Pub Date : 2025-03-03DOI: 10.1103/physrevd.111.066001
Ginestra Bianconi
Gravity is derived from an entropic action coupling matter fields with geometry. The fundamental idea is to relate the metric of Lorentzian spacetime to a quantum operator, playing the role of an and to describe the matter fields topologically, according to a Dirac-Kähler formalism, as the direct sum of a 0-form, a 1-form and a 2-form. While the geometry of spacetime is defined by its metric, the matter fields can be used to define an alternative metric, the metric induced by the matter fields, which geometrically describes the interplay between spacetime and matter. The proposed entropic action is the quantum relative entropy between the metric of spacetime and the metric induced by the matter fields. The modified Einstein equations obtained from this action reduce to the Einstein equations with zero cosmological constant in the regime of low coupling. By introducing the , which acts as a set of Lagrangian multipliers, the proposed entropic action reduces to a dressed Einstein-Hilbert action with an emergent small and positive cosmological constant only dependent on the G-field. The obtained equations of modified gravity remain second order in the metric and in the G-field. A canonical quantization of this field theory could bring new insights into quantum gravity while further research might clarify the role that the G-field could have for dark matter. Published by the American Physical Society2025
{"title":"Gravity from entropy","authors":"Ginestra Bianconi","doi":"10.1103/physrevd.111.066001","DOIUrl":"https://doi.org/10.1103/physrevd.111.066001","url":null,"abstract":"Gravity is derived from an entropic action coupling matter fields with geometry. The fundamental idea is to relate the metric of Lorentzian spacetime to a quantum operator, playing the role of an and to describe the matter fields topologically, according to a Dirac-Kähler formalism, as the direct sum of a 0-form, a 1-form and a 2-form. While the geometry of spacetime is defined by its metric, the matter fields can be used to define an alternative metric, the metric induced by the matter fields, which geometrically describes the interplay between spacetime and matter. The proposed entropic action is the quantum relative entropy between the metric of spacetime and the metric induced by the matter fields. The modified Einstein equations obtained from this action reduce to the Einstein equations with zero cosmological constant in the regime of low coupling. By introducing the , which acts as a set of Lagrangian multipliers, the proposed entropic action reduces to a dressed Einstein-Hilbert action with an emergent small and positive cosmological constant only dependent on the G-field. The obtained equations of modified gravity remain second order in the metric and in the G-field. A canonical quantization of this field theory could bring new insights into quantum gravity while further research might clarify the role that the G-field could have for dark matter. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"22 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143538669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2025-03-03DOI: 10.1103/physrevd.111.l061901
Frank Ferrari
We propose a microscopic definition of finite cutoff JT quantum gravity on the disk, both in the discretized and in the continuum points of view. The discretized formulation involves a new model of so-called self-overlapping random polygons. The measure is not uniform, implying that the degrees of freedom are not in one-to-one correspondence with the shape of the boundary. The continuum formulation is based on a boundary CFT1 from which we predict some critical exponents of the self-overlapping polygon model. The coupling to an arbitrary bulk matter CFT is also discussed. Published by the American Physical Society2025
我们从离散和连续的角度提出了盘面上有限截止 JT 量子引力的微观定义。离散表述涉及所谓自重叠随机多边形的新模型。这种度量不是均匀的，这意味着自由度与边界形状不是一一对应的。连续体公式基于边界 CFT1，我们从中预测了自重叠多边形模型的一些临界指数。我们还讨论了与任意体物质 CFT 的耦合。 美国物理学会出版 2025
