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Amer Physical Soc |
Documentos disponibles de esta editorial (185)
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Peropadre, B. ; Zueco, D. ; Porras Torres, Diego ; Garc?´a-Ripoll, J. J. | Amer Physical Soc | 2013-12-09The time and space resolved dynamics of a qubit with an Ohmic coupling to propagating 1D photons is studied, from weak coupling to the ultrastrong coupling regime. A nonperturbative study based on matrix product states shows the following result[...]![]()
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Gómez Nicola, Ángel ; Peláez Sagredo, José Ramón ; Ruiz de Elvira, Jacobo | Amer Physical Soc | 2010-10-14Four-quark correlators and the factorization hypothesis are analyzed in the meson sector within chiral perturbation theory. We define the four-quark condensate as lim(x -> 0) , which is equivalent to ot[...]![]()
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We compute the spectrum, mixing and interaction structure of scalar models with a general coupling to the scalar curvature. As it is well known the perturbative states of these theories are given by two massive spin-0 modes in addition to one ma[...]![]()
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Misner space is generalized to have the nonorientable topology of a Klein bottle, and it is shown that, in a classical spacetime with multiply connected space slices having such a topology, closed timelike curves are formed. Different regions on[...]![]()
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We propose a new mechanism for the formation of dark matter clumps in the radiation era. We assume that a light scalar field is decoupled from matter and oscillates harmonically around its vacuum expectation value. We include self-interactions a[...]![]()
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We study static, spherically symmetric black holes supported by the Euler-Heisenberg theory of electrodynamics and coupled to two different modified theories of gravity. Such theories are the quadratic f (R) model and Eddington-inspired Born-Inf[...]![]()
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The symmetries of unimodular gravity are clarified somewhat.![]()
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Teo, Yong Siah ; Struchalin, G. I. ; Kovlakov, E. V. ; Ahn, Daekun ; Jeong, Hyunseok ; Straupe, S. S. ; Kulik, S. P. ; Leuchs, Gerd ; Sánchez Soto, Luis Lorenzo | Amer Physical Soc | 2020-02-01We present a compressive quantum process tomography scheme that fully characterizes any rank-deficient completely positive process with no spurious a priori information. It uses randomly chosen input states and adaptive output von Neumann measur[...]![]()
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A previous work about inclusive proton decay in a nucleus is critically analyzed. Explicit new calculations are carried out in the deuteron, which turn out to be consistent with previous evaluations by other authors. By relating the inclusive de[...]![]()
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Pachón, Leonardo A. ; Relaño Pérez, Armando ; Peropadre, Borja ; Aspuru-Guzik, Alán | Amer Physical Soc | 2018-10-19Based on the connection between the spectral form factor and the probability to return, the origin of the energy level fluctuation 1/f(alpha) noise in fully chaotic and fully integrable systems is traced to the quantum interference between invar[...]![]()
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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[...]![]()
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Garay Elizondo, Luis Javier ; Halliwel, Jonathan J. ; Mena Marugán, Guillermo A. | Amer Physical Soc | 1991-04-15We study a class of minisuperspace models consisting of a homogenous isotropic universe with a minimally coupled homogenous scalar field with a potential alpha cosh(2-phi) + beta sinh(2-phi), where alpha and beta are arbitrary parameters. This i[...]![]()
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We present and analyze a new set of Ward Identities which shed light on the distinction between different patterns of chiral symmetry restoration in QCD, namely O(4) vs O(4) x U(1)_A. The degeneracy of chiral partners for all scalar and pseudosc[...]![]()
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%'e compute the divergent part of the three-point vertex function of the non-Abelian Yang-Mills gauge field theory within the stochastic quantization approach to the one-loop order. This calculation allows us to find four renormalization constan[...]![]()
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Alonso, J.L. ; Boucaud, Ph. ; Martín Mayor, Víctor ; van der Sijs, A.J. | Amer Physical Soc | 2000-02-01The phase diagram at zero temperature of a lattice SU(2) scalar-fermion model in 211 dimensions is studied numerically and with mean-field methods. Special attention is devoted to the strong coupling regime. We have developed a new method to ada[...]![]()
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Blázquez Salcedo, José Luis ; González Romero, Luis Manuel ; Navarro Lérida, Francisco | Amer Physical Soc | 2013-05-31Here we investigate the axial w quasinormal modes of neutron stars for 18 realistic equations of state, most of them satisfying the 2M condition. In particular, we study the influence of the presence of hyperons and quarks in the core of the ne[...]![]()
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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[...]![]()
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In this work we provide simple and precise parametrizations of the existing ?K scattering data from threshold up to 1.6 GeV, which are constrained to satisfy forward dispersion relations as well as three additional threshold sum rules. We also p[...]![]()
