Dr
Scott Robertson
(LPT Orsay)
16/01/2015 14:25
Hawking radiation, despite being known to theoretical physics for 40 years, remains an elusive phenomenon. It also suffers, in its original context of gravitational black holes, from practical and conceptual difficulties. In order to gain better theoretical understanding and, it is hoped, experimental verification of Hawking radiation, much study is being devoted to laboratory systems which...
Prof.
Pascal Chardonnet
(Université de Savoie/LAPTH)
16/01/2015 14:39
According to theoretical models, massive stars with masses within the 100- 250 solar mass range should explode as pair-instability supernovae (PISNe). Since the first stars of the Universe are believed to be very massive, these supernovae should play a signicant role in the early stages of its history. But these stars represent the last unobserved population, owing to detection limits of...
Dr
Paolo Panci
(Institut d'Astrophysique de Paris)
16/01/2015 14:53
M.
Mathieu Boudaud
(LAPTh)
16/01/2015 15:07
The positron fraction in cosmic rays has been recently measured with
improved accuracy up to 500 GeV by the space-borne experiment AMS-02, and
it was found to be a steadily increasing function of energy, above 10 GeV.
This behaviour is in tension with standard astrophysical mechanisms, in
which positrons are secondary particles, produced in the interactions of
primary cosmic rays during...
M.
Stefano Magni
(Université Montpellier 2)
16/01/2015 15:21
The knowledge of the high velocity tail of the WIMP velocity distribution function has a strong impact on the way direct detection (DD) may constrain or discover light WIMPs in the GeV mass range. Recently, there have been important observational efforts to estimate the so-called Galactic escape speed at the position of the Earth, like for instance the analysis published in early 2014 by the...
