Pub Date : 2026-01-06DOI: 10.1016/j.nuclphysb.2025.117292
Roman Zwicky
Shift symmetry forbids conformal coupling of Goldstone bosons from internal symmetries, but not for spontaneously broken conformal symmetry. Its Goldstone boson, the dilaton D, requires the improvement term to realise the Goldstone matrix element in the effective theory. The dilaton can be used for Weyl-gauging and conformally couple to particles of any Weyl-weight. While improvement does not affect scattering amplitudes in flat space, it impacts gravitational form factors decisively, giving rise to the dilaton pole in the spin-zero channel. We compute leading-order scalar, fermion, pion and dilaton form factors, including the treatment soft breaking by a relevant perturbation. We show that a pion low-energy theorem enforces the operator driving spontaneous chiral symmetry breaking to be of scaling dimension at the fixed point.
{"title":"Dilatons improve (non)-Goldstones","authors":"Roman Zwicky","doi":"10.1016/j.nuclphysb.2025.117292","DOIUrl":"10.1016/j.nuclphysb.2025.117292","url":null,"abstract":"<div><div>Shift symmetry forbids conformal coupling of Goldstone bosons from internal symmetries, but not for spontaneously broken conformal symmetry. Its Goldstone boson, the dilaton <em>D</em>, requires the improvement term <span><math><mrow><msub><mi>L</mi><mi>R</mi></msub><mo>∝</mo><mi>R</mi><msup><mi>e</mi><mrow><mo>−</mo><mn>2</mn><mi>D</mi><mo>/</mo><msub><mi>F</mi><mi>D</mi></msub></mrow></msup></mrow></math></span> to realise the Goldstone matrix element in the effective theory. The dilaton can be used for Weyl-gauging and conformally couple to particles of any Weyl-weight. While improvement does not affect scattering amplitudes in flat space, it impacts gravitational form factors decisively, giving rise to the dilaton pole in the spin-zero channel. We compute leading-order scalar, fermion, pion and dilaton form factors, including the treatment soft breaking by a relevant perturbation. We show that a pion low-energy theorem enforces the operator driving spontaneous chiral symmetry breaking to be of scaling dimension <span><math><mrow><mstyle><mi>Δ</mi></mstyle><mo>=</mo><mi>d</mi><mo>−</mo><mn>2</mn></mrow></math></span> at the fixed point.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1023 ","pages":"Article 117292"},"PeriodicalIF":2.8,"publicationDate":"2026-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145941323","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}
We have investigated vacuum polarization of a quantized charged massive scalar field in the presence of a magnetic topological defect, modeled as an impenetrable tube of finite thickness carrying magnetic flux. At the tube’s surface, we imposed a general Robin boundary condition. Our analysis demonstrates that, in flat space-time, the total induced vacuum energy is independent of the coupling ξ of the scalar field’s interaction with the space-time curvature only in the special cases of Dirichlet and Neumann boundary conditions. For general Robin boundary conditions, however, the total induced vacuum energy depends on the coupling ξ in a flat space-time and exhibits a nontrivial dependence on the parameter of the Robin boundary condition. We investigated the dependence of this effect not only on Robin’s boundary condition parameter, but also on the tube thickness and the space-time dimensionality. We conclude that careful measurements of vacuum polarization effects in flat space-time may, in principle, provide an independent way to probe the ξ coupling.
