Información del autor
Autor López Maroto, Antonio |
Documentos disponibles escritos por este autor (100)
![](./images/expand_all.gif)
![](./images/collapse_all.gif)
![Selecciones disponibles](./images/orderby_az.gif)
![]()
texto impreso
In this paper we show how the nonlocal effective action for gravity, obtained after integrating out the matter fields, can be used to compute particle production and spectra for different space-time metrics. Applying this technique to several ex[...]![]()
texto impreso
López Maroto, Antonio ; Beltrán Jiménez, José ; Koivisto, Tomi S. ; Fonseca Mota, David | IOP publishing ltd | 2009-10It has been recently proposed that the presence of a temporal electromagnetic field on cosmological scales could explain the phase of accelerated expansion that the universe is currently undergoing. The field contributes as a cosmological consta[...]![]()
texto impreso
Ruiz Cembranos, José Alberto ; López Maroto, Antonio ; Núñez Jareño, Santos José | Springer | 2017-02-13We study the dynamics of cosmological perturbations in models of dark matter based on ultralight coherent vector fields. Very much as for scalar field dark matter, we find two different regimes in the evolution: for modes with k^(2) « Hma, we ha[...]![]()
texto impreso
Ruiz Cembranos, José Alberto ; Dobado González, Antonio ; López Maroto, Antonio | American Institute of Physics | 2003The recent proposal of theories with compactified large extra dimensions is reviewed. We pay especial attention to brane world models with low tension where the only relevant degrees of freedom at low energies are the Standard Model (SM) particl[...]![]()
texto impreso
Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la ; Dobado González, Antonio ; Lineros, R. ; López Maroto, Antonio | Amer Inst Physics | 2011If the present dark matter (DM) in the Universe annihilates into Standard Model (SM) particles, it must contribute to the gamma ray fluxes that are detected on the Earth. The magnitude of such contribution depends on the particular DM candidate,[...]![]()
texto impreso
Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la ; Dobado González, Antonio ; Lineros, R.A. ; López Maroto, Antonio | Amer Physical Soc | 2011-04-11If the present dark matter in the Universe annihilates into standard model particles, it must contribute to the fluxes of cosmic rays that are detected on the Earth and, in particular, to the observed gamma-ray fluxes. The magnitude of such a co[...]![]()
texto impreso
López Maroto, Antonio ; Ruiz Cembranos, José Alberto ; Gammaldi, Viviana | American Physical Society | 2012-11-06We show that the gamma ray spectrum observed with the HESS array of Cherenkov telescopes coming from the Galactic Center region and identified with the source HESS J1745-290 is well fitted by the secondary photons coming from dark matter (DM) an[...]![]()
texto impreso
We study the amplification of electromagnetic vacuum fluctuations induced by the evolution of scalar metric perturbations at the end of inflation. Such perturbations break the conformal invariance of Maxwell equations in Friedmann-Robertson-Walk[...]![]()
texto impreso
In this letter we provide a simple explanation of the recent finding of anisotropy in electromagnetic (EM) propagation claimed by Nodland and Ralston. We consider, as a possible origin of such effect, the effective coupling between EM fields and[...]![]()
texto impreso
We study the production of spin 3/2 particles in homogeneous scalar and gravitational backgrounds using the mode-mixing Bogolyubov method. Considering only the helicity +/-3/2 states, we can reduce the problem to a standard Dirac fermion calcula[...]![]()
texto impreso
López Maroto, Antonio ; Cruz Dombriz, Álvaro de la ; Ruiz Cembranos, José Alberto ; Gammaldi, Viviana ; Lineros, Roberto A. | Springer | 2013-09-13We study the differences in the gamma-ray spectra simulated by four Monte Carlo event generator packages developed in particle physics. Two different versions of PYTHIA and two of HERWIG are analyzed, namely PYTHIA 6.418 and HERWIG 6.5.10 in For[...]![]()
texto impreso
We consider the resonant production of fermions from an oscillating axial background. The classical evolution of the axial field is given by that of a massive pseudovector field, as suggested by the renormalizability of the theory. We look upon [...]![]()
texto impreso
