Información del autor
Autor Dobado González, Antonio |
Documentos disponibles escritos por este autor (124)
texto impreso
In this work we review briefly the origin and history of the cosmological constant and its recent reincarnation in the form of the dark energy component of the universe. We also comment on the fundamental problems associated to its existence and[...]texto impreso
Dobado González, Antonio ; Peláez Sagredo, José Ramón ; Urdiales, M.T. | American Physical Society | 1997-12-01In this work we study the applicability of the equivalence theorem, either for unitary models or within an effective Lagrangian approach. There are two types of limitations: the existence of a validity energy window and the use of the lowest ord[...]texto impreso
texto impreso
Cruz Dombriz, Álvaro de la ; Dobado González, Antonio ; López Maroto, Antonio | American Physical Society | 2009-12In the context of f(R) theories of gravity, we address the problem of finding static and spherically symmetric black hole solutions. Several aspects of constant curvature solutions with and without electric charge are discussed. We also study th[...]texto impreso
Dobado González, Antonio ; Cruz Dombriz, Álvaro de la ; López Maroto, Antonio | IOP publishing ltd | 2010In the context of f(R) gravity theories, the issue of finding static and spherically symmetric black hole solutions is addressed. Two approaches to study the existence of such solutions are considered: first, constant curvature solutions, and s[...]texto impreso
Ruiz Cembranos, José Alberto ; Dobado González, Antonio ; López Maroto, Antonio | American Physical Society | 2002-01-15In the context of a brane world and including an induced curvature term in the brane action, we obtain the effective Lagrangian for the Goldstone bosons (branons) associated with the spontaneous breaking of the translational invariance in the bu[...]texto impreso
Ruiz Cembranos, José Alberto ; Dobado González, Antonio ; López Maroto, Antonio | American Physical Society | 2003-07-20We show that, in the context of brane-world scenarios with low tension [tau]=f^4, massive brane fluctuations (branons) are natural dark matter candidates. We calculate the present abundances for both hot (warm) and cold branons in terms of the b[...]texto impreso
Ruiz Cembranos, José Alberto ; Delgado López, Rafael ; Dobado González, Antonio | American Physical Society | 2013-10-29We explore the viscosities of a photon gas by means of the Euler-Heisenberg effective theory and quantum electrodynamics at zero electron chemical potential. We find parametric estimates that show a very large shear viscosity and an extremely sm[...]texto impreso
Ruiz Cembranos, José Alberto ; Dobado González, Antonio ; López Maroto, Antonio | World Scientific Publ Co Pte Ltd | 2005This is a brief introduction to branon physics and its role in the dark matter problem. We pay special attention to the phenomenological consequences, both in high-energy particle physics experiments and in astrophysical and cosmological observa[...]texto impreso
Ruiz Cembranos, José Alberto ; Dobado González, Antonio ; López Maroto, Antonio | Amer Physical Soc | 2006-02In the context of brane-world scenarios, we study the effects produced by the exchange of virtual massive branons. A one-loop calculation is performed which generates higher-dimensional operators involving SM fields suppressed by powers of the b[...]texto impreso
Ruiz Cembranos, José Alberto ; Dobado González, Antonio ; López Maroto, Antonio | American Physical Society | 2004-11In the context of the brane-world scenarios with compactified extra dimensions, we study the production of brane fluctuations (branons) in hadron colliders (p (p) over bar, pp, and e(+/-)p) in terms of the brane tension parameter f, the branon m[...]texto impreso
Dobado González, Antonio ; Llanes Estrada, Felipe José ; Torres Rincón, Juan M. | American Institute of Physics | 2010We introduce the concept of viscosity (both shear and bulk) in the context of hadron physics. and in particular the meson gas, highlighting the current theoretical efforts to connect possible measurements of the viscosities to underlying physics[...]texto impreso
In this work we consider the spontaneous symmetry breaking of the electroweak SU(2)_(L) × U(1)_(Y) gauge group into U(1)_(em) taking place in the Standard Model of particle physics as seen from the point of view of an accelerating observer. Acco[...]texto impreso