{"title":"Jackiw-Teitelboim gravity, random disks of constant curvature, self-overlapping curves, and Liouville CFT1","authors":"Frank Ferrari","doi":"10.1103/physrevd.111.l061901","DOIUrl":"https://doi.org/10.1103/physrevd.111.l061901","url":null,"abstract":"We propose a microscopic definition of finite cutoff JT quantum gravity on the disk, both in the discretized and in the continuum points of view. The discretized formulation involves a new model of so-called self-overlapping random polygons. The measure is not uniform, implying that the degrees of freedom are not in one-to-one correspondence with the shape of the boundary. The continuum formulation is based on a boundary CFT</a:mi>1</a:mn></a:msub></a:math> from which we predict some critical exponents of the self-overlapping polygon model. The coupling to an arbitrary bulk matter CFT is also discussed. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"52 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143538513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
The role of asymmetric nuclear medium on the properties of kaon is investigated at zero and finite temperature employing a hybrid approach integrating the light cone quark model and the chiral SU(3) quark mean field model. The in-medium quark masses are calculated within the chiral SU(3) quark mean field model and are used as inputs to study the medium modifications in the kaon properties. In particular, we have analyzed the impact of baryonic density, isospin asymmetry, and temperature on the weak decay constant, distribution amplitudes, and parton distribution functions (PDFs) of valence quarks of kaon. The effects of isospin asymmetry on the kaon doublet K=(K+K0) and antikaon doublet K¯=(K−,K¯0) are also studied. In order to compare with future experiments, we have also evolved the in-medium PDFs of kaons to Q2=16GeV2. As compared to the temperature and isospin asymmetry, change in baryonic density of the nuclear medium makes more significant changes to the distribution amplitudes and PDFs of kaons. Published by the American Physical Society2025
{"title":"Effect of an asymmetric nuclear medium on the valence quark structure of the kaons","authors":"Dhananjay Singh, Satyajit Puhan, Navpreet Kaur, Manpreet Kaur, Arvind Kumar, Suneel Dutt, Harleen Dahiya","doi":"10.1103/physrevd.111.054001","DOIUrl":"https://doi.org/10.1103/physrevd.111.054001","url":null,"abstract":"The role of asymmetric nuclear medium on the properties of kaon is investigated at zero and finite temperature employing a hybrid approach integrating the light cone quark model and the chiral SU(3) quark mean field model. The in-medium quark masses are calculated within the chiral SU(3) quark mean field model and are used as inputs to study the medium modifications in the kaon properties. In particular, we have analyzed the impact of baryonic density, isospin asymmetry, and temperature on the weak decay constant, distribution amplitudes, and parton distribution functions (PDFs) of valence quarks of kaon. The effects of isospin asymmetry on the kaon doublet K</a:mi>=</a:mo>(</a:mo>K</a:mi></a:mrow>+</a:mo></a:mrow></a:msup></a:mrow>K</a:mi></a:mrow>0</a:mn></a:mrow></a:msup></a:mrow></a:mfrac>)</a:mo></a:mrow></a:mrow></a:math> and antikaon doublet <f:math xmlns:f=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><f:mrow><f:mover accent=\"true\"><f:mrow><f:mi>K</f:mi></f:mrow><f:mrow><f:mo stretchy=\"false\">¯</f:mo></f:mrow></f:mover><f:mo>=</f:mo><f:mo stretchy=\"false\">(</f:mo><f:msup><f:mrow><f:mi>K</f:mi></f:mrow><f:mrow><f:mo>−</f:mo></f:mrow></f:msup><f:mo>,</f:mo><f:msup><f:mrow><f:mover accent=\"true\"><f:mrow><f:mi>K</f:mi></f:mrow><f:mrow><f:mo stretchy=\"false\">¯</f:mo></f:mrow></f:mover></f:mrow><f:mrow><f:mn>0</f:mn></f:mrow></f:msup><f:mo stretchy=\"false\">)</f:mo></f:mrow></f:math> are also studied. In order to compare with future experiments, we have also evolved the in-medium PDFs of kaons to <n:math xmlns:n=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><n:msup><n:mi>Q</n:mi><n:mn>2</n:mn></n:msup><n:mo>=</n:mo><n:mn>16</n:mn><n:mtext> </n:mtext><n:mtext> </n:mtext><n:msup><n:mrow><n:mi>GeV</n:mi></n:mrow><n:mrow><n:mn>2</n:mn></n:mrow></n:msup></n:math>. As compared to the temperature and isospin asymmetry, change in baryonic density of the nuclear medium makes more significant changes to the distribution amplitudes and PDFs of kaons. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"52 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143538421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2025-03-03DOI: 10.1103/physrevd.111.063006
Kevin Federico, Stefano Profumo
