As our Universe has expanded and cooled, it is suspected that it has
undergone different phase transitions. In particular, first order
cosmological phase transitions provide a compelling source of
Gravitational Waves (GWs) and this is particularly interesting in the
context of the Laser Interferometer Space Antenna
LISA. In
a recent publication, Pierre and his
collaborators proposed a new accurate semi-analytical model for
predicting the GW signal generated by a turbulent phase in the
aftermath of a first order phase transition.
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The next cosmology seminar takes place on Thursday 19th of
May, seminar room E349 at 11am. Our guest speaker will be
Hugo Roussille from APC (Paris, France).
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The next cosmology seminar takes place on Thursday 7th of
April, seminar room E349 at 11am. Our guest speaker will be
Fabien Lacasa from the Institut d’Astrophysique Spatiale (Orsay,
France).
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Traditionally the problem of initial conditions for inflation has been
treated separately from studies of reheating. To allow for a
parametric-type reheating, the inflaton must be allowed to interact
with (or decay to) other fields, and, these interactions should be
present also during inhomogeneous preinflation. Could they prevent
cosmic inflation to start in the first place? In a single-author
publication Cristian answers this question
for Higgs Inflation: once more, inflation always starts and passes the
challenge!
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Our next cosmology seminar takes place on Wednesday 1st of December,
seminar room E349 at 2pm. The speaker is Maxence Corman
from the Perimeter Institute (Waterloo, Canada).
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