Nuclear Physics B最新文献_第8页

Extrinsic holographic renormalization for a scalar field

IF 2.5 3区物理与天体物理

Nuclear Physics B Pub Date : 2025-01-01 DOI: 10.1016/j.nuclphysb.2024.116758

Giorgos Anastasiou , Ignacio J. Araya , Daniel Ávila , Alberto Güijosa , Sergio Patiño-López

引用次数: 0

Baryogenesis via flavoured leptogenesis in a minimal type-II seesaw model

IF 2.5 3区物理与天体物理

Nuclear Physics B Pub Date : 2025-01-01 DOI: 10.1016/j.nuclphysb.2024.116784

Sreerupa Chongdar, Sasmita Mishra

{"title":"Baryogenesis via flavoured leptogenesis in a minimal type-II seesaw model","authors":"Sreerupa Chongdar, Sasmita Mishra","doi":"10.1016/j.nuclphysb.2024.116784","DOIUrl":"10.1016/j.nuclphysb.2024.116784","url":null,"abstract":"<div><div>We study baryogenesis via leptogenesis in an extension of the Standard Model by adding one right-handed neutrino and one triplet scalar. These heavy particles contribute to the generation of tiny neutrino mass through seesaw mechanism. The contribution of the heavy particles to the neutrino masses is inversely proportional to their corresponding masses. Considering two cases of mass hierarchy between the right-handed neutrino and triplet scalar, we study baryogenesis via leptogenesis from the decay of either right-handed neutrino or the triplet scalar. The new source of charge conjugation and parity (CP) asymmetry comes from interference of tree-level diagram and one-loop vertex diagram involving the heavy particles. The predictability of the model is enhanced by obtaining a Fritzsch-type texture for the neutrino mass matrix by imposing <span><math><msub><mrow><mi>A</mi></mrow><mrow><mn>4</mn></mrow></msub><mo>×</mo><msub><mrow><mi>Z</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> symmetry. The flavour structure obtained due to the discrete flavour symmetry breaking shows special relation of the CP asymmetry parameter between flavoured and unflavoured leptogenesis. In the two-flavoured regime using the textures we show that there is an enhancement in baryon asymmetry as compared to the unflavoured regime due to the novel washout effects. We also find that the flavour effects in leptogenesis saturate the BAU in the observable range at a mass scale <span><math><mo>∼</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>10</mn></mrow></msup></math></span> GeV for triplet leptogenesis, whereas it is <span><math><mo>∼</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>11</mn></mrow></msup></math></span> GeV for the right-handed neutrino case. This feature could be attributed to the flavour structure of the model. We also study the common correlation of CP violation between low and high-energy regimes.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1010 ","pages":"Article 116784"},"PeriodicalIF":2.5,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on high-frequency quasi-periodic oscillations in black bounce-type spacetime

