Journal of High Energy Astrophysics最新文献

{"title":"Reheating in a non-minimal tachyon cosmic inflation","authors":"Mozhdeh Bitaj,&nbsp;Kourosh Nozari","doi":"10.1016/j.jheap.2025.100542","DOIUrl":"10.1016/j.jheap.2025.100542","url":null,"abstract":"<div><div>We study the reheating process in a non-minimal Tachyon inflation with three potentials: exponential potential <span><math><mrow><mi>V</mi><mrow><mo>(</mo><mi>ϕ</mi><mo>)</mo></mrow><mo>=</mo><msup><mi>M</mi><mn>4</mn></msup><mi>exp</mi><mrow><mo>(</mo><mo>−</mo><mfrac><mi>α</mi><msub><mi>M</mi><mrow><mi>p</mi><mi>l</mi></mrow></msub></mfrac><mi>ϕ</mi><mo>)</mo></mrow></mrow></math></span>, inverse power law potential <span><math><mrow><mi>V</mi><mrow><mo>(</mo><mi>ϕ</mi><mo>)</mo></mrow><mo>=</mo><mstyle><mfrac><mi>λ</mi><mrow><mn>1</mn><mo>+</mo><msup><mi>ϕ</mi><mn>4</mn></msup></mrow></mfrac></mstyle></mrow></math></span> and inverse Cosh potential <span><math><mrow><mi>V</mi><mrow><mo>(</mo><mi>ϕ</mi><mo>)</mo></mrow><mo>=</mo><mstyle><mfrac><mi>λ</mi><mrow><mi>cosh</mi><mi>ϕ</mi></mrow></mfrac></mstyle></mrow></math></span>. We constrain these models in confrontation with Planck2018 TT, TE, EE+lowE+lensing+BK14(18)+BAO+DESI2024+Union3 joint data and also the latest results from the Atacama Cosmology Telescope (ACT) dataset. In this comparison, we identify an appropriate observational range for the non-minimal coupling parameter <em>ξ</em> for the exponential potential parameter <em>α</em> ∈ [0.1, 1], inverse power law, and inverse Cosh potentials. A successful reheating stage with acceptable reheating number of e-folds, <em>N_re</em>, and reheating temperature, <em>T_re</em>, happens in the exponential potential model for <em>α</em> ∈ [0.2, 0.6] as well as the two models mentioned above, all with the equation of state parameter <span><math><mrow><mi>ω</mi><mo>=</mo><mn>1</mn></mrow></math></span>.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"51 ","pages":"Article 100542"},"PeriodicalIF":10.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145884290","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}

{"title":"Investigating optical and ring-down gravitational wave properties of a rotating black hole in a Dehnen galactic dark matter halo","authors":"Mrinnoy M. Gohain ,&nbsp;Dhruba Jyoti Gogoi ,&nbsp;Kalyan Bhuyan ,&nbsp;Prabwal Phukon","doi":"10.1016/j.jheap.2025.100539","DOIUrl":"10.1016/j.jheap.2025.100539","url":null,"abstract":"<div><div>We present a comprehensive study of the optical and dynamical properties of a rotating black hole immersed in a Dehnen-type (1,4,0) galactic dark matter halo, modelled by a double power-law density profile commonly used to describe realistic galactic cores. By extending our previous Schwarzschild-Dehnen solution using a modified Newman-Janis algorithm, we construct a Kerr-like axisymmetric spacetime that smoothly incorporates both black hole rotation and the influence of the surrounding dark matter halo. We systematically investigate the effects of the halo parameters-the central density and halo radius-on horizon structure, the shape and extent of the ergoregion, and the null geodesics associated with black hole shadows. Our results show that the presence of a dense or extended halo expands the event horizon and ergoregion, and significantly alters the size and distortion of the black hole shadow. Furthermore, by applying the WKB approximation to scalar field perturbations, we compute the quasinormal mode (QNM) spectra and demonstrate that the frequencies and damping times of ringdown signals are highly sensitive to the halo profile. These results open promising avenues for probing the dark matter environment of astrophysical black holes through black hole imaging and gravitational wave observations.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"51 ","pages":"Article 100539"},"PeriodicalIF":10.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145884292","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}

