Physics of the Dark Universe最新文献

{"title":"Is cosmological data suggesting a nonminimal coupling between matter and gravity?","authors":"Miguel Barroso Varela,&nbsp;Orfeu Bertolami","doi":"10.1016/j.dark.2025.101861","DOIUrl":"10.1016/j.dark.2025.101861","url":null,"abstract":"<div><div>Theoretical predictions from a modified theory of gravity with a nonminimal coupling between matter and curvature are compared to data from recent cosmological surveys. We use type Ia supernovae data from the Pantheon+ sample and the recent 5-year Dark Energy Survey (DES) data release along with baryon acoustic oscillation measurements from the Dark Energy Spectroscopic Instrument (DESI) and extended Baryon Oscillation Spectroscopic Survey (eBOSS) to constrain the modified model’s parameters and to compare its fit quality to the Flat-<span><math><mi>Λ</mi></math></span>CDM model. We find moderate to strong evidence for a preference of the nonminimally coupled theory over the current standard model for all dataset combinations. Although the modified model is shown to be capable of matching early-time observations from the cosmic microwave background and late-time supernovae data, we find that there is still some incoherence with respect to the conclusions drawn from baryon acoustic oscillation observations.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101861"},"PeriodicalIF":5.0,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Extended phase space thermodynamics and critical behavior of charged AdS black holes surrounded by polytropic scalar field gas","authors":"Y. Sekhmani ,&nbsp;S.K. Maurya ,&nbsp;M.K. Jasim ,&nbsp;S.N. Gashti ,&nbsp;J. Rayimbaev ,&nbsp;B. Pourhassan","doi":"10.1016/j.dark.2025.101860","DOIUrl":"10.1016/j.dark.2025.101860","url":null,"abstract":"<div><div>By looking at the notion of polytropic structures as a scalar field gas behaving like dark energy, we derive a static spherically symmetric (SSS) charged black hole (BH) solution in the context of General Relativity (GR). In this paper, the <span><math><mrow><mi>P</mi><mo>−</mo><mi>v</mi></mrow></math></span> thermodynamic phase transition of charged anti-de Sitter (AdS) BH with a polytropic background is investigated in the perspective of extended phase space, where the negative cosmological constant operates as a pressure. It follows that the phase transition, viz., <span><math><mi>P</mi></math></span>-<span><math><mi>v</mi></math></span>, reveals that the small/large BH phase transition is identical to the van der Waals liquid/gas phase transition. Then, in <span><math><mrow><mi>P</mi><mo>−</mo><mi>v</mi></mrow></math></span> critical behavior, we proceed to describe the BH equations of state <span><math><mrow><mi>T</mi><mo>−</mo><mi>P</mi></mrow></math></span> and numerically assess the quantities in terms of the critical triplet <span><math><mrow><mo>(</mo><msub><mrow><mi>r</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>,</mo><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>,</mo><msub><mrow><mi>P</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>)</mo></mrow></math></span>. Moreover, critical exponents are specified and the findings show the scaling behavior of thermodynamic quantities close to criticality in a global order. Moreover, the application of <em>geometrothermodynamic</em> (GT) tools is essential to describe the critical phase transition points. At this point, we consider a series of GT tools, namely Weinhold, Ruppeiner, Quevedo I and II types, Hendi, Panahiyan, Eslam Panah, and Momennia (HPEM). Results are thus nontrivial, since all the GT class metrics cover, at a minimum, the physical limitation or critical point of the phase transition. Furthermore, the sparsity of Hawking radiation is another task that served to ascertain the resemblance with the blackbody radiation properties.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101860"},"PeriodicalIF":5.0,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479330","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}

