Conveners
Parallel Track 3
- Julien Serreau (Université Paris Diderot)
Parallel Track 3
- Mikko Sakari Laine (Universitaet Bern (CH))
Parallel Track 3
- Gert Aarts (Swansea University)
Parallel Track 3
- Andreas Schmitt (University of Southampton)
We thoroughly investigated the applicability of the two-particle irreducible
(2PI) formalism in the description of phase transitions occurring at finite temperature in scalar field theories. We studied the importance of truncation effects on the order of the phase transition and indeed found that the long known problem of the Hartree-Fock truncation is cured by improving the approximation to...
The dynamics of inhomogeneous quantum fields out of equilibrium are especially relevant for the study of first-order phase transitions. It is our aim to calculate how critical bubbles of the new phase -that form in such a process- propagate for different quantum field theories. The Electroweak phase transition in the early universe is of particular interest, since Baryogenesis can potentially...
In the study of phase transitions in the early universe, methods based on $N$ particle irreducible effective actions have become very important for describing the out of equilibrium dynamics of these phenomena. Equations of motion for classical 1-, up to $N$-point functions can be obtained from stationarity conditions. However, in order to extract physical information, the action must first be...
Previous calculations have shown that the 2 particle irreducible (2pi) effective theory is a promising method to study strongly coupled systems, for which non-perturbative techniques are needed. Calculations at the 3 loop level show improved convergence, relative to perturbative results. We present results in \phi^4 theory at the 4 loop level which show that convergence breaks down at large...
I will summarize a recent estimation (arXiv:1605.07720) of the thermal masses and damping rates of active (m < eV) and sterile (M ∼ GeV)
neutrinos with thermal momenta k ∼ 3T at temperatures below the electroweak crossover
(5 GeV < T < 160 GeV). These quantities in turn fix the washout rates of Standard
Model lepton number densities and the thermal production rate of sterile neutrinos....
The origin of the baryon asymmetry in the Universe (BAU) is a big mystery in particle physics and cosmology. One interesting scenario to explain BAU is the resonant leptogenesis which admits lepton number creation in the electroweak-scale, and therefore, receives lots of phenomenological interests in the LHC era. Then, the decay of right-handed neutrinos which causes the lepton number must be...
Explaining the matter-antimatter asymmetry of the Universe remains one of the most intriguing problems in particle physics and cosmology. A popular class of theories attributes this asymmetry to CP-violating decays of super-heavy particles in the Early Universe. We present a new source of baryogenesis within these models, and show how the same Yukawa phases which provide the CP-violation for...
We consider the dynamics of the standard model extended by two or more right
handed neutrinos, which simultaneously explains the origin of neutrino masses
through the seesaw mechanism and the baryon asymmetry of the universe
through leptogenesis.
Specifically, we focus on right handed neutrinos with GeV scale mass which can
be found in collider or fixed target experiments.
We use quantum...
We use the functional renormalization group (FRG) technique to explore the characteristics of the chiral phase transition between the hadronic phase of quantum chromodynamics and the quark-gluon plasma. The restoration of chiral symmetry at high temperatures and/or net-baryon densities leads to changes in the in-medium spectral properties of light vector mesons, directly affecting the dilepton...
We will present recent results regarding chiral symmetry restoration and other hadronic properties at finite temperature. In particular, we will discuss the interpretation of the temperature dependence of lattice screening masses through Ward identities relating pseudoscalar susceptibilities and quark condensates. Such identities are derived for two and three flavours and studied within the...
We study a Random Matrix Model for QCD at finite density via Complex Langevin dynamics. This model has a phase transition to a phase with non-zero baryon density. We study the convergence of the algorithm as a function of the quark mass and the chemical potential and focus on two main observables: the baryon density and the chiral condensate. As expected, for simulations close to the chiral...
In this work we consider the ontological status of the Unruh effect. Is it just a formal mathematical result? Or the temperature detected by an accelerating observer can lead to real physical effects such as phase transitions? In order to clarify this issue we use the Thermalization Theorem to explore the possibility of having a restoration of the symmetry in a system with spontaneous...
A power expansion scheme is set up to determine the Wigner function that satisfies the quantum kinetic equation for spin-1/2 charged fermions in a background electromagnetic field. Vector and axial-vector current induced by magnetic field and vorticity are obtained simultaneously from the Wigner function. The chiral magnetic and vortical effect and chiral anomaly are shown as natural...
The chiral magnetic effect has attracted much interest in various areas of physics from condensed matter physics to nuclear and particle physics.
In condensed matter physics it has actively investigated in the so called Weyl (semi-)metals in which Weyl fermions are realized as points of band touching with definite topological character.
The chiral magnetic effect arises only in...
Superfluid vortices in the color-flavor-locked (CFL) phase of dense quark
matter are known to be energetically disfavored relative to well-separated
triplets of so-called semi-superfluid color flux tubes. In this talk we will
present results from our numerical stability analysis of superfluid vortices
in dense quark matter. After identifying (physical) regions of...