{"title":"Einstein Probe discovery of an X-ray flare from K-type star PM J23221-0301","authors":"Guoying Zhao ,&nbsp;Weikang Zheng ,&nbsp;Rong-Feng Shen ,&nbsp;Qingcang Shui ,&nbsp;Dongyue Li ,&nbsp;Chang Zhou ,&nbsp;Tianci Zheng ,&nbsp;Weimin Yuan ,&nbsp;HeYang Liu ,&nbsp;Junfeng Wang ,&nbsp;Alexei V. Filippenko ,&nbsp;Thomas G. Brink ,&nbsp;Chong Ge ,&nbsp;Jordan Forman ,&nbsp;Mayra Gutierrez ,&nbsp;Isabelle Jones ,&nbsp;Ravjit Kaur ,&nbsp;Naunet Leonhardes-Barboza ,&nbsp;Petra Mengistu ,&nbsp;Avi Patel ,&nbsp;Michele N. Woodland","doi":"10.1016/j.jheap.2025.100537","DOIUrl":"10.1016/j.jheap.2025.100537","url":null,"abstract":"<div><div>Stellar flares are an intense stellar activity that can significantly impact the atmospheric composition of the surrounding planets and even the possible existence of life. During such events, the radiative energy of the star is primarily concentrated in the optical and X-ray bands, with the X-ray flux potentially increasing by tens or even hundreds of times. Einstein Probe (EP) detected a new X-ray transient EP J2322.1–0301 on 27 September 2024. Its spatial localization shows a high positional coincidence with the nearby high proper motion K-type star PM J23221–0301. Follow-up X-ray observations confirmed the flux enhancement of the source, while optical spectroscopic monitoring revealed time-variable features, particularly the disappearance of the H<em>α</em> emission line. This X-ray flare is consistent with a characteristic fast-rise-exponential-decay (FRED) light curve, with a rise timescale of 1.4 ks, a decay timescale of 5.7 ks, and a total duration of  ∼  7.1 ks. The peak luminosity in the 0.5–4.0 keV energy band reached  ∼ 1.3 × 10³¹ erg s<span><math><msup><mrow></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span>, with a total energy release of  ∼ 9.1 × 10³⁴ erg, consistent with the empirical energy correlations observed in magnetic-reconnection-driven stellar flares, as inferred from the multitemperature plasma structure and H<em>α</em>-X-ray energy correlation. This discovery underscores EP’s capability in understanding stellar magnetic activity via observing stellar transients.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"51 ","pages":"Article 100537"},"PeriodicalIF":10.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145938401","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}

{"title":"Observational constraints on New Tsallis holographic energy in Rastall theory","authors":"N. Sadeghnezhad ,&nbsp;R. Jalalzadeh ,&nbsp;Z. Davari ,&nbsp;B. Afshar","doi":"10.1016/j.jheap.2026.100553","DOIUrl":"10.1016/j.jheap.2026.100553","url":null,"abstract":"<div><div>The cosmological implications of New Tsallis holographic dark energy (NTHDE) in Rastall theory have been studied. Using the data set that includes DESI BAO (DR2), PantheonPlus SNe Ia, <em>H</em>(<em>z</em>) measurements, and BBN and the MCMC analysis, the key cosmological and model-specific parameters are constrained. The result is compared with that of the ΛCDM model indicating that in addition to providing a viable dynamical dark energy framework, predictions for <em>H</em>(<em>z</em>) are slightly more consistent with intermediate-redshift observations. Generally, the model remains compatible with current data and offers testable deviations from ΛCDM for upcoming surveys. It is also seen that when the energy density of quantum fields in vacuum, exposed by NTHDE, is combined with the Rastall correction term to the general relativity, a plausible candidate for dynamical dark energy is obtained that mimic the current value of the dark energy density parameter reported in the ΛCDM model. The latter cannot be repeated by NTHDE alone. Although NTHDE is not always classically stable, dynamical stability analysis reveals a stable de-Sitter fate for the Cosmos. The study also confirms previous theoretical and observational constraints on the Rastall parameter obtained by focusing on the thermodynamics, early universe, pulsars, and the early-type galaxies.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"51 ","pages":"Article 100553"},"PeriodicalIF":10.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146077365","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}