{"title":"Impact of space-time curvature coupling on the vacuum energy induced by a magnetic topological defect in flat space-time of arbitrary dimension","authors":"V.M. Gorkavenko , O.V. Barabash , I.V. Ivanchenko , P.O. Nakaznyi , M.S. Tsarenkova , N.S. Yakovenko , A.O. Zaporozhchenko","doi":"10.1016/j.nuclphysb.2026.117296","DOIUrl":"10.1016/j.nuclphysb.2026.117296","url":null,"abstract":"<div><div>We have investigated vacuum polarization of a quantized charged massive scalar field in the presence of a magnetic topological defect, modeled as an impenetrable tube of finite thickness carrying magnetic flux. At the tube’s surface, we imposed a general Robin boundary condition. Our analysis demonstrates that, in flat space-time, the total induced vacuum energy is independent of the coupling <em>ξ</em> of the scalar field’s interaction with the space-time curvature only in the special cases of Dirichlet and Neumann boundary conditions. For general Robin boundary conditions, however, the total induced vacuum energy depends on the coupling <em>ξ</em> in a flat space-time and exhibits a nontrivial dependence on the parameter of the Robin boundary condition. We investigated the dependence of this effect not only on Robin’s boundary condition parameter, but also on the tube thickness and the space-time dimensionality. We conclude that careful measurements of vacuum polarization effects in flat space-time may, in principle, provide an independent way to probe the <em>ξ</em> coupling.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1023 ","pages":"Article 117296"},"PeriodicalIF":2.8,"publicationDate":"2026-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145980628","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}
Pub Date : 2026-01-05DOI: 10.1016/j.nuclphysb.2026.117295
Muhammad Sharif , Adeeba Arooj
This manuscript discusses feasible features of anisotropic celestial sphere within the framework of gravity, where represents non-metricity scalar and is the matter Lagrangian. The geometric configuration of static spherical symmetric structure is examined using a specific non-singular solution (Krori-Barua solution). A particular model of this theory is considered to derive explicit field equations. The Darmois matching conditions are used to evaluate unknown constants in the metric coefficients. To verify plausible existence of compact objects in this gravitational framework, we analyze their fundamental physical properties including fluid parameters, gradients, surface redshift, mass-radius relation, anisotropy measure, compactness factor, energy conditions and equations of state. The stability of the considered stellar objects is verified by adiabatic index and sound speed. Our results demonstrate that all required physical conditions are satisfied, confirming the existence of physically stable anisotropic celestial objects within this modified gravity.
{"title":"Stability and physical properties of compact stars beyond Einstein gravity","authors":"Muhammad Sharif , Adeeba Arooj","doi":"10.1016/j.nuclphysb.2026.117295","DOIUrl":"10.1016/j.nuclphysb.2026.117295","url":null,"abstract":"<div><div>This manuscript discusses feasible features of anisotropic celestial sphere within the framework of <span><math><mrow><mi>f</mi><mo>(</mo><mi>Q</mi><mo>,</mo><msub><mi>L</mi><mi>m</mi></msub><mo>)</mo></mrow></math></span> gravity, where <span><math><mi>Q</mi></math></span> represents non-metricity scalar and <span><math><msub><mi>L</mi><mi>m</mi></msub></math></span> is the matter Lagrangian. The geometric configuration of static spherical symmetric structure is examined using a specific non-singular solution (Krori-Barua solution). A particular model of this theory is considered to derive explicit field equations. The Darmois matching conditions are used to evaluate unknown constants in the metric coefficients. To verify plausible existence of compact objects in this gravitational framework, we analyze their fundamental physical properties including fluid parameters, gradients, surface redshift, mass-radius relation, anisotropy measure, compactness factor, energy conditions and equations of state. The stability of the considered stellar objects is verified by adiabatic index and sound speed. Our results demonstrate that all required physical conditions are satisfied, confirming the existence of physically stable anisotropic celestial objects within this modified gravity.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1023 ","pages":"Article 117295"},"PeriodicalIF":2.8,"publicationDate":"2026-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145941322","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}
Pub Date : 2026-01-03DOI: 10.1016/j.nuclphysb.2026.117294
Sebastiano Segreto , Matteo Bruno
We analyze the issue of unitary equivalence within Generalized Uncertainty Principle (GUP) theories in the one-dimensional case. For a deformed Heisenberg algebra, its representation in terms of Hilbert space and conjugate operators is not uniquely determined, raising the question of whether different realizations of the same algebra are equivalent and describe the same physics. After proposing a definition of a quantum GUP theory, we establish conditions for unitary equivalence. Using this framework, we rigorously prove that two commonly used representations are unitarily equivalent, specifying the conditions under which this equivalence holds. We demonstrate this equivalence explicitly by providing a unitary map and showing how both GUP formulations yield the same physical results in two examples: the quantum harmonic oscillator and a free-falling particle. Finally, we discuss a case in which equivalence fails, suggesting that a generalization of the Stone-von Neumann theorem may not be possible within the GUP framework under our definition of unitary equivalence.
