1,655 research outputs found
Can CP-violation be observed in heavy-ion collisions?
We demonstrate that, at least at present, there is no convincing way to
detect CP-violation in heavy-ion collisions.Comment: 3 pages, 1 figure; reference added, misprint correcte
Evolution of thick domain walls in inflationary and universe
We study the evolution of thick domain walls in the different models of
cosmological inflation, in the matter-dominated and radiation-dominated
universe, or more generally in the universe with the equation of state
. We have found that the domain wall evolution crucially depends on
the time-dependent parameter , where is the
Hubble parameter and is the thickness of the wall in flat
space-time. For the physical thickness of the wall, ,
tends with time to , which is microscopically small. Otherwise, when
, the wall steadily expands and can grow up to a cosmologically
large size.Comment: 15 pages, 9 figure
Shape of the inflaton potential and the efficiency of the universe heating
It is shown that the efficiency of the universe heating by an inflaton field
depends not only on the possible presence of parametric resonance in the
production of scalar particles but also strongly depends on the character of
the inflaton approach to its mechanical equilibrium point. In particular, when
the inflaton oscillations deviate from pure harmonic ones toward a succession
of step functions, the production probability rises by several orders of
magnitude. This in turn leads to a much higher temperature of the universe
after the inflaton decay, in comparison to the harmonic case. An example of the
inflaton potential is presented which creates a proper modification of the
evolution of the inflaton toward equilibrium and does not destroy the nice
features of inflation.Comment: 14 pages, 12 figures; final version published in EPJ
Upper limits on electric dipole moments of tau-lepton, heavy quarks, and W-boson
We discuss upper limits on the electric dipole moments (EDM) of the
tau-lepton, heavy quarks, and W-boson, which follow from the precision
measurements of the electron and neutron EDM.Comment: 8 pages, 7 figures; misprint corrected, results do not chang
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