Dobado González, Antonio ; Llanes Estrada, Felipe José ; Torres Rincón, Juan Miguel | Springer | 2012-02We show how the measurement of appropriately constructed particle-energy/momentum correlations allows access to the bulk viscosity of strongly interacting hadron matter in heavy-ion collisions. This measurement can be performed by the LHC and RH[...]texto impreso
In this work, we deal with the critical behavior of the bulk viscosity in the linear sigma model (L?M) as an example of a system which can be treated by using different techniques. Starting from the Boltzmann-Uehling-Uhlenbeck equation, we compu[...]texto impreso
Dobado González, Antonio ; Llanes Estrada, Felipe José ; Torres Rincón, Juan M. | Elsevier Science BV | 2011-08-03We study the bulk viscosity of a pion gas in unitarized Chiral Perturbation Theory at low and moderate temperatures, below any phase transition to a quark-gluon plasma phase. We argue that inelastic processes are irrelevant and exponentially sup[...]texto impreso
We calculate the bulk viscosity of a pion gas at low energies within the kinetic theory approach and show the importance of dealing properly with the zero modes of this transport coefficient.texto impreso
Dobado González, Antonio ; Herrero, M. J. ; Peláez Sagredo, José Ramón ; Morales, E.R. | American Physical Society | 2000-09-01We present a unified analysis of the two main production processes of vector boson pairs at the CERN LHC, VV-fusion and q (q) over bar annihilation, in a minimal strongly interacting electroweak symmetry breaking sector. Using a unitarized elect[...]texto impreso
In the general framework of chiral lagrangians we compute the leading log contribution to the three boson coupling in the standard model coming from eventual new physics. We apply the results, together with a complete analysis of the background [...]texto impreso
We propose a method to derive the low-energy effective action of QCD assuming that the long-distance properties of strong interactions can be described by a string theory. We bypass the usual problems related to the existence of the tachyon and [...]texto impreso
An effective SU(2)L X U(1)Y invariant chiral lagrangian can accommodate any symmetry breaking scheme in the standard model. It is shown that all process-independent quantities relevant to LEP precision measurements (DELTA-rho, DELTA-K and DELTA-[...]texto impreso
Within chiral perturbation theory, we study elastic pion scattering in the I=0,J=2, channel, whose main features are the f(1270) resonance and the vanishing of the lowest order. By means of a chiral model that includes an explicit resonance coup[...]texto impreso
In this work we study the thermodynamic properties of the pion gas starting from the realistic elastic scattering phase shifts obtained from chiral perturbation theory and using the virial expansion. In particular we study the equation of state [...]texto impreso
Delgado López, Rafael ; Dobado González, Antonio ; Espada, Miguel ; Llanes Estrada, Felipe José ; León Merino, Iván | Springer | 2018-11-05We estimate production cross sections for 2-body resonances of the Electroweak Symmetry Breaking sector (in W_(L)W_(L) and Z_(L)Z_(L) rescattering) from ?? scattering. We employ unitarized Higgs Effective Field Theory amplitudes previously compu[...]texto impreso
texto impreso
Ruiz Cembranos, José Alberto ; Dobado González, Antonio ; López Maroto, Antonio | American Physical Society | 2003-11We consider a general brane-world model parametrized by the brane tension scale f and the branon mass M. For a low tension compared to the fundamental gravitational scale, we calculate the relic branon abundance and its contribution to the cosmo[...]texto impreso
Cruz Dombriz, Álvaro de la ; Dobado González, Antonio ; López Maroto, Antonio | Amer Inst Physics | 2009In the context of f(R) theories of gravity, we study the cosmological evolution of scalar perturbations by using a completely general procedure. We find that the exact fourth-order differential equation for the matter density perturbations in th[...]texto impreso
Dobado González, Antonio ; Bargueño, P. ; Gonzalo Fonrodona, Isabel | EPL Association, European Physical Society | 2008-04We examine the effect of cold dark matter on the discrimination between the two enantiomers of a chiral molecule. We estimate the energy difference between the two enantiomers due to the interaction between fermionic WIMPs (weak interacting mass[...]texto impreso