{"title":"Observable signature of Dehnen-type dark matter halos via strong gravitational lensing by supermassive black holes and constraints from EHT observations","authors":"Amna Ali ,&nbsp;Niyaz Uddin Molla ,&nbsp;Sushant G. Ghosh ,&nbsp;Ammuthavali Ramasamya ,&nbsp;Ujjal Debnath","doi":"10.1016/j.dark.2025.101859","DOIUrl":"10.1016/j.dark.2025.101859","url":null,"abstract":"&lt;div&gt;&lt;div&gt;We investigate strong gravitational lensing by black holes influenced by a Dehnen-type dark matter halo, characterized by an additional parameter, the core radius &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;r&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;, and the dark matter central density &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;ρ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;, alongside the black hole mass &lt;span&gt;&lt;math&gt;&lt;mi&gt;M&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;. Our findings reveal that, for a fixed value of the dark matter central density &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;ρ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;, key parameters such as the unstable photon orbit radius &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;r&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;, critical impact parameter &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;u&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;, angular position &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;θ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;∞&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;, and angular separation &lt;span&gt;&lt;math&gt;&lt;mi&gt;S&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; increase with the growing value of the core radius &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;r&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;, while the relative magnitude &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;r&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;mi&gt;a&lt;/mi&gt;&lt;mi&gt;g&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; decreases. Conversely, for a fixed value of &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;r&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;, parameters including the unstable photon orbit radius &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;r&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;, critical impact parameter &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;u&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;, strong deflection angle &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;α&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;D&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;, angular position &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;θ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;∞&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;, angular separation &lt;span&gt;&lt;math&gt;&lt;mi&gt;S&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;, relative magnitude &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;r&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;mi&gt;a&lt;/mi&gt;&lt;mi&gt;g&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;, and the outermost Einstein ring &lt;span&gt;&lt;math&gt;&lt;msubsup&gt;&lt;mrow&gt;&lt;mi&gt;θ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;E&lt;/mi&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/math&gt;&lt;/span&gt; increase with the growing value of the dark matter central density &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;ρ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;. For Sgr A*, the outermost Einstein ring &lt;span&gt;&lt;math&gt;&lt;msubsup&gt;&lt;mrow&gt;&lt;mi&gt;θ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;E&lt;/mi&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/math&gt;&lt;/span&gt; is larger than in the case of M87*. We have calculated the time delay between two relativistic images by utilizing various supermassive black holes in nearby galaxies. It is found that the time delay under the influence of a Dehnen-type dark matter halo (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;∼&lt;/mo&gt;&lt;mn&gt;33&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;7584&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; min) is suppressed compared to the case of a Schwarzschild black hole (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;∼&lt;/mo&gt;&lt;mn&gt;38&lt;/mn&gt;&lt;m","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101859"},"PeriodicalIF":5.0,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437005","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}

{"title":"Analysing geodesic motion in Bocharova–Bronnikov–Melnikov–Bekenstein spacetime","authors":"Bobur Turimov ,&nbsp;Ozodbek Rahimov ,&nbsp;Akbar Davlataliev ,&nbsp;Pulat Tadjimuratov ,&nbsp;Mukhiddin Norkobilov ,&nbsp;Shakhzoda Rahimova","doi":"10.1016/j.dark.2025.101855","DOIUrl":"10.1016/j.dark.2025.101855","url":null,"abstract":"<div><div>In this paper, we explored novel feature of the Bocharova–Bronnikov–Melnikov–Bekenstein (BBMB) black hole by analyzing geodesic motion. We first examined its thermodynamics and showed that Hawking temperature equals to zero. We investigated motion of both massive and massless particles around the BBMB black hole and studied the characteristic radii, namely, marginally stable circular orbit (MSCO) and marginally bound orbit (MBO) for massive particles orbiting the BBMB black hole. Additionally, we found that the energy efficiency of massive particles in the BBMB spacetime can reach up to 8%. We also studied the capture cross section of massless (photon) and massive particles by the BBMB black hole. From the equations of motion, we derived the radial function crucial for determining the critical value of the impact parameter for photons and particles. Comparing these findings with the Schwarzschild spacetime, we observed significant differences in gravitational properties. Specifically, the impact parameter for a photon is smaller in the Schwarzschild field than in the BBMB field, indicating weaker gravity around the BBMB black hole, as corroborated by the closer location of the photon sphere in the BBMB spacetime. We derived explicit expressions for the pericentric precession and the deflection angle of light by the BBMB black hole, along with the trajectory of massive particles orbiting the black hole. We showed that test particles on elliptical trajectories experience pericenter shifts, with pericentric precession in the BBMB spacetime being slightly less than that predicted by Einstein’s general theory of relativity. Lastly, we studied the deflection of light rays and gravitational lensing effects by the BBMB black hole in both strong and weak field approximations, incorporating general relativistic effects from the Schwarzschild spacetime. We derived expressions for the deflection angle in first and second order approximations, and used the gravitational lensing equation to determine the magnification of primary and secondary images.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101855"},"PeriodicalIF":5.0,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479328","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}