{"title":"Testing quantum-corrected black hole through particle dynamics and S2 star observations","authors":"Bakhodirkhon Saidov ,&nbsp;Bakhtiyor Narzilloev ,&nbsp;Ahmadjon Abdujabbarov ,&nbsp;Ibrar Hussain ,&nbsp;Bobomurat Ahmedov ,&nbsp;Chengxun Yuan ,&nbsp;Chen Zhou","doi":"10.1016/j.jheap.2025.100543","DOIUrl":"10.1016/j.jheap.2025.100543","url":null,"abstract":"<div><div>We investigate particle dynamics and observational signatures in the spacetime of a charged black hole arising from effective quantum gravity. Starting from the geodesic motion of neutral particles, we derive the equations of motion and analyze the impact of quantum corrections on the effective potential, the stability of circular orbits, and the innermost stable circular orbit (ISCO). The results show that quantum effects can significantly shift the ISCO radius and alter orbital stability compared to the Schwarzschild case. The analysis is further extended to the motion of charged particles in the presence of an external magnetic field, revealing strong dependencies on the sign and magnitude of the particle’s charge. The Lorentz force is found to modify the ISCO location and allow for trapping or escape trajectories, highlighting the importance of electromagnetic interactions in realistic astrophysical environments. Finally, by performing a MCMC fitting to the orbital motion of the S2 star around Sgr A*, we constrain the black hole parameters and find them consistent with current observational bounds. Our results suggest that quantum corrected charged black holes can imprint measurable effects on particle dynamics, offering potential tests of alternative gravity models through high-precision astrophysical observations.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"51 ","pages":"Article 100543"},"PeriodicalIF":10.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145976508","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}

{"title":"Challenging ΛCDM with higher-order GUP corrections","authors":"Andronikos Paliathanasis ,&nbsp;Genly Leon ,&nbsp;Yoelsy Leyva ,&nbsp;Giuseppe Gaetano Luciano ,&nbsp;Amare Abebe","doi":"10.1016/j.jheap.2025.100533","DOIUrl":"10.1016/j.jheap.2025.100533","url":null,"abstract":"<div><div>We study quantum corrections to the ΛCDM model arising from a minimum measurable length in Heisenberg’s uncertainty principle. We focus on a higher-order Generalized Uncertainty Principle, beyond the quadratic form. This generalized GUP introduces two free parameters, and we determine the modified Friedmann equation. This framework leads to a perturbative cosmological model that naturally reduces to ΛCDM in an appropriate limiting case of the deformation parameters. We construct the modified cosmological scenario, analyze its deviations from the standard case, and examine it as a mechanism for the description of dynamical dark energy. To constrain the model, we employ Cosmic Chronometers, the latest Baryon Acoustic Oscillations from the DESI DR2 release, and Supernova data from the PantheonPlus and Union3 catalogues. Our analysis indicates that the modified GUP model is statistically competitive with the ΛCDM scenario, providing comparable or even improved fits to some of the combined datasets. Moreover, the data constrain the deformation parameter of the GUP model, with the preferred value found to be negative, which corresponds to a phantom regime in the effective dynamical dark energy description.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"51 ","pages":"Article 100533"},"PeriodicalIF":10.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145839881","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}

