Article
Physics, Particles & Fields
Martin Ammon, Sean Gray, Claire Moran, Michel Pannier, Katharina Woelfl
Summary: Flat-space holography relies on a deep understanding of BMS symmetry, with the oscillator construction of the highest-weight representation of the bms3 algebra showing consistency with known results. The study demonstrates that bms3-blocks exponentiate in the semi-classical limit, particularly when one central charge is large, and perturbatively computes heavy and heavy-light vacuum bms3-blocks.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Venkatesa Chandrasekaran, Antony J. Speranza
Summary: This paper explores the covariant phase space formalism applied to gravitational theories with null boundaries and proposes a new principle, based on holographic reasoning, to resolve the ambiguity in the definition of quasilocal charges. The study also analyzes the expression for the analog of the Brown-York stress tensor on the null surface, and provides a general formula for central extensions and anomalous transformation in the gravitational action. The research draws parallels between the fixed frame for the null normal and the holographic Weyl anomaly, with applications to near-horizon Virasoro symmetry leading to a derivation of fluxes and central charges.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Sebastian Cespedes, Anne-Christine Davis, Scott Melville
Summary: This paper focuses on the time evolution of scalar field correlators on de Sitter spacetime in the Schrodinger picture. Simple equations of motion and dynamical constants are used to partially fix wavefunction coefficients at weak coupling. The study also shows how to describe state evolution using constraints from de Sitter isometries and transfer functions, while removing divergences through renormalization of boundary wavefunctions using a Boundary Operator Expansion.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Nishant Gupta, Nemani V. Suryanarayana
Summary: We construct classical theories for scalar fields in arbitrary Carroll spacetimes that are invariant under Carrollian diffeomorphisms and Weyl transformations. When the local symmetries are gauge fixed these theories become Carrollian conformal field theories. We show that generically there are at least two types of such theories emerging in three (and higher) dimensions.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Kevin Nguyen, Jakob Salzer
Summary: Recent research has suggested that infrared divergences in perturbative gravitational scattering amplitudes are governed by the two-point function of the supertranslation Goldstone mode on the celestial sphere. The form of this celestial two-point function is derived from an effective action that also controls infrared divergences in the symplectic structure of General Relativity with asymptotically flat boundary conditions. This effective action plays a key role in a path integral formulation of a celestial conformal field theory, as demonstrated by the re-derivation of infrared soft factors in terms of celestial correlators. The analysis relies on a well-posed action principle introduced by Compere and Dehouck near spatial infinity.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Joaquim Gomis, Diego Hidalgo, Patricio Salgado-Rebolledo
Summary: The study presents the non-relativistic and Carrollian versions of Jackiw-Teitelboim gravity, demonstrating that there are no divergences in the non-relativistic and Carrollian limits in the second order formulation. By introducing a relativistic BF theory in the first order formalism, some divergences can be avoided.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Georgios K. Karananas, Mikhail Shaposhnikov, Sebastian Zell
Summary: In this study, it is found that scale-invariant Einstein-Cartan gravity with scalar matter fields can lead to an approximate conformal invariance of flat space particle theory up to the Planck mass. In the simplest setup, these models only contain one additional massless dilaton particle, in addition to the fields of the Standard Model and graviton. The theories of this type can provide a self-completion up to the Planck scale and produce inflationary predictions similar to the simplest Higgs-inflation scenario in metric theory of gravity.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Lam Hui, Austin Joyce, Ilia Komissarov, Klaas Parmentier, Luca Santoni, Sam S. C. Wong
Summary: We derive soft theorems for theories with spontaneously broken time symmetries, such as Lorentz boosts. These theorems involve unequal-time correlation functions with the insertion of a soft Goldstone in the far past. Explicit checks are done for examples like the relativistic superfluid effective theory and the effective field theory of inflation. We discuss how these unequal-time identities can capture information beyond equal-time correlators and when they can be framed as equal-time correlator identities.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Lakshya Bhardwaj
Summary: A class of 5d superconformal field theories can be constructed by integrating out BPS particles from 6d SCFTs compactified on a circle. The flavor symmetry of these 5d SCFTs can be extracted using geometric engineering in M-theory.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Aditya Mehra, Yaman Sanghavi
Summary: This paper establishes a single Lagrangian for Galilean electrodynamics using a covariant formalism for describing Galilean geometry. The Galilean conformal algebra and its representation in this formalism are presented, and the invariance of the Lagrangian under the Galilean conformal algebra in d = 4 is demonstrated, along with the calculation of the energy-momentum tensor.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Nabamita Banerjee, Arindam Bhattacharjee, Arpita Mitra
