrical foundation of the uncertainty\u0000principle within a new causal structure of spacetime so-called Symmetrical\u0000Special Relativity (SSR), where there emerges a Lorentz violation due to the\u0000presence of an invariant minimum speed $V$ related to the vacuum energy. SSR\u0000predicts that a dS-scenario occurs only for a certain regime of speeds $v$,\u0000where $v<v_0=sqrt{cV}$, which represents the negative gravitational potentials\u0000($Phi<0$) connected to the cosmological parameter $Lambda>0$. For $v=v_0$,\u0000Minkowski (pseudo-Euclidian) space is recovered for representing the flat space\u0000($Lambda=0$), and for $v>v_0$ ($Phi>0$), Anti-de Sitter (AdS) scenario\u0000prevails ($Lambda<0$). The fact that the current universe is flat as its\u0000average density of matter distribution ($rho_m$ given for a slightly negative\u0000curvature $R$) coincides with its vacuum energy density ($rho_{Lambda}$ given\u0000for a slightly positive curvature $Lambda$), i.e., the {it cosmic coincidence\u0000problem}, is now addressed by SSR. SSR provides its energy-momentum tensor of\u0000perfect fluid, leading to the EOS of vacuum ($p=-rho_{Lambda}$). Einstein\u0000equation for vacuum given by such SSR approach allows us to obtain\u0000$rho_{Lambda}$ associated with a scalar curvature $Lambda$, whereas the\u0000solution of Einstein equation only in the presence of a homogeneous\u0000distribution of matter $rho_m$ for the whole universe presents a scalar\u0000curvature $R$, in such a way that the presence of the background field\u0000$Lambda$ opposes the Riemannian curvature $R$, thus leading to a current\u0000effective curvature $R_{eff}=R+Lambdaapprox 0$ according to observations.","PeriodicalId":501041,"journal":{"name":"arXiv - PHYS - General Relativity and Quantum Cosmology","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Scalar-tensor theories of gravity from a thermodynamic viewpoint 从热力学角度看引力的标量张量理论

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-06 DOI: arxiv-2409.04176

Krishnakanta Bhattacharya, Sumanta Chakraborty

{"title":"Scalar-tensor theories of gravity from a thermodynamic viewpoint","authors":"Krishnakanta Bhattacharya, Sumanta Chakraborty","doi":"arxiv-2409.04176","DOIUrl":"https://doi.org/arxiv-2409.04176","url":null,"abstract":"In both general relativity and Lanczos-Lovelock theories of gravity, it has\u0000been found that the Noether charge density in any bulk region of spacetime can\u0000be interpreted as the heat content of the boundary surface. In addition, it was\u0000found that the dynamical evolution of spacetime can be interpreted as the\u0000departure from an ``equipartition\" between properly defined bulk and surface\u0000degrees of freedom. We find that the same interpretations are valid for\u0000scalar-tensor theories of gravity, in which case the gravity is mediated by the\u0000metric tensor as well as by the scalar field. Moreover, these results hold in\u0000both the frames associated with the scalar-tensor theory, namely the Jordan and\u0000the Einstein frames. However, it turns out that there are two dynamically\u0000equivalent representations of the scalar-tensor theory in the Jordan frame,\u0000differing by total derivatives in the action, which are thermodynamically\u0000inequivalent. Thus thermodynamics is sensitive to various representations of\u0000scalar-tensor theories. This not only implies the robustness of the\u0000thermodynamic description of gravity beyond general relativity, but also\u0000depicts the importance of having a thermodynamic description by distinguishing\u0000various dynamically equivalent representations.","PeriodicalId":501041,"journal":{"name":"arXiv - PHYS - General Relativity and Quantum Cosmology","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142225610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Primordial Bounce-Inflation Scenario to Alleviate Cosmological Tensions and Lensing Anomaly 缓解宇宙学张力和透镜异常的原始反弹-充气情景

