Physics of the Dark Universe最新文献_第4页

Cosmological constraints on neutrino masses in a second-order CPL dark energy model 二阶CPL暗能量模型中中微子质量的宇宙学约束

IF 6.4 2区物理与天体物理

Physics of the Dark Universe Pub Date : 2026-02-01 Epub Date: 2026-01-17 DOI: 10.1016/j.dark.2026.102229

Shubham Barua, Shantanu Desai

{"title":"Cosmological constraints on neutrino masses in a second-order CPL dark energy model","authors":"Shubham Barua, Shantanu Desai","doi":"10.1016/j.dark.2026.102229","DOIUrl":"10.1016/j.dark.2026.102229","url":null,"abstract":"<div><div>Recent DESI results indicate a strong preference for dynamical dark energy (DE) when baryon acoustic oscillation (BAO) measurements are combined with supernovae (SNe) and cosmic microwave background (CMB) data using the Chevallier-Polarski-Linder (CPL) parameterization. We analyze the exponential (EXP) parameterization, which introduces a second-order correction to CPL. We determine and compare the 95% upper bounds on the sum of neutrino masses for three dark energy (DE) models—ΛCDM, CPL, and EXP—across four neutrino mass hierarchies (1 massive/2 massless, degenerate, normal, inverted) and multiple dataset combinations (CMB + BAO, CMB + BAO + PantheonPlus, CMB + BAO + DESY5), employing both Bayesian and frequentist frameworks with physical lower limits from oscillation experiments (0.059 eV and 0.11 eV). Our results show that CPL yields tighter ( ≲ 10%) bounds compared to EXP. We further confirm earlier findings that neutrino mass constraints are only mildly sensitive to the assumed hierarchy and that the frequentist bounds are tighter than Bayesian ones. Furthermore, the imposed oscillation lower limits, the datasets used and the DE parameterizations play a crucial role in the inferred cosmological neutrino mass bounds. For the datasets, hierarchies, and DE parameterizations considered, we find no statistically significant evidence for nonzero neutrino mass consistent with oscillation lower limits.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"51 ","pages":"Article 102229"},"PeriodicalIF":6.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146022821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Evolution of fluctuations in horizon energy and its dependence on the degrees of freedom 视界能量波动的演化及其对自由度的依赖

IF 6.4 2区物理与天体物理

Physics of the Dark Universe Pub Date : 2026-02-01 Epub Date: 2026-01-16 DOI: 10.1016/j.dark.2026.102223

Vishnu S Namboothiri , Krishna P․B․ , Adithya P․S․ , Titus K Mathew

{"title":"Evolution of fluctuations in horizon energy and its dependence on the degrees of freedom","authors":"Vishnu S Namboothiri , Krishna P․B․ , Adithya P․S․ , Titus K Mathew","doi":"10.1016/j.dark.2026.102223","DOIUrl":"10.1016/j.dark.2026.102223","url":null,"abstract":"<div><div>Taking account of the thermal nature of the Hubble horizon of the expanding universe, we analysed the evolution of relative fluctuations of horizon energy. For this analysis, we used two approaches: (i) by treating the Hubble horizon as a system in canonical ensemble, and (ii) by considering the microscopic degrees of freedom on the horizon. In both approaches, we obtained the relative fluctuations by using two different definitions of the horizon temperature; first, the Gibbons-Hawking temperature, and second, the Kodama-Hayward temperature. For a given temperature, both approaches yield the same general evolution for the fluctuations. In the asymptotic limit, the relative energy fluctuations corresponding to the Gibbons-Hawking temperature, is [ℏ<em>G</em>/2<em>π</em>]<em>H</em><sup>2</sup>, and 2/<em>N<sub>sur</sub></em> for the first and second approaches respectively. Similarly, using the Kodama-Hayward temperature, the asymptotic fluctuations are [5ℏ<em>G</em>/2<em>π</em>]<em>H</em><sup>2</sup>, and 10/<em>N<sub>sur</sub></em>. This implies that, the magnitude of the relative fluctuations of the horizon energy is higher in the case of Kodama-Hayward temperature. The inverse dependence of the fluctuation on <em>N<sub>sur</sub></em>, the number of degrees of freedom on the horizon, reflects a familiar behaviour in ordinary thermal systems: fluctuations decrease as the number of degrees of freedom increases. Notably, we also found that the relative energy fluctuations establish a connection between the Planck length scale <em>L<sub>p</sub></em>, characteristic length scale of the very early epoch of the universe, and <span><math><mrow><msqrt><mrow><mn>3</mn><mo>/</mo><mstyle><mi>Λ</mi></mstyle></mrow></msqrt><mo>,</mo></mrow></math></span> the length scale associated with the late-time accelerated phase. This relationship can offer valuable insights that could help in addressing the cosmological constant problem.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"51 ","pages":"Article 102223"},"PeriodicalIF":6.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146022825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Feasible regions of GB phenomenon in extended Proca-Nuevo gravity 扩展原新重力中GB现象的可行区域

