Información del autor
Autor López Maroto, Antonio |
Documentos disponibles escritos por este autor (100)
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We calculate the one-loop effective potential of a scalar field in a Robertson-Walker background with scalar metric perturbations. A complete set of orthonormal solutions of the perturbed equations is obtained by using the adiabatic approximatio[...]texto impreso
López Maroto, Antonio ; Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la ; Gammaldi, Viviana | Amer Inst Physics | 2012If the present dark matter in the Universe annihilates into Standard Model particles, it must contribute to the gamma ray fluxes detected on the Earth. Here we briefly review the present constraints for the detection of gamma ray photons produce[...]texto impreso
Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la ; Dobado González, Antonio ; López Maroto, Antonio | IOP publishing ltd | 2008-10One of the most striking features found in the cosmic microwave background data is the presence of an anomalous cold spot (CS) in the temperature maps made by the Wilkinson Microwave Anisotropy Probe (WMAP). This CS has been interpreted as the r[...]texto impreso
Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la ; Dobado González, Antonio ; López Maroto, Antonio | IOP publishing ltd | 2008-10One of the most striking features found in the cosmic microwave background data is the presence of an anomalous cold spot (CS) in the temperature maps made by the Wilkinson Microwave Anisotropy Probe (WMAP). This CS has been interpreted as the r[...]texto impreso
It has long been known that the covariant formulation of quantum electrodynamics conflicts with the local description of states in the charged sector. Some of the solutions to this problem amount to modifications of the subsidiary conditions bel[...]texto impreso
López Maroto, Antonio ; Ruiz Cembranos, José Alberto ; Núñez Jareño, Santos José | IOP publishing ltd | 2014-03We show that the energy-momentum tensor of homogeneous fields of arbitrary spin in an expanding universe is always isotropic in average provided the fields remain bounded and evolve rapidly compared to the rate of expansion. An analytic expressi[...]texto impreso
López Maroto, Antonio ; Ruiz Cembranos, José Alberto ; Núñez Jareño, Santos José ; Hallabrin, C. | American Physical Society | 2012-07-10We consider homogeneous Abelian vector fields in an expanding universe. We find a mechanical analogy in which the system behaves as a particle moving in three dimensions under the action of a central potential. In the case of bounded and rapid e[...]texto impreso
López Maroto, Antonio ; Ruiz Cembranos, José Alberto ; Núñez Jareño, S. J. | American Physical Society | 2013-02-13We consider homogeneous non-Abelian vector fields with general potential terms in an expanding universe. We find a mechanical analogy with a system of N interacting particles (with N the dimension of the gauge group) moving in three dimensions u[...]texto impreso
The next generation of galaxy surveys will allow us to test one of the most fundamental assumptions of the standard cosmology, i.e. that gravity is governed by the general theory of relativity (GR). In this paper, we investigate the ability of t[...]texto impreso
Large-scale matter bulk flows with respect to the cosmic microwave background have very recently been detected on scales less than or similar to 100h(-1) Mpc and less than or similar to 300h(-1) Mpc by using two different techniques showing an e[...]texto impreso
Alcazar, J. ; Ruiz Cembranos, José Alberto ; Dobado González, Antonio ; López Maroto, Antonio | Amer Physical Soc | 2003-04In the context of the brane-world scenarios with compactified large extra dimensions, we study the production of the possible massive brane oscillations (branons) in electron-positron colliders. We compute their contribution to the electroweak g[...]texto impreso
Ruiz Cembranos, José Alberto ; López Maroto, Antonio ; Villarrubia Rojo, Héctor | Oxford Univ Press | 2020-09We explore the possibility that matter bulk flows could generate the required vorticity in the electron-proton-photon plasma to source cosmic magnetic fields through the Harrison mechanism. We analyze the coupled set of perturbed Maxwell and Bol[...]texto impreso
Cermeño, M. ; Carro, J. ; López Maroto, Antonio ; Pérez García, M. A. | IOP publishing ltd | 2019-02-20Using a perturbative approach we solve stellar structure equations for low-density (solar-type) stars whose interior is described with a polytropic equation of state in scenarios involving a subset of modified gravity (MG) theories. Rather than [...]texto impreso
López Maroto, Antonio ; Beltrán Jiménez, José ; Gottloeber, Stefan ; Yepes Alonso, Gustavo ; Knebe, Alexander ; Carlesi, Edoardo | Wiley-Blackwell | 2012-07We present the results of a series of cosmological N-body simulations of a vector dark energy (VDE) model, performed using a suitably modified version of the publicly available gadget-2 code. The set-ups of our simulations were calibrated pursui[...]texto impreso
We explore the different possibilities for branons as dark matter candidates. We consider a general brane-world model, parametrized by the number of extra dimensions, N, the fundamental scale of gravity M-D, the brane tension scale f, and the br[...]texto impreso
Ruiz Cembranos, José Alberto ; Gammaldi, Viviana ; López Maroto, Antonio | American Physical Society | 2014-08-07The spectral study of the HESS J1745-290 high-energy gamma-ray cutoff from the Galactic center is compatible with a signal of dark matter (DM) annihilation or decay. If this is the case, a neutrino flux from that source is also expected. We anal[...]texto impreso
Ruiz Cembranos, José Alberto ; López Maroto, Antonio ; Villarrubia Rojo, Héctor | IOP Publishing | 2019-06-18One of the fundamental assumptions of the standard Lambda CDM cosmology is that, on large scales, all the matter-energy components of the Universe share a common rest frame. This seems natural for the visible sector, that has been in thermal con[...]texto impreso
In this work we calculate the low-energy effective action for gravity with torsion, obtained after the integration of scalar and fermionic matter fields, using the local momentum representation based on the Riemann normal coordinates expansion. [...]texto impreso
Dark energy is usually parametrized as a perfect fliud with negative pressure and a certain equation of state. Besides, it is supposed to interact very weakly with the rest of the components of the universe and, as a consequence, there is no rea[...]texto impreso
López Maroto, Antonio ; Beltrán Jiménez, José | Progress Theoretical Physics Publication Office | 2011In this work we consider quantum electromagnetic fields in an expanding universe. We start by reviewing the difficulties found when trying to impose the Lorenz condition in a time dependent geometry. Motivated by this fact, we explore the possib[...]texto impreso
We discuss the existence of de Sitter inflationary solutions for the string-inspired fourth-derivative gravity theories with dilaton field. We consider a space-time of arbitrary dimension D and an arbitrary parametrization of the target space me[...]texto impreso
We analyze the claimed tension between redshift space distorsions measurements of f(z)sigma 8(z) and the predictions of standard Lambda CDM (Planck 2015 and 2018) cosmology. We consider a dataset consisting of 17 data points extending up to reds[...]texto impreso
It is well known that an extremely accurate parametrization of the growth function of matter density perturbations in ACDM cosmology, with errors below 0.25%, is given by f(a) = ?^(?)_(m)(a) with ? ? 0.55. In this work, we show that a simple mo[...]texto impreso
We consider the problem of parametrizing modified gravity theories that include an additional vector field in the sub-Hubble regime within the quasi-static approximation. We start from the most general set of second order equations for metric an[...]texto impreso
We study the production of massive fermions in arbitrary vector and axial-vector classical backgrounds using effective action techniques. A perturbative calculation shows the different features of each field and in particular it is seen that pur[...]