Nuclear Physics B最新文献

{"title":"Wormhole thermodynamics in matter-geometry coupled theory: Implications of pseudo-isothermal profile and complexity factor","authors":"Tayyab Naseer ,&nbsp;M. Sharif ,&nbsp;Mona Faiza ,&nbsp;Faisal Javed ,&nbsp;Baiju Dayanandan ,&nbsp;Khalifa Al Shaqsi","doi":"10.1016/j.nuclphysb.2025.116970","DOIUrl":"10.1016/j.nuclphysb.2025.116970","url":null,"abstract":"<div><div>The objective of this article is to explore the existence of traversable wormholes possessing the pseudo-isothermal profile in modified <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><mi>T</mi><mo>)</mo></math></span> gravity. We utilize the Morris-Thorne spacetime to define the wormhole structure and develop anisotropic gravitational equations for a linear modified gravity model. Our analysis involves deriving the shape functions by taking into account both constant and variable redshift functions. These shape functions adhere to the required conditions and create a connection between two asymptotically flat regions of spacetime. For each of the two cases, we analyze energy conditions whose satisfaction ensures the existence of wormholes without the necessity for exotic matter. Furthermore, we evaluate the active gravitational mass, complexity factor and volume integral quantifier for the proposed solutions. It is revealed that all these quantities gain positive value at the wormhole's throat. Afterwards, a detailed stability analysis of the developed models is performed through certain criteria. We also analyze the thermodynamic behavior, focusing on the variation of entropy and its implications for the wormhole geometry. Our findings suggest that the pseudo-isothermal wormhole geometry exists in the context of the considered matter-geometry coupled modified theory.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1017 ","pages":"Article 116970"},"PeriodicalIF":2.5,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144170416","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":"Physical ageing from generalised time-translation-invariance","authors":"Malte Henkel","doi":"10.1016/j.nuclphysb.2025.116968","DOIUrl":"10.1016/j.nuclphysb.2025.116968","url":null,"abstract":"<div><div>A generalised form of time-translation-invariance permits to re-derive the known generic phenomenology of ageing, which arises in classical many-body systems after a quench from an initially disordered system to a temperature <span><math><mi>T</mi><mo>≤</mo><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>, at or below the critical temperature <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>. Generalised time-translation-invariance is obtained, out of equilibrium, from a change of representation of the Lie algebra generators of the dynamical symmetries of scale-invariance and time-translation-invariance. Observable consequences include the algebraic form of the scaling functions for large arguments of the two-time auto-correlators and auto-responses, the equality of the auto-correlation and the auto-response exponents <span><math><msub><mrow><mi>λ</mi></mrow><mrow><mi>C</mi></mrow></msub><mo>=</mo><msub><mrow><mi>λ</mi></mrow><mrow><mi>R</mi></mrow></msub></math></span>, the cross-over scaling form for an initially magnetised critical system and the explanation of a novel finite-size scaling if the auto-correlator or auto-response converge for large arguments <span><math><mi>y</mi><mo>=</mo><mi>t</mi><mo>/</mo><mi>s</mi><mo>≫</mo><mn>1</mn></math></span> to a plateau. For global two-time correlators, the time-dependence involving the initial critical slip exponent Θ is confirmed and is generalised to all temperatures below criticality and to the global two-time response function, and their finite-size scaling is derived as well. This also includes the time-dependence of the squared global order-parameter. The celebrate Janssen-Schaub-Schmittmann scaling relation with the auto-correlation exponent is thereby extended to all temperatures below the critical temperature. A simple criterion on the relevance of non-linear terms in the stochastic equation of motion is derived, taking the dimensionality of couplings into account. Its applicability in a wide class of models is confirmed, for temperatures <span><math><mi>T</mi><mo>≤</mo><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>. Relevance to experiments is also discussed.