The final stage of black hole evaporation is a potent probe of physics beyond the Standard Model: Hawking-Bekenstein radiation may be affected by quantum gravity “memory burden effects,” or by the presence of “dark,” beyond-the-Standard-Model degrees of freedom in ways that are testable with high-energy gamma-ray observations. We argue that information on either scenario can best be inferred from measurements of the evaporation’s light curve and by correlating observations at complementary energies. We offer several new analytical insights in how such observations map on the fundamental properties of the evaporating black holes and of the possible exotic particles they can evaporate into. Published by the American Physical Society2025
{"title":"Black hole explosions as probes of new physics","authors":"Kevin Federico, Stefano Profumo","doi":"10.1103/physrevd.111.063006","DOIUrl":"https://doi.org/10.1103/physrevd.111.063006","url":null,"abstract":"The final stage of black hole evaporation is a potent probe of physics beyond the Standard Model: Hawking-Bekenstein radiation may be affected by quantum gravity “memory burden effects,” or by the presence of “dark,” beyond-the-Standard-Model degrees of freedom in ways that are testable with high-energy gamma-ray observations. We argue that information on either scenario can best be inferred from measurements of the evaporation’s light curve and by correlating observations at complementary energies. We offer several new analytical insights in how such observations map on the fundamental properties of the evaporating black holes and of the possible exotic particles they can evaporate into. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"17 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143538511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2025-03-03DOI: 10.1103/physrevd.111.065002
Roberto Bonezzi, Christoph Chiaffrino, Olaf Hohm
The kinematic algebra of Yang-Mills theory can be understood in the framework of homotopy algebras: the L∞ algebra of Yang-Mills theory is the tensor product of the color Lie algebra and a kinematic space that carries a C∞ algebra. There are also hidden structures that generalize Batalin-Vilkovisky algebras, which explain color-kinematics duality and the double copy but are only partially understood. We show that there is a representation of the C∞ algebra, in terms of vertex operators, on the Hilbert space of a first-quantized worldline theory. To this end we introduce A∞ morphisms, which define the vertex operators and which inject the C∞ algebra into the strictly associative algebra of operators on the Hilbert space. We also take the first steps to represent the hidden structures on the same space. Published by the American Physical Society2025
{"title":"Vertex operators for the kinematic algebra of Yang-Mills theory","authors":"Roberto Bonezzi, Christoph Chiaffrino, Olaf Hohm","doi":"10.1103/physrevd.111.065002","DOIUrl":"https://doi.org/10.1103/physrevd.111.065002","url":null,"abstract":"The kinematic algebra of Yang-Mills theory can be understood in the framework of homotopy algebras: the L</a:mi>∞</a:mi></a:msub></a:math> algebra of Yang-Mills theory is the tensor product of the color Lie algebra and a kinematic space that carries a <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><c:msub><c:mi>C</c:mi><c:mi>∞</c:mi></c:msub></c:math> algebra. There are also hidden structures that generalize Batalin-Vilkovisky algebras, which explain color-kinematics duality and the double copy but are only partially understood. We show that there is a representation of the <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><e:msub><e:mi>C</e:mi><e:mi>∞</e:mi></e:msub></e:math> algebra, in terms of vertex operators, on the Hilbert space of a first-quantized worldline theory. To this end we introduce <g:math xmlns:g=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><g:msub><g:mi>A</g:mi><g:mi>∞</g:mi></g:msub></g:math> morphisms, which define the vertex operators and which inject the <i:math xmlns:i=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><i:msub><i:mi>C</i:mi><i:mi>∞</i:mi></i:msub></i:math> algebra into the strictly associative algebra of operators on the Hilbert space. We also take the first steps to represent the hidden structures on the same space. