Zobrazeno 1 - 10
of 379
pro vyhledávání: '"González, Hernán"'
We apply the Hamiltonian formalism to investigate the massless sector of scalar field theory coupled with Maxwell electrodynamics through the Pontryagin term. Specifically, we analyze asymptotic symmetries at the null infinity of this theory, conserv
Externí odkaz:
http://arxiv.org/abs/2407.13866
Chiral shift symmetries of the massless free bosons in two dimensions are global symmetries that are somewhat similar to asymptotic symmetries. They are most transparent in double-null coordinates where they are parametrized by two functions of one v
Externí odkaz:
http://arxiv.org/abs/2405.17722
We analyze the backreaction of a class of scalar field self-interactions with the possibility of evolving from an AdS vacuum to a fixed point where the scalar field potential vanishes. Exact solutions which interpolate between these regions, ranging
Externí odkaz:
http://arxiv.org/abs/2307.16027
We study celestial amplitudes in string theory at one-loop. Celestial amplitudes describe scattering processes of boost eigenstates and relate to amplitudes in the more standard basis of momentum eigenstates through a Mellin transform. They are thus
Externí odkaz:
http://arxiv.org/abs/2307.03551
We discuss the emergence of a new symmetry generator in a Hamiltonian realisation of four-dimensional gauge theories in the flat space foliated by retarded (advanced) time. It generates an asymptotic symmetry that acts on the asymptotic fields in a w
Externí odkaz:
http://arxiv.org/abs/2304.03211
Transport properties are investigated in the two-dimensional dual dynamics of AdS$_{3}$ gravity. By providing boundary conditions that deform the ADM lapse and shift functions, we construct a lower dimensional model comprising two copies of chiral bo
Externí odkaz:
http://arxiv.org/abs/2109.05068
Autor:
González, Hernán A., Rojas, Francisco
The all-loop resummation of SU$(N)$ gauge theory amplitudes is known to factorize into an IR-divergent (soft and collinear) factor and a finite (hard) piece. The divergent factor is universal, whereas the hard function is a process-dependent quantity
Externí odkaz:
http://arxiv.org/abs/2104.12979
Publikováno v:
Phys. Rev. Lett. 126, 091602 (2021)
The conformal extension of the BMS$_{3}$ algebra is constructed. Apart from an infinite number of 'superdilatations,' in order to incorporate 'superspecial conformal transformations,' the commutator of the latter with supertranslations strictly requi
Externí odkaz:
http://arxiv.org/abs/2011.08197
Publikováno v:
Phys. Rev. D 102, 126027 (2020)
We study the effect of loop corrections to conformal correlators on the celestial sphere at null infinity. We first analyze finite one-loop celestial amplitudes in pure Yang-Mills theory and Einstein gravity. We then turn to our main focus: infrared
Externí odkaz:
http://arxiv.org/abs/2009.07290
Publikováno v:
Phys. Rev. D 101, 086024 (2020)
We provide the first steps towards a flat space holographic correspondence in two bulk spacetime dimensions. The gravity side is described by a conformally transformed version of the matterless Callan-Giddings-Harvey-Strominger model. The field theor
Externí odkaz:
http://arxiv.org/abs/1911.05739