Documents de présentation
According to standard inflationary theories, the origin of cosmological structures is explained by a period of exponential expansion of the Universe induced by the potential of a scalar field and its quantum fluctuations. In addition to these primordial densities, inflation also predicts the existence of a primordial gravitational waves background. The imprint of which would be visible on the...
The first gravitational waves signal was detected on the 14th september 2015 by the LIGO observatories. Since then many other detections have been made and especially in August 2017 with the detection in coincidence on both LIGO and Virgo detectors of the coalescence of two neutron stars which position in the sky was precise enough to identify the galaxy host and electromagnetic counterpart....
One of the major scientific objectives of the future Cherenkov Telescope Array (CTA) Observatory is the discovery of PeVatrons, which are able to accelerate charged particle up to 1 PeV (10^15 eV). The determination of efficient criteria to identify PeVatron candidates during the observations is essential in order to trigger deeper observations. Here we use the simulated data, which call Data...
Cosmic strings are topological defects which can be formed in GUT-scale phase transitions in
the early universe. They are also predicted to form in the context of string theory. I will present the analysis conducted to specifically search for gravitational-wave bursts from cosmic string loops in the data of Advanced LIGO 2015-2016 observing run (O1).