Delgado López, Rafael ; Dobado González, Antonio ; Llanes Estrada, Felipe José | Springer | 2017-03-31We define and calculate helicity partial-wave amplitudes for processes linking the Electroweak Symmetry Breaking Sector (EWSBS) to ? ? , employing (to NLO) the Higgs-EFT (HEFT) extension of the Standard Model and the Equivalence Theorem, while n[...]texto impreso
Ruiz Cembranos, José Alberto ; Dobado González, Antonio ; López Maroto, Antonio | World Scientific Publ Co Pte Ltd | 2004-12Extra-dimensional theories contain additional degrees of freedom related to the geometry of the extra space which can be interpreted as new particles. Such theories allow to reformulate most of the fundamental problems of physics from a complete[...]texto impreso
Ruiz Cembranos, José Alberto ; Dobado González, Antonio ; López Maroto, Antonio | American Physical Society | 2006-03We study the possibility to explain the nonbaryonic dark matter abundance and improve the present fits on the muon anomalous magnetic moment through the same new physics. In this work we show that massive brane fluctuations (branons) in large ex[...]texto impreso
The possibility of a heavy supersymmetric spectrum at the Minimal Supersymmetric Standard Model is considered and the decoupling from the low energy electroweak scale is analyzed in detail. The formal proof of decoupling of supersymmetric partic[...]texto impreso
Dobado González, Antonio ; Herrero, M.J. ; Peñaranda, Siannah | World Scientific Publ Co Pte Ltd | 1998A heavy supersymmetric spectrum at the Minimal Supersymmetric Standard Model is considered and the decoupling from the low energy electroweak scale is analyzed. A formal and partial proof of decoupling of supersymmetric particles in the limit wh[...]texto impreso
In this work we report on the results obtained in a detailed and systematical study of the possibility to measure the parameters appearing in the electroweak chiral lagrangian. The main novelty of our approach is that we do not use the equivalen[...]texto impreso
In this paper we study the Yukawa Higgs-quark-quark interactions that are generated from radiative corrections of squarks and gluinos, in the minimal supersymmetric standard model. We compute the corrections to the effective action for Higgs and[...]texto impreso
Dobado González, Antonio ; Llanes Estrada, Felipe José ; Rodríguez Fernández, David | World Scientific Publ Co Pte Ltd | 2016-07-30We point out that in the early universe, for temperatures in the approximate interval 150-80 MeV (after the quark-gluon plasma), pions carried a large share of the entropy and supported the largest inhomogeneities. Its thermal conductivity (prev[...]texto impreso
Cruz Dombriz, Álvaro de la ; Dobado González, Antonio ; López Maroto, Antonio | Amer Physical Soc | 2011-01-25texto impreso
texto impreso
texto impreso
Dobado González, Antonio ; Llanes Estrada, Felipe José ; Torres Rincón, Juan M. | American Physical Society | 2009-01-07We present a calculation of eta/s for the meson gas (zero baryon number), with the viscosity computed within unitarized next-to-leading-order chiral perturbation theory, and confirm the observation that eta/s decreases towards the possible phase[...]texto impreso
Dobado González, Antonio ; Llanes Estrada, Felipe José ; Torres Rincón, Juan M. | Amer Inst Physics | 2009The viscosity over entropy density ratio, or KSS number, can help isolate the critical point in the hadron phase-diagram in Relativistic Heavy Ion Collisions. We argue that this quantity does have a minimum at a phase transition or crossover. A[...]texto impreso
Cruz Dombriz, Álvaro de la ; Dobado González, Antonio ; López Maroto, Antonio | American Physical Society | 2008-06In the context of f(R) theories of gravity, we study the evolution of scalar cosmological perturbations in the metric formalism. Using a completely general procedure, we find the exact fourth-order differential equation for the matter density pe[...]texto impreso
Dobado González, Antonio ; Llanes Estrada, Felipe José ; Oller, Jose Antonio | Amer Physical Soc | 2012-01-20In general relativity, there is a maximum mass allowed for neutron stars that, if exceeded, entails collapse into a black hole. Its precise value depends on details of the nuclear matter equation of state, a subject where much progress has been [...]texto impreso
In this work we consider the possibility of describing the current evolution of the universe, without the introduction of any cosmological constant or dark energy (DE), by modifying the Einstein-Hilbert (EH) action. In the context of the f(R) gr[...]texto impreso
Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la ; Dobado González, Antonio ; Lineros, R. ; López Maroto, Antonio | IOP publishing ltd | 2011Annihilation of different dark matter (DM) candidates into Standard Model (SM) particles could be detected through their contribution to the gamma ray fluxes that are measured on the Earth. The magnitude of such contributions depends on the part[...]texto impreso
We apply the one-loop results of the SU(3)L X SU(3)R chiral perturbation theory supplemented with the inverse-amplitude method to fit the available experimental data on pipi and piK scattering. With essentially only three parameters we describe [...]texto impreso
Dobado González, Antonio ; Tabares Cheluci, Lourdes ; Peñaranda , Siannah | American Physical Society | 2007-04In this work we compute the contributions to the Higgs effective potential coming from the fermion and gauge boson sectors at the one-loop level in the context of the SU(5)/SO(5) littlest Higgs (LH) model using a cutoff Lambda and including all [...]texto impreso
Dobado González, Antonio ; Morales, J. ; Peláez Sagredo, José Ramón ; Urdiales, M.T. | Elsevier Science BV | 1996-10-24In this paper we study the large N limit of the Standard Model Higgs sector with N lambda, Ng(2) and Ng('2) constant and N being the number of would-be Goldstone bosons, Despite the simplicity of this method at leading order, its results satisfy[...]texto impreso
texto impreso
Based on a dispersive approach, we apply the inverse amplitude method to unitarize one-loop SU(2) and SU(3) chiral perturbation theory. Numerically, we find that this unitarization technique yields the correct complex analytic structure in terms[...]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
Dobado González, Antonio ; Herrero, M. J. ; Pelaez, J.H. ; Morales, E.R. ; Urdiales, M.T. | Elsevier Science BV | 1995-06-15In the present work we study the predictions for WZ and ZZ production at the LHC with the Electroweak Chiral Lagrangian (EChL) approach. Our analysis will be focused on the less favored case from the experimental point of view, in which the pred[...]texto impreso
Llanes Estrada, Felipe José ; Dobado González, Antonio ; Delgado López, Rafael | IOP publishing ltd | 2014-02The claimed finding of a light Higgs boson makes the minimal Standard Model unitary. Yet, we recall that the general low-energy dynamics for the minimal electroweak symmetry breaking sector with three Goldstone bosons and one light scalar is not[...]texto impreso
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
Dobado González, Antonio ; Llanes Estrada, Felipe José ; Torres Rincón, Juan M. | American Physical Society | 2009-12We reexamine the possibility of employing the viscosity over entropy density ratio as a diagnostic tool to identify a Phase transition in hadron physics to the strongly coupled quark-gluon plasma and other circumstances where direct measurement [...]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
By the use of a simple phenomenological string model, the energy lost by the top quark through nonperturbative fragmentation effects before its weak decay is computed. This energy lost is in first approximation proportional to the rate between t[...]texto impreso
In this work we present the results of a complete calculation of the gamma gamma --> pi(0) pi(0) amplitude to leading order in the large N approximation (N being the number of Goldstone bosons) up to order m(pi)(2)/F-2, The amplitude turns to b[...]texto impreso
In SU(5)/SO(5) little Higgs models radiative corrections give rise to SU(2)(L)xU(1)(Y) symmetry breaking. In this work we start a program for a detailed determination of the relevant terms of the effective Higgs potential by computing the contri[...]texto impreso
We develop an alternative formulation of the symmetry breaking sector of the Standard Model as a gauged non-linear sigma model (NLSM) following the philosophy of the Chiral lagrangian approach, which is the only compatible with all the experimen[...]texto impreso
In this letter we show how it is possible to obtain the large N(f) limit of chiral perturbation theory (chi-PT) in the chiral limit. In particular, we compute explicitly the Nambu-Goldstone boson (NGB) elastic scattering amplitude to leading ord[...]texto impreso
