Nuclear Physics B最新文献

{"title":"Strange quark stars and condensate dark stars in Bumblebee gravity","authors":"Grigoris Panotopoulos ,&nbsp;Ali Övgün","doi":"10.1016/j.nuclphysb.2025.116956","DOIUrl":"10.1016/j.nuclphysb.2025.116956","url":null,"abstract":"<div><div>In this paper, we investigate the properties of relativistic stars made of isotropic matter within the framework of the minimal Standard Model Extension, where a Bumblebee field (BF) coupled to spacetime induces spontaneous Lorentz symmetry breaking. We adopt analytic equations-of-state describing either condensate dark stars or strange quark stars. We solve the structure equations numerically, and we compute the mass-to-radius relationships. The influence of the Bumblebee parameter <strong>l</strong> is examined in detail, and an upper bound is obtained using the massive pulsar (PSR) J0740+6620 and the strangely light High Energy Stereoscopic System (HESS) J1731-347 compact object.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1017 ","pages":"Article 116956"},"PeriodicalIF":2.5,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Bell and Mermin inequalities in Quantum Field Theory from vacuum projectors and Weyl operators","authors":"M.S. Guimaraes ,&nbsp;I. Roditi ,&nbsp;S.P. Sorella ,&nbsp;A.F. Vieira","doi":"10.1016/j.nuclphysb.2025.116942","DOIUrl":"10.1016/j.nuclphysb.2025.116942","url":null,"abstract":"<div><div>The use of the vacuum projector <span><math><mo>|</mo><mn>0</mn><mo>〉</mo><mo>〈</mo><mn>0</mn><mo>|</mo></math></span> and of the unitary Weyl operators enables us to construct a set of Hermitian dichotomic operators in relativistic scalar Quantum Field Theory in Minkowski spacetime. Employing test functions supported in diamond regions, both Bell and Mermin inequalities are studied by means of a numerical setup. In addition to reporting expressive violations of both inequalities, the cluster property is also checked.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1017 ","pages":"Article 116942"},"PeriodicalIF":2.5,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143943430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Constructing noncommutative black holes","authors":"Tajron Jurić,&nbsp;A. Naveena Kumara,&nbsp;Filip Požar","doi":"10.1016/j.nuclphysb.2025.116950","DOIUrl":"10.1016/j.nuclphysb.2025.116950","url":null,"abstract":"<div><div>We present a self-contained and consistent formulation of noncommutative (NC) gauge theory of gravity, focusing on spherically symmetric black hole geometries. Our construction starts from the gauge-theoretic viewpoint of Poincaré (or de Sitter) gravity and introduces noncommutativity through the Moyal star product and the Seiberg-Witten map, retaining NC gauge invariance at each order in the deformation parameter Θ. Working systematically to second order in Θ, we obtain explicit NC corrections to the spin connection, the vierbein, and various geometric objects such as the metric and curvature scalars. Using these results, we compute NC modifications of four-dimensional Schwarzschild and Reissner-Nordström solutions, including scenarios with a cosmological constant, as well as three-dimensional BTZ-type black holes (both uncharged and charged). For each black hole solution, we explore various possible Moyal twists, each of which generally breaks some symmetries and modifies the horizon structure, surface gravity, and curvature invariants. In particular, we show that while the radial location of horizons in Schwarzschild-like solutions remains unchanged for some twists, other twists introduce important but finite deformations in curvature scalars and can decouple the Killing horizon from the causal horizon. Similar patterns arise in the charged and lower-dimensional cases. Beyond constructing explicit examples, our approach provides a blueprint for systematically incorporating short-distance quantum corrections through noncommutativity in gravitational settings. The methods and expansions we present can be extended to more general geometries including rotating black holes and additional matter fields, offering a broad framework for future studies of NC effects in classical solutions of general relativity.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1017 ","pages":"Article 116950"},"PeriodicalIF":2.5,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Plasma lensing and particle dynamics in the vicinity of a Dyonic black hole solution in the context a perfect fluid","authors":"Allah Ditta ,&nbsp;Sikander Mehmood ,&nbsp;Wajiha Tanveer ,&nbsp;Waleed Ahmad ,&nbsp;Awad A. Ibraheem ,&nbsp;Rana Muhammad Zulqarnain ,&nbsp;Farruh Atamurotov","doi":"10.1016/j.nuclphysb.2025.116949","DOIUrl":"10.1016/j.nuclphysb.2025.116949","url":null,"abstract":"<div><div>This article investigates the particle motion properties, and plasma lensing in weak gravitational field around a Dyonic black hole solution in a perfect fluid. We analyze the motion of massive and massless particles by studying the effective potential, energy, and angular momentum as a function of electric and magnetic charge, the fluid parameters, <strong>a</strong>, and the surrounding field