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First law of black holes in the gravitational electromagnetic system with magnetic charge
IF 4.3 2区 物理与天体物理
Physics Letters B Pub Date : 2025-03-28 DOI: 10.1016/j.physletb.2025.139432
Jie Jiang , Aofei Sang
{"title":"First law of black holes in the gravitational electromagnetic system with magnetic charge","authors":"Jie Jiang ,&nbsp;Aofei Sang","doi":"10.1016/j.physletb.2025.139432","DOIUrl":"10.1016/j.physletb.2025.139432","url":null,"abstract":"<div><div>The quantum corrections in Einstein-Maxwell theory are typically described by introducing higher-curvature terms and non-minimally coupled electromagnetic fields. Our paper investigates the first law of dyonic black holes in the four-dimensional gravitational electromagnetic system with the Lagrangian <span><math><mi>L</mi><mo>(</mo><msub><mrow><mi>g</mi></mrow><mrow><mi>a</mi><mi>b</mi></mrow></msub><mo>,</mo><msub><mrow><mi>R</mi></mrow><mrow><mi>a</mi><mi>b</mi><mi>c</mi><mi>d</mi></mrow></msub><mo>,</mo><msub><mrow><mi>F</mi></mrow><mrow><mi>a</mi><mi>b</mi></mrow></msub><mo>)</mo></math></span>. In previous studies, the magnetic “potential-charge” term in the first law of dyonic black holes was primarily obtained directly from the analytic solutions of black holes or through Komar integral variations in Einstein gravity, with limited applicability. Our analysis reveals that the failure of the Iyer-Wald method to derive the magnetic “potential-charge” term is mainly due to the assumption that the electromagnetic vector potential is regular at the axial poles. Consequently, without requiring regularity of the electromagnetic vector potential at the future Killing horizon and axial poles, we generally derive the first law of asymptotically flat stationary-axisymmetric black holes, which includes both electric and magnetic “potential-charge” terms. Finally, we apply our findings to the general quadric corrected Einstein-Maxwell theory. Our results indicate that the first law with the magnetic charge of black holes might be valid for the Einstein-Maxwell theory with some quantum corrections in the effective region.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139432"},"PeriodicalIF":4.3,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739033","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
Special Fano geometry from Feynman integrals
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.2025.139420
Rolf Schimmrigk
{"title":"Special Fano geometry from Feynman integrals","authors":"Rolf Schimmrigk","doi":"10.1016/j.physletb.2025.139420","DOIUrl":"10.1016/j.physletb.2025.139420","url":null,"abstract":"<div><div>One of the fundamental open questions in QFT is what kind of functions appear as Feynman integrals. In recent years this question has often been considered in a geometric context by interpreting the polynomials that appear in these integrals as defining algebraic varieties. One focal point of the past decade has in particular been the class of Calabi-Yau varieties that arise in some types of Feynman integrals. A class of manifolds that includes CYs as a special case are varieties of special Fano type. These varieties were originally introduced because the class of CY spaces is not closed under mirror symmetry. Their Hodge structure is of a more general type and the middle cohomology in particular is determined by two integers, the dimension of the manifold and a charge <em>Q</em>. In the present paper this class of manifolds is considered in the context of Feynman integrals.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139420"},"PeriodicalIF":4.3,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143799984","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
Implications of pulsar timing array results for high frequency gravitational waves
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.2025.139429
Junsong Cang , Yu Gao , Yiming Liu , Sichun Sun
{"title":"Implications of pulsar timing array results for high frequency gravitational waves","authors":"Junsong Cang ,&nbsp;Yu Gao ,&nbsp;Yiming Liu ,&nbsp;Sichun Sun","doi":"10.1016/j.physletb.2025.139429","DOIUrl":"10.1016/j.physletb.2025.139429","url":null,"abstract":"<div><div>Several pulsar timing array (PTA) experiments such as NANOGrav and PPTA recently reported evidence of a gravitational wave (GW) background at nano-Hz frequency band. This signal can originate from scalar-induced gravitational waves (SIGW) generated by the enhanced curvature perturbation. Production of SIGW is expected to be accompanied by formation of primordial black holes (PBH), which can emit GW through binary mergers. Here we perform a joint likelihood inference on PTA datasets in combination with existing limits on PBH abundance and GW density, we