Albareti, F. D. ; Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la ; Dobado González, Antonio | IOP publishing ltd | 2013-07Raychaudhuri equation is found provided that particular energy conditions are assumed and regardless the considered solution of the Einstein's equations. This fact is usually interpreted as a manifestation of the attractive character of gravity.[...]texto impreso
In the near future, the DIRAC collaboration will measure pi pi scattering lengths with great precision. Those measurements are likely to shed some light on the problem of the size of the chiral [0\(q) over bar q\0] condensate. Although it is usu[...]texto impreso
A computation of the quotient of shear viscosity and entropy density, or the Kovtun, Son and Starinets (KSS) number eta/s, is performed in the non-relativistic and classical regime, first in chiral perturbation theory, and then in the SO(g + 1)I[...]texto impreso
Alvarez Estrada, R F ; Dobado González, Antonio ; Gómez Nicola, Ángel | Elsevier Science BV | 1993-12-23We discuss the finite temperature extension of the anomalous Wess-Zumino-Witten lagrangian. The finite temperature S1 x S3 compactification makes a structure in disconnected sectors, corresponding to different baryon numbers appear naturally. Th[...]texto impreso
Alvarez Estrada, R F ; Dobado González, Antonio ; Gómez Nicola, Ángel | Elsevier Science BV | 1994-04-07We analyze the finite temperature (T) extension of the Wess-Zumino-Witten functional, discussed in a previous work, to one loop in chiral perturbation theory. As a phenomenological application, we calculate finite temperature corrections to the [...]texto impreso
texto impreso
Llanes Estrada, Felipe José ; Delgado López, Rafael ; Dobado González, Antonio | Springer | 2014-02-27By including the recently discovered Higgs-like scalar phi in the Electroweak Chiral Lagrangian, and using the Equivalence Theorem, we carry out the complete one-loop computation of the elastic scattering amplitude for the longitudinal component[...]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
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
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
By using chiral perturbation theory and the Uehling-Uhlenbeck equation we compute the viscosity of a pion gas, in the low temperature and low density regime, in terms of the temperature and the pion fugacity. The viscosity turns out to be propor[...]texto impreso
We compute the large N effective action of the O(N + 1)/O(N) nonlinear a model including the effect of the pion mass to order m(pi)(2)/f(pi)(2). This action is more involved than the one corresponding to rr the chiral limit not only due to the p[...]texto impreso
In this work we use the recently proposed large-N limit of chiral perturbation theory at the leading order and in the chiral limit, to fit the pion scattering. We compute the effective action for pions in this approximation which is non-local. F[...]texto impreso
Delgado López, Rafael ; Dobado González, Antonio ; Llanes Estrada, Felipe José | American Physical Society | 2015-06-04We propose and theoretically study a possible new resonance caused by strong coupling between the Higgs-Higgs and the W_LW_L (Z_L Z_L) scattering channels, without regard to the intensity of the elastic interaction in either channel at low energ[...]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
Dobado González, Antonio ; Guo, Feng-Kuo ; Llanes Estrada, Felipe José | IOP publishing ltd | 2015-12-01We are exploring a generic strongly-interacting Electroweak Symmetry Breaking Sector (EWSBS) with the low-energy effective field theory for the four experimentally known particles (W_L^±, Z_L, h) and its dispersion-relation based unitary extensi[...]texto impreso
Dobado González, Antonio ; Guo, Feng-Kuo ; Llanes Estrada, Felipe José | IOP publishing ltd | 2015-12-01We are exploring a generic strongly-interacting Electroweak Symmetry Breaking Sector (EWSBS) with the low-energy effectie field theory for the four experimentally known particles (W^(±)_(L), Z_(L), h) and its dispersion-relation based unitary ex[...]texto impreso
Delgado López, Rafael ; Dobado González, Antonio ; Espriu, D. ; García García, C. ; Herrero, M.J. ; Marcano, X. ; Sanz Cillero, Juan José | Springer | 2017-11-16In the present work we study the production of vector resonances at the LHC by means of the vector boson scattering W Z ? W Z and explore the sensitivities to these resonances for the expected future LHC luminosities. We are assuming that these [...]texto impreso