Summary: The study focuses on the scattering of a probe particle by a four-dimensional AdS-Schwarzschild black hole at large impact factor. The analysis is consistent perturbatively to leading order in the AdS radius and black hole mass parameter, and a correction to the well-known Classical Soft graviton theorem is found due to the presence of an AdS background.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Bin Chen, Peng-xiang Hao, Reiko Liu, Zhe-fei Yu
Summary: In this work, we develop conformal bootstrap for Galilean conformal field theory, discussing the concept of multiplets, negative norm states, and the inversion formula. Through harmonic analysis and the construction of GGFT, we lay the groundwork for applying Galilean conformal bootstrap.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Sabrina Pasterski, Andrea Puhm, Emilio Trevisani
Summary: Celestial diamonds encode the global conformal multiplets in 2D celestial CFT and provide a natural language for describing the conformally soft sector. Conformally soft charges can be expressed in terms of light ray integrals selecting modes of appropriate conformal weights. The top corners of Goldstone diamonds correspond to conformal Faddeev-Kulish dressings, and computing sub-leading conformally soft dressings is crucial for discovering nontrivial central extensions.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Ana Alonso-Serrano, Erickson Tjoa, Luis J. Garay, Eduardo Martin-Martinez
Summary: In this study, the relationship between the quantization of a massless scalar field on a two-dimensional Einstein cylinder and a spacetime with a time machine is investigated. A unique prescription for the state of the zero mode in the Einstein cylinder is determined by the time machine geometry. The regularization of the zero mode state as a squeezed state proposed previously is related to the time-machine warp parameter, demonstrating that quantization in the latter context regularizes the quantization in an Einstein cylinder.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Michele Arzano
Summary: The study shows that the structure of the state associated with the inertial vacuum in Minkowski space-time can be described through a thermofield double. Additionally, it is found that the key factor for vacuum thermal effects is the presence of a horizon rather than acceleration.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Eduardo Conde, Euihun Joung, Karapet Mkrtchyan
JOURNAL OF HIGH ENERGY PHYSICS
(2016)
Article
Physics, Particles & Fields
Euihun Joung, Karapet Mkrtchyan
JOURNAL OF HIGH ENERGY PHYSICS
(2016)
Article
Physics, Particles & Fields
Dario Francia, Gabriele Lo Monaco, Karapet Mkrtchyan
JOURNAL OF HIGH ENERGY PHYSICS
(2017)
Article
Physics, Multidisciplinary
Karapet Mkrtchyan
PHYSICAL REVIEW LETTERS
(2018)
Article
Physics, Multidisciplinary
Stefan Fredenhagen, Olaf Krueger, Karapet Mkrtchyan
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Particles & Fields
Stefan Fredenhagen, Olaf Krueger, Karapet Mkrtchyan
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
Joaquim Gomis, Euihun Joung, Axel Kleinschmidt, Karapet Mkrtchyan
Summary: The paper presents a generalization of the three-dimensional Poincare algebra that includes a color symmetry factor, which can be used to define colored Poincare gravity and study generalized particle models. Different particle models based on colored Poincare symmetry orbits are discussed, serving as a starting point for describing particles interacting with a nonabelian background field or as a worldline formulation for associated quantum field theory.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Multidisciplinary
Zhirayr Avetisyan, Oleg Evnin, Karapet Mkrtchyan
Summary: A Lagrangian for general nonlinear electrodynamics has been constructed that treats electric and magnetic potentials equally. This formulation allows for the straightforward imposition of discrete and continuous electric-magnetic duality symmetries, leading to a simple theory with SO(2) duality invariance. When applied to the conformally invariant case, this construction provides a manifestly duality-symmetric formulation of the recently discovered ModMax theory. The potential generalization of this approach to p-forms in 2p dimensions is briefly discussed.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Particles & Fields
Zhirayr Avetisyan, Oleg Evnin, Karapet Mkrtchyan
Summary: In our previous article, we introduced a novel Lagrangian formulation for general nonlinear electrodynamics in four dimensions. The expanded formalism covers interactions of higher form field theories in arbitrary dimensions, providing a broader class of interactions than previous attempts in the literature.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Karapet Mkrtchyan, Mantas Svazas
Summary: The study in nonlinear electrodynamics establishes general results such as reconstructing NED Lagrangian through electromagnetic duality symmetry, introducing algorithms for constructing new SO(2) invariant NED theories, and showing properties of NED solutions leading to regular black holes.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Karapet Mkrtchyan, Fridrich Valach
Summary: We propose a universal democratic Lagrangian theory for the bosonic sector of ten-dimensional type II supergravities, treating the electric and magnetic potentials of all Ramond-Ramond (RR) fields equally. In the case of type IIB, this theory includes the five-form and its self-duality equation derived from the Lagrangian. We also present an alternative form of the action for type IIB, exhibiting manifest SL(2; R) symmetry.
Article
Astronomy & Astrophysics
Maxim Grigoriev, Karapet Mkrtchyan, Evgeny Skvortsov
Article
Astronomy & Astrophysics
Stefan Fredenhagen, Olaf Krueger, Karapet Mkrtchyan
Article
Astronomy & Astrophysics
Pan Kessel, Karapet Mkrtchyan