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1017 ","pages":"Article 116968"},"PeriodicalIF":2.5,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144147620","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":"Coupling constant metamorphosis, Fermat principle and light propagation in Kerr metric","authors":"Joanna Piwnik,&nbsp;Cezary Gonera,&nbsp;Joanna Gonera,&nbsp;Piotr Kosiński","doi":"10.1016/j.nuclphysb.2025.116967","DOIUrl":"10.1016/j.nuclphysb.2025.116967","url":null,"abstract":"<div><div>The geodesics of Kerr's metric are described by the four-dimensional Hamiltonian dynamics integrable in the Arnold-Liouville sense. It can be reduced to two-dimensional one by the use of Fermat's principle. The resulting Hamiltonian is, however, rather complicated. We show how one can apply the coupling constant metamorphosis to simplify the Hamiltonian to the one quadratic in momenta and depending on the initial “energy” as parameter. It describes a simple dynamics of two non-linear oscillators and can be integrated directly or evaluated in the framework of perturbation theory by adopting the elegant Lindstedt–Poincaré algorithm. The idea of coupling constant metamorphosis is also applied to the Myers–Perry metric — a five dimensional generalization of Kerr's metric. The case of single rotation parameter is considered in some detail.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1017 ","pages":"Article 116967"},"PeriodicalIF":2.5,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144147619","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":"Einstein–Gauss–Bonnet–Myrzakulov gravity from R + F(T,G): Numerical insights and torsion–Gauss–Bonnet dynamics in Weitzenböck spacetime","authors":"Davood Momeni ,&nbsp;Ratbay Myrzakulov","doi":"10.1016/j.nuclphysb.2025.116966","DOIUrl":"10.1016/j.nuclphysb.2025.116966","url":null,"abstract":"<div><div>The study of modified gravity models has garnered significant attention because of their potential to provide alternative explanations for cosmological phenomena, such as the accelerated expansion of the universe and the nature of dark energy. One such model, the Einstein–Gauss–Bonnet–Myrzakulov <span><math><mi>R</mi><mo>+</mo><mi>F</mi><mo>(</mo><mi>T</mi><mo>,</mo><mi>G</mi><mo>)</mo></math></span> gravity (EGBMG), which incorporates the curvature <em>R</em>, torsion <em>T</em>, and the Gauss-Bonnet term <em>G</em>, offers a promising framework to explore the dynamics of the universe and its evolution. This paper delves into the theoretical and observational implications of the EGBMG model, focusing on its ability to address long-standing challenges in cosmology, including the evolution of dark energy and the transition from early-time inflationary behavior to late-time acceleration. We review recent advancements in the model, including its compatibility with observational data and its ability to provide new insights into cosmic acceleration. Through a combination of theoretical models, dynamical systems analysis, and cosmological diagnostics, we demonstrate the robustness of the EGBMG framework in explaining the large-scale structure of the universe and its accelerated expansion. This paper serves as a step toward further exploring the potential of this model to understand the fundamental forces driving the cosmos and its consistency with modern observational constraints in Weitzenböck spacetime.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1017 ","pages":"Article 116966"},"PeriodicalIF":2.5,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124611","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":"Periodic Motzkin chain: Ground states and symmetries","authors":"Andrei G. Pronko","doi":"10.1016/j.nuclphysb.2025.116963","DOIUrl":"10.1016/j.nuclphysb.2025.116963","url":null,"abstract":"<div><div>Motzkin chain is a model of nearest-neighbor interacting quantum <span><math><mi>s</mi><mo>=</mo><mn>1</mn></math></span> spins with open boundary conditions. It is known that it has a unique ground state which can be viewed as a sum of Motzkin paths. We consider the case of periodic boundary conditions and provide several conjectures about structure of the ground state space and symmetries of the Hamiltonian. We conjecture that the ground state is degenerate and independent states are distinguished by eigenvalues of the third component of total spin operator. Each of these states can be described as a sum of paths, similar to the Motzkin paths. Moreover, there exist two operators commuting with the Hamiltonian, which play the roles of lowering and raising operators when acting at these states. We conjecture also that these operators generate a <em>C</em>-type Lie algebra, with rank equal to the number of sites. The symmetry algebra of the Hamiltonian is actually wider, and extended, besides the cyclic shift operator, by a central element contained in the third component of total spin operator.