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-06 DOI: arxiv-2409.04027

Hao-Hao Li, Xin-zhe Zhang, Taotao Qiu

{"title":"Primordial Bounce-Inflation Scenario to Alleviate Cosmological Tensions and Lensing Anomaly","authors":"Hao-Hao Li, Xin-zhe Zhang, Taotao Qiu","doi":"arxiv-2409.04027","DOIUrl":"https://doi.org/arxiv-2409.04027","url":null,"abstract":"We put forward a primordial scenario to alleviate cosmological tensions, i.e.\u0000Hubble ($H_0$) tension and $ S_8 $ tension. Based on flat $Lambda$CDM, the\u0000Bounce-Inflation (BI) scenario gives the results that $ H_0 =\u000068.60^{+0.40}_{-0.45} , text{km}/text{s}/text{Mpc}$, $ S_8 = 0.806 pm\u00000.011 $ by using texttt{Planck 2018} data sets and $ H_0 = 68.96 pm 0.38 ,\u0000text{km}/text{s}/text{Mpc}$, $ S_8 = 0.797pm 0.010 $ by using\u0000texttt{Planck 2018} + texttt{SPT3G} data sets. These reduce the cosmological\u0000tensions slightly. We also take an extended $Lambda$CDM model into account,\u0000$Lambda$CDM (BI)+$A_L$, where $ A_L $ is the gravitational lensing amplitude.\u0000The results are $ H_0 = 69.38 pm 0.49 , text{km}/text{s}/text{Mpc}$, $ S_8\u0000= 0.774 pm 0.014 $ fitted by texttt{Planck 2018} data sets and $ H_0 = 69.49\u0000pm 0.45 , text{km}/text{s}/text{Mpc}$, $ S_8 = 0.771^{+0.013}_{-0.012} $\u0000fitted by texttt{Planck 2018} + texttt{SPT3G} data sets, which reduce the\u0000Hubble tension to $sim 3sigma $ level and show no $S_8 $ tension. The $A_L\u0000approx 1.1$ is smaller than the result of the inflation scenario with a\u0000constraint of texttt{Planck 2018} data sets. Besides, the spectral index of\u0000the bounce-inflation scenario $ n_s $ is about $ 0.98 $, with a trend to the\u0000Harrison-Zel'dovich spectrum.","PeriodicalId":501041,"journal":{"name":"arXiv - PHYS - General Relativity and Quantum Cosmology","volume":"671 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Gravitational wave signatures and detectability of the mass transfer effect in compact binaries 紧凑双星中的引力波特征和质量转移效应的可探测性

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-06 DOI: arxiv-2409.04020

Zi-Han Zhang, Tan Liu, Shenghua Yu, Zong-Kuan Guo

{"title":"Gravitational wave signatures and detectability of the mass transfer effect in compact binaries","authors":"Zi-Han Zhang, Tan Liu, Shenghua Yu, Zong-Kuan Guo","doi":"arxiv-2409.04020","DOIUrl":"https://doi.org/arxiv-2409.04020","url":null,"abstract":"The mass transfer process is prevalent during the inspiral phase of compact\u0000binary systems. Our study focuses on systems comprising low-mass white dwarfs,\u0000particularly in neutron star-white dwarf binaries and double white dwarf\u0000binaries, where a stable mass transfer process occurs at low frequencies. By\u0000analyzing the evolution of gravitational wave frequencies in the presence of\u0000mass transfer within quasi-circular orbits, we derive an analytical expression\u0000for the time-dependent frequency across different frequency bands and the\u0000waveforms emitted by compact binaries. Considering gravitational waves emitted\u0000by compact binaries in the $1thicksim10$ mHz band, based on the Fisher\u0000analysis, we find that the mass transfer rate can be measured as accurately as\u0000$10^{-7} M_odot/text{year}$ by space-based gravitational-wave detectors with\u0000a signal-to-noise ratio of the order of $10^3$. Including the mass transfer\u0000effect in the waveforms provides a new possibility to measure the individual\u0000masses of double white dwarf binaries. The relative error of measured white\u0000dwarf masses can be down to the order of $0.01$.","PeriodicalId":501041,"journal":{"name":"arXiv - PHYS - General Relativity and Quantum Cosmology","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Physical properties and the maximum compactness bound of a class of compact stars in $f(Q)$ gravity $f(Q)$引力下一类紧凑星的物理特性和最大紧凑性约束

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-06 DOI: arxiv-2409.04487

R. Sharma, A. Ghosh, A. Paul

引用次数: 0

Equilibrium of charged fluid around a Kerr black hole immersed in a magnetic field: variation of angular momentum 浸入磁场的克尔黑洞周围带电流体的平衡：角动量的变化

