Annals of Physics最新文献

Quantum phases in a Bose–Einstein condensate loaded in two crossed high-finesse optical cavities with orthogonal polarizations 在两个正交偏振的交叉高精细光学腔中加载玻色-爱因斯坦凝聚体中的量子相

IF 3 3区物理与天体物理

Annals of Physics Pub Date : 2025-10-01 DOI: 10.1016/j.aop.2025.170237

Zhao-Di Wu, Wei Qin, Dong-Chen Zheng, Yuan-Hong Chen, Renyuan Liao

{"title":"Quantum phases in a Bose–Einstein condensate loaded in two crossed high-finesse optical cavities with orthogonal polarizations","authors":"Zhao-Di Wu, Wei Qin, Dong-Chen Zheng, Yuan-Hong Chen, Renyuan Liao","doi":"10.1016/j.aop.2025.170237","DOIUrl":"10.1016/j.aop.2025.170237","url":null,"abstract":"<div><div>We consider a Bose–Einstein condensate (BEC) coupled to two crossed optical cavities with orthogonal polarization modes via the scalar and vectorial polarizabilities of the atoms. We determine the ground-state phase diagram and investigate the behaviors of superradiant order parameters and the photon numbers in both cavities under various conditions. With the set parameters, we find that the system accommodates three distinct phases: a normal phase with no photons in both cavities (<span><math><mi>NP</mi></math></span>), a superradiant phase with photons only in cavity 1 (<span><math><msub><mrow><mi>SR</mi></mrow><mrow><mn>1</mn></mrow></msub></math></span>) and a superradiant phase with photons in both cavities (<span><math><msub><mrow><mi>SR</mi></mrow><mrow><mn>12</mn></mrow></msub></math></span>). We explore the effects of the coupling angle on the phase boundaries under different magnitudes of cavity detuning in the two cavities. We find that the coupling angle strongly modifies the boundary between <span><math><msub><mrow><mi>SR</mi></mrow><mrow><mn>1</mn></mrow></msub></math></span> and <span><math><msub><mrow><mi>SR</mi></mrow><mrow><mn>12</mn></mrow></msub></math></span>. In particular, when the coupling angle is equal to <span><math><mrow><mn>90</mn><mo>°</mo></mrow></math></span>, the phase of <span><math><msub><mrow><mi>SR</mi></mrow><mrow><mn>12</mn></mrow></msub></math></span> is completely suppressed.</div></div>","PeriodicalId":8249,"journal":{"name":"Annals of Physics","volume":"482 ","pages":"Article 170237"},"PeriodicalIF":3.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145217180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 FJNW metric 加速FJNW度量

IF 3 3区物理与天体物理

Annals of Physics Pub Date : 2025-09-29 DOI: 10.1016/j.aop.2025.170239

Homayon Anjomshoa, Behrouz Mirza, Alireza Azizallahi

引用次数: 0

Dynamics of warm inflation in Rastall gravity 拉斯托引力中的热暴胀动力学

IF 3 3区物理与天体物理

Annals of Physics Pub Date : 2025-09-23 DOI: 10.1016/j.aop.2025.170232

Ines G. Salako , Isaac M. Vitohekpon , Ferdinan Mavoa , V.A. Monwanou

引用次数: 0

Long-lived quasinormal modes of brane-localized Reissner–Nordström–de Sitter black holes 膜定域Reissner-Nordström-de Sitter黑洞的长寿命准正态模式

IF 3 3区物理与天体物理

Annals of Physics Pub Date : 2025-09-23 DOI: 10.1016/j.aop.2025.170238

Zainab Malik

引用次数: 0

Second-order approximation of Nojiri–Odintsov infrared cutoff through heuristic expansion: A refined framework for holographic dark energy dynamics with Ricci–Gauss–Bonnet form 通过启发式展开Nojiri-Odintsov红外截止的二阶逼近：Ricci-Gauss-Bonnet形式全息暗能量动力学的一个改进框架