IF 6.4 2区物理与天体物理

Physics of the Dark Universe Pub Date : 2026-02-01 Epub Date: 2026-01-09 DOI: 10.1016/j.dark.2026.102211

Abdul Malik Sultan , Abdul Jawad , Hamood Ur Rehman , N. Myrzakulov , Sanjar Shaymatov

{"title":"Feasible regions of GB phenomenon in extended Proca-Nuevo gravity","authors":"Abdul Malik Sultan , Abdul Jawad , Hamood Ur Rehman , N. Myrzakulov , Sanjar Shaymatov","doi":"10.1016/j.dark.2026.102211","DOIUrl":"10.1016/j.dark.2026.102211","url":null,"abstract":"<div><div>In this article, we investigate the gravitational baryogenesis mechanism in the framework of Extended Proca-Nuevo gravity, a theory where a massive vector field is non-minimally coupled to the curvature. This analysis is carried out for an early universe, encompassing three separate cosmological scenarios defined by power-law, exponential, and modified exponential scale factors. By deriving the modified field equations from the EPN action, we obtain precise solutions for each scale factor, including the influence of the vector field. We compute the baryon-to-entropy ratio using the gravitational baryogenesis formalism, where the baryon asymmetry arises from a dynamical coupling of the baryon current with the derivative of the Ricci scalar. Moreover, we discuss the stability of the assumed cosmological model in two different ways, the dynamical system analysis and squared speed of sound parameter. Our findings demonstrate that the baryon-to-entropy ratio is consistent with observational constraints in all scenarios, highlighting the potential of EPN gravity as a viable theory to explain the matter-antimatter asymmetry in the early universe. Moreover, stability analysis through dynamical system leads to a deSitter stability which is a trivial case while squared speed of sound gives that system is stable for all three scale factor models. The study further stresses the contribution of anisotropy and vector field dynamics to the cosmological evolution within modified gravity models.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"51 ","pages":"Article 102211"},"PeriodicalIF":6.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146022828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Asymptotic Schwarzschild solutions in f(R) gravity and their observable effects on the photon sphere of black holes f(R)引力的渐近史瓦西解及其对黑洞光子球的可观测影响

IF 6.4 2区物理与天体物理

Physics of the Dark Universe Pub Date : 2026-02-01 Epub Date: 2025-12-09 DOI: 10.1016/j.dark.2025.102189

Miguel Aparicio Resco

引用次数: 0

Thermodynamics analysis of black hole through modified entropies by applying Hawking evaporation phenomenon 用霍金蒸发现象修正熵分析黑洞热力学

IF 6.4 2区物理与天体物理

Physics of the Dark Universe Pub Date : 2026-02-01 Epub Date: 2026-01-22 DOI: 10.1016/j.dark.2026.102222

Shamaila Rani , Aneesa Majeed , Nadeem Azhar , Kuralay Yesmakhanova , Nurgissa Myrzakulov , Sanjar Shaymatov , Abdul Jawad

{"title":"Thermodynamics analysis of black hole through modified entropies by applying Hawking evaporation phenomenon","authors":"Shamaila Rani , Aneesa Majeed , Nadeem Azhar , Kuralay Yesmakhanova , Nurgissa Myrzakulov , Sanjar Shaymatov , Abdul Jawad","doi":"10.1016/j.dark.2026.102222","DOIUrl":"10.1016/j.dark.2026.102222","url":null,"abstract":"<div><div>In this work, we examine how well-known entropy corrections influence the thermodynamic evolution of black holes by employing two complementary approaches. In the first part, we incorporate an exponential modification to the area-entropy relation motivated by quantum-gravitational effects. Using this corrected entropy, we derive the corresponding mass evolution, Gibbs and Helmholtz free energies, radiation law, and specific heat within the semiclassical evaporation framework. The results show that exponential corrections suppress entropy growth at small horizon scales, reduce the energy emission rate at high temperatures, and intensify the negative specific heat, indicating enhanced thermodynamic instability near the final evaporation stage. In the second part, we explore a generalized singularity-free Helmholtz free energy model that captures non-extensive and quantum-statistical deviations from classical black-hole thermodynamics. The corrected entropy, partition function, and related thermodynamic quantities are derived and analyzed for different values of the correction parameters. The graphical behavior reveals that these generalized corrections tend to moderate evaporation, extend the lifetime of the black hole, and improve the stability of the thermodynamic phase space.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"51 ","pages":"Article 102222"},"PeriodicalIF":6.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147396036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Predictive one-zero with vanishing sub-trace texture in neutrino mass matrix in light of dark matter and neutrinoless double beta decay 基于暗物质和无中微子双β衰变的中微子质量矩阵中消失子迹织体的预测1 - 0