{"title":"Anisotropic fluid dynamics with vanishing complexity and expansion-free constraints: Exploring analytical solutions in charged modified gravity","authors":"Guangjun Nan ,&nbsp;I. Sabir ,&nbsp;B. Almutairi ,&nbsp;M.Z. Bhatti ,&nbsp;Z. Yousaf","doi":"10.1016/j.dark.2025.101858","DOIUrl":"10.1016/j.dark.2025.101858","url":null,"abstract":"<div><div>In this paper, we study non-static spherically symmetric shear-free anisotropic dissipative fluid distribution coupled with Maxwell field equations to find the solutions for dynamical equations Herrera et al. (2023) in <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>)</mo></mrow></mrow></math></span> gravity and use a physically realistic model, i.e., <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>)</mo></mrow><mo>=</mo><mi>R</mi><mo>+</mo><mi>δ</mi><msup><mrow><mi>R</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span>, where <span><math><mi>R</mi></math></span> represents the Ricci scalar. We compute gravitational mass (Misner–Sharp) to explore matching conditions. We also construct conservation equations for ordinary, effective dark source terms and electromagnetic stress–energy tensors using Bianchi identities in <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>)</mo></mrow></mrow></math></span> gravity. Further, we utilize constraints like vanishing expansion scalar and complexity factor to derive exact analytical solutions for gravitational equations in <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>)</mo></mrow></mrow></math></span> gravity.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101858"},"PeriodicalIF":5.0,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419376","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}

{"title":"Primordial gravitational waves: Model effects on time evolution and spectrum","authors":"Sandro M.R. Micheletti","doi":"10.1016/j.dark.2025.101869","DOIUrl":"10.1016/j.dark.2025.101869","url":null,"abstract":"<div><div>With the detection of gravitational waves (GW) in recent years, many papers that use simulated GW datasets to constrain dark energy models have been published. However, these works generally consider GW generated by massive astrophysical objects, such as mergers of black holes or neutron stars. In this paper, we analyse the evolution and spectrum of GW generated in the inflationary epoch, assuming a standard slow-roll single-field inflationary scenario. Three models for the background are considered: a field theory model of interacting dark energy - the Interacting Holographic Tachyonic Model, the Holographic Dark Energy Model, and the ΛCDM. The results show significant dependence on the cosmological model, especially for the spectrum, and in particular show that an interaction between dark energy and dark matter can leave a significant imprint. Therefore, future primordial gravitational waves (PGW) datasets could be very useful for constraining dark energy models, including to probe an interaction in the dark sector of the universe.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101869"},"PeriodicalIF":5.0,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143465445","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}

{"title":"Gravitational waves dynamics with Higgs portal and U(1) x SU(2) interactions","authors":"Lucia A. Popa","doi":"10.1016/j.dark.2025.101854","DOIUrl":"10.1016/j.dark.2025.101854","url":null,"abstract":"<div><div>Finding the origins of the primordial Gravitational Waves (GWs) background by the near-future Cosmic Microwave Background (CMB) polarization experiments is expected to open a new window Beyond the Standard Model (BSM) of particle physics, allowing to investigate the possible connections between the Electroweak (EW) symmetry breaking scale and the energy scale of inflation. We investigate the GWs dynamics in a set-up where the inflation sector is represented by a mixture of the SM Higgs boson and an U(1) scalar singlet field non-minimally coupled to gravity and a spectator sector represented by an U(1) axion and a SU(2) non-Abelian gauge field, assuming that there is no coupling, up to gravitational interactions, between inflation and spectator sectors.</div><div>We show that a mixture of Higgs boson with a heavy scalar singlet with large vacuum expectation value (<em>vev</em>) is a viable model of inflation that satisfy the existing observational data and the perturbativity constraints, avoiding in the same time the EW vacuum metastability as long as the Higgs portal interactions lead to positive tree-level threshold corrections for SM Higgs quartic coupling. We evaluate the impact of the Higgs quartic coupling threshold corrections on the GW sourced tensor modes while accounting for the consistency and backreaction constraints and show that the Higgs portal interactions enhance the GW signal sourced by the gauge field fluctuations in the CMB B-mode polarization power spectra.</div><div>We address the detectability of the GW sourced by the gauge field fluctuations in presence of Higgs portal interactions for the experimental configuration of the future CMB polarization LiteBird space mission. We find that the sourced GW tensor-to-scalar ratio in presence of Higgs portal interactions is enhanced to a level that overcomes the vacuum tensor-to-scalar ratio by a factor <span><math><mrow><mi>O</mi><mrow><mo>(</mo><mn>10</mn><mo>)</mo></mrow></mrow></math></span>, much above the detection threshold of the LiteBird experiment, in agreement with the existing observational constraints on the curvature fluctuations and the allowed parameter space of Higgs portal interactions.</div><div>A large enhancement of the sourced GW can be also detected by experiments such as pulsar timing arrays and laser/atomic interferometers. Moreover, a significant Higgs–singlet mixing can be probed at LHC by the measurement of the production cross sections for Higgs-like states, while a significant tree level threshold correction of the Higgs quartic coupling can be measured at colliders by ATLAS and CMS experiments.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101854"},"PeriodicalIF":5.0,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403086","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}