{"title":"Unitary equivalence in generalized uncertainty principle theories","authors":"Sebastiano Segreto , Matteo Bruno","doi":"10.1016/j.nuclphysb.2026.117294","DOIUrl":"10.1016/j.nuclphysb.2026.117294","url":null,"abstract":"<div><div>We analyze the issue of unitary equivalence within Generalized Uncertainty Principle (GUP) theories in the one-dimensional case. For a deformed Heisenberg algebra, its representation in terms of Hilbert space and conjugate operators is not uniquely determined, raising the question of whether different realizations of the same algebra are equivalent and describe the same physics. After proposing a definition of a quantum GUP theory, we establish conditions for unitary equivalence. Using this framework, we rigorously prove that two commonly used representations are unitarily equivalent, specifying the conditions under which this equivalence holds. We demonstrate this equivalence explicitly by providing a unitary map and showing how both GUP formulations yield the same physical results in two examples: the quantum harmonic oscillator and a free-falling particle. Finally, we discuss a case in which equivalence fails, suggesting that a generalization of the Stone-von Neumann theorem may not be possible within the GUP framework under our definition of unitary equivalence.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1023 ","pages":"Article 117294"},"PeriodicalIF":2.8,"publicationDate":"2026-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145941339","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}
Pub Date : 2026-01-02DOI: 10.1016/j.nuclphysb.2025.117290
P.T. Kirakosiants , D.A. Valerev , M.A. Vasiliev
The recently proposed differential homotopy approach to the analysis of nonlinear higher-spin theory is developed. The Ansatz is extended to the form applicable in the second order of the perturbation theory and general star-multiplication formulae are derived. The relation of the shifted homotopy and differential homotopy formalisms is worked out. Projectively-compact spin-local quadratic (anti)holomorphic vertices in the one-form sector of higher-spin equations are obtained within the differential homotopy formalism.
{"title":"Quadratic corrections to the higher-spin equations by the differential homotopy approach","authors":"P.T. Kirakosiants , D.A. Valerev , M.A. Vasiliev","doi":"10.1016/j.nuclphysb.2025.117290","DOIUrl":"10.1016/j.nuclphysb.2025.117290","url":null,"abstract":"<div><div>The recently proposed differential homotopy approach to the analysis of nonlinear higher-spin theory is developed. The Ansatz is extended to the form applicable in the second order of the perturbation theory and general star-multiplication formulae are derived. The relation of the shifted homotopy and differential homotopy formalisms is worked out. Projectively-compact spin-local quadratic (anti)holomorphic vertices in the one-form sector of higher-spin equations are obtained within the differential homotopy formalism.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1023 ","pages":"Article 117290"},"PeriodicalIF":2.8,"publicationDate":"2026-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145908709","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}
This work employs the gravitational decoupling scheme to study static, astrophysically compact fluid spheres within the linear functional framework of the nonmetricity-based gravity model. The motivation behind this theoretical study is twofold. On the one hand, we explore the potential effects of nonmetricity on the formation and physical characteristics of astrophysical stellar configurations exhibiting inhomogeneous matter density and pressure anisotropy. On the other hand, this work allows us to develop an effective scheme for continuously isotropizing anisotropic solutions to the equations of motion and constructing novel compact configurations with either preserved or vanishing gravitational complexity. For this purpose, we employ the minimal gravitational decoupling approach to construct closed-form stellar solutions in an astrophysical context. This strategy offers a mechanism to deform the radial metric function via a linear transformation, effectively splitting the system into two independent gravitational sources, whose individual solutions can then be combined to represent the complete configuration. Several illustrative examples are provided to demonstrate the applicability of the approach.