Dobado González, Antonio ; Tabares Cheluci, Lourdes ; Peñaranda, Siannah ; Rodríguez Laguna, Javier | Springer | 2010-04In this work we compute the radiative corrections to the Higgs mass and the Higgs quartic couplings coming from the Higgs sector itself and the scalar fields phi in the Littlest Higgs (LH) model. The restrictions that the new contributions set o[...]texto impreso
Dobado González, Antonio ; Llanes Estrada, Felipe José ; Sanz Cillero, Juan José | Springer | 2018-03-26We examine the production of W h and Zh pairs at the LHC in the context of a Strongly Interacting Symmetry Breaking Sector of the Standard Model. Our description is based on a non-linear Higgs Effective Theory, including only the Standard Model [...]texto impreso
Dobado González, Antonio ; Herrero, M. J. ; Hollik, W. ; Peñaranda , Siannah | American Physical Society | 2002-11-01We investigate the decoupling properties of the Higgs-sector-induced one-loop corrections in the lightest Higgs-boson self-couplings, in the framework of the minimal supersymmetric standard model (MSSM). The renormalized n-point vertex functions[...]texto impreso
Llanes Estrada, Felipe José ; Dobado González, Antonio ; Torres Rincón, Juan M. | American Physical Society | 2013-09-12We explore the viscosities of a photon gas by means of the Euler-Heisenberg effective theory and quantum electrodynamics at zero electron chemical potential. We find parametric estimates that show a very large shear viscosity and an extremely sm[...]texto impreso
Manuel, Cristina ; Dobado González, Antonio ; Llanes Estrada, Felipe José | Int School Advanced Studies | 2005-09We compute the mean free path and shear viscosity in the color-flavor locked (CFL) phase of dense quark matter at low temperature T, when the contributions of mesons, quarks and gluons to the transport coefficients are Boltzmann suppressed. CFL [...]texto impreso
We consider the minimal low-energy action for gravity up to six derivatives which is renormalizable at the two-loop level modulo higher derivative corrections. Then we study the classical solutions corresponding to the Schwarzschild and the Robe[...]texto impreso
texto impreso
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
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
This article presents a number of technical tools and results that may be instrumental to discern the nature of the Higgs particle. In scenarios where an additional strongly interacting sector is present in the electroweak theory, resulting in a[...]texto impreso
Delgado López, Rafael ; Dobado González, Antonio ; Llanes Estrada, Felipe José | American Institute of Physics (AIP) | 2016The apparent finding of a 125 GeV light Higgs boson would close the minimal Standard Model (SM), that is weakly interacting. This is an exceptional feature not generally true if new physics exists beyond the mass gap found at the LHC up to 700 G[...]texto impreso
Dobado González, Antonio ; Delgado López, Rafael ; Llanes Estrada, Felipe José | American Institute of Physics | 2014The apparent finding of a 125-GeV light Higgs boson closes unitarity of the minimal Standard Model (SM), that is weakly interacting: this is an exceptional feature not generally true if new physics exists beyond the mass gap found at the LHC up [...]texto impreso
Delgado López, Rafael ; Dobado González, Antonio ; Llanes Estrada, Felipe José | Elsevier Sciende BV | 2016-04Recently, a new boson h has been discovered at the LHC which, so far, is compatible with the properties of the SM Higgs. However, the SM is not the most general low-energy dynamics for the minimal electroweak symmetry breaking sector with three [...]texto impreso
If the symmetry-breaking sector of the standard model is strongly interacting, the low-energy dynamics of the longitudinal components of the weak bosons can be described by a nonlinear-sigma-model with two free parameters. For a large range of t[...]texto impreso
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
In this work we derive the version of the Equivalence Theorem that applies when the symmetry breaking sector of the Standard Model is described by a general chiral lagrangian. The demonstration is valid for renormalized fields for any value of t[...]texto impreso
texto impreso
We study the heavy Higgs sector of the MSSM composed of the H+/-, H-0 and A(0) particles in the so-called decoupling limit where m(A0) > > m(z) By integrating out these heavy Higgs particles to one-loop, we compute the effective action for the [...]texto impreso
