Physics of the Dark Universe最新文献

{"title":"Revisiting Tilt and Tensor-to-Scalar Ratio in the Multi-Scalar Field Inflation: Non-Sum-Separable Case","authors":"Fereshteh Felegary ,&nbsp;Seyed Ali Hosseini Mansoori ,&nbsp;Tahere Fallahi Serish ,&nbsp;Phongpichit Channuie","doi":"10.1016/j.dark.2025.101924","DOIUrl":"10.1016/j.dark.2025.101924","url":null,"abstract":"<div><div>The canonical multi-scalar field inflation where the kinetic and potential terms are sum-separable is ruled out by the current observations for the chaotic-type potential <span><math><mrow><mi>V</mi><mo>=</mo><msub><mrow><mo>∑</mo></mrow><mrow><mi>i</mi></mrow></msub><msub><mrow><mi>μ</mi></mrow><mrow><mi>i</mi></mrow></msub><msubsup><mrow><mi>ϕ</mi></mrow><mrow><mi>i</mi></mrow><mrow><mi>p</mi></mrow></msubsup></mrow></math></span>. This paper explores the non-sum-separable case to validate the chaotic-type potential in the multi-scalar field, incorporating a linear coupling term between the kinetic and potential terms in the canonical Lagrangian. This coupling influences the slow-roll parameters and also alters our predictions for the spectral index <span><math><msub><mrow><mi>n</mi></mrow><mrow><mi>s</mi></mrow></msub></math></span> and the tensor-to-scalar ratio <span><math><mi>r</mi></math></span>, which directly depend on those parameters. In fact, compared to standard canonical multi-field inflation, the values of <span><math><msub><mrow><mi>n</mi></mrow><mrow><mi>s</mi></mrow></msub></math></span> and <span><math><mi>r</mi></math></span> decrease to levels consistent with the recent Planck+BICEP/Keck constraint.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101924"},"PeriodicalIF":5.0,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143878723","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":"Observational constraints in late time for an axially symmetric transitioning model with bulk viscous fluid","authors":"G.K. Goswami ,&nbsp;Anirudh Pradhan ,&nbsp;Vipin Chandra Dubey","doi":"10.1016/j.dark.2025.101934","DOIUrl":"10.1016/j.dark.2025.101934","url":null,"abstract":"<div><div>In this paper, we explore an axially symmetric Bianchi type-I model of the universe with bulk viscous fluid as a source of gravitational field under the framework of Einstein’s field equations by assuming barotropic bulk viscous pressure as <span><math><mrow><mo>−</mo><mn>3</mn><mi>ζ</mi><msup><mrow><mi>H</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span>. The model parameters have been estimated with the help of four data sets: The Hubble 46 data set describes Hubble parameter values at various redshifts, Union 2.1 compilation data sets comprise a distance modulus of 580 SNIa supernovae at different redshifts, the Pantheon data set contains Apparent magnitudes of 1048 SNIa supernovae at various redshifts and finally BAO data set of volume averaged distances at 5 redshifts. The observational data is analyzed using the traditional Bayesian methodology, and the posterior distributions of the parameters are obtained using the Markov Chain Monte Carlo (MCMC) technique. To get the best-fit values for the model parameters for MCMC analysis, we use the <span><math><mrow><mi>e</mi><mi>m</mi><mi>c</mi><mi>e</mi><mi>e</mi></mrow></math></span> package. For parameter estimation, we have also employed the minimizing <span><math><msup><mrow><mi>χ</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span> function. We also tried to achieve these values statistically using combined data sets from the four described earlier. The OHD+BAO and OHD+Pan+BAO+Union combined data sets provide the best fit Hubble parameter value <span><math><msub><mrow><mi>H</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> as <span><math><mrow><mn>66</mn><mo>.</mo><mn>91</mn><msubsup><mrow><mn>2</mn></mrow><mrow><mo>−</mo><mn>0</mn><mo>.</mo><mn>501</mn></mrow><mrow><mo>+</mo><mn>0</mn><mo>.</mo><mn>497</mn></mrow></msubsup></mrow></math></span> Km/s/Mpc and <span><math><mrow><mn>74</mn><mo>.</mo><mn>21</mn><msubsup><mrow><mn>6</mn></mrow><mrow><mo>−</mo><mn>0</mn><mo>.</mo><mn>148</mn></mrow><mrow><mo>+</mo><mn>0</mn><mo>.</mo><mn>150</mn></mrow></msubsup></mrow></math></span> Km/s/Mpc respectively. We have performed state finder diagnostics to discuss the nature of dark energy. Some other geometrical parameters like the Jerk parameter and the Om diagnostic are also being discussed to clarify the nature of the dark energy model. The study reveals that the model behaves like a quintessence in late time and approaches the <span><math><mi>Λ</mi></math></span> CDM model.