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Thermal aspects of central supermassive black holes in a fractal framework
IF 4.3 2区 物理与天体物理
Physics Letters B Pub Date : 2025-03-27 DOI: 10.1016/j.physletb.2025.139431
Everton M.C. Abreu , M.J. Neves
{"title":"Thermal aspects of central supermassive black holes in a fractal framework","authors":"Everton M.C. Abreu ,&nbsp;M.J. Neves","doi":"10.1016/j.physletb.2025.139431","DOIUrl":"10.1016/j.physletb.2025.139431","url":null,"abstract":"<div><div>In this paper we will compute the entropy of a supermassive black hole (SMBH) that dwells at the center of the galaxies described in an intricate, fractal, structure. We will consider that the dweller SMBH is of the power law kind introduced by Barrow recently. The entropy will be calculated from an expression that used the velocity dispersion and a specific parameter given by this power law entropy. This parameter, when different from zero and equal to a non-integer number, describes a more intricate structure of spacetime, namely, a fractal framework. We described the results of the entropic investigations of ten galaxies that are considered to live in a fractal structure as well. We have also computed other thermodynamical quantities like the temperature, the heat capacity, the Helmholtz free energy and the partition function. We have shown that in the case of a more intricate geometry, the Helmholtz free energy is negative meaning that the entropy is bigger than the internal energy. The results obtained here are within the expected results given by the Barrow BH entropic model.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139431"},"PeriodicalIF":4.3,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739036","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}
引用次数: 0
Erratum to “Evolution of genuine states to molecular ones: The Tcc(3875) case” [Phys. Lett. B 846 (2023) 138200]
IF 4.3 2区 物理与天体物理
Physics Letters B Pub Date : 2025-03-26 DOI: 10.1016/j.physletb.2025.139424
L.R. Dai, J. Song, E. Oset
{"title":"Erratum to “Evolution of genuine states to molecular ones: The Tcc(3875) case” [Phys. Lett. B 846 (2023) 138200]","authors":"L.R. Dai,&nbsp;J. Song,&nbsp;E. Oset","doi":"10.1016/j.physletb.2025.139424","DOIUrl":"10.1016/j.physletb.2025.139424","url":null,"abstract":"","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139424"},"PeriodicalIF":4.3,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716346","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}
引用次数: 0
In-medium ΛN interactions with leading order covariant chiral hyperon/nucleon-nucleon forces
IF 4.3 2区 物理与天体物理
Physics Letters B Pub Date : 2025-03-26 DOI: 10.1016/j.physletb.2025.139416
Ru-You Zheng , Zhi-Wei Liu , Li-Sheng Geng , Jin-Niu Hu , Sibo Wang
{"title":"In-medium ΛN interactions with leading order covariant chiral hyperon/nucleon-nucleon forces","authors":"Ru-You Zheng ,&nbsp;Zhi-Wei Liu ,&nbsp;Li-Sheng Geng ,&nbsp;Jin-Niu Hu ,&nbsp;Sibo Wang","doi":"10.1016/j.physletb.2025.139416","DOIUrl":"10.1016/j.physletb.2025.139416","url":null,"abstract":"<div><div>In-medium Λ<em>N</em> interactions are crucial in hypernuclei and neutron star physics. In this work, we study the in-medium Λ<em>N</em> interaction within the relativistic Brueckner-Hartree-Fock (RBHF) framework, employing the leading-order covariant chiral hyperon/nucleon-nucleon forces for the first time. We demonstrate that a consistent description of both the experimental cross-section data and the ‘empirical value’ of the Λ single-particle potential can be achieved. This contrasts with the majority of studies in the non-relativistic framework, where higher-order two-body chiral forces are typically required. This study offers a new perspective on the in-medium Λ<em>N</em> interactions, urgently needed in relativistic <em>ab initio</em> hypernuclear physics studies.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139416"},"PeriodicalIF":4.3,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738851","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}
引用次数: 0
Position space equations for generic Feynman graphs
IF 4.3 2区 物理与天体物理
Physics Letters B Pub Date : 2025-03-26 DOI: 10.1016/j.physletb.2025.139417
V. Mishnyakov , A. Morozov , M. Reva
