Nuclear Physics B最新文献

{"title":"Mixed solutions to the Liouville equation","authors":"Sujay K. Ashok ,&nbsp;Jan Troost","doi":"10.1016/j.nuclphysb.2025.117127","DOIUrl":"10.1016/j.nuclphysb.2025.117127","url":null,"abstract":"<div><div>We enlarge the set of explicit classical solutions to the Liouville equation with three singularities to the cases with mixed hyperbolic and elliptic monodromies. We analyze the large hyperbolic monodromy limit of the solutions and the farthest geodesics looping one hyperbolic singularity. These two-dimensional geometries describe a time-symmetric spatial slice of a solution to three-dimensional general relativity. The geodesics are reinterpreted as snapshots of horizons of evolving black holes. We study the spatial slice with three horizons of very heavy black holes in some detail. We use uniform saddle point integration to present the Liouville and heavy black hole geometries in terms of simpler special functions. These make a detailed analysis of mixed particle and black hole geometries possible.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1019 ","pages":"Article 117127"},"PeriodicalIF":2.8,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145158671","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":"Thermodynamics of the arbitrary dimensional FRW universe: Joule-Thomson expansion","authors":"Haximjan Abdusattar ,&nbsp;Shi-Bei Kong ,&nbsp;Minawar Omar ,&nbsp;Zhong-Wen Feng","doi":"10.1016/j.nuclphysb.2025.117126","DOIUrl":"10.1016/j.nuclphysb.2025.117126","url":null,"abstract":"<div><div>In this paper, we investigate the thermodynamics especially the Joule-Thomson expansion of the <span><math><mi>n</mi></math></span>-dimensional FRW (Friedmann-Robertson-Walker) universe with a perfect fluid. We derive the thermodynamic equations of state <span><math><mrow><mi>P</mi><mo>=</mo><mi>P</mi><mo>(</mo><mi>V</mi><mo>,</mo><mi>T</mi><mo>)</mo></mrow></math></span> for the <span><math><mi>n</mi></math></span>-dimensional FRW universe in Einstein gravity and Einstein-Gauss-Bonnet gravity, where the thermodynamic pressure <span><math><mi>P</mi></math></span> is defined by the work density <span><math><mi>W</mi></math></span> of the perfect fluid, <span><math><mrow><mi>i</mi><mo>.</mo><mi>e</mi><mo>.</mo></mrow></math></span> <span><math><mrow><mi>P</mi><mo>≡</mo><mi>W</mi></mrow></math></span>. Furthermore, we present the Joule-Thomson expansion as an application of these equations of state to elucidate the cooling-heating properties of the <span><math><mi>n</mi></math></span>-dimensional FRW universe. We determine the inversion temperature and inversion pressure in the FRW universe with arbitrary dimensions for the first time, and illustrate the characteristics of inversion curves and isenthalpic curves in the <span><math><mrow><mi>T</mi><mo>−</mo><mi>P</mi></mrow></math></span> plane. We also examine constraints on the perfect fluid in the FRW universe, as derived from the cooling-heating transition point. This study offers insights into deepening our comprehension of cooling and heating regions in the FRW universe, thereby revealing its expansion mechanisms.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1019 ","pages":"Article 117126"},"PeriodicalIF":2.8,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145158669","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":"Astrophysical signatures of exact anisotropic stellar solutions: Dynamics of two pulsars within the context of Rastall theory","authors":"Tayyab Naseer ,&nbsp;M. Sharif ,&nbsp;Fatima Chand ,&nbsp;B. Alshahrani ,&nbsp;Mona Mahmoud","doi":"10.1016/j.nuclphysb.2025.117125","DOIUrl":"10.1016/j.nuclphysb.2025.117125","url":null,"abstract":"<div><div>This study proposes a couple of analytical solutions that characterize the anisotropic dense celestial bodies within the Rastall theoretical framework. The analysis presumes a spherically symmetric matter arrangement under which the system of gravitational equations is derived. By utilizing well-established radial metric functions and merging them with the two principal pressures, we obtain differential equations related to <span><math><msub><mi>g</mi><mrow><mi>t</mi><mi>t</mi></mrow></msub></math></span> component. Subsequently, we perform the integration of these equations to determine the remaining geometric quantity that encompasses various integration constants. The proposed interior solutions are then matched with the Schwarzschild exterior metric at the boundary of the compact object, facilitating the determination of the constants. Additionally, the incorporation of the non-minimal coupling parameter into these constants is accomplished by enforcing the null radial pressure at the boundary. Afterwards, we rigorously examine the physical characteristics and critical stability conditions of the formulated models under observational data from two pulsars, say LMC X-4 and 4U 1820-30. It is concluded that our models are well-aligned with essential criteria required to ensure the physical viability of stellar structures, subject to specific parametric values.