IFIMAR 20926
INSTITUTO DE INVESTIGACIONES FISICAS DE MAR DEL PLATA
Unidad Ejecutora - UE
artículos
Título:
Spherical and non-spherical bubbles in cosmological phase transitions
Autor/es:
LEONARDO LEITAO; ARIEL MÉGEVAND
Revista:
NUCLEAR PHYSICS B
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2010
ISSN:
0550-3213
Resumen:
The cosmological remnants of a first-order phase transition generally
depend on the perturbations that the walls of expanding bubbles
originate in the plasma. Several of the formation mechanisms occur when
bubbles collide and lose their spherical symmetry. However, spherical
bubbles are often considered in the literature, in particular for the
calculation of gravitational waves. We study the steady state motion of
bubble walls for different bubble symmetries. Using the bag equation of
state, we discuss the propagation of phase transition fronts as
detonations and subsonic or supersonic deflagrations. We consider the
cases of spherical, cylindrical and planar walls, and compare the energy
transferred to bulk motions of the relativistic fluid. We find that the
different wall geometries give similar perturbations of the plasma. For
the case of planar walls, we obtain analytical expressions for the
kinetic energy in the bulk motions. As an application, we discuss the
generation of gravitational waves.