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1017 ","pages":"Article 116963"},"PeriodicalIF":2.5,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124612","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":"Gravastar admitting conformal motion in Rastall gravity","authors":"M. Sharif ,&nbsp;Tayyab Naseer ,&nbsp;Areej Tabassum","doi":"10.1016/j.nuclphysb.2025.116960","DOIUrl":"10.1016/j.nuclphysb.2025.116960","url":null,"abstract":"<div><div>This paper investigates a unique stellar object, known as a gravastar that admits the conformal motion within the framework of non-conserved Rastall theory. By incorporating conformal Killing vectors, we analyze how the relationship between matter and geometry influences the gravastar structure and stability under modified field equations. Utilizing these Killing vectors along with an equation of state <span><math><mi>p</mi><mo>=</mo><mi>ω</mi><mi>ρ</mi></math></span>, where <span><math><mn>0</mn><mo>&lt;</mo><mi>ω</mi><mo>&lt;</mo><mn>1</mn></math></span> characterizes the normal matter distribution, we analytically examine various physical properties of the gravastar, including proper length, energy, entropy, equation of state parameter, matching conditions, and stability criteria such as surface redshift and adiabatic index. The graphical analysis for these factors is also presented to further enrich the developed results. We further explore the influence of Rastall parameter on the gravastar's stability and structural configuration. Our findings indicate that Rastall theory, when combined with the conformal symmetry, yields a physically viable gravastar model that may present distinctive features from black holes under specific astrophysical conditions.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1017 ","pages":"Article 116960"},"PeriodicalIF":2.5,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144105342","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":"The cosmological significance of boundary term in non-metricity gravity","authors":"Hamid Shabani ,&nbsp;Avik De ,&nbsp;Tee-How Loo","doi":"10.1016/j.nuclphysb.2025.116965","DOIUrl":"10.1016/j.nuclphysb.2025.116965","url":null,"abstract":"<div><div>Within the context of metric-affine gravity, we examine the significance of the boundary term in symmetric teleparallel gravity by employing the cosmological dynamical system analysis method. We focus on the novel gravity models characterized by the functions <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>,</mo><mi>C</mi><mo>)</mo></math></span>, where <em>f</em> is a smooth function of the non-metricity scalar <em>Q</em> and the associated boundary term <em>C</em>. In a cosmological setting adopting three different classes of symmetric teleparallel affine connections, we investigate a model <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>,</mo><mi>C</mi><mo>)</mo><mo>=</mo><msup><mrow><mi>Q</mi></mrow><mrow><mi>s</mi></mrow></msup><mo>+</mo><mi>e</mi><msup><mrow><mi>C</mi></mrow><mrow><mi>r</mi></mrow></msup></math></span>, and some special cases of this model. We show that the boundary term which is added to the Einsteinian field equations (or equivalently to <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>)</mo><mo>=</mo><mi>Q</mi></math></span> ones) is capable of bringing forward solutions corresponding to the early accelerated expansion. This alludes the physics behind the boundary terms which usually are discarded in the most gravitational theories.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1017 ","pages":"Article 116965"},"PeriodicalIF":2.5,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144115912","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":"Sphaleron and gravitational wave with the Higgs-Dilaton potential in the standard model two-time physics","authors":"Vo Quoc Phong ,&nbsp;Quach Ai Mi ,&nbsp;Nguyen Xuan Vinh","doi":"10.1016/j.nuclphysb.2025.116964","DOIUrl":"10.1016/j.nuclphysb.2025.116964","url":null,"abstract":"<div><div>By introducing a Higgs-Dilaton potential, the 2T model has a trigger for a first order electroweak phase transition, namely for the mass of Dilaton between 300 GeV and 550 GeV. We have also compared the transition strengths in the case with and without daisy loops, the difference being always less than 0.2. The effective Higgs potential has given a sphaleron energy less than 8.4 TeV. The timescale of phase transition <span><math><mo>(</mo><mi>β</mi><mo>/</mo><msup><mrow><mi>H</mi></mrow><mrow><mo>⁎</mo></mrow></msup><mo>)</mo></math></span> is larger than 25 and less than 34 in all cases that are sufficient to trigger the first order electroweak phase transition. Gravitational wave energy density caused by this transition, may be detected by future detectors, could indirectly confirm Dilaton.