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Akademický článek
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Autor:
Mariani, R. D.1, Rosati, F. C.1 f.rosati@economia.uniroma2.it
Publikováno v:
Journal of Demographic Economics. Dec2022, Vol. 88 Issue 4, p503-533. 31p.
In Scalar-Tensor theories of gravity, the expansion rate of the universe in the past may differ considerably from the standard one. After imposing the constraints coming from nucleosynthesis, CMB, type Ia supernovae, and solar system tests of General
Externí odkaz:
http://arxiv.org/abs/astro-ph/0406152
Publikováno v:
Phys.Rev.D70:063519,2004
Scalar-tensor theories of gravity provide a consistent framework to accommodate an ultra-light quintessence scalar field. While the equivalence principle is respected by construction, deviations from General Relativity and standard cosmology may show
Externí odkaz:
http://arxiv.org/abs/astro-ph/0403614
Autor:
Rosati, F.
Publikováno v:
Phys.Lett. B570 (2003) 5-10
The presence of a dynamical scalar field in the early universe could significantly affect the `freeze-out' time of particle species. In particular, it was recently shown that an enhancement of the relic abundance of neutralinos can be produced in thi
Externí odkaz:
http://arxiv.org/abs/hep-ph/0302159
Autor:
Rosati, F.
Publikováno v:
Proceedings of the XVIII IAP Colloquium `On the nature of dark energy', Frontier Group (2002), p.297. Edited by Ph. Brax, J. Martin, J.Ph. Uzan
Results of a general study on the dynamics of cosmological scalar fields with arbitrary potentials are presented. Exact and approximate attractor solutions are found, with applications to quintessence, moduli stabilization and inflation.
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Externí odkaz:
http://arxiv.org/abs/astro-ph/0210445
Publikováno v:
Phys.Rev.D64:083510,2001
We develop a framework to study the phase space of a system consisting of a scalar field rolling down an arbitrary potential with varying slope and a background fluid, in a cosmological setting. We give analytical approximate solutions of the field e
Externí odkaz:
http://arxiv.org/abs/astro-ph/0107321
Publikováno v:
Eur. Phys. J. B 21, 605-609 (2001)
A renormalization group transformation suitable for spin glass models and, more generally, for disordered models, is presented. The procedure is non-standard in both the nature of the additional interactions and the coarse graining transformation, th
Externí odkaz:
http://arxiv.org/abs/cond-mat/0101038
Publikováno v:
Phys.Rev. D62 (2000) 123503
Scalar field models of quintessence typically require that the expectation value of the field today is of order the Planck mass, if we want them to explain the observed acceleration of the Universe. This suggests that we should be considering models
Externí odkaz:
http://arxiv.org/abs/hep-ph/0005222
Akademický článek
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