{"title":"Nonmetric geometry and its role in the isotropization of self-Gravitating stellar models","authors":"S. Khan , Sardor Murodov , Javlon Rayimbaev , Ikram Davletov , Inomjon Ibragimov , Sokhibjan Muminov","doi":"10.1016/j.nuclphysb.2025.117274","DOIUrl":"10.1016/j.nuclphysb.2025.117274","url":null,"abstract":"<div><div>This work employs the gravitational decoupling scheme to study static, astrophysically compact fluid spheres within the linear functional framework of the nonmetricity-based gravity model. The motivation behind this theoretical study is twofold. On the one hand, we explore the potential effects of nonmetricity on the formation and physical characteristics of astrophysical stellar configurations exhibiting inhomogeneous matter density and pressure anisotropy. On the other hand, this work allows us to develop an effective scheme for continuously isotropizing anisotropic solutions to the equations of motion and constructing novel compact configurations with either preserved or vanishing gravitational complexity. For this purpose, we employ the minimal gravitational decoupling approach to construct closed-form stellar solutions in an astrophysical context. This strategy offers a mechanism to deform the radial metric function via a linear transformation, effectively splitting the system into two independent gravitational sources, whose individual solutions can then be combined to represent the complete configuration. Several illustrative examples are provided to demonstrate the applicability of the approach.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1022 ","pages":"Article 117274"},"PeriodicalIF":2.8,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145883518","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}
Pub Date : 2026-01-01DOI: 10.1016/j.nuclphysb.2025.117280
Hikaru Kawai , Nobuyoshi Ohta
We study the quantum aspects of the conformal gravity in four dimensions, specifically addressing a known discrepancy in beta functions between general quadratic curvature theories and conformal gravity, which corresponds to two scalar degrees of freedom. We demonstrate that this mismatch is resolved by carefully introducing gauge-fixing and ghost terms via the BRST symmetry, which effectively adds the two scalar modes. Drawing lessons from two-dimensional quantum gravity and Liouville theory, we proceed to integrate the four-dimensional trace anomaly to derive a consistent Liouville action, which is given by a free-field action for the conformal mode with a consistent conformal anomaly. Finally we give the condition that the BRST transformation is anomaly free.
{"title":"Noncritical conformal gravity and four-dimensional Liouville theory","authors":"Hikaru Kawai , Nobuyoshi Ohta","doi":"10.1016/j.nuclphysb.2025.117280","DOIUrl":"10.1016/j.nuclphysb.2025.117280","url":null,"abstract":"<div><div>We study the quantum aspects of the conformal gravity in four dimensions, specifically addressing a known discrepancy in beta functions between general quadratic curvature theories and conformal gravity, which corresponds to two scalar degrees of freedom. We demonstrate that this mismatch is resolved by carefully introducing gauge-fixing and ghost terms via the BRST symmetry, which effectively adds the two scalar modes. Drawing lessons from two-dimensional quantum gravity and Liouville theory, we proceed to integrate the four-dimensional trace anomaly to derive a consistent Liouville action, which is given by a free-field action for the conformal mode with a consistent conformal anomaly. Finally we give the condition that the BRST transformation is anomaly free.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1022 ","pages":"Article 117280"},"PeriodicalIF":2.8,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145883519","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}
Pub Date : 2026-01-01DOI: 10.1016/j.nuclphysb.2025.117262
Avik De , Andronikos Paliathanasis
We study exact cosmological solutions in f(Q) gravity formulated beyond the coincident gauge, focusing on the non-coincident connection branch ΓB. Using a minisuperspace approach, the field equations are recast into an equivalent scalar-tensor form, enabling analytic reconstruction of cosmological models. We obtain exact solutions of particular interest, including de Sitter, scaling, ΛCDM, Chaplygin gas, generalized Chaplygin gas, and CPL parameterizations. The corresponding scalar potentials and f(Q) functions are derived in closed or parametric form. Our analysis shows that non-coincident f(Q) gravity admits a richer solution space than the coincident case and can describe both early-time inflationary dynamics and late-time acceleration within a unified framework. These results open new directions for testing f(Q) cosmology against observations and exploring its role as a viable alternative to ΛCDM.