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"32 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143538674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 investigate the thermodynamics of Reissner-Nordström Gauss-Bonnet (RN-GB) black holes in anti–de Sitter (AdS) space with three horizon geometries (k=+1,0,−1) within the grand canonical ensemble. Using the recently developed topological approach to black hole thermodynamics, inspired by Duan’s ϕ-mapping theory, we analyze the black holes by treating both critical points in the phase diagram and black hole solutions as defects in the thermodynamic parameter space. Our results show that the Gauss-Bonnet coupling significantly alters the topological classification of RN-GB AdS black holes, distinguishing them from their RN AdS counterparts in the grand canonical ensemble while aligning with their canonical ensemble counterparts. Complementary analyses of local stability using specific heat validate the implication of topological analysis. Furthermore, an evaluation of global stability via Gibbs free energy provides a comprehensive understanding on system phase structure. Notably, for k=+1, topological analysis suggests liquid-gas-type phase transitions, whereas global analysis favors Hawking-Page transitions. For k=−1, topology indicates a single stable black hole branch, yet the global analysis reveals the presence of Hawking-Page transitions. Published by the American Physical Society2025
{"title":"Stability and topological nature of charged Gauss-Bonnet AdS black holes in five dimensions","authors":"Imtak Jeon, Bum-Hoon Lee, Wonwoo Lee, Madhu Mishra","doi":"10.1103/physrevd.111.064006","DOIUrl":"https://doi.org/10.1103/physrevd.111.064006","url":null,"abstract":"We investigate the thermodynamics of Reissner-Nordström Gauss-Bonnet (RN-GB) black holes in anti–de Sitter (AdS) space with three horizon geometries (k</a:mi>=</a:mo>+</a:mo>1</a:mn>,</a:mo>0</a:mn>,</a:mo>−</a:mo>1</a:mn></a:math>) within the grand canonical ensemble. Using the recently developed topological approach to black hole thermodynamics, inspired by Duan’s <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><c:mi>ϕ</c:mi></c:math>-mapping theory, we analyze the black holes by treating both critical points in the phase diagram and black hole solutions as defects in the thermodynamic parameter space. Our results show that the Gauss-Bonnet coupling significantly alters the topological classification of RN-GB AdS black holes, distinguishing them from their RN AdS counterparts in the grand canonical ensemble while aligning with their canonical ensemble counterparts. Complementary analyses of local stability using specific heat validate the implication of topological analysis. Furthermore, an evaluation of global stability via Gibbs free energy provides a comprehensive understanding on system phase structure. Notably, for <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><e:mi>k</e:mi><e:mo>=</e:mo><e:mo>+</e:mo><e:mn>1</e:mn></e:math>, topological analysis suggests liquid-gas-type phase transitions, whereas global analysis favors Hawking-Page transitions. For <g:math xmlns:g=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><g:mi>k</g:mi><g:mo>=</g:mo><g:mo>−</g:mo><g:mn>1</g:mn></g:math>, topology indicates a single stable black hole branch, yet the global analysis reveals the presence of Hawking-Page transitions. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"9 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143538461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2025-03-03DOI: 10.1103/physrevd.111.065007
Li-Juan Li, Xue-Ke Song, Liu Ye, Dong Wang
Probing quantumness in curved spacetime is regarded as one of the fundamental and important topics in the framework of relativistic quantum information. In this work, we focus on the theoretical feasibility of probing quantum properties in de Sitter (dS) and anti–de Sitter (AdS) spacetimes via detectors. By employing the Unruh-DeWitt detector coupled with a massless scalar field, which is treated as an open system, quantum uncertainty and quantum coherence in both dS and AdS spacetimes are investigated. Our analysis reveals that the acceleration in dS spacetime and the boundary conditions in AdS spacetime significantly impact the detector’s evolution in the initial stage. Notably, both of the uncertainty and coherence will oscillate with the initial state being in a superposition state, however the high temperature is able to suppress their oscillation. Interestingly, it is found that the constant values of the final uncertainty and coherence are identical as those in dS and AdS spacetimes, which are determined by the ratio of energy gap to temperature. Hence, the current exploration offers insight into quantumness in dS and AdS spacetimes, and might be helpful to facilitate the curved-spacetime-based quantum information processing. Published by the American Physical Society2025
