Nuclear Physics B最新文献

{"title":"New constraints on singlet scalar dark matter model with LZ, invisible Higgs decay and gamma-ray line observations","authors":"Yang Yu ,&nbsp;Tian-Peng Tang ,&nbsp;Lei Feng","doi":"10.1016/j.nuclphysb.2025.116910","DOIUrl":"10.1016/j.nuclphysb.2025.116910","url":null,"abstract":"<div><div>The singlet scalar dark matter (DM) model is a minimal extension of the Standard Model (SM). This model features only two free parameters: the singlet scalar mass <span><math><msub><mrow><mi>m</mi></mrow><mrow><mi>S</mi></mrow></msub></math></span> and the quartic coupling <span><math><msub><mrow><mi>a</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> between the singlet scalar and the SM Higgs doublet. Previous studies have suggested that only the resonant region remains viable under combined constraints. In this work, we revisit and refine the constraints using data from the direct detection experiment LUX-ZEPLIN(LZ), invisible Higgs decay measurements, and gamma-ray line observations conducted by Fermi-LAT and DAMPE. Our findings indicate that the latest results from LZ have significantly strengthened the constraints on the model parameters. We demonstrate that only a narrow parameter region remains viable, specifically <span><math><mn>60.5</mn><mspace></mspace><mtext>GeV</mtext><mo>&lt;</mo><msub><mrow><mi>m</mi></mrow><mrow><mi>S</mi></mrow></msub><mo>&lt;</mo><mn>62.5</mn><mspace></mspace><mtext>GeV</mtext></math></span> and <span><math><mn>1.7</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>4</mn></mrow></msup><mo>&lt;</mo><msub><mrow><mi>a</mi></mrow><mrow><mn>2</mn></mrow></msub><mo>&lt;</mo><mn>4.7</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>4</mn></mrow></msup></math></span>. This suggests that a three-fold improvement in the current LZ results would thoroughly examine the parameter space below <span><math><mn>1</mn><mspace></mspace><mrow><mi>TeV</mi></mrow></math></span> for the singlet scalar DM model.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1015 ","pages":"Article 116910"},"PeriodicalIF":2.5,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143843083","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":"When The Standard Model Higgs Meets Its Lighter 95 GeV Twin","authors":"Abdesslam Arhrib ,&nbsp;Khiem Hong Phan ,&nbsp;Van Que Tran ,&nbsp;Tzu-Chiang Yuan","doi":"10.1016/j.nuclphysb.2025.116909","DOIUrl":"10.1016/j.nuclphysb.2025.116909","url":null,"abstract":"<div><div>Recent reports from the Large Hadron Collider indicate two excesses: one in the lighter Higgs mass region around 95 GeV, and another in the rare <em>Zγ</em> final state of the Standard Model (SM) 125 GeV Higgs decay. These anomalies are analyzed within the minimal gauged two-Higgs-doublet model (G2HDM). A viable parameter space in G2HDM is identified that can account for both excesses. Within the viable parameter space, we find a strong correlation between the signal strengths of the SM 125 GeV Higgs decays into <em>γγ</em> and <em>Zγ</em> modes. However, this correlation does not extend to the lighter 95 GeV Higgs.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1015 ","pages":"Article 116909"},"PeriodicalIF":2.5,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143843084","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":"Flavored resonant leptogenesis in the U(1)X model","authors":"Garv Chauhan","doi":"10.1016/j.nuclphysb.2025.116908","DOIUrl":"10.1016/j.nuclphysb.2025.116908","url":null,"abstract":"&lt;div&gt;&lt;div&gt;We study the generation of baryon asymmetry through the flavored resonant leptogenesis in the &lt;span&gt;&lt;math&gt;&lt;mi&gt;U&lt;/mi&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;X&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; extension of the Standard Model. Being a generalization of the &lt;span&gt;&lt;math&gt;&lt;mi&gt;U&lt;/mi&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;B&lt;/mi&gt;&lt;mtext&gt;-&lt;/mtext&gt;&lt;mi&gt;L&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mi&gt;U&lt;/mi&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;X&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; is an ultraviolet-complete model of the right-handed neutrinos (RHNs), whose CP violating out-of-equilibrium decays lead to the generation of baryon asymmetry via leptogenesis. We can also explain the neutrino masses via the seesaw mechanism in this model. We consider three different cases for different &lt;span&gt;&lt;math&gt;&lt;mi&gt;U&lt;/mi&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;X&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; charges of the scalar particle responsible for &lt;span&gt;&lt;math&gt;&lt;mi&gt;U&lt;/mi&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;X&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; breaking at TeV-scale. These include the popular &lt;span&gt;&lt;math&gt;&lt;mi&gt;U&lt;/mi&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;B&lt;/mi&gt;&lt;mtext&gt;-&lt;/mtext&gt;&lt;mi&gt;L&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; and &lt;span&gt;&lt;math&gt;&lt;mi&gt;U&lt;/mi&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; models, as well as a &lt;span&gt;&lt;math&gt;&lt;mi&gt;U&lt;/mi&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; model which maximizes the collider signal. We numerically solve the flavored Boltzmann transport equations to calculate the total baryon asymmetry. We show that all three cases considered here can naturally explain the observed baryon asymmetry of the Universe in a large portion of the available parameter space, while satisfying the neutrino oscillation data. We find that the &lt;span&gt;&lt;math&gt;&lt;mi&gt;U&lt;/mi&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; case offers successful leptogenesis in a larger portion of the parameter space as compared to &lt;span&gt;&lt;math&gt;&lt;mi&gt;U&lt;/mi&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;B&lt;/mi&gt;&lt;mtext&gt;-&lt;/mtext&gt;&lt;mi&gt;L&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; and &lt;span&gt;&lt;math&gt;&lt;mi&gt;U&lt;/mi&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;. We also perform a comparative study between the flavored and unflavored leptogenesis parameter space. Finally, we also study the collider prospects for all these scenarios using the lepton number violating signal of &lt;span&gt;&lt;math&gt;&lt;mi&gt;p&lt;/mi&gt;&lt;mi&gt;p&lt;/mi&gt;&lt;mo&gt;→&lt;/mo&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;ℓ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mo&gt;±&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;ℓ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mo&gt;±&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;/math&gt;&lt;/span&gt;jets mediated by the &lt;span&gt;&lt;math&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mi&gt;Z&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mo&gt;′&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt; boson associated with &lt;span&gt;&lt;math&gt;&lt;mi&gt;U&lt;/mi&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1015 ","pages":"Article 116908"},"PeriodicalIF":2.5,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143832551","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":"Scalar field dynamics in non-minimally coupled theories via the Noether symmetry and the Eisenhart-Duval lift","authors":"Ahmadfikri Talek ,&nbsp;Narakorn Kaewkhao ,&nbsp;Watcharakorn Srikom ,&nbsp;Farruh Atamurotov ,&nbsp;Phongpichit Channuie","doi":"10.1016/j.nuclphysb.2025.116907","DOIUrl":"10.1016/j.nuclphysb.2025.116907","url":null,"abstract":"<div><div>This study investigates the dynamics of a non-minimally coupled (NMC) scalar field in modified gravity, employing the Noether gauge symmetry (NGS) approach to systematically derive exact cosmological solutions. By formulating a point-like Lagrangian and analyzing the corresponding Euler–Lagrange equations, conserved quantities were identified, reducing the complexity of the dynamical system. Through the application of Noether symmetry principles, the scalar field potential was found to follow a power-law form, explicitly dependent on the coupling parameter <em>ξ</em>, influencing the evolution of the universe. The study further explores inflationary dynamics, showing that for specific values of <em>ξ</em>, the potential resembles the Higgs-like structure, contributing to a deeper understanding of early cosmic expansion. To enhance the theoretical framework, the Eisenhart lift method was introduced, providing a geometric interpretation of the system by embedding the dynamical variables within an extended field space. This approach established a connection between the kinetic terms and Killing vectors, offering an alternative perspective on the conserved quantities. The study also derived geodesic equations governing the evolution of the system, reinforcing the link between symmetry-based techniques and fundamental cosmological properties.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1015 ","pages":"Article 116907"},"PeriodicalIF":2.5,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143828799","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":"Shadow and quasinormal modes of GUP corrected Grumiller black holes","authors":"Ahmad Al-Badawi ,&nbsp;Dhruba Jyoti Gogoi ,&nbsp;Yassine Sekhmani ,&nbsp;Kuantay Boshkayev","doi":"10.1016/j.nuclphysb.2025.116900","DOIUrl":"10.1016/j.nuclphysb.2025.116900","url":null,"abstract":"<div><div>This study investigates the shadows, scalar perturbations, and quasinormal modes (QNMs) of Grumiller black holes (BHs) within the framework of the Generalized Uncertainty Principle (GUP). The GUP introduces quantum corrections that are most significant near the event horizon, while the Rindler acceleration parameter predominantly influences the spacetime at larger distances. We derive analytical expressions for the photon sphere and shadow radii, showing that quantum corrections cause both to decrease. Additionally, we explore the dynamics of massless scalar perturbations and compute the quasinormal frequencies using the higher-order WKB approximation, supported by time-domain analysis. Our results indicate that while the Rindler acceleration significantly impacts the oscillation frequency and damping rate of gravitational wave (GW) ring downs, the effect of the GUP parameters is relatively small. This work clarifies how these distinct influences operate in different regions of the black hole spacetime and provides valuable insights into the quantum-corrected features of black holes, including their shadows and QNMs.