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101934"},"PeriodicalIF":5.0,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143878579","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":"Constraining gluonic contact interaction of a neutrino-philic dark fermion at hadron colliders and direct detection experiments","authors":"Kai Ma,&nbsp;Lin-Yun He","doi":"10.1016/j.dark.2025.101933","DOIUrl":"10.1016/j.dark.2025.101933","url":null,"abstract":"<div><div>Weakly interacting fermions with the Standard Model particles are promising candidates for the dark matter. In this paper, we study signatures of the gluonic interactions of a dark fermion and a neutrino at hadron colliders and direct detection experiments. The lowest order interactions are described by contact operators in dimension 7. At hadron colliders, the mono-jet production is the most sensitive channel. And these operators can also induce both spin-independent and spin-dependent absorption of the dark fermion at nuclear targets. We show that for a nearly massless dark fermion, the energy scales are constrained to be higher than 500 GeV and 1.2 TeV by the current LHC and HE-LHC searches, respectively. Furthermore, we also find that almost all the parameter space accessible by the spin-independent absorption has been excluded by the current LHC constraints. In contrast, for spin-dependent absorption at light nuclear targets there is still some parameter space which cannot be reached by current and upcoming LHC searches.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101933"},"PeriodicalIF":5.0,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143878657","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":"Probing quantum gravity effects: Geodesic structure and thermodynamics of deformed Schwarzschild AdS black holes surrounded by cosmic strings","authors":"Faizuddin Ahmed ,&nbsp;Ahmad Al-Badawi ,&nbsp;İzzet Sakallı","doi":"10.1016/j.dark.2025.101925","DOIUrl":"10.1016/j.dark.2025.101925","url":null,"abstract":"<div><div>We investigate a deformed Schwarzschild anti-de Sitter black hole with a cloud of strings, performing a comprehensive analysis across three interconnected domains: geodesic structure, scalar perturbations, and thermodynamic properties. Our methodology incorporates three key parameters: the deformation parameter <span><math><mi>α</mi></math></span>, the control parameter <span><math><mi>β</mi></math></span>, and the cosmic strings (CS) parameter <span><math><mi>ζ</mi></math></span>. Through geodesic analysis, we determine the photon sphere radius and shadow cast, finding that <span><math><mi>ζ</mi></math></span> systematically increases these characteristic lengths, while <span><math><mi>α</mi></math></span> produces the opposite effect. For null geodesics, we derive the Lyapunov exponent and establish that the deformation reduces the orbital instability compared to the Letelier solution. Our investigation of scalar perturbations reveals how the combined effect of deformation and CS modifies the effective potential, with implications for black hole stability under external disturbances. The thermodynamic analysis demonstrates that deformation enables stable smaller black holes at lower temperatures, counteracting the destabilizing influence of CS. We observe a rich phase structure with three distinct regions: small black holes with negative heat capacity, intermediate black holes that are locally stable but globally unfavorable, and large black holes that achieve both local and global stability at sufficiently high temperatures. The Hawking–Page transition temperature increases with both <span><math><mi>α</mi></math></span> and <span><math><mi>ζ</mi></math></span>, though through different underlying mechanisms. These results shed light on the collective effects of quantum gravity-motivated deformations and extended structures on black hole physics.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101925"},"PeriodicalIF":5.0,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143873222","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":"Fast Radio Bursts as probes of the late-time universe: A new insight on the Hubble tension","authors":"Surajit Kalita ,&nbsp;Shruti Bhatporia ,&nbsp;Amanda Weltman","doi":"10.1016/j.dark.2025.101926","DOIUrl":"10.1016/j.dark.2025.101926","url":null,"abstract":"<div><div>Fast Radio Bursts (FRBs) are bright radio transient events, a subset of which have been localized to their host galaxies. Their high dispersion measures offer valuable insights into the ionized plasma along their line of sight, enabling them to serve as probes of cosmological parameters. One of the major challenges in contemporary cosmology is the Hubble tension — an unresolved discrepancy between two independent methods of determining the Universe’s expansion rate, yielding differing values for the Hubble constant. In this study, we analyze a sample of 64 extragalactic, localized FRBs observed by various telescopes, employing Bayesian analysis with distinct likelihood functions. Our findings suggest that FRBs serve as tracers of the Hubble constant in the late-time Universe. Notably, our results exhibit smaller error bars compared to previous studies, and the derived Hubble constant with 1<span><math><mi>σ</mi></math></span> error bars no longer overlap with those obtained from early-Universe measurements. These results underscore the continuing tension between early- and late-time measurements of the Hubble constant.