{"title":"Quantifying quantumness in (A)dS spacetimes with Unruh-DeWitt detector","authors":"Li-Juan Li, Xue-Ke Song, Liu Ye, Dong Wang","doi":"10.1103/physrevd.111.065007","DOIUrl":"https://doi.org/10.1103/physrevd.111.065007","url":null,"abstract":"Probing quantumness in curved spacetime is regarded as one of the fundamental and important topics in the framework of relativistic quantum information. In this work, we focus on the theoretical feasibility of probing quantum properties in de Sitter (dS) and anti–de Sitter (AdS) spacetimes via detectors. By employing the Unruh-DeWitt detector coupled with a massless scalar field, which is treated as an open system, quantum uncertainty and quantum coherence in both dS and AdS spacetimes are investigated. Our analysis reveals that the acceleration in dS spacetime and the boundary conditions in AdS spacetime significantly impact the detector’s evolution in the initial stage. Notably, both of the uncertainty and coherence will oscillate with the initial state being in a superposition state, however the high temperature is able to suppress their oscillation. Interestingly, it is found that the constant values of the final uncertainty and coherence are identical as those in dS and AdS spacetimes, which are determined by the ratio of energy gap to temperature. Hence, the current exploration offers insight into quantumness in dS and AdS spacetimes, and might be helpful to facilitate the curved-spacetime-based quantum information processing. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"17 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143538666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2025-03-03DOI: 10.1103/physrevd.111.063007
Melissa Mendes, Jan-Erik Christian, Farrukh J. Fattoyev, Jürgen Schaffner-Bielich
We investigate the influence of a phase transition from hadronic matter to a deconfined quark phase inside a neutron star on its cooling behavior including the appearance of twin star solutions in the mass-radius diagram. We find that while the inferred neutrino luminosity of cold transiently accreting star in MXB 1659-29 is reproduced in all of the constructed twin star models, the luminosity of a colder source, the neutron star in SAX J1808.4-3658, cannot be described by equations of state with quark-hadron transition densities below 1.7 saturation density, suggesting that twin stars with such low density transitions to the quark phase are not realized in nature. We also discuss how constraints to the quark-hadron phase transition density are strongly dependent on the cooling effectiveness of neutrino reactions in the quark phase. Published by the American Physical Society2025
{"title":"Constraining twin stars with cold neutron star cooling data","authors":"Melissa Mendes, Jan-Erik Christian, Farrukh J. Fattoyev, Jürgen Schaffner-Bielich","doi":"10.1103/physrevd.111.063007","DOIUrl":"https://doi.org/10.1103/physrevd.111.063007","url":null,"abstract":"We investigate the influence of a phase transition from hadronic matter to a deconfined quark phase inside a neutron star on its cooling behavior including the appearance of twin star solutions in the mass-radius diagram. We find that while the inferred neutrino luminosity of cold transiently accreting star in MXB 1659-29 is reproduced in all of the constructed twin star models, the luminosity of a colder source, the neutron star in SAX J1808.4-3658, cannot be described by equations of state with quark-hadron transition densities below 1.7 saturation density, suggesting that twin stars with such low density transitions to the quark phase are not realized in nature. We also discuss how constraints to the quark-hadron phase transition density are strongly dependent on the cooling effectiveness of neutrino reactions in the quark phase. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"211 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143538668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2025-03-03DOI: 10.1103/physrevd.111.065001
Daniel Herrera Correa, Cristhiam Lopez-Arcos, Alexander Quintero Vélez
By employing the perturbiner method, we study the tree- and one-loop-level amplitudes in (anti)self-dual Yang-Mills, focusing on color-kinematics duality and double copy features; they arise naturally even in the fully off-shell case. In particular, we calculate the respective the Kawai-Lewellen-Tye relations for tree-level Berends-Giele currents and color-kinematics master numerators at one loop, both cases for any number of external particles. Published by the American Physical Society2025