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1019 ","pages":"Article 117125"},"PeriodicalIF":2.8,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145121029","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":"Probing phase transitions and microscopic interactions in quasi-topological black holes","authors":"Apurba Tiwari ,&nbsp;Randeep Kaur ,&nbsp;Aruri Devaraju ,&nbsp;Jaya Prakash Kode ,&nbsp;Apparao Damarasingu ,&nbsp;Silamanthula Hari Krishna ,&nbsp;Akshay Gharat","doi":"10.1016/j.nuclphysb.2025.117110","DOIUrl":"10.1016/j.nuclphysb.2025.117110","url":null,"abstract":"<div><div>In this paper, we examine the thermodynamic geometry of four-dimensional quasi-topological black holes by computing the Ruppeiner scalar curvature <span><math><mi>R</mi></math></span> which serves as an empirical tool to describe the nature of interactions among black hole microstructures. In four dimensions, we write novel black hole solutions within the framework of generalized quasi-topological gravity, extended through a fundamental <span><math><mi>p</mi></math></span>-form field. Temperature, entropy, and thermodynamic volume are explicitly expressed using the extended first law. The nature of the interactions between the microstructure is then revealed by computing <span><math><mi>R</mi></math></span>, where positive curvature indicates repulsion dominant interactions and negative curvature indicates the dominance of attraction. Our approach uses divergences and sign changing nature of <span><math><mi>R</mi></math></span> to identify critical points and phase transitions. Further, our analysis reveals a notably streamlined thermodynamic behavior, a single zero-crossing of curvature <span><math><mi>R</mi></math></span>, marking a second-order phase transition and offering direct insight into the underlying microstructure interactions.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1019 ","pages":"Article 117110"},"PeriodicalIF":2.8,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145158668","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":"Observational constraints on cosmic expansion in f(R,Lm,T) gravity","authors":"M. Koussour ,&nbsp;M.K.M. Ali ,&nbsp;S. Muminov ,&nbsp;J. Rayimbaev","doi":"10.1016/j.nuclphysb.2025.117123","DOIUrl":"10.1016/j.nuclphysb.2025.117123","url":null,"abstract":"&lt;div&gt;&lt;div&gt;The late-time acceleration of the universe remains one of the central challenges in modern cosmology, motivating both dynamical dark energy models and extensions of general relativity. In this work, we investigate the cosmology of the recently proposed &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;msub&gt;&lt;mi&gt;L&lt;/mi&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;/msub&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; gravity framework, which generalizes the &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; and &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;msub&gt;&lt;mi&gt;L&lt;/mi&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;/msub&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; models by incorporating the Ricci scalar &lt;span&gt;&lt;math&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;, the matter Lagrangian &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mi&gt;L&lt;/mi&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;, and the trace of the energy-momentum tensor &lt;span&gt;&lt;math&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; within a unified gravitational action. By adopting the simplest functional form &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;f&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;msub&gt;&lt;mi&gt;L&lt;/mi&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;/msub&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;mi&gt;α&lt;/mi&gt;&lt;msub&gt;&lt;mi&gt;L&lt;/mi&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;/msub&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;mi&gt;β&lt;/mi&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;mi&gt;γ&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, we derive modified Friedmann equations in a dust-dominated FLRW background and constrain the parameters &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;msub&gt;&lt;mi&gt;H&lt;/mi&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/msub&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mi&gt;α&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mi&gt;β&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mi&gt;γ&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; using cosmic chronometers (CC), Type Ia supernovae from the PantheonPlus (PP)+SH0ES compilation, and their joint dataset. The inferred Hubble constant values are &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;H&lt;/mi&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/msub&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;68.69&lt;/mn&gt;&lt;mo&gt;±&lt;/mo&gt;&lt;mn&gt;0.52&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; km/s/Mpc (CC), &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;72.75&lt;/mn&gt;&lt;mo&gt;±&lt;/mo&gt;&lt;mn&gt;0.15&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; km/s/Mpc (PP+SH0ES), and &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;72&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;msubsup&gt;&lt;mn&gt;68&lt;/mn&gt;&lt;mrow&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;mn&gt;0.12&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;mn&gt;0.15&lt;/mn&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; km/s/Mpc (Joint), while the corresponding deceleration parameters are &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;q&lt;/mi&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/msub&gt;&lt;mo&gt;∼&lt;/mo&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;mn&gt;0.561&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;q&lt;/mi&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/msub&gt;&lt;mo&gt;∼&lt;/mo&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;mn&gt;0.451&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, and &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;q&lt;/mi&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/msub&gt;&lt;mo&gt;∼&lt;/mo&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;mn&gt;0.458&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, respectively. Notably, the obtained &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mi&gt;H&lt;/mi&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; values lie between early-universe and local measurements, indicating that the model can accommodate both low- and high-redshift datasets, partially easing the Hubble tension. The &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;z&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; diagnostic analyses reveal a quintessence-like evolution of the cosmic energy density, distinguishing this framework from the standard &lt;span&gt;","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1019 ","pages":"Article 117123"},"PeriodicalIF":2.8,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145158667","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":"Equatorial light bending around a Hairy Kiselev black hole","authors":"Shrishti Kukreti ,&nbsp;Shubham Kala ,&nbsp;Hemwati Nandan ,&nbsp;Faizuddin Ahmed ,&nbsp;Saswati Roy","doi":"10.1016/j.nuclphysb.2025.117124","DOIUrl":"10.1016/j.nuclphysb.2025.117124","url":null,"abstract":"<div><div>We investigate the deflection angle of light rays confined to the equatorial plane of a Hairy Kiselev black hole. The analysis includes a thorough study of the horizon structure and critical parameters, leading to an analytic expression for the deflection angle in terms of elliptic integrals. Our results confirm that the deflection angle decreases with increasing impact parameter, in agreement with classical predictions of gravitational lensing. The influence of the scalar field, characterized by the coupling constant, shows a nontrivial effect: while moderate values of the coupling constant initially enhance light bending, further increases lead to a suppression of the deflection in the strong-field regime due to modifications in spacetime geometry. Comparative analysis among the Schwarzschild, Kiselev, and Hairy Kiselev black holes indicates that the presence of a quintessence-like field tends to enhance the deflection, whereas the scalar hair component reduces it. Further, we investigate the angular shadow radius of the Hairy Kiselev black hole for a static observer and analyze how mass-dependent variations affect the shadow features. These findings underscore the significant role of scalar fields and exotic matter distributions in shaping light propagation in a modified gravity scenario.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1019 ","pages":"Article 117124"},"PeriodicalIF":2.8,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145121028","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":"Reconstructing configurational Hamiltonians from Fock space","authors":"Davood Momeni","doi":"10.1016/j.nuclphysb.2025.117119","DOIUrl":"10.1016/j.nuclphysb.2025.117119","url":null,"abstract":"<div><div>We present a unified operator-based framework for reconstructing configuration-space Hamiltonians directly from their Fock-space formulations. This approach clarifies how local dynamics and geometric structure emerge from global quantum operator algebras. Beginning with elementary systems such as the harmonic oscillator, we extend the method to scalar and vector fields in both flat and curved spacetimes. By systematically inverting creation and annihilation operators, we recover local expressions involving canonical fields and their conjugate momenta. Applications include free and interacting scalar fields, Abelian and non-Abelian gauge theories, and massless spin-2 graviton modes. We further explore the Sachdev-Ye-Kitaev (SYK) and double-scaled SYK models, showing how bilocal collective fields and emergent infrared geometries arise from quartic Fock-space interactions. This reconstruction framework reveals a deep structural unity across quantum mechanics, field theory, gauge dynamics, and holography, and opens new avenues for studying locality, emergent geometry, and duality in quantum systems.