IF 2.5 3区物理与天体物理

Nuclear Physics B Pub Date : 2025-01-01 DOI: 10.1016/j.nuclphysb.2024.116775

Jianbo Lu, Shining Yang, Yuying Zhang, Liu Yang, Mou Xu

{"title":"Research on high-frequency quasi-periodic oscillations in black bounce-type spacetime","authors":"Jianbo Lu, Shining Yang, Yuying Zhang, Liu Yang, Mou Xu","doi":"10.1016/j.nuclphysb.2024.116775","DOIUrl":"10.1016/j.nuclphysb.2024.116775","url":null,"abstract":"<div><div>This paper investigates the high frequency quasi-periodic oscillations (HFQPOs) phenomenon around the black bounce-type (BBT) spacetime using the resonance models. We calculated the location of the innermost stable circular orbit (ISCO) for different types of celestial bodies, and derived the expression for the epicyclic frequencies of test particles. The results show that the BBT spacetime possesses unique observational characteristics, where the ordering of epicyclic frequencies varies with the regularization parameter <em>a</em>, enabling the excitation of low-order resonances and producing stronger observational signals. Using parametric and forced resonance models, we compared theoretical results with the observed 3:2 twin-peak HFQPOs in microquasars (GRO 1655-40, XTE 1550-564, GRS <span><math><mn>1915</mn><mo>+</mo><mn>105</mn></math></span>), analyzed the formation mechanisms of HFQPOs, constrained the parameters of the BBT model, and explored the possible types of celestial objects corresponding to microquasars. The study indicates that, certain parametric resonance conditions (e.g., <span><math><mi>n</mi><mo>=</mo><mn>1</mn><mo>,</mo><mn>2</mn></math></span>) lead to traversable wormhole models in BBT that closely align with observations. And forced resonance corresponding to BH or wormhole models can be verified through observations. These results deviate from the data fits of the original black-bounce model. It is found that the oscillatory behavior of three types of microquasars can also be explained by particle oscillations generated in BBT theory, providing evidence for exploring the existence of wormholes, under the assumptions of parametric resonance and forced resonance.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1010 ","pages":"Article 116775"},"PeriodicalIF":2.5,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cardy matches Bethe on the surface: A tale of a brane and a black hole

IF 2.5 3区物理与天体物理

Nuclear Physics B Pub Date : 2025-01-01 DOI: 10.1016/j.nuclphysb.2024.116773

Antonio Amariti , Pietro Glorioso , Davide Morgante , Andrea Zanetti

引用次数: 0

Charm and the standard model 魅力和标准模式

IF 2.5 3区物理与天体物理

Nuclear Physics B Pub Date : 2024-12-01 DOI: 10.1016/j.nuclphysb.2024.116730

Sheldon Lee Glashow

引用次数: 0

A chiral Λ-bms4 symmetry of AdS4 gravity AdS4引力的手性Λ-bms4对称性

IF 2.5 3区物理与天体物理

Nuclear Physics B Pub Date : 2024-11-28 DOI: 10.1016/j.nuclphysb.2024.116759

Nishant Gupta , Nemani V. Suryanarayana

{"title":"A chiral Λ-bms4 symmetry of AdS4 gravity","authors":"Nishant Gupta , Nemani V. Suryanarayana","doi":"10.1016/j.nuclphysb.2024.116759","DOIUrl":"10.1016/j.nuclphysb.2024.116759","url":null,"abstract":"<div><div>Generalising the chiral boundary conditions of <span><math><msup><mrow><mi>R</mi></mrow><mrow><mn>1</mn><mo>,</mo><mn>3</mn></mrow></msup></math></span> gravity for AdS<sub>4</sub> gravity, we derive chiral locally AdS<sub>4</sub> solutions in the Newman-Unti gauge consistent with a variational principle whose asymptotic symmetry algebra we show, to be an infinite-dimensional chiral extension of <span><math><mrow><mi>so</mi></mrow><mo>(</mo><mn>2</mn><mo>,</mo><mn>3</mn><mo>)</mo></math></span>. This symmetry algebra coincides with the chiral <span><math><msub><mrow><mi>bms</mi></mrow><mrow><mn>4</mn></mrow></msub></math></span> algebra in the flat space limit with the corresponding solutions mapping to the space of gravitational vacua in <span><math><msup><mrow><mi>R</mi></mrow><mrow><mn>1</mn><mo>,</mo><mn>3</mn></mrow></msup></math></span> gravity. We posit this symmetry algebra as the chiral version of recently discovered Λ-<span><math><msub><mrow><mi>bms</mi></mrow><mrow><mn>4</mn></mrow></msub></math></span> algebra. We propose line integral charges from the bulk AdS<sub>4</sub> gravity associated with this asymptotic symmetry algebra and show that they obey the semi-classical limit of a <span><math><mi>W</mi></math></span>-algebra. We derive this <span><math><mi>W</mi></math></span>-algebra for finite central charge <em>c</em> and level <em>κ</em> using associativity constraints of 2<em>d</em> CFT and find it to be isomorphic to one of quasi-superconformal algebra that existed in the literature.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1010 ","pages":"Article 116759"},"PeriodicalIF":2.5,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cosmic rays from annihilation of heavy dark matter particles 来自重暗物质粒子湮灭的宇宙射线

