A5065663875- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Quantum Electrodynamics and Casimir Effect
- Advanced Thermodynamics and Statistical Mechanics
- High-pressure geophysics and materials
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Advanced Chemical Physics Studies
- Cold Atom Physics and Bose-Einstein Condensates
- Pulsars and Gravitational Waves Research
- Quantum Mechanics and Non-Hermitian Physics
- Quantum Mechanics and Applications
- Quantum Computing Algorithms and Architecture
- Quantum, superfluid, helium dynamics
- Crystallography and Radiation Phenomena
- Atomic and Subatomic Physics Research
- Statistical Mechanics and Entropy
- Fractal and DNA sequence analysis
- Spectroscopy and Quantum Chemical Studies
Federico Santa María Technical University
2017-2020
Goethe University Frankfurt
2011-2013
Deutsches Elektronen-Synchrotron DESY
2009-2011
Pontificia Universidad Católica de Chile
2004-2007
Universidad Católica del Norte
2006
Thermal leptogenesis explains the observed matter-antimatter asymmetry of universe in terms neutrino masses, consistent with oscillation experiments. We present a full quantum mechanical calculation generated lepton based on Kadanoff-Baym equations. Origin is departure statistical propagator heavy Majorana from equilibrium propagator, together $CP$ violating couplings. The calculated directly Green's functions without referring to ``number densities.'' A detailed comparison Boltzmann...
In many realizations of leptogenesis, heavy right-handed neutrinos play the main role in generation an imbalance between matter and antimatter early Universe. Hence, it is relevant to address quantitatively their dynamics a hot dense environment by taking into account various thermal aspects problem at hand. The strong washout regime offers interesting framework carry out calculations systematically reduce theoretical uncertainties. Indeed, any matter–antimatter asymmetry generated when...
We show from first principles the emergence of classical Boltzmann equations relativistic nonequilibrium quantum field theory as described by Kadanoff–Baym equations. Our method applies to a generic field, coupled collection background fields and sources, in homogeneous isotropic spacetime. The analysis is based on analytical solutions full equations, using WKB approximation. This contrast previous derivations kinetic that rely similar physical assumptions, but obtain approximate motion...
Abstract In this article we study the rare B-meson decay via two on-shell almost-degenerate Majorana Heavy Neutrinos, into charged leptons and pseudoscalar mesons ( $$B^{\pm } \rightarrow D^0 \ell ^{\pm }_1 }_2 \pi ^{\mp }$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mi>B</mml:mi> <mml:mo>±</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:mi>D</mml:mi> <mml:mn>0</mml:mn> <mml:msubsup> <mml:mi>ℓ</mml:mi> <mml:mn>1</mml:mn> </mml:msubsup>...
We discuss the stability of skyrmion solution in presence a finite isospin chemical potential μ. Solving numerically mass as function μ, we find critical value μc=222.8MeV where vanishes. compare exact numerical treatment with an analytical discussion based on special shape for profile due to Atiyah and Manton. The extension this ansatz μ works quite well μ<121MeV. Then, small values approach is valid, consider possibility having angular deformation skyrmionic profile, which possible This...
Using the Hamiltonian formulation, in terms of collective variables, we explore evolution different skyrmionic parameters as function isospin chemical potential ($μ$), such energy density, charge isoscalar radius and magnetic radius. We found that radii start to grow very fast for $μ\gtrsim 140$ MeV, suggesting occurrence a phase transition.
We present a new gauge fixing condition for the Weinberg–Salam electro-weak theory at finite temperature and density. After spontaneous symmetry breaking occurs, every unphysical term in Lagrangian is eliminated with our condition. A simple can be obtained where we identify propagators vertices. Some consequences are discussed, as gauge-dependent masses of fields Faddeev–Popov Lagrangian. obtaining quadratic terms, calculate exactly 1-loop effective potential identifying contribution...
A bstract Thermal leptogenesis, in the framework of standard model with three additional heavy Majorana neutrinos, provides an attractive scenario to explain observed baryon asymmetry universe. It is based on out-of-equilibrium decay neutrinos a thermal bath particles, which fully quantum field theoretical formalism obtained by solving Kadanoff-Baym equations. So far, leading two-loop contributions from leptons and Higgs particles are included, but not yet gauge corrections. These enter at...
A discussion of the stability self-gravitating Skyrmions, with a large winding number N, in Schwarzschild type metric, is presented for case where an isospin chemical potential introduced. It turns out that stabilizes behavior Skyrmion discussed previously literature. This analysis carried on framework variational approach using different ansatze radial profile Skyrmion. We found divergent size Skyrmion, associated to certain critical value μ c potential. At this point, mass vanishes....
We show how to compute the spectral function for a scalar theory in two different scenarios: one which disregards back-reaction i.e. response of environment external particle, and other where is considered. The calculation was performed using Kadanoff-Baym equation through Keldysh formalism. When neglected, equal equilibrium one, can be represented as Breit-Wigner distribution. introduced we observed damping thermal bath. Such behavior modifies rate particles created within This certainly...
In this letter we explore the dependence on gauge fixing condition of several quantities in U(1) Higgs model at finite temperature and chemical potential. We compute effective potential one loop level, using a that depends $μ$ which allows to decouple contributions different fields model. way get mass spectrum characterization phase transition, pointing out each case how these depend parameter $ξ$. When vanishes, agree with previous results if $ξ=0$. The problem is also analyzed from...
An elementary treatment of the Dirac equation in presence a three dimensional spherically symmetric delta potential is presented. We show how to calculate cross section using relativistic wave expansion method for one and two concentric potentials. compare our results with calculated Born approximation.