Ruiz Cembranos, José Alberto ; Villarrubia Rojo, Héctor ; Llanes Estrada, Felipe José ; Garay Elizondo, Luis Javier ; López Maroto, Antonio ; Fernández Sanz, David | 2018-06-19Esta memoria contiene los principales resultados del proyecto de innovación docente número 34 de la convocatoria 2017/2018 que lleva por título "Software libre como herramienta de aprendizaje en mecánica".![]()
texto impreso
Finkel Morgenstern, Federico ; González López, Artemio ; López Maroto, Antonio ; Rodríguez, M.A. | American Institute of Physics | 2001The most general inflaton potential in Minkowski spacetime for which the differential equation for the Fourier modes of the matter fields reduces to Lame's equation is shown to be of the form V(?) = ? ? ^(4) /4 + K ?^( )2 /2 + ?/(2 ?^( 2) ) + V_[...]![]()
texto impreso
Ruiz Cembranos, José Alberto ; Dobado González, Antonio ; López Maroto, Antonio | IOP publishing ltd | 2007-06-22In this work, we will review the main properties of braneworld models with low tension. Starting from very general principles, it is possible to obtain an effective action for the relevant degrees of freedom at low energies (branons). Using the [...]![]()
texto impreso
López Maroto, Antonio ; Ruiz Cembranos, José Alberto ; Gammaldi, Viviana | IOP publishing ltd | 2013-04We study the main spectral features of the gamma-ray fluxes observed by the High Energy Stereoscopic System (HESS) from the J1745-290 Galactic Center source during the years 2004, 2005 and 2006. In particular, we show that these data are well fi[...]![]()
texto impreso
Using the Fujikawa and the heat-kernel methods we make a complete and detailed computation of the global, gauge, and gravitational anomalies in the standard model defined on a curved space-time with torsion. We find new contributions coming from[...]![]()
texto impreso
We analyze the sensitivity of galaxy and weak-lensing surveys to detect preferred directions in the gravitational interaction. We consider general theories of gravity involving additional vector degrees of freedom with non-vanishing spatial comp[...]![]()
texto impreso
Despite the success of Maxwell's electromagnetism in the description of the electromagnetic on small scales, we know very little about the behavior of electromagnetic fields on cosmological distances. Thus, it has been suggested recently that th[...]![]()
texto impreso
We study, within the recently proposed brane-world scenario, the effective action for the low-energy brane excitations. These modes are understood as Goldstone bosons associated to the spontaneous isometry breaking, induced on the bulk space by [...]![]()
texto impreso
We consider electromagnetic field quantization in an expanding universe We find that the covariant (Gupta Bleuler) method exhibits certain difficulties when trying to impose the quantum Lorenz condition on cosmological scales. We thus explore th[...]![]()
texto impreso
We study the high-energy equivalence between helicity ±1/2 gravitinos and Goldstinos in order to calculate the production of gravitinos in time-dependent scalar and gravitational backgrounds. We derive this equivalence for equations of motion, p[...]![]()
texto impreso
Finkel Morgenstern, Federico ; González López, Artemio ; López Maroto, Antonio ; Rodríguez González, Miguel Ángel | American Physical Society | 2000-10-17We show that the most general inflaton potential in Minkowski spacetime for which the differential equation for the Fourier modes of the matter fields reduces to Lame's equation is of the form V(phi)=lambda phi^4/4+Kphi^2/2+mu/(2 phi^2)+V_0. As [...]![]()
texto impreso
Albareti, F. D. ; Ruiz Cembranos, José Alberto ; López Maroto, Antonio | American Physical Society | 2014We consider the vacuum energy of massive quantum fields in an expanding universe. We define a conserved renormalized energy-momentum tensor by means of a comoving cutoff regularization. Using exact solutions for de Sitter space-time, we show tha[...]![]()
texto impreso
López Maroto, Antonio ; Beltrán Jiménez, José ; Yepes Alonso, Gustavo ; Carlesi, Edoardo ; Knebe, Alexander | Oxford University Press | 2011-12The detection of extremely massive clusters at z > 1 such as SPT-CL J0546-5345, SPT-CL J2106-5844 and XMMU J2235.3 2557 has been considered by some authors as a challenge to the standard ? cold dark matter cosmology. In fact, assuming Gaussian [...]