IF 3 3区物理与天体物理

Annals of Physics Pub Date : 2025-09-22 DOI: 10.1016/j.aop.2025.170220

Aziza Altaibayeva , Assem Assetkhan , Surajit Chattopadhyay

{"title":"Second-order approximation of Nojiri–Odintsov infrared cutoff through heuristic expansion: A refined framework for holographic dark energy dynamics with Ricci–Gauss–Bonnet form","authors":"Aziza Altaibayeva , Assem Assetkhan , Surajit Chattopadhyay","doi":"10.1016/j.aop.2025.170220","DOIUrl":"10.1016/j.aop.2025.170220","url":null,"abstract":"<div><div>This work presents a unified treatment of Nojiri–Odintsov holographic dark energy, encompassing its Ricci–Gauss–Bonnet realization and a second-order approximation as a particular case of the generalized framework. By incorporating higher-order curvature corrections from the Gauss–Bonnet invariant and the Ricci scalar, we construct an extended HDE model and study the evolution of the equation-of-state parameter in both interacting and non-interacting scenarios. The analysis reveals possible quintessence-to-phantom transitions, with observational validation from cosmic chronometer and <em>Planck</em> 2018 datasets. The outcomes indicate the role of higher-curvature corrections provide a viable description of late-time cosmic acceleration. Finally, within the Ricci–Gauss–Bonnet and Nojiri–Odintsov holographic frameworks, we find that the reconstructed <span><math><mrow><msub><mrow><mi>w</mi></mrow><mrow><mi>tot</mi></mrow></msub><mrow><mo>(</mo><mi>z</mi><mo>)</mo></mrow></mrow></math></span> exhibits the DESI-preferred quintessence–phantom crossing, although the Hubble tension between <em>Planck</em> and SH0ES determinations of <span><math><msub><mrow><mi>H</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> remains unresolved.</div></div>","PeriodicalId":8249,"journal":{"name":"Annals of Physics","volume":"482 ","pages":"Article 170220"},"PeriodicalIF":3.0,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Entanglement generation between Unruh–DeWitt detectors in the de Sitter spacetime — Analysis with complex scalar fields de Sitter时空中Unruh-DeWitt探测器之间的纠缠产生-复标量场分析

IF 3 3区物理与天体物理

Annals of Physics Pub Date : 2025-09-19 DOI: 10.1016/j.aop.2025.170235

Shagun Kaushal , Sourav Bhattacharya

{"title":"Entanglement generation between Unruh–DeWitt detectors in the de Sitter spacetime — Analysis with complex scalar fields","authors":"Shagun Kaushal , Sourav Bhattacharya","doi":"10.1016/j.aop.2025.170235","DOIUrl":"10.1016/j.aop.2025.170235","url":null,"abstract":"<div><div>We investigate the entanglement generation or harvesting between two identical, comoving Unruh–DeWitt detectors in the cosmological de Sitter spacetime. The detectors are assumed to be unentangled initially. They are individually coupled to a complex scalar field, which eventually leads to coupling between themselves. Two kinds of complex scalar fields are investigated here — conformally invariant and massless minimally coupled. By tracing out the degrees of freedom corresponding to the scalar, we construct the reduced density matrix for the two detectors, whose eigenvalues characterise transition probabilities between the energy levels of the detectors. We have computed the negativity, quantifying the degree of entanglement generated at late times between the two detectors. The similarities and differences of these results between the aforementioned two kinds of scalar fields have been discussed. We also compare our results with the existing result of the real scalar field, and point out the qualitative differences. In particular, we emphasise that entanglement harvesting is more resilient in scenarios involving complex fields and nonlinear couplings.</div></div>","PeriodicalId":8249,"journal":{"name":"Annals of Physics","volume":"482 ","pages":"Article 170235"},"PeriodicalIF":3.0,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145099782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Gauge symmetry and partially Lagrangian systems 规范对称与部分拉格朗日系统