{"title":"Slow–fast evolution of scalar fields in higher-order cosmological gravity dynamics inspired by the Pais–Uhlenbeck oscillator","authors":"Manuel Gonzalez-Espinoza ,&nbsp;Genly Leon ,&nbsp;Yoelsy Leyva ,&nbsp;Giovanni Otalora ,&nbsp;Andronikos Paliathanasis ,&nbsp;Aleksander Kozak","doi":"10.1016/j.jheap.2025.100517","DOIUrl":"10.1016/j.jheap.2025.100517","url":null,"abstract":"<div><div>We study scalar field cosmologies in higher-order gravity, inspired by the Pais–Uhlenbeck oscillator, which admits a fourth-order ghost-free sector. By recasting the equations as a slow–fast system, we analyze phase-space evolution under exponential, power-law, and arbitrary potentials using both analytical and geometric methods. The full system exhibits a rational structure with singular surfaces and, under a slow manifold constraint, reduces to a regular four-dimensional form that supports global analysis and perturbative stability. The <span><math><mi>f</mi></math></span>-deviser technique reconstructs potential-adapted functions <span><math><mrow><mi>f</mi><mo>(</mo><mi>λ</mi><mo>)</mo></mrow></math></span>, enabling attractor classification and center manifold analysis. Two-field extensions yield scaling laws and tracking behavior in the quintom regime. In the quintessence regime, we examine de Sitter stability, incorporating radiation and dust to model realistic transitions, and derive analytic expressions for <span><math><msub><mi>n</mi><mi>s</mi></msub></math></span> and <span><math><mi>r</mi></math></span> across reconstructed inflationary potentials-obtained from standard, Gaussian, hybrid, extended, and logarithmic expansions of the scale factor-with a scalar field evolving linearly in time. Our results confirm the viability of Pais–Uhlenbeck scalar models for inflation and dark energy, offering tools to study attractors and bifurcations in higher-derivative cosmology.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"51 ","pages":"Article 100517"},"PeriodicalIF":10.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145748541","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}

{"title":"Cosmological insights from an exponential Om(z) function in f(T,TG) gravity framework","authors":"Amit Samaddar,&nbsp;S. Surendra Singh","doi":"10.1016/j.jheap.2025.100495","DOIUrl":"10.1016/j.jheap.2025.100495","url":null,"abstract":"<div><div>We examine a modified teleparallel gravity model defined by <span><math><mi>f</mi><mo>(</mo><mi>T</mi><mo>,</mo><msub><mrow><mi>T</mi></mrow><mrow><mi>G</mi></mrow></msub><mo>)</mo><mo>=</mo><mi>T</mi><mo>+</mo><mi>γ</mi><msqrt><mrow><msub><mrow><mi>T</mi></mrow><mrow><mi>G</mi></mrow></msub></mrow></msqrt><mo>+</mo><mi>δ</mi><msqrt><mrow><mi>T</mi></mrow></msqrt></math></span> by introducing an exponential <span><math><mi>O</mi><mi>m</mi><mo>(</mo><mi>z</mi><mo>)</mo></math></span> diagnostic of the form <span><math><mi>O</mi><mi>m</mi><mo>(</mo><mi>z</mi><mo>)</mo><mo>=</mo><mi>α</mi><msup><mrow><mi>e</mi></mrow><mrow><mfrac><mrow><mi>z</mi></mrow><mrow><mn>1</mn><mo>+</mo><mi>z</mi></mrow></mfrac></mrow></msup><mo>+</mo><mi>β</mi></math></span>. This novel form captures smooth redshift evolution and allows for a flexible, model-independent probe of dark energy dynamics. We derive a Hubble function from this expression and use MCMC analysis with 31 CC, 26 BAO and 1701 Pantheon+ data points to constrain the model parameters. The best-fit results yield <span><math><msub><mrow><mi>H</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>∈</mo><mo>[</mo><mn>68.46</mn><mo>,</mo><mn>77.38</mn><mo>]</mo></math></span> km/s/Mpc, <span><math><mi>α</mi><mo>∈</mo><mo>[</mo><mo>−</mo><mn>0.232</mn><mo>,</mo><mo>−</mo><mn>0.068</mn><mo>]</mo></math></span> and <span><math><mi>β</mi><mo>∈</mo><mo>[</mo><mn>0.218</mn><mo>,</mo><mn>0.560</mn><mo>]</mo></math></span> which is consistent with local <span><math><msub><mrow><mi>H</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> values. Statistical model selection using AIC and BIC shows that while our model fits the data comparably to ΛCDM, AIC indicates only moderate disfavor, whereas BIC—due to its stronger penalty for additional parameters—provides strong to very strong evidence in favor of the simpler ΛCDM model. Our model predicts a transition redshift <span><math><msub><mrow><mi>z</mi></mrow><mrow><mi>t</mi><mi>r</mi></mrow></msub><mo>≈</mo><mo>(</mo><mn>0.48</mn><mo>−</mo><mn>0.54</mn><mo>)</mo></math></span>, present <span><math><msub><mrow><mi>q</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>≈</mo><mo>−</mo><mn>0.34</mn></math></span>, and <span><math><msub><mrow><mi>ω</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>≈</mo><mo>−</mo><mn>0.33</mn></math></span>. It satisfies NEC and DEC, closely tracks ΛCDM in the statefinder plane and estimates a cosmic age of <span><math><mo>(</mo><mn>13.28</mn><mo>−</mo><mn>13.87</mn><mo>)</mo></math></span> Gyr which confirms its strength in explaining late-time acceleration. Our findings demonstrate that the exponential <span><math><mi>O</mi><mi>m</mi><mo>(</mo><mi>z</mi><mo>)</mo></math></span> parameterization provides a robust and insightful approach to trace dark energy evolution within modified gravity frameworks.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"50 ","pages":"Article 100495"},"PeriodicalIF":10.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145321809","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}

