Prof.
Andrei Linde
(Stanford University)
20/09/2016, 10:00
I will describe a large class of inflationary models, cosmological attractors, which can describe not only inflation, but also SUSY breaking and the cosmological constant. The simplest models of this class involve nilpotent chiral superfields. This allows to describe small SUSY breaking which does not lead to the infamous cosmological Polonyi field problem.
Dr
Martin Bucher
(APC Paris 7, CNRS and PLANCK)
20/09/2016, 10:50
Precise observations of the cosmic microwave background (CMB) have substantially narrowed the field of viable models for the early universe and for generating the seeds of large-scale structure. I will review the constraints imposed on models of inflation by current CMB observations and survey the future constraints to be anticipated, in particular through the search for B-mode polarization...
Prof.
Augusto Sagnotti
(SNS Pisa)
20/09/2016, 12:10
If Supersymmetry were realized in Nature, it ought to have been broken at a high scale during inflation. Indirect signs of this epoch have shown up in the results of the Planck satellite, which have provided evidence for a non-trivial CMB spectral tilt ns<1. I elaborate on models on "brane supersymmetry breaking", a peculiar and natural mechanism drawn from String Theory, to investigate...
Dr
Alexander Westphal
(DESY)
20/09/2016, 15:00
We present an analytic method for calculating the transition probability between two random Gaussian matrices with given eigenvalue spectra in the context of Dyson Brownian motion. We show that in the Coulomb gas language, in large N limit, memory of the initial state is preserved in the form of a universal linear potential acting on the eigenvalues. We compute the likelihood of any given...
Prof.
Renata Kallosh
(Stanford University)
20/09/2016, 15:50
We will discuss inflationary models compatible with the data, based on nonlinear realization of supersymmetry, as suggested by D3 brane physics of string theory. Relation to recent progress in understanding of soft limits of amplitudes in models with nonlinear symmetry will be presented.
Dr
Giancarlo Cella
(Pisa U., INFN and VIRGO)
20/09/2016, 17:10
A stochastic background of gravitational waves can be described as a superposition of several
uncorrelated contributions. It can be of both cosmological and astrophysical origin. In the first
case, it can constitute potentially a unique probe of the primordial universe. In the second, it can
give precious information on stellar populations. After discussing how this kind of signal can be...