parameter <em>ω</em>. We have examined the features using Dyonic black holes, including horizon structure, photon orbit, and ISCO radius, to better understand the effect of black hole parameters on their behavior. Our findings indicate that by increasing the electric charge <span><math><msub><mrow><mi>q</mi></mrow><mrow><mi>E</mi></mrow></msub></math></span>, magnetic charge, <span><math><msub><mrow><mi>q</mi></mrow><mrow><mi>M</mi></mrow></msub></math></span>, and surrounding field parameter <em>ω</em> brings the orbit closer to the central compact object. In contrast, the fluid parameter <strong>a</strong> has an opposing effect, shifting the ISCO outward. Wa have also determined the deflection angle of light rays surrounding the black hole in a weak plasma environment using the uniform and <em>SIS</em> plasma fields, and found that black holes parameters have clear effect on deflection angle.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1017 ","pages":"Article 116949"},"PeriodicalIF":2.5,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144068642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Studying the enigma of particle dynamics using a new type of regular charged black hole","authors":"Allah Ditta ,&nbsp;Ibrar Hussain ,&nbsp;Farzan Mushtaq ,&nbsp;G. Mustafa ,&nbsp;Farruh Atamurotov","doi":"10.1016/j.nuclphysb.2025.116943","DOIUrl":"10.1016/j.nuclphysb.2025.116943","url":null,"abstract":"<div><div>This study examines the regular charged black hole solution by investigating particle dynamics and various related properties, such as the radius of the horizon, the effective force, the energy, the angular momentum, the ISCO radius, the photon radius, the red-blue shift, and the weak plasma lensing in uniform plasma fields, <em>SIS</em>, and <span><math><mi>N</mi><mi>S</mi><mi>I</mi><mi>S</mi></math></span>. Furthermore, we examine the image magnification for the black hole solution. A salient characteristic of this black hole solution is the incorporation of the magnetic charge parameter <em>q</em>, which differentiates it from the Schwarzschild black hole solution. By taking <span><math><mi>q</mi><mo>=</mo><mn>0</mn></math></span>, we compare our results with the Schwarzschild black hole scenario and identify substantial variations. Our research elucidates the impact of the magnetic charge parameter <em>q</em> on multiple physical parameters of the black hole and offers a comprehensive comparison with the Schwarzschild black hole solution.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1017 ","pages":"Article 116943"},"PeriodicalIF":2.5,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144068643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"BMS symmetries of gravitational scattering","authors":"Xavier Kervyn","doi":"10.1016/j.nuclphysb.2025.116948","DOIUrl":"10.1016/j.nuclphysb.2025.116948","url":null,"abstract":"<div><div>After motivating the relevance of the Bondi-Metzner-Sachs (BMS) group over the last decades, we review how concepts such as Penrose diagrams and the covariant phase space formalism can be used to understand the asymptotic structure of asymptotically flat spacetimes (AFS). We then explicitly construct the asymptotic symmetry group of AFS in <span><math><mn>3</mn><mo>+</mo><mn>1</mn></math></span> dimensions, the BMS group. Next, we apply this knowledge to the usual far-field scattering problem in general relativity, which leads to the unravelling of the intrinsic features of gravity in the infrared. In particular, we work out the connections between asymptotic symmetries, soft theorems in quantum field theories and gravitational memory effects. We restrict to the study of this <em>infrared triangle</em> through the lens of supertranslations here, but the analogous features that can be found in the case of superrotations or for other gauge theories are also motivated at the end of our discussion. We conclude with an overview of the implications of the infrared triangle of gravity for the formulation of an approach to quantum gravity through holography, as well as a brief discussion of its potential in tackling the black hole information paradox.</div><div>This review article arose from an essay submitted for the partial fulfilment of the requirements for the degree of <em>Master of Advanced Study in Applied Mathematics</em> (Part III of the Mathematical Tripos) at the University of Cambridge, set by Dr. Prahar Mitra and submitted by the author in May 2023. It is aimed at advanced undergraduate students or early postgraduate students willing to learn about the role of asymptotic symmetries in the context of flat space holography, with only basic knowledge of quantum field theory and general relativity assumed.</div></div><div><h3>Note</h3><div>Another comprehensive review on this topic by Laura Donnay <span><span>[1]</span></span> appeared between the submission of this essay and its publication. The present review provides complementary background material and includes explicit derivations, which may be useful to young researchers.