texto impreso
We evaluate the ratio of shear viscosity to entropy density in a pion gas employing the Uehling-Uehlenbeck equation and experimental phase-shifts parameterized by means of the SU(2) inverse amplitude method. We find that the ratio for this monoc[...]texto impreso
Albareti, F. D. ; Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la ; Dobado González, Antonio | IOP Publishing | 2014In this work we address the issue of studying the conditions required to guarantee the Focusing Theorem for both null and time like geodesic congruences by using the Raychaudhuri equation. In particular we study the case of Friedmann-Robertson-W[...]texto impreso
In this paper we apply a simple phenomenological model to describe the scattering amplitudes of strongly interacting longitudinal gauge bosons at the future pp colliders, LHC and SSC. The model is based on the use of the well-known techniques fr[...]texto impreso
In the framework of the minimal supersymmetric standard model we compute the one-loop effective action for the electroweak bosons obtained after integrating out the different sleptons, squarks, neutralinos and charginos, and present the result i[...]texto impreso
Dobado González, Antonio ; Llanes Estrada, Felipe José ; Torres Rincón, Juan M. | American Institute of Physics | 2008In this work we briefly review the Kovtun-Son-Starinet (KSS) computation of the ratio eta/s for quantum field theories with gravitational dual and the related conjecture that it is bound from below by 1/4 pi. We discuss the validity of the bound[...]texto impreso
Gómez Nicola, Ángel ; Dobado González, Antonio ; Llanes Estrada, Felipe José | American Institute of Physics | 2003We report on our recent work about the description of a meson gas below the chiral phase transition within the framework of Chiral Perturbation Theory. As an alternative to the standard treatment, we present a calculation of the quark condensate[...]texto impreso
Dobado González, Antonio ; Gómez Nicola, Ángel ; Llanes Estrada, Felipe José ; Peláez Sagredo, José Ramón | Amer Physical Soc | 2002-11We study the temperature evolution of the rho and sigma mass and width, using a unitary chiral approach. The one-loop pipi scattering amplitude in chiral perturbation theory at Tnot equal0 is unitarized via the inverse amplitude method. Our resu[...]texto impreso
Castillo, Andrés ; Delgado López, Rafael ; Dobado González, Antonio ; Llanes Estrada, Felipe José | Springer | 2017-07-01By considering a non-linear electroweak chiral Lagrangian, including the Higgs, coupled to heavy quarks, and the equivalence theorem, we compute the one-loop scattering amplitudes W^(+)W^(?) ? t?, Z Z ? t? and hh ? t? (in the regime M^(2)_(t)/v^[...]texto impreso
texto impreso
We compute the relevant parameters of the combined Higgs and phi scalar effective potential in the littlest Higgs (LH) model. These parameters are obtained as the sum of two kinds of contributions. The first one is the one-loop radiative correct[...]texto impreso
In this work we study the chiral phase transition as observed by an accelerating observer taking into account the Unruh effect. We use chiral perturbation theory at leading order and the large N limit (N being the number of pions) as an effectiv[...]texto impreso
Delgado López, Rafael ; Dobado González, Antonio ; Llanes Estrada, Felipe José | Amer Physical Soc | 2015-04-27If the electroweak symmetry breaking sector turns out to be strongly interacting, the actively investigated effective theory for longitudinal gauge bosons plus Higgs can be efficiently extended to cover the regime of saturation of unitarity (whe[...]texto impreso
The direct chiral perturbation theory (ChPT) one-loop prediction for the production of two pions from two photons is compared with the recent Crystal Ball experimental data. The one-loop computation does not fit data even close to threshold beca[...]texto impreso
texto impreso
texto impreso
We report a calculation of the shear viscosity in a relativistic multicomponent meson gas as a function of temperature and chemical potentials. We approximately solve the Uehling-Uhlenbeck transport equation of kinetic theory, appropriate for a [...]texto impreso
texto impreso
We study the possibilities of unraveling the underlying dynamics of the symmetry breaking sector through the scattering of longitudinal weak bosons in pp collisions. W^ +/- Z^0 channels are considered in the context of a general approach based o[...]