4,295 research outputs found
Energy density fluctuations in Early Universe
The primordial nucleosinthesys of the element can be influenced by the
transitions of phase that take place after the Big Bang, such as the QCD
transition. In order to study the effect of this phase transition, in this work
we compute the time evolution of thermodynamical quantities of the early
universe, focusing on temperature and energy density fluctuations, by solving
the relevant equations of motion using as input the lattice QCD equation of
state to describe the strongly interacting matter in the early universe plasma.
We also study the effect of a primordial strong magnetic field by means of a
phenomenological equation of state. Our results show that small inhomogeneities
of strongly interacting matter in the early Universe are moderately damped
during the crossover.Comment: 4 pages, 2 figures. Talk given at Sventh European Summer School on
Experimental Nuclear Astrophysics, 15-27 September 2013, Santa Tecla (CT) -
Ital
Meissner masses in the gCFL phase of QCD
We calculate the Meissner masses of gluons in neutral three-flavor color
superconducting matter for finite strange quark mass. In the CFL phase the
eissner masses are slowly varying function of the strange quark mass. For large
strange quark mass, in the so called gCFL phase, the Meissner masses of gluons
with colors and 8 become imaginary, indicating an instability.Comment: New Fig. 1 shows that also the masses of the gluons 3 and 8 are
imaginar
Enforced neutrality and color-flavor unlocking in the three-flavor Polyakov-loop NJL model
We study how the charge neutrality affects the phase structure of
three-flavor PNJL model. We point out that, within the conventional PNJL model
at finite density the color neutrality is missing because the Wilson line
serves as an external ``colored'' field coupled to dynamical quarks. In this
paper we heuristically assume that the model may still be applicable. To get
color neutrality one has then to allow non vanishing color chemical potentials.
We study how the quark matter phase diagram in -plane is
affected by imposing neutrality and by including the Polyakov loop dynamics.
Although these two effects are correlated in a nonlinear way, the impact of the
Polyakov loop turns out to be significant in the direction, while imposing
neutrality brings a remarkable effect in the direction. In
particular, we find a novel unlocking transition, when the temperature is
increased, even in the chiral SU(3) limit. We clarify how and why this is
possible once the dynamics of the colored Polyakov loop is taken into account.
Also we succeed in giving an analytic expression for for the transition
from two-flavor pairing (2SC) to unpaired quark matter in the presence of the
Polyakov loop.Comment: 11 pages, REVTex4, 10 eps figures; v2: added two notes, added a
reference; version to appear in Phys. Rev.
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