Zobrazeno 1 - 10
of 28
pro vyhledávání: '"Torralba, Francisco José Maldonado"'
In this work we shall obtain sufficient conditions for the appearance of singularities in gravitational theories which propagate an extra vector degree of freedom, based on the known relaxations of the singularity theorems. We study the cases of a ge
Externí odkaz:
http://arxiv.org/abs/2303.17377
Autor:
Casado-Turrión, Adrián, de la Cruz-Dombriz, Álvaro, Jiménez-Cano, Alejandro, Torralba, Francisco José Maldonado
In this work, we study the junction conditions of the ghost-free subclass of quadratic Poincar\'e Gauge gravity, which propagates one scalar and one pseudo-scalar. For this purpose, we revisit the theory of distributions and junction conditions in gr
Externí odkaz:
http://arxiv.org/abs/2303.01206
Modified theories of gravity usually present new degrees of freedom, as well as higher order derivatives, wrong signs in certain terms and complicated couplings already present in the Lagrangian from the beginning or originated by the field redefinit
Externí odkaz:
http://arxiv.org/abs/2207.13431
In this work we study the stability of the four vector irreducible pieces of the torsion and the nonmetricity tensors in the general quadratic metric-affine Lagrangian in 4 dimensions. The goal will be to elucidate under which conditions the spin-1 m
Externí odkaz:
http://arxiv.org/abs/2205.05674
Autor:
Heredia, Carlos, Kolář, Ivan, Llosa, Josep, Torralba, Francisco José Maldonado, Mazumdar, Anupam
Publikováno v:
Class. Quantum Grav. 39 (2022) 085001
This article aims to transform the infinite-order Lagrangian density for ghost-free infinite-derivative linearized gravity into non-local. To achieve it, we use the theory of generalized functions and the Fourier transform in the space of tempered di
Externí odkaz:
http://arxiv.org/abs/2112.05397
The stable pseudo-scalar degree of freedom of the quadratic Poincar\'e Gauge theory of gravity is shown to be a suitable dark matter candidate. We find the parameter space of the theory which can account for all the predicted cold dark matter, and co
Externí odkaz:
http://arxiv.org/abs/2112.03957
Publikováno v:
Phys. Rev. D 105, 044045 (2022)
We present a new bouncing cosmological solution of the non-local theory known as infinite derivative gravity, which goes beyond the recursive ansatz, ${\Box R = r_1 R +r_2}$. The non-local field equations are evaluated using the spectral decompositio
Externí odkaz:
http://arxiv.org/abs/2109.02143
This thesis focuses on modifications on Einstein's theory of General Relativity, which could explain the current problems in gravitation and cosmology. More specifically, modifications of the affine structure of the spacetime, which is the structure
Externí odkaz:
http://arxiv.org/abs/2101.11523
Publikováno v:
Phys. Rev. D 103, 064078 (2021)
The junction conditions for the infinite derivative gravity theory ${R{+}RF(\Box)R}$ are derived under the assumption that the conditions can be imposed by avoiding the `ill-defined expressions' in the theory of distributions term by term in infinite
Externí odkaz:
http://arxiv.org/abs/2012.10349
In this manuscript we will present the theoretical framework of the recently proposed infinite derivative theory of gravity with a non-symmetric connection. We will explicitly derive the field equations at the linear level and obtain new solutions wi
Externí odkaz:
http://arxiv.org/abs/1911.08846