Cosmology Seminar
The next cosmology seminar takes place on Friday 30th of September, seminar room E349 at 2pm. Our guest speaker will be Nilanjandev Bhaumik from the Indian Institute of Science (Bangalore, India).
More …Slow-roll Inflation at N3LO
Cosmic Inflation, the most favoured scenario of the early Universe, implies that all forms of matter and radiation observed today are the outcome of quantum fluctuations occurring around the event horizon of a exponentially fast accelerating space-time. Clearing the ground for the incoming spatial and ground based cosmological observations, Pierre and Christophe have derived, at an unprecedented level of precision, the shape of the expected power spectra of both the quantum-generated gravitational waves and curvature perturbations.
More …BEL Center exhibition
Anticipating the opening of the Brout-Englert-Lemaître Center, a few aesthetic pictures associated with our researches will be on display during the “Walk in the Park” event, on Saturday the 25th at the Tournay Solvay Park (11am).
More …Stochastic gravitational waves from long cosmic strings
A cosmic strings network present in our Universe should be incessantly emitting gravitational waves. An absolute lower limit of the expected signal can be found by determining the gravitational waves created by the back bones of the network: the long cosmic strings. Disrael and Christophe, in collaboration with François R. Bouchet, have computed this irreducible contribution using new numerical simulations of Nambu-Goto cosmic strings.
More …Gravitational waves from freely decaying turbulence
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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