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1017 ","pages":"Article 116964"},"PeriodicalIF":2.5,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144105341","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":"Can we determine the exact size of the nucleon?: A comprehensive study of different radii","authors":"","doi":"10.1016/j.nuclphysb.2025.116962","DOIUrl":"10.1016/j.nuclphysb.2025.116962","url":null,"abstract":"<div><div>The concept of nucleon radii plays a central role in our understanding of the internal structure of protons and neutrons, providing critical insights into the non-perturbative regime of quantum chromodynamics (QCD). While the charge radius is often interpreted as the “size” of the nucleon, this interpretation is an oversimplification that overlooks the multifaceted nature of nucleon structure. This paper provides a comprehensive overview of the different nucleon radii, including the charge and magnetic radii, the axial radius, and the emerging concepts of mechanical and mass radii. We discuss the definitions as well as the experimental, theoretical and phenomenological determinations of these radii, highlighting their distinct physical origins and implications. By synthesizing recent experimental results and theoretical advancements, we emphasize that each radius reflects a specific aspect of the nucleon's internal structure, such as its electric charge distribution, magnetic properties, weak interactions, or internal mechanical stress. In particular, we address the common but misleading interpretation of the proton radius as a simple measure of its size, underscoring the nuanced and context-dependent nature of nucleon radii. Through this exploration, we aim to clarify the roles of these radii in characterizing nucleon structure and to identify open questions that remain to be addressed. This work contributes to a deeper understanding of the nucleon and its significance in the broader context of particle and nuclear physics.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1017 ","pages":"Article 116962"},"PeriodicalIF":2.5,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099529","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":"Effective quantum gravity black hole with cloud of strings surrounded by quintessence field","authors":"Ahmad Al-Badawi ,&nbsp;Faizuddin Ahmed ,&nbsp;İzzet Sakallı","doi":"10.1016/j.nuclphysb.2025.116961","DOIUrl":"10.1016/j.nuclphysb.2025.116961","url":null,"abstract":"<div><div>In this study, we investigate a static, spherically symmetric black hole (BH) within the framework of Effective Quantum Gravity (EQG) in the presence of a cloud of strings (CS) and a quintessence field (QF). We derive the modified metric function incorporating quantum corrections and analyze its impact on the horizon structure, geodesic motion, shadow formation, scalar perturbations, and thermodynamics. The metric function is influenced by three key parameters: the quantum correction parameter <em>ξ</em>, the CS parameter <em>α</em>, and the parameters (<span><math><mi>c</mi><mo>,</mo><mi>w</mi></math></span>) of the QF. Our results reveal that increasing <em>ξ</em> primarily influences the Cauchy horizon, causing it to expand, while having a negligible effect on the event and cosmological horizons. On the other hand, larger values of <em>α</em> and <em>c</em> lead to an increase in the event horizon radius while reducing the cosmological horizon. The study of null and time-like geodesics indicates that quantum effects modify photon trajectories and the stability of circular orbits. We derive analytical expressions for the radius of the photon sphere and the BH shadow. Our findings indicate that the presence of QF and CS enlarges the shadow radius, whereas the incorporation of effective quantum corrections (<em>ξ</em>) reduces it. Using the Regge-Wheeler equation, we analyze scalar perturbations and greybody factors, demonstrating that <em>ξ</em> suppresses transmission probabilities while enhancing reflection coefficients. This study paves the way for further exploration of EQG-modified rotating BHs, gravitational wave emissions, and astrophysical tests of quantum corrections in future observational studies.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1017 ","pages":"Article 116961"},"PeriodicalIF":2.5,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099528","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}