{"title":"Exact cosmological solutions in vacuum non-coincidence f(Q)-theory","authors":"Avik De , Andronikos Paliathanasis","doi":"10.1016/j.nuclphysb.2025.117262","DOIUrl":"10.1016/j.nuclphysb.2025.117262","url":null,"abstract":"<div><div>We study exact cosmological solutions in <em>f</em>(<em>Q</em>) gravity formulated beyond the coincident gauge, focusing on the non-coincident connection branch Γ<sup><em>B</em></sup>. Using a minisuperspace approach, the field equations are recast into an equivalent scalar-tensor form, enabling analytic reconstruction of cosmological models. We obtain exact solutions of particular interest, including de Sitter, scaling, ΛCDM, Chaplygin gas, generalized Chaplygin gas, and CPL parameterizations. The corresponding scalar potentials and <em>f</em>(<em>Q</em>) functions are derived in closed or parametric form. Our analysis shows that non-coincident <em>f</em>(<em>Q</em>) gravity admits a richer solution space than the coincident case and can describe both early-time inflationary dynamics and late-time acceleration within a unified framework. These results open new directions for testing <em>f</em>(<em>Q</em>) cosmology against observations and exploring its role as a viable alternative to ΛCDM.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1022 ","pages":"Article 117262"},"PeriodicalIF":2.8,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145924945","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}
Pub Date : 2026-01-01DOI: 10.1016/j.nuclphysb.2025.117270
Jihong Huang , Shun Zhou
Extending the Standard Model (SM) with three right-handed neutrinos, the type-I seesaw model serves as the simplest and most natural scenario to successfully explain both tiny neutrino masses and the baryon number asymmetry in the Universe. In this paper, we perform a complete one-loop renormalization of the type-I seesaw model in the modified minimal-subtraction () scheme. The one-loop self-energy corrections of charged leptons and Majorana neutrinos are calculated in the gauge, and the explicit expressions of all the counterterms for wave functions, fermion masses and the leptonic flavor mixing matrix are given. Furthermore, adopting the Euler-like parametrization of the 6 × 6 unitary leptonic flavor mixing matrix, we derive one-loop renormalization-group equations for all the physical parameters in the scheme, including neutrino masses, mixing angles and CP-violating phases. The modification of the one-loop renormalization of the original SM parameters due to the presence of heavy Majorana neutrinos is investigated as well. In this way, we provide a self-consistent theoretical framework to thoroughly test the type-I seesaw model at the one-loop level with future precision data.
{"title":"One-loop renormalization of the type-I seesaw model in the modified minimal-subtraction scheme","authors":"Jihong Huang , Shun Zhou","doi":"10.1016/j.nuclphysb.2025.117270","DOIUrl":"10.1016/j.nuclphysb.2025.117270","url":null,"abstract":"<div><div>Extending the Standard Model (SM) with three right-handed neutrinos, the type-I seesaw model serves as the simplest and most natural scenario to successfully explain both tiny neutrino masses and the baryon number asymmetry in the Universe. In this paper, we perform a complete one-loop renormalization of the type-I seesaw model in the modified minimal-subtraction (<span><math><mover><mrow><mrow><mi>M</mi></mrow><mi>S</mi></mrow><mo>‾</mo></mover></math></span>) scheme. The one-loop self-energy corrections of charged leptons and Majorana neutrinos are calculated in the <span><math><msub><mi>R</mi><mi>ξ</mi></msub></math></span> gauge, and the explicit expressions of all the counterterms for wave functions, fermion masses and the leptonic flavor mixing matrix are given. Furthermore, adopting the Euler-like parametrization of the 6 × 6 unitary leptonic flavor mixing matrix, we derive one-loop renormalization-group equations for all the physical parameters in the <span><math><mover><mrow><mrow><mi>M</mi></mrow><mi>S</mi></mrow><mo>‾</mo></mover></math></span> scheme, including neutrino masses, mixing angles and CP-violating phases. The modification of the one-loop renormalization of the original SM parameters due to the presence of heavy Majorana neutrinos is investigated as well. In this way, we provide a self-consistent theoretical framework to thoroughly test the type-I seesaw model at the one-loop level with future precision data.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1022 ","pages":"Article 117270"},"PeriodicalIF":2.8,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145883516","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}