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1015 ","pages":"Article 116900"},"PeriodicalIF":2.5,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143826239","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":"Myrzakulov gravity in vielbein formalism: A study in Weitzenböck spacetime","authors":"Davood Momeni ,&nbsp;Ratbay Myrzakulov","doi":"10.1016/j.nuclphysb.2025.116903","DOIUrl":"10.1016/j.nuclphysb.2025.116903","url":null,"abstract":"<div><div>The quest to understand the nature of gravity and its role in shaping the universe has led to the exploration of modified gravity theories. One of the pioneering contributions in this field is the Myrzakulov gravity theory, which incorporates both curvature and torsion. In this work, we investigate the effects of torsion within the framework of <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><mi>T</mi><mo>)</mo></math></span>-gravity, a modification of General Relativity that incorporates both curvature and torsion.</div><div>We present this theory in the Vielbein formalism, a covariant approach that provides a more flexible and geometric perspective on gravity, ensuring the theory's consistency under general coordinate transformations. This formalism is particularly powerful in the context of Weitzenböck spacetime, where torsion plays a significant role in the description of gravitational interactions. By studying <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><mi>T</mi><mo>)</mo></math></span>-gravity in Vielbein formalism, we aim to extend the applicability of Myrzakulov's theory, providing a deeper understanding of its cosmological and astrophysical implications.</div><div>We examine the profound effects of this theory on various astrophysical phenomena, including black holes, gravitational waves, and compact objects like neutron stars. By exploring how torsion modifies the behavior of these extreme systems, we uncover new avenues for testing gravity in the strong-field regime. Our results suggest that torsion could lead to observable deviations in black hole thermodynamics, gravitational wave propagation, and the structure of dense matter.</div><div>The modifications we uncover have the potential to provide unprecedented insights into the nature of spacetime and gravity, offering a novel perspective on the fundamental forces that govern the cosmos. This work paves the way for future observational and theoretical studies that could reveal the deeper, hidden aspects of gravity, possibly rewriting our understanding of the universe's most enigmatic phenomena. Through both observational data and theoretical advancements, we present a compelling case for the exploration of <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><mi>T</mi><mo>)</mo></math></span>-gravity as a powerful tool in the search for new physics beyond General Relativity.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1015 ","pages":"Article 116903"},"PeriodicalIF":2.5,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143815879","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":"To B or not to be in single-trace TT¯ holography","authors":"Amit Giveon,&nbsp;Daniel Vainshtein","doi":"10.1016/j.nuclphysb.2025.116905","DOIUrl":"10.1016/j.nuclphysb.2025.116905","url":null,"abstract":"<div><div>Superstring theory on black-strings backgrounds, corresponding to deformed, rotating BTZ black holes, formed near <em>k</em> NS5 branes by <em>p</em> fundamental strings or <em>negative</em> strings, is inspected. For <em>non</em>-rotating black strings, in the positive case, it was shown in <span><span>[1]</span></span> that the excitation energy of a probe long string, plus its contribution to the black-string background, <span><math><mn>1</mn><mo>/</mo><mi>p</mi></math></span> fraction of the black-string energy, is the same as that in <span><math><mi>T</mi><mover><mrow><mi>T</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> deformed <span><math><mi>C</mi><mi>F</mi><msub><mrow><mi>T</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> with <span><math><mi>c</mi><mo>=</mo><mn>6</mn><mi>k</mi></math></span>, if the <em>B</em>-field vanishes at the origin. This supports the claim that the black string can be thought of as a state in a symmetric product of <em>p</em> <span><math><mi>C</mi><mi>F</mi><msub><mrow><mi>T</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span>'s with central charge <span><math><mi>c</mi><mo>=</mo><mn>6</mn><mi>k</mi></math></span>, where the black-string energy is split equally among all <em>p</em> factors. In <span><span>[1]</span></span>, it was not verified that this property persists in other cases. Here, we generalize the investigation of <span><span>[1]</span></span> to the superstring on deformed, <em>rotating</em> BTZ black holes, for both the positive and negative cases. We find the particular value of the <em>B</em>-field at the origin, for which the total energy of a probe long string, consisting of its excitation energy plus its contribution to the <span><math><mn>1</mn><mo>/</mo><mi>p</mi></math></span> fraction of the black-string energy, is the same as that in <span><math><mi>T</mi><mover><mrow><mi>T</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> deformed <span><math><mi>C</mi><mi>F</mi><msub><mrow><mi>T</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> with <span><math><mi>c</mi><mo>=</mo><mn>6</mn><mi>k</mi></math></span>. Interestingly, the <em>B</em>-field required for this harmony with single-trace <span><math><mi>T</mi><mover><mrow><mi>T</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> holography, does <em>not</em> vanish at the origin in the <em>rotating</em> cases.