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1017 ","pages":"Article 116948"},"PeriodicalIF":2.5,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143935522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Scaling law for membrane lifetime","authors":"Osamu Fukushima ,&nbsp;Tomohiro Shigemura ,&nbsp;Kentaroh Yoshida","doi":"10.1016/j.nuclphysb.2025.116946","DOIUrl":"10.1016/j.nuclphysb.2025.116946","url":null,"abstract":"<div><div>Membrane configurations in the Banks-Fischler-Shenker-Susskind matrix model are unstable due to the existence of flat directions in the potential and the decay process can be seen as a realization of chaotic scattering. In this note, we compute the lifetime of a membrane in a reduced model. The resulting lifetime exhibits scaling laws with respect to energy, coupling constant and a cut-off scale. We numerically evaluate the scaling exponents, which cannot be fixed by the dimensional analysis. Finally, some applications of the results are discussed.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1017 ","pages":"Article 116946"},"PeriodicalIF":2.5,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143943429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Misconceptions in neutrino oscillations in presence of non-unitary mixing","authors":"Mattias Blennow ,&nbsp;Pilar Coloma ,&nbsp;Enrique Fernández-Martínez ,&nbsp;Josu Hernández-García ,&nbsp;Jacobo López-Pavón ,&nbsp;Xabier Marcano ,&nbsp;Daniel Naredo-Tuero ,&nbsp;Salvador Urrea","doi":"10.1016/j.nuclphysb.2025.116944","DOIUrl":"10.1016/j.nuclphysb.2025.116944","url":null,"abstract":"<div><div>Deviations from unitarity of the CKM matrix in the quark sector are considered excellent windows to probe physics beyond the Standard Model. In its leptonic counterpart, the PMNS matrix, these searches are particularly motivated, as the new physics needed to generate neutrino masses often leads to non-unitary mixing among the standard neutrinos. It is then interesting to consider how neutrino oscillations are affected in such scenario. This simple question is, however, subject to several subtleties: What is the correct way to define oscillation probabilities for a non-unitary mixing matrix? Do these probabilities add up to one? Does a non-unitary mixing matrix lead to observable flavor transitions at zero distance? What is the interplay between unitarity constraints obtained from neutrino oscillations and from electroweak precision data? This work aims to shed light on these issues and to clarify the corresponding misconceptions commonly found in the literature. We also compile updated bounds from neutrino oscillation searches to compare with those from flavour and electroweak precision observables.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1017 ","pages":"Article 116944"},"PeriodicalIF":2.5,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143943431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 singularities in brane gravity","authors":"R. Jalalzadeh ,&nbsp;S. Jalalzadeh ,&nbsp;Y. Heydarzade","doi":"10.1016/j.nuclphysb.2025.116945","DOIUrl":"10.1016/j.nuclphysb.2025.116945","url":null,"abstract":"<div><div>We present a comprehensive study of cosmological singularities within the framework of Covariant Extrinsic Gravity (CEG), addressing both the initial Big Bang singularity and potential finite-time future singularities. Through detailed analysis of the emergent universe scenario, we systematically examine homogeneous and inhomogeneous perturbations (encompassing scalar, vector, and tensor modes) in a 4D FLRW brane geometry. Our work establishes rigorous existence criteria and stability conditions for a nonsingular Einstein static initial state, demonstrating that such a configuration remains stable for well-defined parameter ranges in CEG – thereby providing a compelling resolution to the long-standing initial singularity problem. Extending our analysis to late-time cosmology, we perform a complete classification of future singularity types following Barrow et al.'s formalism, deriving precise conditions that determine whether the universe in CEG evolves toward or avoids these singular states.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1017 ","pages":"Article 116945"},"PeriodicalIF":2.5,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143935523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Reminiscences about Steven Weinberg (this time it's personal)","authors":"C.P. Burgess","doi":"10.1016/j.nuclphysb.2025.116937","DOIUrl":"10.1016/j.nuclphysb.2025.116937","url":null,"abstract":"<div><div>Steven Weinberg's productive scientific life teaches us many things, one of the most important of which is the power of his example. This essay contains personal reminiscences and a speculation about gravitational wave propagation based on one of his very last papers – as seems fitting, given his penchant for putting interesting physics into the essays he wrote for other luminaries over the years. (See <span><span>[1]</span></span> for a less personal summary of his main scientific accomplishments.)</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1017 ","pages":"Article 116937"},"PeriodicalIF":2.5,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}