Examinar por departamento (eus.) "Fisika teorikoa eta zientziaren historia"
Now showing items 120 of 140

3Form Cosmology: Phantom Behaviour, Singularities and Interactions
(MDPI, 20180303)The latest cosmological observations by the Planck collaboration (and combined with others) are compatible with a phantomlike behaviour (w <1) for the dark energy equation of state that drives the current acceleration ... 
A continued fraction based approach for the Twophoton Quantum Rabi Model
(Nature Publishing, 20190311)We study the Two Photon Quantum Rabi Model by way of its spectral functions and survival probabilities. This approach allows numerical precision with large truncation numbers, and thus exploration of the spectral collapse. ... 
A DualSpecies BoseEinstein Condensate with Attractive Interspecies Interactions
(MDPI, 20200321)We report on the production of a 41 K 87 Rb dualspecies Bose–Einstein condensate with tunable interspecies interaction and we study the mixture in the attractive regime; i.e., for negative values of the interspecies ... 
A formalism based on moments for classical and quantum cosmology
(IOP Publishing LTD, 2015)We compare the classical and quantum description of systems with one degree of freedom with an effective formalism based on statistical moments. Within this formalism the similarities and differences between the classical ... 
A phenomenological exploration within Theoretical Cosmology: from the Early to the Late Universe.
(20181011)En esta tesis se han explorado posibles extensiones del Modelo Estándar de la Cosmología. Hemos obtenido las predicciones teóricas de los modelos considerados y sus principales características. Los resultados presentados ... 
Activating hidden metrological usefulness
(American Physical Society, 20200707)[EN] We consider bipartite entangled states that cannot outperform separable states in any linear interferometer. Then, we show that these states can still be more useful metrologically than separable states if several ... 
An analytic superfield formalism for tree superamplitudes in D=10 and D=11
(Springer, 20180516)Tree amplitudes of 10D supersymmetric YangMills theory (SYM) and 11D supergravity (SUGRA) are collected in multiparticle counterparts of analytic onshell superfields. These have essentially the same form as their chiral ... 
An anomaly in quantum phases induced by borders
(Nature, 20200424)The stationary behavior of a quantum system is determined by its Hamiltonian and its boundary conditions. All quantum phase transitions (QPT) reported previously were induced by changing the Hamiltonian. In a circular spin ... 
An Exact Approach to Elimination of Leakage in a Qubit Embedded in a Threelevel System
(Nature, 20190730)Leakage errors damage a qubit by coupling it to other levels. Over the years, several theoretical approaches to dealing with such errors have been developed based on perturbation arguments. Here we propose a different ... 
Anisotropic expansion and SNIa: An open issue
(Elsevier, 20150204)We review the appropriateness of using SNIa observations to detect potential signatures of anisotropic expansion in the Universe. We focus on Union2 and SNLS3 SNIa datasets and use the hemispherical comparison method to ... 
Anisotropic Inflation With Derivative Couplings
(American Physical Society, 20180529)We study anisotropic powerlaw inflationary solutions when the inflaton and its derivative couple to a vector field. This type of coupling is motivated by Dbrane inflationary models, in which the inflaton, and a vector ... 
Anomalous transport in second order hydrodynamics
(E. D. P Sciences, 2016)We study the nondissipative transport effects appearing at second order in the hydrodynamic expansion for a noninteracting gas of chiral fermions by using the partition function formalism. We discuss some features of the ... 
Azimuthal asymmetries of backtoback π±−(π0, η, π±) pairs in e+e− annihilation
(American Physical Society, 20191127)This work reports the first observation of azimuthal asymmetries around the thrust axis in e(+)e() annihilation of pairs of backtoback charged pions in one hemisphere, and pi(0) and eta mesons in the opposite hemisphere. ... 
Beamhelicity asymmetries for singlehadron production in semiinclusive deepinelastic scattering from unpolarized hydrogen and deuterium targets
(Elsevier, 20191010)A measurement of beamhelicity asymmetries for singlehadron production in deepinelastic scattering is presented. Data from the scattering of 27.6 GeV electrons and positrons off gaseous hydrogen and deuterium targets ... 
Black hole solutions in mimetic BornInfeld gravity
(Springer, 20180123)The vacuum, static, and spherically symmetric solutions in the mimetic BornInfeld gravity are studied. The mimetic BornInfeld gravity is a reformulation of the EddingtoninspiredBornInfeld (EiBI) model under the mimetic ... 
Black Holes, Cosmological Solutions, Future Singularities, and Their Thermodynamical Properties in Modified Gravity Theorie
(MDPI, 20120918)Along this review, we focus on the study of several properties of modified gravity theories, in particular on blackhole solutions and its comparison with those solutions in General Relativity, and on Friedmann–Lemaˆıtr ... 
Bound Entangled SingletLike States for Quantum Metrology
(American Physical Society, 20210510)Bipartite entangled quantum states with a positive partial transpose (PPT), i.e., PPT entangled states, are usually considered very weakly entangled. Since no pure entanglement can be distilled from them, they are also ... 
Calibrating Analytical Models for Semilocal Strings
(IOP Publishing, 2015)In this work we calibrate two different analytic models of semilocal strings by constraining the values of their free parameters. In order to do so, we use data obtained from the largest and most accurate field theory ... 
Characterization of (asymptotically) Kerr–de Sitterlike spacetimes at null infinity*
(IOP Publishing, 20160804)We investigate solutions(M, g) to Einstein's vacuum field equations with positive cosmological constant. which admit a smooth past null infinity J() a la Penrose and a Killing vector field whose associated MarsSimon ... 
Charge Screening in the Abelian Higgs Model
(Springer, 20210318)In the Abelian Higgs model electric (and magnetic) fields of external charges (and currents) are screened by the scalar field. In this contribution, complementing recent investigations of Ishihara and Ogawa, we present a ...