IF 2.5 3区物理与天体物理

Nuclear Physics B Pub Date : 2024-11-26 DOI: 10.1016/j.nuclphysb.2024.116754

E.V. Arbuzova , A.D. Dolgov , A.A. Nikitenko

{"title":"Cosmic rays from annihilation of heavy dark matter particles","authors":"E.V. Arbuzova , A.D. Dolgov , A.A. Nikitenko","doi":"10.1016/j.nuclphysb.2024.116754","DOIUrl":"10.1016/j.nuclphysb.2024.116754","url":null,"abstract":"<div><div>The origin of the ultra high energy cosmic rays via annihilation of heavy stable, fermions “f”, of the cosmological dark matter (DM) is studied. The particles in question are supposed to be created by the scalaron decays in <span><math><msup><mrow><mi>R</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span> modified gravity. The novel part of our approach is the assumption that the mass of these carriers of DM is slightly below than a half of the scalaron mass. In such a case the phase space volume becomes tiny. It leads to sufficiently low probability of “f” production, so their average cosmological energy density could be equal to the observed energy density of dark matter. Several regions of the universe, where the annihilation could take place, are studied. They include the whole universe under the assumption of homogeneous energy density, the high density DM clump in the galactic center, the cloud of DM in the Galaxy with realistic density distribution, and high density clumps of DM in the Galaxy. Possible resonance annihilation of <span><math><mi>f</mi><mover><mrow><mi>f</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> into energetic light particles is considered. We have shown that the proposed scenario can successfully explain the origin of the ultrahigh energy flux of cosmic rays where canonical astrophysical mechanisms are not operative.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1010 ","pages":"Article 116754"},"PeriodicalIF":2.5,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Complexity of quantum-mechanical evolutions from probability amplitudes 从概率振幅看量子力学演化的复杂性

IF 2.5 3区物理与天体物理

Nuclear Physics B Pub Date : 2024-11-26 DOI: 10.1016/j.nuclphysb.2024.116755

Carlo Cafaro , Leonardo Rossetti , Paul M. Alsing

{"title":"Complexity of quantum-mechanical evolutions from probability amplitudes","authors":"Carlo Cafaro , Leonardo Rossetti , Paul M. Alsing","doi":"10.1016/j.nuclphysb.2024.116755","DOIUrl":"10.1016/j.nuclphysb.2024.116755","url":null,"abstract":"<div><div>We study the complexity of both time-optimal and time sub-optimal quantum Hamiltonian evolutions connecting arbitrary source and a target states on the Bloch sphere equipped with the Fubini-Study metric. This investigation is performed in a number of steps. First, we describe each unitary Schrödinger quantum evolution by means of the path length, the geodesic efficiency, the speed efficiency, and the curvature coefficient of its corresponding dynamical trajectory linking the source state to the target state. Second, starting from a classical probabilistic setting where the so-called information geometric complexity can be employed to describe the complexity of entropic motion on curved statistical manifolds underlying the physics of systems when only partial knowledge about them is available, we transition into a deterministic quantum setting. In this context, after proposing a definition of the complexity of a quantum evolution, we present a notion of quantum complexity length scale. In particular, we discuss the physical significance of both quantities in terms of the accessed (i.e., partial) and accessible (i.e., total) parametric volumes of the regions on the Bloch sphere that specify the quantum mechanical evolution from the source to the target states. Third, after calculating the complexity measure and the complexity length scale for each one of the two quantum evolutions, we compare the behavior of our measures with that of the path length, the geodesic efficiency, the speed efficiency, and the curvature coefficient. We find that, in general, efficient quantum evolutions are less complex than inefficient evolutions. However, we also observe that complexity is more than length. Indeed, longer paths that are sufficiently bent can exhibit a behavior that is less complex than that of shorter paths with a smaller curvature coefficient.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1010 ","pages":"Article 116755"},"PeriodicalIF":2.5,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On causality and its violation in f(R,Lm,T) gravity 论 f（R，Lm，T）引力中的因果关系及其违反情况