{"title":"Modified cosmology through generalized mass-to-horizon entropy: Implications for structure growth and primordial gravitational waves","authors":"Giuseppe Gaetano Luciano","doi":"10.1016/j.jheap.2025.100487","DOIUrl":"10.1016/j.jheap.2025.100487","url":null,"abstract":"<div><div>In the framework of entropic cosmology, entropic forces arising at the cosmological horizon have been proposed as an alternative mechanism to explain the Universe's current accelerated phase. However, recent studies have shown that, under the Clausius relation and assuming a linear mass-to-horizon (MHR) relation, all entropic force models reduce to the original Bekenstein-Hawking formulation, regardless of the specific form of the horizon entropy. As a result, they inherit the same observational limitations in accounting for cosmic dynamics. To address this issue, a generalized MHR has been introduced, providing the foundation for a modified cosmological scenario rooted in the gravity-thermodynamics conjecture. In this work, we explore the implications of this generalized framework for early-Universe dynamics. Specifically, we analyze the growth of matter perturbations within the spherical Top-Hat formalism in the linear regime, showing that the density contrast profile is significantly influenced by the modified background dynamics predicted by the model. Moreover, considering the sensitivity of upcoming gravitational wave detectors in the sub-<span><math><msup><mrow><mn>10</mn></mrow><mrow><mn>3</mn></mrow></msup><mspace></mspace><mrow><mi>Hz</mi></mrow></math></span> range, we examine the impact on the relic abundance of Primordial Gravitational Waves (PGWs), identifying parameter regions where deviations from standard cosmology may arise through an enhanced PGW spectrum.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"50 ","pages":"Article 100487"},"PeriodicalIF":10.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222605","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}

{"title":"Dynamical dark energy from F(R) gravity models unifying inflation with dark energy: Confronting the latest observational data","authors":"S.D. Odintsov ,&nbsp;V.K. Oikonomou ,&nbsp;G.S. Sharov","doi":"10.1016/j.jheap.2025.100471","DOIUrl":"10.1016/j.jheap.2025.100471","url":null,"abstract":"<div><div>A class of viable <span><math><mi>F</mi><mo>(</mo><mi>R</mi><mo>)</mo></math></span> gravity models which can provide a unified description of inflation with the dark energy era is confronted with the latest observational data on the dark energy era. These models have the unique characteristic that the de Sitter scalaron mass in the Einstein frame counterpart theory is a monotonic function of the curvature, which renders them viable descriptions for both the inflationary and the late-time acceleration eras. We also compare these models with other well-known viable <span><math><mi>F</mi><mo>(</mo><mi>R</mi><mo>)</mo></math></span> gravity models and with the Λ-Cold-Dark-Matter model. As we show, the most phenomenologically successful models are those which deviate significantly from the Λ-Cold-Dark-Matter model. Also some of the models presented, provide a statistically favorable description of the dark energy eras, compared with the exponential <span><math><mi>F</mi><mo>(</mo><mi>R</mi><mo>)</mo></math></span> gravity model and of course compared with the Λ-Cold-Dark-Matter model. All the models we present in this article are confronted with the observational data from the Planck collaboration, the Pantheon plus data from Type Ia supernovae, the two rounds of observations of the Dark Energy Spectroscopic Instrument, data from baryon acoustic oscillations and the Hubble constant measurements. As we show, two of the models are statistically favorable by the data.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"50 ","pages":"Article 100471"},"PeriodicalIF":10.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159859","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}