IF 6.4 2区物理与天体物理

Physics of the Dark Universe Pub Date : 2026-02-01 Epub Date: 2026-01-21 DOI: 10.1016/j.dark.2026.102228

Ankush Choudhary , Sangeeta Dey , Rishu Verma , Manoj Kumar , B.C. Chauhan , Mahadev Patgiri

{"title":"Predictive one-zero with vanishing sub-trace texture in neutrino mass matrix in light of dark matter and neutrinoless double beta decay","authors":"Ankush Choudhary , Sangeeta Dey , Rishu Verma , Manoj Kumar , B.C. Chauhan , Mahadev Patgiri","doi":"10.1016/j.dark.2026.102228","DOIUrl":"10.1016/j.dark.2026.102228","url":null,"abstract":"<div><div>In this work, we investigate a predictive class of neutrino mass matrices characterized by one texture zero and one vanishing sub-trace within the framework of the scotogenic model, wherein neutrino masses, dark matter, and neutrinoless double beta decay are intrinsically correlated. We analyze twelve viable texture structures—namely <em>B</em><sub>1,4,5</sub>, <span><math><msub><mi>C</mi><mrow><mn>1</mn><mo>,</mo><mn>2</mn><mo>,</mo><mo>…</mo><mo>,</mo><mn>5</mn></mrow></msub></math></span>, <em>D</em><sub>4,5</sub>, and <em>F</em><sub>5,6</sub>—and examine their implications for the effective Majorana mass (|<em>M<sub>ee</sub></em>|) governing neutrinoless double beta decay (0<em>νββ</em>). Remarkably, all non-zero entries of the neutrino mass matrix can be parametrized in terms of this effective Majorana mass, establishing a direct theoretical link between low-energy observables and high-scale parameters of the model. Among the twelve textures, eleven predict dark matter masses of order TeV and yield correlated bounds on |<em>M<sub>ee</sub></em>|—making them testable in current and forthcoming 0<em>νββ</em> experiments—while the textures <em>D</em><sub>4</sub> and <em>F</em><sub>5,6</sub> exhibit comparatively weaker correlations. In contrast, the texture <em>C</em><sub>5</sub> is excluded due to its requirement of unrealistically large Yukawa couplings and its inability to realize dark matter in the TeV regime. Our analysis thus identifies a subset of predictive neutrino mass textures that consistently relate dark matter phenomenology and neutrinoless double beta decay observables within the scotogenic paradigm.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"51 ","pages":"Article 102228"},"PeriodicalIF":6.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146077977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Implications of f(R) gravity on late-time cosmic structure growth through a complete description of density perturbations 通过对密度微扰的完整描述，f(R)引力对后期宇宙结构增长的影响

IF 6.4 2区物理与天体物理

Physics of the Dark Universe Pub Date : 2026-02-01 Epub Date: 2026-01-19 DOI: 10.1016/j.dark.2026.102232

Miguel Barroso Varela , Álvaro de la Cruz-Dombriz

{"title":"Implications of f(R) gravity on late-time cosmic structure growth through a complete description of density perturbations","authors":"Miguel Barroso Varela , Álvaro de la Cruz-Dombriz","doi":"10.1016/j.dark.2026.102232","DOIUrl":"10.1016/j.dark.2026.102232","url":null,"abstract":"<div><div>We provide insight about the full form of the equations for matter density perturbations and the scalar Bardeen metric potentials in general <em>f</em>(<em>R</em>) theories of gravity. When considering viable modifications to the standard ΛCDM background, the full scale-dependent equations for the metric perturbations are provided and are shown to match the ones obtained with the quasistatic approximation. We investigate the impact of the <span><math><mrow><mi>n</mi><mo>=</mo><mn>2</mn></mrow></math></span> Hu-Sawicki model on the late-time growth of structures. We find that updated late-time growth of structure data imposes <span><math><mrow><mrow><mo>|</mo></mrow><msub><mi>f</mi><msub><mi>R</mi><mn>0</mn></msub></msub><mrow><mo>|</mo><mo>≲</mo></mrow><msup><mn>10</mn><mrow><mo>−</mo><mn>6</mn></mrow></msup><mo>−</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>5</mn></mrow></msup></mrow></math></span> and thus conclude that the Hu-Sawicki <em>f</em>(<em>R</em>) model contributes no significant phenomenology at both background and perturbative level beyond the effective cosmological constant encompassed in its definition. This conclusion points to the survival of the present tension between early and late measurements of <em>σ</em><sub>8</sub>, as the Hu-Sawicki model can only worsen this issue or at best reproduce the results from the current concordance cosmological model. The generalized perturbative method showcased in this work can be applied to more elaborate <em>f</em>(<em>R</em>) models to isolate genuine higher-order signatures beyond the quasistatic approximation.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"51 ","pages":"Article 102232"},"PeriodicalIF":6.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146022823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Parameter extraction of the stochastic gravitational wave background with peak-like templates in millihertz 以毫赫为单位的类峰模板随机引力波背景参数提取

