Journal of High Energy Physics最新文献_第2页

Spectral projections for density matrices in quantum field theories

IF 5.4 1区物理与天体物理

Journal of High Energy Physics Pub Date : 2025-04-02 DOI: 10.1007/JHEP04(2025)033

Wu-zhong Guo

{"title":"Spectral projections for density matrices in quantum field theories","authors":"Wu-zhong Guo","doi":"10.1007/JHEP04(2025)033","DOIUrl":"10.1007/JHEP04(2025)033","url":null,"abstract":"In this paper, we investigate the spectral projection of density matrices in quantum field theory. With appropriate regularization, the spectral projectors of density matrices are expected to be well-defined. These projectors can be obtained using the Riesz projection formula, which allows us to compute both the density of eigenvalues and the expectation values of local operators in the projected states. We find that there are universal divergent terms in the expectation value of the stress energy tensor, where the coefficients depend universally on the density of eigenvalues and a function that describes the dependence of eigenvalues on boundary location. Using projection states, we can construct a series of new states in quantum field theories and discuss their general properties, focusing on the holographic aspects. We observe that quantum fluctuations are suppressed in the semiclassical limit. We also demonstrate that the fixed area state, previously constructed using gravitational path integrals, can be constructed by suitably superposition of appromiate amount of projection states. Additionally, we apply spectral projection to non-Hermitian operators, such as transition matrices, to obtain their eigenvalues and densities. Finally, we highlight potential applications of spectral projections, including the construction of new density and transition matrices and the understanding of superpositions of geometric states.","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 4","pages":""},"PeriodicalIF":5.4,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP04(2025)033.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Closed string amplitudes around tachyon vacuum solution in Kaku theory

IF 5.4 1区物理与天体物理

Journal of High Energy Physics Pub Date : 2025-04-02 DOI: 10.1007/JHEP04(2025)029

Yuji Ando

引用次数: 0

A new approach to superstring

IF 5.4 1区物理与天体物理

Journal of High Energy Physics Pub Date : 2025-04-02 DOI: 10.1007/JHEP04(2025)021

A. Schwarz

引用次数: 0

Variational Loop Vertex Expansion

IF 5.4 1区物理与天体物理

Journal of High Energy Physics Pub Date : 2025-04-02 DOI: 10.1007/JHEP04(2025)032

Vasily Sazonov

引用次数: 0

Adiabatic Hydrodynamization and the emergence of attractors: a unified description of hydrodynamization in kinetic theory

IF 5.4 1区物理与天体物理

Journal of High Energy Physics Pub Date : 2025-04-02 DOI: 10.1007/JHEP04(2025)028

Krishna Rajagopal, Bruno Scheihing-Hitschfeld, Rachel Steinhorst

{"title":"Adiabatic Hydrodynamization and the emergence of attractors: a unified description of hydrodynamization in kinetic theory","authors":"Krishna Rajagopal, Bruno Scheihing-Hitschfeld, Rachel Steinhorst","doi":"10.1007/JHEP04(2025)028","DOIUrl":"10.1007/JHEP04(2025)028","url":null,"abstract":"“Attractor” solutions for the pre-hydrodynamic, far-from-equilibrium, evolution of the matter produced in relativistic heavy ion collisions have emerged as crucial descriptors of the rapid hydrodynamization of quark-gluon plasma (QGP). Adiabatic Hydrodynamization (AH) has been proposed as a framework with which to describe, explain, and predict attractor behavior that draws upon an analogy to the adiabatic approximation in quantum mechanics. In this work, we systematize the description of pre-hydrodynamic attractors in kinetic theory by showing how to use the AH framework to identify these long-lived solutions to which varied initial conditions rapidly evolve, demonstrating the robustness of this framework. In a simplified QCD kinetic theory in the small-angle scattering limit, we use AH to explain both the early- and late-time scaling behavior of a longitudinally expanding gluon gas in a unified framework. In this context, we show that AH provides a unified description of, and intuition for, all the stages of what in QCD would be bottom-up thermalization, starting from a pre-hydrodynamic attractor and ending with hydrodynamization. We additionally discuss the connection between the notions of scaling behavior and adiabaticity and the crucial role of time-dependent coordinate redefinitions in identifying the degrees of freedom of kinetic theories that give rise to attractor solutions. The tools we present open a path to the intuitive explanation of how attractor behavior arises and how the attractor evolves in all stages of the hydrodynamization of QGP in heavy ion collisions.","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 4","pages":""},"PeriodicalIF":5.4,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP04(2025)028.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Unveiling the invisible: ALPs and sterile neutrinos at the LHC and HL-LHC