IF 2.5 3区物理与天体物理

Nuclear Physics B Pub Date : 2024-11-22 DOI: 10.1016/j.nuclphysb.2024.116751

J.S. Gonçalves, A.F. Santos

{"title":"On causality and its violation in f(R,Lm,T) gravity","authors":"J.S. Gonçalves, A.F. Santos","doi":"10.1016/j.nuclphysb.2024.116751","DOIUrl":"10.1016/j.nuclphysb.2024.116751","url":null,"abstract":"<div><div>In this paper, <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>,</mo><mi>T</mi><mo>)</mo></math></span> gravity is considered. It is a generalization of the theories <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><mi>T</mi><mo>)</mo></math></span> and <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>)</mo></math></span>. This modified theory of gravity exhibits strong geometry-matter coupling. The problem of causality and its violation is verified in this model. Such analysis is carried out using Gödel-type solutions considering different types of matter. It is shown that this model allows both causal and non-causal solutions. These solutions depend directly on the content of matter present in the universe. For the non-causal solution, a critical radius is calculated, beyond which causality is violated. Taking different matter contents, an infinite critical radius emerges that leads to a causal solution. To obtain a causal solution, a natural relationship arises between the parameters of the theory.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1010 ","pages":"Article 116751"},"PeriodicalIF":2.5,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Barotropic equations of state in 4D Einstein-Maxwell-Gauss-Bonnet stellar distributions 四维爱因斯坦-麦克斯韦-高斯-波内特恒星分布中的气压状态方程

IF 2.5 3区物理与天体物理

Nuclear Physics B Pub Date : 2024-11-22 DOI: 10.1016/j.nuclphysb.2024.116753

Sudan Hansraj, Siyamthanda Remember Mngadi, Abdelghani Errehymy

{"title":"Barotropic equations of state in 4D Einstein-Maxwell-Gauss-Bonnet stellar distributions","authors":"Sudan Hansraj, Siyamthanda Remember Mngadi, Abdelghani Errehymy","doi":"10.1016/j.nuclphysb.2024.116753","DOIUrl":"10.1016/j.nuclphysb.2024.116753","url":null,"abstract":"<div><div>We investigate the role of a linear barotropic equation of state (<span><math><mi>p</mi><mo>=</mo><mi>γ</mi><mi>ρ</mi></math></span>) on the structure of charged stars under higher curvature effects induced by the Gauss-Bonnet invariants in 4 dimensions. Assuming a constant spatially directed potential which gives isothermal behavior in the standard theory, the master equation is solved in terms of hypergeometric functions but a viable model could not be constructed. Setting the temporal potential to a constant, comparable to the defective Einstein static universe, interestingly admits nontrivial nonconstant exact solutions due to the higher curvature terms unlike in general relativity. Next the existence of a one-parameter group of conformal motions in the spacetime geometry was investigated. The master differential equation is solvable exactly in implicit form and explicit solutions are found for special cases. For the case of a stiff fluid <span><math><mi>p</mi><mo>=</mo><mi>ρ</mi></math></span> a stellar model with pleasing physical attributes is found. When the potential is assumed to vary linearly with the radius, an exact incoherent radiation model <span><math><mi>p</mi><mo>=</mo><mfrac><mrow><mn>1</mn></mrow><mrow><mn>3</mn></mrow></mfrac><mi>ρ</mi></math></span> emerges. The physical properties of both these solutions are analyzed comprehensively with the aid of graphical plots in conjunction with suitably defined parameter spaces. It was found that both exact models passed elementary astrophysical tests for physical plausibility.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1010 ","pages":"Article 116753"},"PeriodicalIF":2.5,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0