{"title":"Position space equations for generic Feynman graphs","authors":"V. Mishnyakov ,&nbsp;A. Morozov ,&nbsp;M. Reva","doi":"10.1016/j.physletb.2025.139417","DOIUrl":"10.1016/j.physletb.2025.139417","url":null,"abstract":"<div><div>We propose an extension of the position space approach to Feynman integrals from the banana family to generic Feynman diagrams. Our approach is based on omitting integration in position space and then writing differential equations for the products of propagators defined for any graph. We employ the so-called ‘bananization’, where we start with simple Feynman graphs and further substitute each edge with a multiple one. We explain how the previously developed theory of banana diagrams can be used to describe what happens to the differential equations on Feynman diagrams after this transformation. Our approach works for generic (large enough) dimension and masses. We expect that after Fourier transform our equations should be related to the Picard-Fuchs equations. Therefore, we describe the challenges of the Fourier transform that arise in our approach.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139417"},"PeriodicalIF":4.3,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143791784","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}
引用次数: 0
Boosted dark matter from semi-annihilations in the galactic center
IF 4.3 2区 物理与天体物理
Physics Letters B Pub Date : 2025-03-26 DOI: 10.1016/j.physletb.2025.139425
Boris Betancourt Kamenetskaia , Motoko Fujiwara , Alejandro Ibarra , Takashi Toma
{"title":"Boosted dark matter from semi-annihilations in the galactic center","authors":"Boris Betancourt Kamenetskaia ,&nbsp;Motoko Fujiwara ,&nbsp;Alejandro Ibarra ,&nbsp;Takashi Toma","doi":"10.1016/j.physletb.2025.139425","DOIUrl":"10.1016/j.physletb.2025.139425","url":null,"abstract":"<div><div>In some scenarios, the dark matter relic abundance is set by the semi-annihilation of two dark matter particles into one dark matter particle and one Standard Model particle. These semi-annihilations might still be occurring today in the galactic center at a significant rate, generating a flux of boosted dark matter particles. We investigate the possible signals of this flux component in direct detection and neutrino experiments for sub-GeV dark matter masses. We show that for typical values of the semi-annihilation cross-section, the sensitivity of current experiments to the spin-independent dark matter-proton scattering cross-section can be several orders of magnitude larger than current constraints from cosmic-ray boosted dark matter. We also argue that the upcoming DARWIN and DUNE experiments may probe scattering cross-sections as low as <span><math><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>37</mn></mrow></msup><mspace></mspace><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span> for masses between 30 MeV and 1 GeV.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139425"},"PeriodicalIF":4.3,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739041","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}
引用次数: 0
Unitary evolution and cosmic acceleration in Loop Quantum Cosmology
IF 4.3 2区 物理与天体物理
Physics Letters B Pub Date : 2025-03-26 DOI: 10.1016/j.physletb.2025.139419
Omar Gallegos , Tonatiuh Matos , Hugo A. Morales-Técotl
{"title":"Unitary evolution and cosmic acceleration in Loop Quantum Cosmology","authors":"Omar Gallegos ,&nbsp;Tonatiuh Matos ,&nbsp;Hugo A. Morales-Técotl","doi":"10.1016/j.physletb.2025.139419","DOIUrl":"10.1016/j.physletb.2025.139419","url":null,"abstract":"<div><div>Loop quantum cosmology was shown to interpolate between de Sitter and FLRW Universe phases through a bounce by including Euclidean and Lorentzian terms of the Hamiltonian constraint with weight one -that corresponding to classical General Relativity. Unitary evolution required self-adjoint extensions of the constraint and a Planckian cosmological constant was obtained. Independent work took a positive weight to get a cosmological constant with the observed value, without considering unitarity. In this work we address the unitary evolution of the model for arbitrary weight. For non positive weight parameter unitary holds but for positive values self-adjoint extensions are required. To encompass observations the extensions here provided are mandatory. These are implemented in a propagator. Finally, we discuss our results and perspectives.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139419"},"PeriodicalIF":4.3,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716344","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}
引用次数: 0
Addendum to “Herrera complexity and shadows of spherically symmetric compact objects” [Phys. Lett. B 861 (2025) 139261]
IF 4.3 2区 物理与天体物理
Physics Letters B Pub Date : 2025-03-26 DOI: 10.1016/j.physletb.2025.139428
Subhasis Nalui, Subhra Bhattacharya