{"title":"Gauge invariant perturbations in teleparallel Horndeski gravity","authors":"Bobomurat Ahmedov ,&nbsp;Maria Caruana ,&nbsp;Konstantinos F. Dialektopoulos ,&nbsp;Jackson Levi Said ,&nbsp;Abdurakhmon Nosirov ,&nbsp;Zinovia Oikonomopoulou ,&nbsp;Odil Yunusov","doi":"10.1016/j.dark.2025.101846","DOIUrl":"10.1016/j.dark.2025.101846","url":null,"abstract":"<div><div>We present in the form of a catalogue the cosmological perturbations within the Bahamonde–Dialektopoulos–Levi Said (BDLS) theory, which serves as the teleparallel counterpart of Horndeski gravity. To understand structure formation in cosmological models, it is essential to study both the background and perturbative aspects of their cosmology. While extensive analysis of both Horndeski gravity and its teleparallel analog exists in the literature, a quantitative understanding requires a detailed examination of their cosmological perturbations. We review here all the different gauges for the scalar, vector and tensor perturbations of a cosmological background up to second order and we hope this will help people who work with observations, to incorporate it in existing codes.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101846"},"PeriodicalIF":5.0,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal dark photon dark matter, coscattering, and long-lived ALPs","authors":"Bastián Díaz Sáez","doi":"10.1016/j.dark.2025.101852","DOIUrl":"10.1016/j.dark.2025.101852","url":null,"abstract":"<div><div>We study the thermal freeze-out of a dark photon dark matter in the so-called <em>dark-axion portal</em> - a triple coupling among a dark photon, an axion-like particle and the SM <span><math><mi>γ</mi></math></span> or <span><math><mi>Z</mi></math></span> boson. We analyze in detail the thermal production regimes: coscattering (aka conversion driven freeze-out), mediator freeze-out, and coannihilations. We found viable DM scenarios fulfilling the correct relic abundance in the three regimes. Apart of analyzing the parameter space for dark state masses between the GeV-TeV scale, we explore the prospects of having the axion-like field as a long-lived particle, possibly to be observed at the LHC and future detectors.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101852"},"PeriodicalIF":5.0,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419374","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}

{"title":"Kinetic model for dark energy—dark matter interaction: Scenario for the hubble tension","authors":"Giovanni Montani ,&nbsp;Nakia Carlevaro ,&nbsp;Luis A. Escamilla ,&nbsp;Eleonora Di Valentino","doi":"10.1016/j.dark.2025.101848","DOIUrl":"10.1016/j.dark.2025.101848","url":null,"abstract":"<div><div>We analyze a model for Dark Energy - Dark Matter interaction, based on a decaying process of the former into the latter. The dynamical equations are constructed following a kinetic formulation, which separates the interacting fluctuations from an equilibrium distribution of both species. The emerging dynamical picture consists of coupled equations, which are specialized in the case of a Dark Energy equation of state parameter; we deal with a modified Lambda Cold Dark Matter (<span><math><mi>Λ</mi></math></span>CDM) model, which is investigated versus a possible interpretation of the Hubble tension. Using an optimized set of the model’s free parameters, it can be shown that the obtained Hubble parameter can, in principle, address the tension. We then use the most recent datasets from late Universe sources and compressed information from the Cosmic Microwave Background data to constrain the free parameters and compare the addressed scenario to the standard <span><math><mi>Λ</mi></math></span>CDM model. The study outlines how our proposal is preferred by the data in all cases, based on fit quality, while also alleviating the tension.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101848"},"PeriodicalIF":5.0,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454132","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}