IF 3 3区物理与天体物理

Annals of Physics Pub Date : 2025-09-18 DOI: 10.1016/j.aop.2025.170236

S.L. Lyakhovich, N.A. Sinelnikov

{"title":"Gauge symmetry and partially Lagrangian systems","authors":"S.L. Lyakhovich, N.A. Sinelnikov","doi":"10.1016/j.aop.2025.170236","DOIUrl":"10.1016/j.aop.2025.170236","url":null,"abstract":"<div><div>We consider a classical field theory whose equations of motion follow from the least action principle, but the class of admissible trajectories is restricted by differential equations. The key element of the proposed construction is the complete gauge symmetry of these additional equations. The unfree variation of the trajectories reduces to the infinitesimal gauge symmetry transformation of the equations restricting the trajectories. We explicitly derive the equations that follow from the requirement that this gauge variation of the action vanishes. The system of equations for conditional extrema is not a Lagrangian system as such, but it admits an equivalent Hamiltonian formulation with a non-canonical Poisson bracket. The bracket is degenerate, in general. Alternatively, the equations restricting the dynamics could be added to the action with Lagrange multipliers with unrestricted variation of the original variables. In this case, we would arrive at the Lagrangian equations for the original variables involving Lagrange multipliers and for Lagrange multipliers themselves. In general, these two methods are not equivalent because the multipliers can bring extra degrees of freedom compared to the case of equations derived by unfree variation of the action. We illustrate the general method with two examples. The first example is a particle in a central field with varying trajectories restricted by the equation of conservation of angular momentum. The phase space acquires one more dimension, and there is an extra conserved quantity <span><math><mi>K</mi></math></span> which is responsible for the precession of trajectories. <span><math><mrow><mi>K</mi><mo>=</mo><mn>0</mn></mrow></math></span> corresponds to the trajectories of usual Lagrangian dynamics. The second example is linearized gravity with the Einstein–Hilbert action, and the class of varying fields is restricted by the linearized Nordström equation. This conditional extrema problem is shown to lead to the linearized Cotton gravity equations.</div></div>","PeriodicalId":8249,"journal":{"name":"Annals of Physics","volume":"482 ","pages":"Article 170236"},"PeriodicalIF":3.0,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Anisotropic modifications of Gravitational dynamics: Implications for singularity and Cosmic No-Hair theorem via Raychaudhuri equation 引力动力学的各向异性修正：通过Raychaudhuri方程对奇点和宇宙无毛定理的启示

IF 3 3区物理与天体物理

Annals of Physics Pub Date : 2025-09-18 DOI: 10.1016/j.aop.2025.170230

Madhukrishna Chakraborty , Subenoy Chakraborty

{"title":"Anisotropic modifications of Gravitational dynamics: Implications for singularity and Cosmic No-Hair theorem via Raychaudhuri equation","authors":"Madhukrishna Chakraborty , Subenoy Chakraborty","doi":"10.1016/j.aop.2025.170230","DOIUrl":"10.1016/j.aop.2025.170230","url":null,"abstract":"<div><div>The paper deals with the modified Raychaudhuri equation (RE) and convergence of a congruence of time-like geodesics in anisotropic background. The analysis has been compared and contrasted with the isotropic case. Presence of anisotropy in early universe and its effect in the initial big-bang singularity has been discussed using the Raychaudhuri equation corresponding to shear (<span><math><mi>σ</mi></math></span>) and expansion (<span><math><mi>Θ</mi></math></span>). Further, the Harmonic oscillator form of the RE has been invoked and effect of anisotropy in convergence has been discussed. Additionally, the effect of anisotropy in determining cosmological dynamics has also been presented using the analytic solution of RE and a justification to Cosmic No Hair conjecture has been given in light of the present analysis. Finally, quantum gravitational aspects by formulating a Wheeler-DeWitt equation based on the anisotropic Raychaudhuri framework has been explored which offers a probabilistic criterion for singularity avoidance and quantum corrections to the cosmic evolution.</div></div>","PeriodicalId":8249,"journal":{"name":"Annals of Physics","volume":"482 ","pages":"Article 170230"},"PeriodicalIF":3.0,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145099716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Dark equation of state for the Gauss–Bonnet universe 高斯-邦纳宇宙的暗状态方程

IF 3 3区物理与天体物理

Annals of Physics Pub Date : 2025-09-18 DOI: 10.1016/j.aop.2025.170234

Byron P. Brassel , Sumeekha Singh , Sunil D. Maharaj

引用次数: 0

Charged anisotropic model with generalised polytropic equation of state 具有广义多向状态方程的带电各向异性模型

IF 3 3区物理与天体物理

Annals of Physics Pub Date : 2025-09-18 DOI: 10.1016/j.aop.2025.170229

D. Kileba Matondo , T.P. Mafa , S.D. Maharaj

引用次数: 0