2 citations · 3 across the 8 of their papers we have counts for
10 papers
New constraints on modified gravity with dimension-six operators from gravitational waves
Justo López-Sarrión, Carlos M. Reyes, César Riquelme +1
The present article deals with gravitational-wave propagation affected by higher-derivative terms that break spacetime symmetries. Two dimension-6 contributions of the gravitationa…
Dipole ghosts and spontaneous symmetry breaking in higher-order Chern-Simons theory
Carlos M. Reyes, César Riquelme, Angel Sanchez
In this work, we investigate the emergence of dipole ghost structures in gauge theories at both the classical and quantum levels. Traditionally, dipole ghosts are introduced throug…
Geometric origin of the cosmological constant from Einstein-Chern-Simons gravity compactified to four dimensions
M. Cataldo, S. Lepe, C. Riquelme +1
We present a model in which the cosmological constant emerges as a purely geometric effect from the four-dimensional compactification of five-dimensional Einstein-Chern-Simons grav…
Gödel-symmetric backgrounds and explicit spacetime symmetry breaking
César Riquelme, Carlos M. Reyes, A. F. Santos
Explicit breaking of diffeomorphism symmetry with nondynamical background fields in gravitational theories can lead to inconsistencies between the equations of motion and the under…
Higher-order Chern-Simons extensions to QED in dimensions
Ricardo Avila, Albert Yu. Petrov, Carlos M. Reyes +2
In this work, we investigate radiative corrections in the higher-order extension of the Maxwell-Chern-Simons model coupled to standard spinor matter in dimensions. We begin a…
Cosmic Backgrounds in the Gravitational Standard-Model Extension
C. M. Reyes, C. Riquelme, M. Schreck +1
We consider background fields within the gravitational sector of the Standard-Model Extension (SME) in a cosmological setting. Our analysis is divided into two parts. The first par…
Cosmology with explicit and spontaneous background fields
Carlos M. Reyes, César Riquelme, Alex Soto
We study a general class of effective backgrounds that break diffeomorphism invariance and their potential roles in cosmology. Specifically, we examine both explicit and spontaneou…
Reduced geometry and its role in explicit spacetime symmetry violation
Carlos M. Reyes, César Riquelme, Marco Schreck +1
The incompatibility of explicit diffeomorphism violation with Riemannian geometry within the gravitational Standard-Model Extension (SME) is revisited. We review two methods of how…
Perturbative S-matrix unitarity and higher-order Lorentz violation
Justo López-Sarrión, Carlos M. Reyes, César Riquelme
We investigate the preservation of unitarity in a Lorentz and CPT-violating QED model containing higher-order operators. In particular, we consider modifications in the fermion sec…
Tree-level unitarity, causality and higher-order Lorentz and CPT violation
Justo Lopez-Sarrion, Carlos M. Reyes, Cesar Riquelme
Higher-order effects of CPT and Lorentz violation within the SME effective framework including Myers-Pospelov dimension-five operator terms are studied. The model is canonically qu…