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Quintessence and the Underlying Particle Physics Theory
D. J. H. Chung, L. L. Everett, A. Riotto
At present we know nothing about the nature of the dark energy accounting for about 70% of the energy density of the Universe. One possibility is that the dark energy is provided b…
Inflation and the Theory of Cosmological Perturbations
Antonio Riotto
These lectures provide a pedagogical introduction to inflation and the theory of cosmological perturbations generated during inflation which are thought to be the origin of structu…
Second-Order Cosmological Perturbations from Inflation
V. Acquaviva, N. Bartolo, S. Matarrese +1
We present the first computation of the cosmological perturbations generated during inflation up to second order in deviations from the homogeneous background solution. Our results…
Supersymmetric Dark Matter and the Reheating Temperature of the Universe
N. Fornengo, A. Riotto, S. Scopel
Since the thermal history of the Universe is unknown before the epoch of primordial nucleosynthesis, the largest temperature of the radiation dominated phase (the reheating tempera…
Transdimensional physics and inflation
G. F. Giudice, E. W. Kolb, J. Lesgourgues +1
Within the framework of a five-dimensional brane world with a stabilized radion, we compute the cosmological perturbations generated during inflation and show that the perturbation…
Isocurvature perturbations in the Ekpyrotic universe
A. Notari, A. Riotto
The Ekpyrotic scenario assumes that our visible Universe is a boundary brane in a five-dimensional bulk and that the hot Big Bang occurs when a nearly supersymmetric five-brane tra…