IF 6.4 2区物理与天体物理

Physics of the Dark Universe Pub Date : 2026-02-01 Epub Date: 2026-01-14 DOI: 10.1016/j.dark.2026.102217

Heng-Sen Jiao , Hong-Bo Jin , Yun-Long Zhang

{"title":"Parameter extraction of the stochastic gravitational wave background with peak-like templates in millihertz","authors":"Heng-Sen Jiao , Hong-Bo Jin , Yun-Long Zhang","doi":"10.1016/j.dark.2026.102217","DOIUrl":"10.1016/j.dark.2026.102217","url":null,"abstract":"<div><div>We investigate a framework for extracting parameters of stochastic gravitational wave background (SGWB) with peak-like templates in the millihertz frequency band, and we analyze transient contamination effects on parameter reconstruction. We present the spectrum and spectrogram under different conditions and provide the results of parameter reconstruction. Using templates from the early universe, we demonstrate that the peak-like templates outperform the broken power law (BPL) templates in power-law exponents recovery and peak frequency localization. The reconstruction results obtained using data from Fast Fourier Transform (FFT) are better than those obtained using data from Short-Time Fourier Transform (STFT) which is based on the spectrogram. For the single-peak(SP) template, the estimation accuracy of the exponent and peak frequency surpasses that of the BPL template by an order of magnitude, but it demonstrates less precision in amplitude estimation compared to the BPL template. Regarding the double-peak template, parameter estimation results derived from the FFT methodology consistently outperform those obtained using STFT. Nevertheless, transient signals exhibit a detrimental impact on parameter estimation precision, causing errors to increase by an order of magnitude, particularly in multi-peak scenarios. This framework provides an example of using templates to analyze data from space-based gravitational wave detectors.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"51 ","pages":"Article 102217"},"PeriodicalIF":6.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146022827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Massive-photon electrodynamics and MHD in curved spacetime and cosmology 弯曲时空和宇宙学中的大质量光子电动力学和MHD

IF 6.4 2区物理与天体物理

Physics of the Dark Universe Pub Date : 2026-02-01 Epub Date: 2025-12-20 DOI: 10.1016/j.dark.2025.102192

Hyerim Noh , Jai-chan Hwang

引用次数: 0

Thermodynamic signatures of non-Abelian dilaton black holes 非阿贝尔膨胀黑洞的热力学特征

IF 6.4 2区物理与天体物理

Physics of the Dark Universe Pub Date : 2026-02-01 Epub Date: 2025-12-20 DOI: 10.1016/j.dark.2025.102197

Ankit Anand , Aditya Singh , Saeed Noori Gashti , Behnam Pourhassan

{"title":"Thermodynamic signatures of non-Abelian dilaton black holes","authors":"Ankit Anand , Aditya Singh , Saeed Noori Gashti , Behnam Pourhassan","doi":"10.1016/j.dark.2025.102197","DOIUrl":"10.1016/j.dark.2025.102197","url":null,"abstract":"<div><div>We investigate the thermodynamic extremality, topological charge structure, and thermodynamic curvature of non-Abelian dilaton black holes. The dilaton coupling significantly alters thermodynamic properties, enabling the verification of extremality conditions. By analyzing normalized thermodynamic vector fields, we classify topological charges through the identification of critical zero points, with their stability confirmed via winding number analysis. These topological sectors vary distinctly with the dilaton parameter. The free energy landscape is interpreted as a scalar field over parameter space, with its extrema corresponding to topological phases. This allows consistent charge assignments aligned with known solutions, such as the AdS Reissner-Nordström black hole. We further explore the topology of photon spheres and demonstrate their crucial role in black hole stability, establishing a strong link between thermodynamic topology and spacetime geometry. Finally, thermodynamic curvature is used to probe microscopic interactions, revealing predominantly attractive behavior with possible repulsive transitions near criticality. Our results indicate a rich phase structure and a non-trivial microstructure shaped by the interplay of dilaton and non-Abelian gauge fields.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"51 ","pages":"Article 102197"},"PeriodicalIF":6.4,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145926346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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