{"title":"Tree- and one-loop-level double copy for the (anti)self-dual sectors of Yang-Mills and gravity theories","authors":"Daniel Herrera Correa, Cristhiam Lopez-Arcos, Alexander Quintero Vélez","doi":"10.1103/physrevd.111.065001","DOIUrl":"https://doi.org/10.1103/physrevd.111.065001","url":null,"abstract":"By employing the perturbiner method, we study the tree- and one-loop-level amplitudes in (anti)self-dual Yang-Mills, focusing on color-kinematics duality and double copy features; they arise naturally even in the fully off-shell case. In particular, we calculate the respective the Kawai-Lewellen-Tye relations for tree-level Berends-Giele currents and color-kinematics master numerators at one loop, both cases for any number of external particles. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"6 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143538485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 propose a new realization of light Dirac neutrino mass and dark matter (DM) within the framework of a non-Abelian discrete flavor symmetry based on A4 group. In addition to A4, we also consider a Z2 and an unbroken global lepton number symmetry U(1)L to keep unwanted terms away while guaranteeing the Dirac nature of light neutrinos. The field content, their transformations, and flavon vacuum alignments are chosen in such a way that the type-I Dirac seesaw generates only one light Dirac neutrino mass while the other two masses arise from scotogenic contributions at one-loop. This leads to the Dirac scoto-seesaw framework, a generalization of the widely studied scoto-seesaw model to Dirac neutrinos. The symmetry breaking of A4 leaves a remnant Z2 symmetry responsible for stabilizing DM. Dirac nature of light neutrinos introduces additional relativistic degrees of freedom ΔNeff within reach of cosmic microwave background experiments. Published by the American Physical Society2025
{"title":"Discrete dark matter with light Dirac neutrinos","authors":"Debasish Borah, Pritam Das, Biswajit Karmakar, Satyabrata Mahapatra","doi":"10.1103/physrevd.111.035032","DOIUrl":"https://doi.org/10.1103/physrevd.111.035032","url":null,"abstract":"We propose a new realization of light Dirac neutrino mass and dark matter (DM) within the framework of a non-Abelian discrete flavor symmetry based on A</a:mi>4</a:mn></a:msub></a:math> group. In addition to <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><c:msub><c:mi>A</c:mi><c:mn>4</c:mn></c:msub></c:math>, we also consider a <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><e:msub><e:mi>Z</e:mi><e:mn>2</e:mn></e:msub></e:math> and an unbroken global lepton number symmetry <g:math xmlns:g=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><g:mi>U</g:mi><g:mo stretchy=\"false\">(</g:mo><g:mn>1</g:mn><g:msub><g:mo stretchy=\"false\">)</g:mo><g:mi>L</g:mi></g:msub></g:math> to keep unwanted terms away while guaranteeing the Dirac nature of light neutrinos. The field content, their transformations, and flavon vacuum alignments are chosen in such a way that the type-I Dirac seesaw generates only one light Dirac neutrino mass while the other two masses arise from scotogenic contributions at one-loop. This leads to the Dirac scoto-seesaw framework, a generalization of the widely studied scoto-seesaw model to Dirac neutrinos. The symmetry breaking of <k:math xmlns:k=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><k:msub><k:mi>A</k:mi><k:mn>4</k:mn></k:msub></k:math> leaves a remnant <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><m:msub><m:mi mathvariant=\"script\">Z</m:mi><m:mn>2</m:mn></m:msub></m:math> symmetry responsible for stabilizing DM. Dirac nature of light neutrinos introduces additional relativistic degrees of freedom <p:math xmlns:p=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><p:mi mathvariant=\"normal\">Δ</p:mi><p:msub><p:mi>N</p:mi><p:mi>eff</p:mi></p:msub></p:math> within reach of cosmic microwave background experiments. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"35 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143526460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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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