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101926"},"PeriodicalIF":5.0,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143859030","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":"Naturalness in soft leptogenesis and gravitino mass bound due to primordial black holes","authors":"Suhail Khan,&nbsp;Rathin Adhikari","doi":"10.1016/j.dark.2025.101918","DOIUrl":"10.1016/j.dark.2025.101918","url":null,"abstract":"<div><div>If sneutrinos are produced through primordial black hole (PBH) evaporation, then some interesting features of soft leptogenesis in the Minimal Supersymmetric Standard Model with heavy right-handed neutrinos, are found. The required baryonic asymmetry could be possible from the decays of sneutrinos, for the soft SUSY breaking trilinear <span><math><mi>A</mi></math></span> and bilinear <span><math><mi>B</mi></math></span> parameters around the electroweak scale. The resonance condition in soft leptogenesis is not required. The allowed regions of different relevant parameters are discussed in detail. Using experimental constraints from collider searches on heavy leptons, the lower bound on the right-handed neutrino mass is found to be around 300 GeV with Yukawa coupling lesser than about 0.4. The allowed region of the typical mass scale of some supersymmetric particles and the <span><math><mrow><mo>|</mo><mi>A</mi><mo>|</mo></mrow></math></span> parameter is also shown from the experimental constraint on the branching ratio for <span><math><mrow><mi>μ</mi><mo>→</mo><mi>e</mi><mi>γ</mi></mrow></math></span> in MEG II search. Depending on PBH mass, bounds on the mass of gravitinos, produced from PBH evaporation, is discussed and gravitino mass around the electroweak scale is found to be possible only for unstable gravitino.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101918"},"PeriodicalIF":5.0,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143843557","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":"Spherically symmetric solution in f(T) gravity","authors":"G.G.L. Nashed ,&nbsp;A. Eid","doi":"10.1016/j.dark.2025.101909","DOIUrl":"10.1016/j.dark.2025.101909","url":null,"abstract":"<div><div>In this study, we derive an exact spherically symmetric black hole solution within the gravitational theory defined by <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>T</mi><mo>)</mo></mrow><mo>=</mo><mi>T</mi><mo>+</mo><mfrac><mrow><mi>ζ</mi></mrow><mrow><mn>2</mn></mrow></mfrac><msup><mrow><mi>T</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span> where <span><math><mi>ζ</mi></math></span> has the dimension of <span><math><msup><mrow><mi>T</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span> and <span><math><mi>T</mi></math></span> represents the scalar torsion tensor. A key feature of the tetrad ansatz used here is that it eliminates all off-diagonal components of the field equations, unlike the most of previous approaches. The solution depends on the parameter <span><math><mi>ζ</mi></math></span> and does not reduce to the Schwarzschild spacetime as <span><math><mrow><mi>ζ</mi><mo>→</mo><mn>0</mn></mrow></math></span>. Furthermore, since <span><math><mi>ζ</mi></math></span> cannot be zero, this solution is inherently novel within the framework of o<span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>T</mi><mo>)</mo></mrow></mrow></math></span> theory. We demonstrate that the curvature invariants of this solution exhibit milder singularities compared to those of the Schwarzschild solution. Additionally, we analyze its thermodynamic properties, showing that all derived quantities align well with established results in the literature.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101909"},"PeriodicalIF":5.0,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143839280","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":"Observational constraints on the maximum masses of white dwarfs, neutron stars, and exotic stars in non-minimal derivative coupling gravity","authors":"M.D. Danarianto ,&nbsp;I. Prasetyo ,&nbsp;A. Suroso ,&nbsp;B.E. Gunara ,&nbsp;A. Sulaksono","doi":"10.1016/j.dark.2025.101919","DOIUrl":"10.1016/j.dark.2025.101919","url":null,"abstract":"<div><div>The advancement of astronomical observations opens the possibility of testing our current understanding of gravitational theory in the strong-field regime and probing any deviation from general relativity. We explore to what extent compact stars predicted by non-minimal derivative coupling (NMDC) gravity theory agree with observed data. We investigate white dwarfs (WDs), neutron stars (NSs), and quark stars (QSs) mass and radius in various values of constant scalar <span><math><mrow><mo>|</mo><msub><mrow><mi>Q</mi></mrow><mrow><mi>∞</mi></mrow></msub><mo>|</mo></mrow></math></span> at coupling strength of <span><math><mrow><mi>η</mi><mo>=</mo><mo>±</mo><mn>1</mn></mrow></math></span>. This study focuses on the astrophysical impacts of altering maximum masses by values of <span><math><mrow><mo>|</mo><msub><mrow><mi>Q</mi></mrow><mrow><mi>∞</mi></mrow></msub><mo>|</mo></mrow></math></span> and <span><math><mi>η</mi></math></span>. From an observational point of view, we found that WD stars are consistent with ultra-cold WD mass–radius at <span><math><mrow><mrow><mo>|</mo><msub><mrow><mi>Q</mi></mrow><mrow><mi>∞</mi></mrow></msub><mo>|</mo></mrow><mo>≲</mo><mn>0</mn><mo>.