Dipartimento di Fisica, Università di Trieste（的里雅斯特大学物理系）；INFN, Sezione di Trieste（意大利国家核物理研究所的里雅斯特分部）；Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences（中国科学院大学卡弗里理论科学研究所）；Laboratory for Theoretical Fundamental Physics, Institute of Physics, Ecole Polytechnique Fédérale de Lausanne（洛桑联邦理工学院物理研究所基础物理实验室）；CERN, Theoretical Physics Department（欧洲核子研究中心理论物理部）
Ankur, Lorenzo Di Pietro, Victor Gorbenko, Shota Komatsu, Veronica Sacchi
Motivated by a question of defining gauge-invariant observables in cosmology and by the close connection between perturbation theory in de Sitter (dS) and Anti-de Sitter (AdS), we study scalar electrodynamics in AdS in setups that are largely unexplored but relevant for dS physics. For photons with standard (Dirichlet) boundary conditions, we analyze charged scalars whose boundary conditions break the $U(1)$ symmetry. This leads to a nonstandard Higgs mechanism in which the gauge field acquires a one-loop mass without a classical vacuum expectation value. Using recent advances in perturbation theory in AdS, we compute this mass explicitly and evaluate charged-scalar four-point functions. We also provide an alternative derivation based on boundary Ward identities. For photons with alternate (Neumann) boundary conditions, where local charged operators are not gauge invariant, we construct physical observables by dressing charged fields with geodesic Wilson lines. These dressed operators have well-behaved conformal properties and unphysical photon modes decouple from their correlation functions. Explicit one-loop computations further reveal the decoupling of boundary field strengths, for which we provide a nonperturbative argument based on higher-form symmetry. Along the way, we explain the physical consequences of spontaneous breaking of higher-form symmetry in AdS, including the role of the tilt operator, the relation between one-form symmetry and endpoints of Wilson lines at the boundary, and a generalized-symmetry interpretation of conserved currents dual to bulk gauge fields.
Reconstructing cosmological correlators via dispersion: from cutting to dressing rules
Indian Institute of Technology Kanpur（坎普尔印度理工学院）；International Centre for Theoretical Sciences (ICTS-TIFR) Tata Institute of Fundamental Research（理论科学国际中心（ICTS-TIFR）塔塔基础研究所）
本文通过色散关系重构宇宙相关函数，利用切割规则和 dressing 规则，揭示了从树级 de Sitter 威滕图到晚期时间片相关函数的联系。
Quantum backreaction of $O(N)$-symmetric scalar fields and de Sitter spacetimes at the renormalization point: renormalization schemes and the screening of the cosmological constant
Out-of-time-ordered Correlators in de Sitter Revisited
Department of Physics and Astronomy, University of Kentucky（肯塔基大学物理与天文学系）；Racah Institute of Physics, The Hebrew University of Jerusalem（耶路撒冷希伯来大学拉卡物理研究所）；ORFE Department, Princeton University（普林斯顿大学运筹工程金融系）；Department of Physics, University of California, Santa Barbara（加州大学圣塔芭芭拉分校物理系）
Non-perturbative $\langle ϕ\rangle$, $\langle ϕ^2 \rangle$ and the dynamically generated scalar mass with Yukawa interaction in the inflationary de Sitter spacetime
Confinement Versus Screening in the Schwinger Model on AdS$_2$ from Bosonization and Tensor Networks
University of California, Los Angeles（加州大学洛杉矶分校）；Mani L. Bhaumik Institute for Theoretical Physics, University of California, Los Angeles（加州大学洛杉矶分校马尼·L·巴乌米克理论物理研究所）；Center for Quantum Science and Engineering, University of California, Los Angeles（加州大学洛杉矶分校量子科学与工程中心）