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We improve, in the energy region between the K?K threshold and ~ 1.4 GeV, the energy-dependent phase shift analysis of ? ? scattering presented in a previous paper. For the S0 wave, we have included more data above the K?K threshold and we hav[...]![]()
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We complete and improve the fits to experimental ? ? scattering amplitudes, both at low and high energies, that we performed in the previous papers of this series. We then verify that the corresponding amplitudes satisfy analyticity requirements[...]![]()
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Garcia-Martin, R. ; Kami?ski, Robert ; Peláez Sagredo, José Ramón ; Ruiz de Elvira, Jacobo ; Yndurain, F.J. | Amer Physical Soc | 2011-04-04We improve our description of ? ? scattering data by imposing additional requirements on our previous fits, in the form of once-subtracted Roy-like equations, while extending our analysis up to 1100 MeV. We provide simple and ready to use parame[...]![]()
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Using unitarized chiral perturbation theory methods, we perform a detailed analysis of the ? ? scattering poles f_0(600) and ?(770) behavior when medium effects such as temperature or density drive the system towards chiral symmetry restoration.[...]![]()
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Blázquez Salcedo, José Luis ; González Romero, Luis Manuel ; Navarro Lérida, F. | Amer Physical Soc | 2014-02-06In this paper, we analyze the quasinormal mode spectrum of realistic neutron stars by studying the polar modes. In particular, we calculate the fundamental mode (f mode), the fundamental pressure mode (p mode), and the fundamental curvature mode[...]![]()
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We calculate the combination 2a?_(0)-5a?(^2) (the Olsson sum rule) and the scattering lengths and effective ranges a?,a?^(2) and b?,b?^(I) dispersively (with the Froissart-Gribov representation) using, at low energy, the phase shifts for ? ? sca[...]![]()
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Arqueros Martínez, Fernando ; Blanco Ramos, Francisco ; García Pinto, Diego ; Minaya Flores, Ignacio Andrés ; Ortiz Ramis, Montserrat ; Rosado Vélez, Jaime ; Vázquez Peñas, José Ramón | Amer Physical Soc | 2014-03-14The emission of radio waves from air showers has been attributed to the so-called geomagnetic emission process. At frequencies around 50 MHz this process leads to coherent radiation which can be observed with rather simple setups. The direction [...]![]()
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Balanced homodyning, heterodyning, and unbalanced homodyning are three well-known sampling techniques used in quantum optics to characterize photonic sources in the continuous-variable regime. We show that for all quantum states and all observab[...]![]()
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Croccolo, Fabrizio ; García Fernández, Loreto ; Bataller, Henri ; Vailati, Alberto ; Ortiz de Zarate, José María | Amer Physical Soc | 2019-01-03Nonequilibrium temperature and concentration fluctuations inside a binary liquid mixture under the action of a temperature gradient relax back to equilibrium either due to conduction and diffusion at large wave numbers, or due to the quenching d[...]![]()
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Fernández Pérez, Luis Antonio ; Muñoz Sudupe, Antonio ; Ruiz Lorenzo, J. J. | Amer Physical Soc | 1994-11-01We propose a new real space renormalization group transformation useful for Monte Carlo calculations in theories with global or local symmetries. From relaxation arguments we de6ne the block-spin transformation with two tunable free parameters, [...]![]()
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Fernández Pérez, Luis Antonio ; Fernández Álvarez-Estrada, Ramón ; Sánchez Gómez, J. L. | Amer Physical Soc | 1983In this paper, proton decay in a large nucleus is studied in the framework of SU(5) grand unification theory (GUT). By using a method based upon the Green s-function technique of many-body physics, nuclear effects on spectator and pole terms are[...]![]()
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Bouhmadi Lopez, M. ; Garay Elizondo, Luis Javier ; González Díaz, Pedro F. | Amer Physical Soc | 2002-09-15We study the quantum vacuum fluctuations around closed Friedmann-Robertson-Walker (FRW) radiation-filled universes with a nonvanishing cosmological constant. These vacuum fluctuations are represented by a conformally coupled massive scalar field[...]![]()
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Martin Martinez, Eduardo ; Garay Elizondo, Luis Javier ; León, Juan | Amer Physical Soc | 2010-09-22A field in the vacuum state, which is in principle separable, can evolve to an entangled state in a dynamical gravitational collapse. We will study, quantify, and discuss the origin of this entanglement, showing that it could even reach the maxi[...]![]()
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The properties of the vacuum are described by quantum physics including the response to external fields such as electromagnetic radiation. Of the two parameters that govern the details of the electromagnetic field dynamics in vacuum, one is fixe[...]![]()
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We study the effects of asymptotically anti-de Sitter wormholes in low-energy field theory and give a general prescription for obtaining the local effective interaction terms induced by them. The choice of vacuum for the matter fields selects a [...]![]()
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Manzano, Gonzalo ; Horowitz, Jordan M ; Rodríguez Parrondo, Juan Manuel | Amer Physical Soc | 2018-08-06We analyze the production of entropy along nonequilibrium processes in quantum systems coupled to generic environments. First, we show that the entropy production due to final measurements and the loss of correlations obeys a fluctuation theorem[...]![]()