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-06 DOI: arxiv-2409.04170

Audrey Trova

引用次数: 0

Charged dilatonic black holes in dilaton-massive gravity 稀拉顿-大质量引力中的带电稀拉顿黑洞

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-06 DOI: arxiv-2409.04485

Lina Zhang, Qiyuan Pan, Bo Liu, Ming Zhang, De-Cheng Zou

引用次数: 0

GLoW: novel methods for wave-optics phenomena in gravitational lensing GLoW：引力透镜中波光学现象的新方法

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-06 DOI: arxiv-2409.04606

Hector Villarrubia-Rojo, Stefano Savastano, Miguel Zumalacárregui, Lyla Choi, Srashti Goyal, Liang Dai, Giovanni Tambalo

{"title":"GLoW: novel methods for wave-optics phenomena in gravitational lensing","authors":"Hector Villarrubia-Rojo, Stefano Savastano, Miguel Zumalacárregui, Lyla Choi, Srashti Goyal, Liang Dai, Giovanni Tambalo","doi":"arxiv-2409.04606","DOIUrl":"https://doi.org/arxiv-2409.04606","url":null,"abstract":"Wave-optics phenomena in gravitational lensing occur when the signal's\u0000wavelength is commensurate to the gravitational radius of the lens. Although\u0000potentially detectable in lensed gravitational waves, fast radio bursts and\u0000pulsars, accurate numerical predictions are challenging to compute. Here we\u0000present novel methods for wave-optics lensing that allow the treatment of\u0000general lenses. In addition to a general algorithm, specialized methods\u0000optimize symmetric lenses (arbitrary number of images) and generic lenses in\u0000the single-image regime. We also develop approximations for simple lenses\u0000(point-like and singular isothermal sphere) that drastically outperform known\u0000solutions without compromising accuracy. These algorithms are implemented in\u0000Gravitational Lensing of Waves (GLoW): an accurate, flexible, and fast code.\u0000GLoW efficiently computes the frequency-dependent amplification factor for\u0000generic lens models and arbitrary impact parameters in O(1 ms) to O(10 ms)\u0000depending on the lens configuration and complexity. GLoW is readily applicable\u0000to model lensing diffraction on gravitational-wave signals, offering new means\u0000to investigate the distribution of dark-matter and large-scale structure with\u0000signals from ground and space detectors.","PeriodicalId":501041,"journal":{"name":"arXiv - PHYS - General Relativity and Quantum Cosmology","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Double-Sine-Gordon Early Universe 双正弦-戈登早期宇宙

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-06 DOI: arxiv-2409.04210

Behnoush Afshar, Marziyeh Peyravi, Kazuharu Bamba, Hooman Moradpour

引用次数: 0

Nonlinear dynamics of oscillons and transients during preheating after single field inflation 单场充气后预热期间振子和瞬态的非线性动力学

arXiv - PHYS - General Relativity and Quantum Cosmology Pub Date : 2024-09-06 DOI: arxiv-2409.04046

Tianyu Jia, Yu Sang, Xue Zhang

{"title":"Nonlinear dynamics of oscillons and transients during preheating after single field inflation","authors":"Tianyu Jia, Yu Sang, Xue Zhang","doi":"arxiv-2409.04046","DOIUrl":"https://doi.org/arxiv-2409.04046","url":null,"abstract":"In the single-field model, the preheating process occurs through\u0000self-resonance of inflaton field. We study the nonlinear structures generated\u0000during preheating in the $alpha$-attractor models and monodromy models. The\u0000potentials have a power law form $proptoleft|phiright|^{2n}$ near the\u0000origin and a flat region away from bottom, which are consistent with current\u0000cosmological observations. The Floquet analysis shows that potential parameters\u0000in monodromy model have a significant influence on the region of resonance\u0000bands. The analytical oscillons solution for the $alpha$-attractor T model\u0000with parameter $n=1$ is derived using the small amplitude analysis method.\u0000Besides we investigate the formation of nonlinear structures, the equation of\u0000state and the energy transfer through the (3+1) dimensional lattice simulation.\u0000We find that the symmetric T potential and the asymmetric E potential in the\u0000$alpha$-attractor models have similar nonlinear dynamics. And the potential\u0000parameter $n$ in monodromy model significantly influences the lifetime of\u0000transients, whereas the parameter $q$ exerts minimal impact on the nonlinear\u0000dynamics.","PeriodicalId":501041,"journal":{"name":"arXiv - PHYS - General Relativity and Quantum Cosmology","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0