Physics Letters B最新文献_第7页

Null Strings Gauged and Reloaded, I: Null Strings Have Carroll-Weyl Gauge Symmetry 空字符串测量和重新加载，1：空字符串具有卡罗尔-魏尔测量对称

IF 4.4 2区物理与天体物理

Physics Letters B Pub Date : 2026-08-03 DOI: 10.1016/j.physletb.2026.140824

M.M. Sheikh-Jabbari, H. Yavartanoo

{"title":"Null Strings Gauged and Reloaded, I: Null Strings Have Carroll-Weyl Gauge Symmetry","authors":"M.M. Sheikh-Jabbari, H. Yavartanoo","doi":"10.1016/j.physletb.2026.140824","DOIUrl":"https://doi.org/10.1016/j.physletb.2026.140824","url":null,"abstract":"Null strings, strings with Carrollian worldsheets, are traditionally described by the Isberg-Lindström-Sundborg-Theodoridis (ILST) action, which is obtained via a tensionless limit of standard tensile strings. In a recent work [1], we observed that the ILST action enjoys an overlooked partial-gauge symmetry whose existence calls into question the consistency of standard null-string analyses found in the literature. In this paper, we show that the Carrollian geometry provides us with two Weyl scaling options, in contrast to a single Weyl scaling available for the ordinary tensile string worldsheet. Defining the null string theory by the action that realizes the two Carroll-Weyl scalings as well as the 2D diffeomorphisms as local (gauge) symmetries, we construct the new null string action. We show that the ILST action is obtained after fixing one of the two Carroll-Weyl scalings of the action that we construct, and that the residual part of this symmetry is precisely the overlooked partial-gauge symmetry discussed in <ce:cross-ref ref>[1]</ce:cross-ref>. We hence clarify the Carroll-geometric origin of the overlooked symmetry and pave the way for a consistent quantization of null strings.","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"45 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2026-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148691444","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}

引用次数: 0

Dynamics of a relativistic discrete body: rigidity conditions, and covariant equations of motion 相对论离散体动力学：刚性条件和协变运动方程

IF 4.4 2区物理与天体物理

Physics Letters B Pub Date : 2026-08-01 DOI: 10.1016/j.physletb.2026.140820

Alexei A. Deriglazov

引用次数: 0

Scaling solutions of matter form factors in asymptotically safe quantum gravity 渐近安全量子引力中物质形态因子的标度解

IF 4.4 2区物理与天体物理

Physics Letters B Pub Date : 2026-07-31 DOI: 10.1016/j.physletb.2026.140814

Alfio M. Bonanno, Diego Buccio, Emiliano M. Glaviano, Frank Saueressig

{"title":"Scaling solutions of matter form factors in asymptotically safe quantum gravity","authors":"Alfio M. Bonanno, Diego Buccio, Emiliano M. Glaviano, Frank Saueressig","doi":"10.1016/j.physletb.2026.140814","DOIUrl":"https://doi.org/10.1016/j.physletb.2026.140814","url":null,"abstract":"We investigate the renormalization group flow of a gravity–matter system in which a scalar field is minimally coupled to Einstein gravity and its kinetic term is given by a scale-dependent form factor <mml:math altimg=\"si4.svg\"><mml:mrow><mml:msub><mml:mi>f</mml:mi><mml:mstyle mathvariant=\"normal\"><mml:mi>Λ</mml:mi></mml:mstyle></mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mo>−</mml:mo><mml:mo>□</mml:mo><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math>. Employing the Wilsonian proper-time flow equation, we derive a closed integro-differential equation that encodes the dependence of the form factor on the UV cutoff Λ. We solve the resulting fixed-point problem with a pseudospectral discretization and find a non-trivial fixed point for which <mml:math altimg=\"si5.svg\"><mml:mrow><mml:msub><mml:mi>f</mml:mi><mml:mo>*</mml:mo></mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mo>−</mml:mo><mml:mo>□</mml:mo><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math> departs from the canonical <mml:math altimg=\"si6.svg\"><mml:mrow><mml:mo>−</mml:mo><mml:mo>□</mml:mo></mml:mrow></mml:math> behavior. Linearizing the flow about this solution yields a discrete spectrum of perturbations and a corresponding set of critical exponents, indicating a non-trivial scaling structure in this non-local sector compatible with asymptotic safety. We also observe that the form factor becomes local once the UV cutoff is removed, suggesting that the bare action associated with this fixed point is local in the scalar two-point sector.","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"227 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2026-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148691480","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}

引用次数: 0

Kink collisions in a two-dimensional gravity model 二维重力模型中的扭结碰撞

IF 4.4 2区物理与天体物理

Physics Letters B Pub Date : 2026-07-31 DOI: 10.1016/j.physletb.2026.140815

Zhen-Tao He, Yuan Zhong

{"title":"Kink collisions in a two-dimensional gravity model","authors":"Zhen-Tao He, Yuan Zhong","doi":"10.1016/j.physletb.2026.140815","DOIUrl":"https://doi.org/10.1016/j.physletb.2026.140815","url":null,"abstract":"We numerically study kink-antikink collisions in the self-gravitating <ce:italic>ϕ</ce:italic><ce:sup loc=\"post\">4</ce:sup> model coupled to the two-dimensional dilaton gravity theory proposed by Mann et al. The static kink solutions interpolate between an anti-de Sitter (AdS<ce:inf loc=\"post\">2</ce:inf>) region and a Minkowski region, and can be regarded as two-dimensional analogues of certain thick branes. By scanning the initial velocity for several gravitational couplings, we find that gravity modifies the scattering structure: the resonance windows shift toward higher initial velocities and become progressively narrower as the coupling <ce:italic>κ</ce:italic> increases, while the critical escape velocity increases mildly. A linear perturbation analysis further indicates that the shape modes turn into long-lived quasi-bound states in the weak-gravity regime, which could leak energy during collisions and may therefore contribute to the shift and narrowing of the windows and the increase of the critical velocity. The collisions further produce a clear geometrical response: the conformal factor decreases after the collision, corresponding to a contraction of the local proper spatial scale in the conformal gauge, and this effect becomes stronger for larger <ce:italic>κ</ce:italic>. Meanwhile, the Ricci scalar develops transient peaks during kink encounters but remains finite in all simulations considered. Thus, in contrast to higher-dimensional thick-brane collisions, we find no evidence for spacetime singularity formation in this two-dimensional model.","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"28 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2026-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148691478","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}

引用次数: 0

Null strings gauged and reloaded, II: Consistent classical treatment of the null strings 测量和重新加载空字符串，II：对空字符串的一致经典处理

IF 4.4 2区物理与天体物理

Physics Letters B Pub Date : 2026-07-29 DOI: 10.1016/j.physletb.2026.140775

M.M. Sheikh-Jabbari, H. Yavartanoo

引用次数: 0

Attractive and repulsive Yang-Mills–Higgs magnetic monopoles on IR3 IR3上的吸引和排斥杨-米尔-希格斯磁单极子

IF 4.4 2区物理与天体物理

Physics Letters B Pub Date : 2026-07-25 DOI: 10.1016/j.physletb.2026.140795

Francisco Navarro-Lérida, Eugen Radu, D.H. Tchrakian

引用次数: 0

Corrigendum to “Rapid cooling of the Cassiopeia A neutron star due to superfluid quantum criticality” [Physics Letters B 879 (2026) 140591] “仙后座A中子星由于超流体量子临界的快速冷却”的勘误表[物理快报B 879 (2026) 140591]