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The quantum state of a wormhole can be represented by a path integral over all asymptotically Euclidean four-geometries and all matter fields which have prescribed values, the arguments of the wave function, on a three-surface S which divides th[...]![]()
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Galan, Pablo ; Garay Elizondo, Luis Javier ; Mena Marugán, Guillermo A. | Amer Physical Soc | 2007-08The combined action of gravity and quantum mechanics gives rise to a minimum time uncertainty in the lowest order approximation of a perturbative scheme, in which quantum effects are regarded as corrections to the classical spacetime geometry. F[...]![]()
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We perform a quasinormal mode analysis of black-hole configurations in Bose-Einstein condensates (BECs). In this analysis we use the full Bogoliubov dispersion relation, not just the hydrodynamic or geometric approximation. We restrict our atten[...]![]()
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Valtierra, Iván F. ; Klimov, A.B. ; Leuchs, Gerd ; Sánchez Soto, Luis Lorenzo | Amer Physical Soc | 2020-03-02We present analytic expressions for the s-parametrized currents on the sphere for both unitary and dissipative evolutions. We examine the spatial distribution of the flow generated by these currents for quadratic Hamiltonians. The results are ap[...]![]()
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Blázquez Salcedo, José Luis ; Kunz, Jutta ; Navarro Lérida, Francisco ; Radu, Eugen | Amer Physical Soc | 2015-08-17Rotating black holes in Einstein-Maxwell-Chern-Simons theory possess remarkable features when the Chern-Simons coupling constant reaches a critical value. Representing single asymptotically flat black holes with horizons of spherical topology, t[...]![]()
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Jarillo, Javier ; García Villaluenga, Juan Pedro ; Cao García, Francisco Javier | Amer Physical Soc | 2018-09-04Brownian ratchets are small-scale systems which rectify thermal fluctuations to produce a net current of particles. They have inspired many models of molecular motors that perform transport in the noisy environment of living cells. For the most [...]![]()
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Castaño Tierno, Antonio ; Mohino Harris, Elsa ; Rodríguez Fonseca, María Belén ; Losada Doval, Teresa | Amer Physical Soc | 2018-12-16The thermocline is defined as the ocean layer for which the vertical thermal gradient is maximum. In the equatorial ocean, observations led to the use of the 20 °C isotherm depth (z20) as an estimate of the thermocline. This study compares z20 a[...]![]()
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In the framework of general relativity, a description of the matching conditions between two rotating perfect fluids spacetimes in terms of the kinematical properties of the fluids is introduced. The Einstein and Darmois equations are written us[...]![]()
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Gómez Nicola, Ángel ; Peláez Sagredo, José Ramón ; Ruiz de Elvira, Jacobo | Amer Physical Soc | 2013-01-02We analyze the properties of four-quark condensates and scalar susceptibilities in the meson gas, within finite temperature chiral perturbation theory (ChPT). The breaking of the factorization hypothesis does not allow for a finite four-quark co[...]![]()
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The imaginary time generating functional Z for the assless Schwinger model at nonzero chemical potential mu and temperature T is studied in a torus with spatial length L. The lack of Hermiticity of the Dirac operator gives rise to a nontrivial [...]![]()
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Arganda, E. ; Arqueros Martínez, Fernando ; Blanco Ramos, Francisco ; García Pinto, Diego ; Ortiz Ramis, Montserrat ; Rosado Vélez, Jaime ; Vázquez Peñas, José Ramón | Amer Physical Soc | 2011-12-30The Surface Detector of the Pierre Auger Observatory is sensitive to neutrinos of all flavors above 0.1 EeV. These interact through charged and neutral currents in the atmosphere giving rise to extensive air showers. When interacting deeply in t[...]![]()
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Arqueros Martínez, Fernando ; García Pinto, Diego ; Minaya Flores, Ignacio Andrés ; Vázquez Peñas, José Ramón | Amer Physical Soc | 2016-10-03We present a search for ultrarelativistic magnetic monopoles with the Pierre Auger observatory. Such particles, possibly a relic of phase transitions in the early Universe, would deposit a large amount of energy along their path through the atmo[...]![]()
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We analyze the Hawking radiation process due to collapsing configurations in the presence of superluminal modifications of the dispersion relation. With such superluminal dispersion relations, the horizon effectively becomes a frequency-dependen[...]![]()
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Coulomb-excitation experiments to study electromagnetic properties of radioactive even-even Hg isotopes were performed with 2.85 MeV=nucleon mercury beams from REX-ISOLDE. Magnitudes and relative signs of the reduced E2 matrix elements that coup[...]![]()
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The beta decay of Pb-192,Pb-190 has been studied using the total absorption technique at the ISOLDE (CERN) facility. The beta-decay strength deduced from the measurements, combined with QRPA theoretical calculations, allow us to infer that the g[...]![]()
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Chinea Trujillo, Francisco Javier ; Fernández Jambrina, Leonardo ; Senovilla, J. M. M. | Amer Physical Soc | 1992-01-15We show that the solution published in the paper by Senovilla [Phys. Rev. Lett. 64, 2219 (1990)] is geodesically complete and singularity-free. We also prove that the solution satisfies the stronger energy and causality conditions, such as globa[...]