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1015 ","pages":"Article 116905"},"PeriodicalIF":2.5,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143826241","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":"Charged anisotropic pulsar SAX J1748.9-2021 in non-Riemannian geometry","authors":"M. Sharif ,&nbsp;Iqra Ibrar","doi":"10.1016/j.nuclphysb.2025.116896","DOIUrl":"10.1016/j.nuclphysb.2025.116896","url":null,"abstract":"<div><div>In this paper, we investigate the impact of charge on the stability of the pulsar star SAX J1748.9-2021 within the context of <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>,</mo><mi>T</mi><mo>)</mo></math></span> theory, where <span><math><mi>Q</mi></math></span> and <span><math><mi>T</mi></math></span> represent the non-metricity scalar and the energy-momentum tensor, respectively. To achieve this, we employ the Krori-Barua metric ansatz with anisotropic fluid. We obtain exact relativistic solutions for the corresponding field equations. Additionally, we examine its physical and geometric properties using astrophysical observations of the pulsar SAX J1748.9-2021. This approach provides a basis for connecting several physical quantities, including fluid parameters, anisotropy, mass-radius relationship, compactness, redshift, <em>energy</em>, the Zeldovich and causality conditions, equation of state parameter, adiabatic index and the Tolman-Oppenheimer-Volkoff equation. Our findings align with observational evidence, indicating that the pulsar SAX J1748.9-2021 remains both feasible and stable under this modified theory.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1015 ","pages":"Article 116896"},"PeriodicalIF":2.5,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143815880","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":"Barrow holographic dark energy with varying exponent","authors":"Spyros Basilakos ,&nbsp;Andreas Lymperis ,&nbsp;Maria Petronikolou ,&nbsp;Emmanuel N. Saridakis","doi":"10.1016/j.nuclphysb.2025.116904","DOIUrl":"10.1016/j.nuclphysb.2025.116904","url":null,"abstract":"<div><div>We construct Barrow holographic dark energy with varying exponent. Such an energy-scale-dependent behavior is typical in quantum field theory and quantum gravity under renormalization group considerations, however in the present scenario it has an additional justification, since in realistic cases one expects that Barrow entropy quantum-gravitational effects to be stronger at early times and to smooth out and disappear at late times. We impose specific, redshift-dependent ansätze for the Barrow running exponent, such as the linear, CPL-like, exponential, and trigonometric ones, and we investigate their cosmological behavior. We show that we can recover the standard thermal history of the universe, with the sequence of matter and dark energy epochs, in which the transition from deceleration to acceleration happens at <span><math><mi>z</mi><mo>≈</mo><mn>0.65</mn></math></span>, in agreement with observations. In the most realistic case of hyperbolic tangent ansatz, in which we can easily bound Barrow exponent inside its theoretically determined bounds 0 and 1 for all redshifts, we see that the dark-energy equation-of-state parameter can be quintessence like, or experience the phantom-divide crossing, while in the future it can either tend to the cosmological constant value or start increasing again. All these features reveal that Barrow holographic dark energy with varying exponent is not only theoretically more justified than the standard, constant-exponent case, but it leads to richer cosmological behavior too.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1015 ","pages":"Article 116904"},"PeriodicalIF":2.5,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143843089","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":"Perfect fluid dynamics with conformal Newton-Hooke symmetries","authors":"Timofei Snegirev","doi":"10.1016/j.nuclphysb.2025.116902","DOIUrl":"10.1016/j.nuclphysb.2025.116902","url":null,"abstract":"<div><div>Perfect fluid equations are formulated which are invariant under the <em>ℓ</em>-conformal Newton-Hooke group for an arbitrary integer or half-integer value of the parameter <em>ℓ</em>. For <span><math><mi>ℓ</mi><mo>=</mo><mfrac><mrow><mn>3</mn></mrow><mrow><mn>2</mn></mrow></mfrac></math></span> the corresponding conserved charges are constructed and the Hamiltonian formulation is built.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1015 ","pages":"Article 116902"},"PeriodicalIF":2.5,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143816020","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}