{"title":"Addendum to “Herrera complexity and shadows of spherically symmetric compact objects” [Phys. Lett. B 861 (2025) 139261]","authors":"Subhasis Nalui,&nbsp;Subhra Bhattacharya","doi":"10.1016/j.physletb.2025.139428","DOIUrl":"10.1016/j.physletb.2025.139428","url":null,"abstract":"<div><div>Omitted citations have been provided.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139428"},"PeriodicalIF":4.3,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716347","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}
引用次数: 0
Bounce cosmologies in generalized coupling theories
IF 4.3 2区 物理与天体物理
Physics Letters B Pub Date : 2025-03-26 DOI: 10.1016/j.physletb.2025.139426
Antonio Troisi , Sante Carloni
{"title":"Bounce cosmologies in generalized coupling theories","authors":"Antonio Troisi ,&nbsp;Sante Carloni","doi":"10.1016/j.physletb.2025.139426","DOIUrl":"10.1016/j.physletb.2025.139426","url":null,"abstract":"<div><div>We describe an exact solution representing a bouncing cosmology in the Minimal Exponential Measure (MEMe) model. Such a solution, obtained by means of the linearization around small values of the characteristic energy scale <em>q</em> of the theory, has the peculiarity of representing a complete bounce model that can be used to explore quantitative processes in non-singular cosmologies.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139426"},"PeriodicalIF":4.3,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739072","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}
引用次数: 0
Bayesian method for quantifying the non-Gaussian fluctuations in low-intermediate energy heavy ion collisions
IF 4.3 2区 物理与天体物理
Physics Letters B Pub Date : 2025-03-26 DOI: 10.1016/j.physletb.2025.139427
Xinyu Wang , Xiang Chen , Junping Yang , Ying Cui , Zhuxia Li , Kai Zhao , Yingxun Zhang
{"title":"Bayesian method for quantifying the non-Gaussian fluctuations in low-intermediate energy heavy ion collisions","authors":"Xinyu Wang ,&nbsp;Xiang Chen ,&nbsp;Junping Yang ,&nbsp;Ying Cui ,&nbsp;Zhuxia Li ,&nbsp;Kai Zhao ,&nbsp;Yingxun Zhang","doi":"10.1016/j.physletb.2025.139427","DOIUrl":"10.1016/j.physletb.2025.139427","url":null,"abstract":"<div><div>In this work, we present a model-independent method to quantify the non-Gaussian fluctuations in the observable distributions, which are assessed by the difference between the measured observable distributions and reconstructed observable distributions via the Bayesian method. Our results indicate that the strength of non-Gaussian fluctuation increases with the beam energy, and is primarily driven by non-central collision mechanisms. The experimental measurement of the strength of non-Gaussian fluctuation of the observable distributions will provide valuable insights into understanding the nonequilibrium effects in heavy ion collisions and the liquid-gas phase transition in finite nuclei.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139427"},"PeriodicalIF":4.3,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716342","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}
引用次数: 0
Observational constraints on entropic cosmology
IF 4.3 2区 物理与天体物理
Physics Letters B Pub Date : 2025-03-25 DOI: 10.1016/j.physletb.2025.139415
Javier Chagoya , I. Díaz-Saldaña , Mario H. Amante , J.C. López-Domínguez , M. Sabido
{"title":"Observational constraints on entropic cosmology","authors":"Javier Chagoya ,&nbsp;I. Díaz-Saldaña ,&nbsp;Mario H. Amante ,&nbsp;J.C. López-Domínguez ,&nbsp;M. Sabido","doi":"10.1016/j.physletb.2025.139415","DOIUrl":"10.1016/j.physletb.2025.139415","url":null,"abstract":"<div><div>In this work, we derive a generalized modified Friedmann equation based on an entropy-area relation that incorporates established modifications, such as volumetric, linear, and logarithmic terms, in addition to novel entropic modifications that might yield to relevant cosmological implications at different stages of the evolution of the Universe. Some of these modifications are capable of mimicking the effects of dark energy and describing the current state of accelerated expansion of the Universe. We study particular cases of the generalized Friedmann equation and constrain the free parameters using observational datasets, including Hubble parameter measurements, baryon acoustic oscillations, and strong lensing systems. Our findings indicate that the proposed models align well with current observational data, particularly in low-redshift regimes; furthermore, these models are compatible with the value of <span><math><msub><mrow><mi>H</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> obtained by the SH0ES program.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139415"},"PeriodicalIF":4.3,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739037","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}
引用次数: 0
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