Pub Date : 2026-01-01DOI: 10.1016/j.nuclphysb.2025.117285
Erdem Sucu
This work investigates the influence of quantum gravity corrections and plasma effects on a magnetically charged black hole derived from Einstein-Nonlinear Electrodynamics theory. The nonlinear electromagnetic field leads to a regular geometry that removes the curvature singularity and modifies the near-horizon structure. Using the semiclassical tunnelling approach for Dirac particles, we derived the Hawking temperature and confirmed its agreement with the standard surface gravity method. Quantum effects are examined by adopting the Generalized Uncertainty Principle, which adds a minimal length scale to the theory and changes the familiar thermodynamic relations of black holes. With this correction, the temperature, entropy, and heat capacity gain small but meaningful shifts, implying that the evaporation process might stop before the mass completely vanishes. To extend the analysis, an exponential term was introduced into the entropy expression, making it possible to explore how such contributions alter quantities like internal energy, free energy, and pressure. The results suggest that these quantum terms influence the stability of the system and can lead to transitions between different thermodynamic phases depending on the magnetic charge. The Joule-Thomson process was also studied to understand how the black hole cools or heats during an isenthalpic expansion. In the last part, the deflection of light was calculated in both vacuum and plasma surroundings using the Gauss-Bonnet theorem. It was observed that magnetic charge slightly weakens the bending, while plasma enhances it due to its refractive character. Taken together, the findings show how nonlinear electrodynamics, quantum corrections, and plasma dispersion jointly affect the behavior of magnetically charged black holes, linking microscopic corrections to their observable features.
{"title":"Quantum gravity corrections and plasma-induced lensing of magnetically charged black holes","authors":"Erdem Sucu","doi":"10.1016/j.nuclphysb.2025.117285","DOIUrl":"10.1016/j.nuclphysb.2025.117285","url":null,"abstract":"<div><div>This work investigates the influence of quantum gravity corrections and plasma effects on a magnetically charged black hole derived from Einstein-Nonlinear Electrodynamics theory. The nonlinear electromagnetic field leads to a regular geometry that removes the curvature singularity and modifies the near-horizon structure. Using the semiclassical tunnelling approach for Dirac particles, we derived the Hawking temperature and confirmed its agreement with the standard surface gravity method. Quantum effects are examined by adopting the Generalized Uncertainty Principle, which adds a minimal length scale to the theory and changes the familiar thermodynamic relations of black holes. With this correction, the temperature, entropy, and heat capacity gain small but meaningful shifts, implying that the evaporation process might stop before the mass completely vanishes. To extend the analysis, an exponential term was introduced into the entropy expression, making it possible to explore how such contributions alter quantities like internal energy, free energy, and pressure. The results suggest that these quantum terms influence the stability of the system and can lead to transitions between different thermodynamic phases depending on the magnetic charge. The Joule-Thomson process was also studied to understand how the black hole cools or heats during an isenthalpic expansion. In the last part, the deflection of light was calculated in both vacuum and plasma surroundings using the Gauss-Bonnet theorem. It was observed that magnetic charge slightly weakens the bending, while plasma enhances it due to its refractive character. Taken together, the findings show how nonlinear electrodynamics, quantum corrections, and plasma dispersion jointly affect the behavior of magnetically charged black holes, linking microscopic corrections to their observable features.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1022 ","pages":"Article 117285"},"PeriodicalIF":2.8,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145924944","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}
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