IF 5.4 1区物理与天体物理

Journal of High Energy Physics Pub Date : 2025-04-02 DOI: 10.1007/JHEP04(2025)024

Kingman Cheung, C. J. Ouseph, Sin Kyu Kang

{"title":"Unveiling the invisible: ALPs and sterile neutrinos at the LHC and HL-LHC","authors":"Kingman Cheung, C. J. Ouseph, Sin Kyu Kang","doi":"10.1007/JHEP04(2025)024","DOIUrl":"10.1007/JHEP04(2025)024","url":null,"abstract":"We investigate the potential of using the signature of mono-Higgs plus large missing energies to constrain on two new ph\tysics models, namely the model of an axion-like particle (ALP) and the model of sterile neutrinos. We focus on the Higgs-ALP interactions starting at dimension-six and the Higgs-sterile neutrino interactions starting at dimension-five, via the processes pp → haa for ALP production and pp → hNN for sterile neutrinos at the LHC and High Luminosity LHC (HL-LHC), followed by the Higgs decay ( hto boverline{b} ). We establish bounds on the ALP-Higgs coupling ( frac{C_{aH}}{Lambda^2} ) and sterile neutrino-Higgs coupling ( frac{lambda_3}{M_{ast }} ), respectively, for ALP and sterile-neutrino mass ranging from 1 to 60 GeV, using the recent ATLAS data on mono-Higgs plus missing energies at the LHC (( sqrt{s} ) = 13 TeV and ( mathcal{L} ) = 139 fb−1). The most stringent constraint occurs in the missing transverse energy MET range 200 < MET ≤ 350 GeV. We also estimate the sensitivities that we can achieve at the HL-LHC (( sqrt{s} ) = 14 TeV and ( mathcal{L} ) = 3000 fb−1). We obtain improved sensitivities across various missing energy regions. The ALP model exhibits better sensitivities, particularly at lower mass range, compared to the sterile neutrino model, which shows weaker sensitivities across similar mass and energy ranges. Our results underscore the potential of the mono-Higgs signature as a robust probe for physics beyond the Standard Model.","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 4","pages":""},"PeriodicalIF":5.4,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP04(2025)024.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Positivity properties of five-point two-loop Wilson loops with Lagrangian insertion

IF 5.4 1区物理与天体物理

Journal of High Energy Physics Pub Date : 2025-04-02 DOI: 10.1007/JHEP04(2025)022

Dmitry Chicherin, Johannes Henn, Jaroslav Trnka, Shun-Qing Zhang

{"title":"Positivity properties of five-point two-loop Wilson loops with Lagrangian insertion","authors":"Dmitry Chicherin, Johannes Henn, Jaroslav Trnka, Shun-Qing Zhang","doi":"10.1007/JHEP04(2025)022","DOIUrl":"10.1007/JHEP04(2025)022","url":null,"abstract":"In this paper we discuss the geometric integrand expansion of the five-point Wilson loop with one Lagrangian insertion in maximally supersymmetric Yang-Mills theory. We construct the integrand corresponding to an all-loop class of ladder-type geometries. We then investigate the known two-loop observable from this geometric viewpoint. To do so, we evaluate analytically the new two-loop integrals corresponding to the negative geometry contribution, using the canonical differential equations method. Inspecting the analytic result, we present numerical evidence that in this decomposition, each piece has uniform sign properties, when evaluated in the Amplituhedron region. Finally, we present an alternative bootstrap approach for the ladder-type geometries. We find that certain minimal bootstrap assumptions can be satisfied at two loops, but lead to a contradiction at three loops. This suggests to us that novel alphabet letters are required at this loop order. Indeed studying planar three-loop Feynman integrals, we do identify novel pentagon alphabet letters.","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 4","pages":""},"PeriodicalIF":5.4,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP04(2025)022.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Taming flavour violation in the Inverse Seesaw