derive full Bayesian posteriors for PBH distribution and relevant PBH merger signal. Our results show that analysis using PTA data alone implies significant overproduction of PBHs, and accounting for current PBH limits causes visible shifts in SIGW posterior. If PTA signals are indeed of SIGW origin, the required curvature perturbation amplitude produces PBHs in a narrow mass window of <span><math><mo>[</mo><mn>6</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup><mo>,</mo><mn>2</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup><mo>]</mo><mspace></mspace><msub><mrow><mi>m</mi></mrow><mrow><mo>⊙</mo></mrow></msub></math></span>. Mergers of these PBHs can leave a strong GW signature in <span><math><mo>[</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>3</mn></mrow></msup><mo>,</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>5</mn></mrow></msup><mo>]</mo></math></span> Hz frequency range, to be detectable at upcoming interferometers such as LISA, aLIGO, Einstein Telescope, DECIGO and BBO, etc. This offers a multi-frequency opportunity to further scrutinize the source of the observed PTA signal and can potentially improve current PBH constraints by up to 5 orders of magnitudes.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139429"},"PeriodicalIF":4.3,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739038","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
Thermodynamics of Bardeen black holes in restricted phase space
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.2025.139418
Yahya Ladghami , Brahim Asfour , Amine Bouali , Ahmed Errahmani , Taoufik Ouali
{"title":"Thermodynamics of Bardeen black holes in restricted phase space","authors":"Yahya Ladghami ,&nbsp;Brahim Asfour ,&nbsp;Amine Bouali ,&nbsp;Ahmed Errahmani ,&nbsp;Taoufik Ouali","doi":"10.1016/j.physletb.2025.139418","DOIUrl":"10.1016/j.physletb.2025.139418","url":null,"abstract":"<div><div>In this paper, we investigate the thermodynamics of Bardeen black holes within the framework of Restricted Phase Space (RPS) thermodynamics. Building upon the holographic interpretation of black hole thermodynamics, we derive key thermodynamic quantities, including mass, temperature and entropy, to analyze the phase structure and stability of these regular black holes. Our results reveal that phase transitions and stability characteristics of Bardeen black holes bear a striking resemblance to those of Reissner-Nordström anti-de Sitter (RN-AdS) black holes, indicating that the presence of singularities does not significantly alter their thermodynamic behavior. Additionally, we introduce a novel equation of state that underscores the role of magnetic charge, entropy and the central charge in determining the thermal evolution of these black holes. This study contributes to a deeper understanding of black hole thermodynamics in the context of non-singular spacetime.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139418"},"PeriodicalIF":4.3,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739031","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
Lower bound on the time-to-mass ratio of circular trajectories in spherically symmetric curved spacetimes
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.2025.139430
Shahar Hod
{"title":"Lower bound on the time-to-mass ratio of circular trajectories in spherically symmetric curved spacetimes","authors":"Shahar Hod","doi":"10.1016/j.physletb.2025.139430","DOIUrl":"10.1016/j.physletb.2025.139430","url":null,"abstract":"<div><div>It is proved that the Einstein-matter field equations supplemented by the weak (positive) energy condition yield the dimensionless lower bound <span><math><msub><mrow><mi>T</mi></mrow><mrow><mo>∞</mo></mrow></msub><mo>/</mo><mi>M</mi><mo>(</mo><mi>r</mi><mo>)</mo><mo>≥</mo><mn>6</mn><msqrt><mrow><mn>3</mn></mrow></msqrt><mi>π</mi></math></span> on the orbital-time-to-mass ratio of closed circular motions in curved spacetimes, where <span><math><mo>{</mo><mi>r</mi><mo>,</mo><msub><mrow><mi>T</mi></mrow><mrow><mo>∞</mo></mrow></msub><mo>,</mo><mi>M</mi><mo>(</mo><mi>r</mi><mo>)</mo><mo>}</mo></math></span> are respectively the radius of the circular trajectory, the orbital period as measured by asymptotic observers, and the gravitational mass contained within the sphere of radius <em>r</em>. We explicitly prove that the bound is valid for circular motions of test particles in black-hole spacetimes as well as in spatially regular horizonless spacetimes.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139430"},"PeriodicalIF":4.3,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739032","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
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
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