</mo><mn>03</mn></mrow></math></span> in geometrized unit. We also found that QS has a similar impact of mass–radius to NS, where the modification is more significant at higher (central) density. For NS and QS EoSs, the value <span><math><mrow><mo>|</mo><msub><mrow><mi>Q</mi></mrow><mrow><mi>∞</mi></mrow></msub><mo>|</mo></mrow></math></span> strongly alters the critical mass and might eliminate the <span><math><mrow><mi>M</mi><mo>−</mo><msub><mrow><mi>ρ</mi></mrow><mrow><mi>c</mi></mrow></msub></mrow></math></span> turning point in the negative <span><math><mi>η</mi></math></span> case. In that case, the sufficiently large <span><math><mrow><mo>|</mo><msub><mrow><mi>Q</mi></mrow><mrow><mi>∞</mi></mrow></msub><mo>|</mo></mrow></math></span> could predict <span><math><mrow><mi>M</mi><mo>&gt;</mo><mn>2</mn><mo>.</mo><mn>6</mn><msub><mrow><mi>M</mi></mrow><mrow><mo>⊙</mo></mrow></msub></mrow></math></span> NS and QS, i.e., larger than GW190814 secondary counterpart. We suggest that the lower mass gap in the gravitational wave and x-ray binary mass population data might restrict the theory’s <span><math><mrow><mo>|</mo><msub><mrow><mi>Q</mi></mrow><mrow><mi>∞</mi></mrow></msub><mo>|</mo></mrow></math></span>.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101919"},"PeriodicalIF":5.0,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143847795","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":"Accretion disk luminosity around rotating naked singularities","authors":"Yergali Kurmanov ,&nbsp;Kuantay Boshkayev ,&nbsp;Talgar Konysbayev ,&nbsp;Marco Muccino ,&nbsp;Orlando Luongo ,&nbsp;Ainur Urazalina ,&nbsp;Anar Dalelkhankyzy ,&nbsp;Farida Belissarova ,&nbsp;Madina Alimkulova","doi":"10.1016/j.dark.2025.101917","DOIUrl":"10.1016/j.dark.2025.101917","url":null,"abstract":"<div><div>We explore circular geodesics of neutral test particles in the gravitational field of a rotating deformed mass. The geometry around this source is described by the Quevedo–Mashhoon solution, which corresponds to a naked singularity. To this end, we compute the orbital parameters of test particles in the equatorial plane, such as the angular velocity <span><math><mi>Ω</mi></math></span>, energy <span><math><mi>E</mi></math></span> and angular momentum <span><math><mi>L</mi></math></span>, per unit mass. We also numerically estimate the radius of the innermost stable circular orbit <span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>I</mi><mi>S</mi><mi>C</mi><mi>O</mi></mrow></msub></math></span>. In addition, we consider a simple model for the disk’s radiative flux, differential luminosity, and spectral luminosity, employing the well-known Novikov–Page–Thorne model. We mainly focus on the flux of the accretion disk around several rotating naked singularities possessing the same mass and quadrupole moment but different rotation and deformation parameters. We analyze the possibility of distinguishing Kerr black holes from rotating naked singularities. The astrophysical implications of the results obtained are discussed.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101917"},"PeriodicalIF":5.0,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143843463","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":"XTE J1814-338 as a dark matter admixed neutron star","authors":"Luiz L. Lopes ,&nbsp;Adamu Issifu","doi":"10.1016/j.dark.2025.101922","DOIUrl":"10.1016/j.dark.2025.101922","url":null,"abstract":"<div><div>The existence of the ultracompact object XTE J1814-338, with an inferred mass and radius of <span><math><mi>M</mi></math></span> = 1.21 <span><math><mrow><mo>±</mo><mn>0</mn><mo>.</mo><mn>05</mn><msub><mrow><mi>M</mi></mrow><mrow><mo>⊙</mo></mrow></msub></mrow></math></span> and R = 7.0 ± 0.4 km, presents a great challenge for the theory of neutron stars. Within this context, we revisit the theory of dark-matter-admixed neutron stars and infer the physical properties of this compact object, such as the Fermi momentum of dark matter necessary to compress the star at such low radius, its equation of state, speed of sound, and some macroscopic properties, such as the moment of inertia and the dimensionless tidal parameter. We also compare the physical properties of the XTE J1814-338 with other pulsars, such as the canonical 1.4 M<span><math><msub><mrow></mrow><mrow><mo>⊙</mo></mrow></msub></math></span>, the PSR J0740 + 6620, and the HESS J1731-347.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"48 ","pages":"Article 101922"},"PeriodicalIF":5.0,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143839277","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}