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1019 ","pages":"Article 117119"},"PeriodicalIF":2.8,"publicationDate":"2025-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145096509","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":"Courant algebroid without constraints on fluxes on its Dirac structures","authors":"Ilija Ivanišević,&nbsp;Branislav Sazdović","doi":"10.1016/j.nuclphysb.2025.117122","DOIUrl":"10.1016/j.nuclphysb.2025.117122","url":null,"abstract":"<div><div>We examine the standard Courant bracket and its extensions, defined by twists with different <span><math><mrow><mi>O</mi><mo>(</mo><mi>D</mi><mo>,</mo><mi>D</mi><mo>)</mo></mrow></math></span> transformations relevant to string theory. We analyze Dirac structures on these Courant algebroids and derive the constraints they impose on fluxes. In the end, we show that the Courant algebroid simultaneously twisted by both <span><math><mi>B</mi></math></span> and <span><math><mi>θ</mi></math></span> is characterized by Dirac structures with no restrictions on fluxes.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1019 ","pages":"Article 117122"},"PeriodicalIF":2.8,"publicationDate":"2025-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145096506","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":"Dynamics of spinning particles around the Reissner-Nordstrom-like black hole","authors":"Gulnisa Abdukayumova ,&nbsp;Farruh Atamurotov ,&nbsp;Ahmadjon Abdujabbarov ,&nbsp;Phongpichit Channuie ,&nbsp;G. Mustafa","doi":"10.1016/j.nuclphysb.2025.117121","DOIUrl":"10.1016/j.nuclphysb.2025.117121","url":null,"abstract":"<div><div>In this paper, we examined the motion of a spinning particle around a Reissner-Nordström-like black hole. Initially, we analyze the dynamics of the spinning test particles using the Mathisson–Papapetrou–Dixon equation. Subsequently, we derive the effective potential and examine it for the parameter of the Reissner-Nordström-like black hole. We then examine the impact of the particle’s spin on the innermost stable circular orbits (ISCO), specific angular momentum, and energy at ISCO for different parameters of hairy black holes. Furthermore, we determine the critical values of the particle’s spin <span><math><mi>s</mi></math></span>, above which time-like particles become non-physical and space-like. Furthermore, we plot and discuss the variation of the critical spin values for different values of <span><math><mi>l</mi></math></span> and charge <span><math><mi>Q</mi></math></span>. Additionally, particle trajectories near a Reissner-Nordström-like (RN-like) black hole are examined for different spacetime and particle parameters. In conclusion, we analyze the center-of-mass of two spinning particles colliding near the boundary of the hairy black hole.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1019 ","pages":"Article 117121"},"PeriodicalIF":2.8,"publicationDate":"2025-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145109558","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":"Probing Planck scale effects on absolute mass limit in neutrino flavor evolution","authors":"Kartik Joshi ,&nbsp;Sanjib Dey ,&nbsp;Satyajit Jena","doi":"10.1016/j.nuclphysb.2025.117118","DOIUrl":"10.1016/j.nuclphysb.2025.117118","url":null,"abstract":"<div><div>This work explores how the generalized uncertainty principle, a theoretical modification of the Heisenberg uncertainty principle inspired by quantum gravity, affects neutrino flavor oscillations. By extending the standard two-flavor neutrino model, we show that the oscillation probability acquires an additional phase term that depends on the square roots of the individual neutrino masses, introducing new features beyond the conventional mass-squared differences. To account for the non-Hermitian nature of the resulting dynamics, we employ parity-time (<span><math><mrow><mi>P</mi><mi>T</mi></mrow></math></span>) symmetric quantum mechanics, which allows for consistent descriptions of systems with balanced gain and loss mechanisms. We analyze the feasibility of observing these effects in current and future neutrino experiments, such as DUNE, JUNO, IceCube, ORCA–KM3NeT, MINOS, Daya Bay, Hyper-Kamiokande, and KATRIN, and find that the predicted modifications could fall within the sensitivity of current experiments. Moreover, we propose that analog quantum simulation platforms, such as cold atoms, trapped ions, and photonic systems, offer a promising route to test these predictions under controlled conditions. Our findings suggest that neutrino oscillations may serve as an effective probe of quantum gravity effects, providing a novel connection between fundamental theory and experimental observables.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1019 ","pages":"Article 117118"},"PeriodicalIF":2.8,"publicationDate":"2025-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145096505","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}