IF 5.4 1区物理与天体物理

Journal of High Energy Physics Pub Date : 2025-04-02 DOI: 10.1007/JHEP04(2025)027

Jonathan Kriewald, Ana M. Teixeira

{"title":"Taming flavour violation in the Inverse Seesaw","authors":"Jonathan Kriewald, Ana M. Teixeira","doi":"10.1007/JHEP04(2025)027","DOIUrl":"10.1007/JHEP04(2025)027","url":null,"abstract":"The Inverse Seesaw mechanism remains one of the most attractive explanations for the lightness of neutrino masses, allowing for natural low-scale realisations. We consider the prospects of a simple extension via 3 generations of sterile fermions — the so called ISS(3) — in what concerns numerous lepton flavour observables. In order to facilitate a connection between the Lagrangian parameters and low-energy data, we systematically develop new parametrisations of the Yukawa couplings. Relying on these new parametrisations to explore the parameter space, we discuss the complementary role of charged lepton flavour violation searches in dedicated facilities, as well as in lepton colliders (FCC-ee and μTRISTAN). Our results reveal the strong synergy of the different indirect searches in probing the distinct flavour sectors of the model. In particular, we show that in the absence of radiative decays ℓα → ℓβγ, sizeable rates for Z-penguin dominated observables could hint at a non-trivially mixed and non-degenerate heavy spectrum.","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 4","pages":""},"PeriodicalIF":5.4,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP04(2025)027.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Electromagnetic helicity flux operators in higher dimensions

IF 5.4 1区物理与天体物理

Journal of High Energy Physics Pub Date : 2025-04-02 DOI: 10.1007/JHEP04(2025)026

Wen-Bin Liu, Jiang Long, Xin-Hao Zhou

引用次数: 0

The CEGM NLSM

IF 5.4 1区物理与天体物理

Journal of High Energy Physics Pub Date : 2025-04-02 DOI: 10.1007/JHEP04(2025)030

Nick Early

{"title":"The CEGM NLSM","authors":"Nick Early","doi":"10.1007/JHEP04(2025)030","DOIUrl":"10.1007/JHEP04(2025)030","url":null,"abstract":"Studying quantum field theories through geometric principles has revealed deep connections between physics and mathematics, including the discovery by Cachazo, Early, Guevara and Mizera (CEGM) of a generalization of biadjoint scalar amplitudes. However, extending this to generalizations of other quantum field theories remains a central challenge. Recently it has been discovered that the nonlinear sigma model (NLSM) emerges after a certain zero-preserving deformation from tr(ϕ3). In this work, we find a much richer story of zero-preserving deformations in the CEGM context, yielding generalized NLSM amplitudes. We prove an explicit formula for the residual embedding of an n-point NLSM amplitude in a mixed n + 2 point generalized NLSM amplitude, which provides a strong consistency check on our generalization. We show that the dimension of the space of pure kinematic deformations is gcd(k, n) − 1, we introduce a deformation-compatible modification of the Global Schwinger Parameterization, and we include a new proof, using methods from matroidal blade arrangements, of the linear independence for the set of planar kinematic invariants for CEGM amplitudes. Our framework is compatible with string theory through recent generalizations of the Koba-Nielsen string integral to any positive configuration space X+(k, n), where the usual Koba-Nielsen string integral corresponds to X(2, n) = ( {mathcal{M}}_{0,n} ).","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 4","pages":""},"PeriodicalIF":5.4,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP04(2025)030.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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