Zobrazeno 1 - 10
of 31
pro vyhledávání: '"Hall, Lisa M. H."'
Publikováno v:
Phys.Rev.D79:103508,2009
In models of coupled dark energy, in which a dark energy scalar field couples to other matter components, it is natural to expect a coupling to the inflaton as well. We explore the consequences of such a coupling in the context of single field slow-r
Externí odkaz:
http://arxiv.org/abs/0812.2843
Publikováno v:
JCAP 0902:017,2009
We study the generation of non-Gaussianity in models of hybrid inflation with two inflaton fields, (2-brid inflation). We analyse the region in the parameter and the initial condition space where a large non-Gaussianity may be generated during slow-r
Externí odkaz:
http://arxiv.org/abs/0812.0807
Publikováno v:
JCAP 0810:008,2008
We study the level of primordial non-Gaussianity in slow-roll two-field inflation. Using an analytic formula for the nonlinear parameter f_nl in the case of a sum or product separable potential, we find that it is possible to generate significant non
Externí odkaz:
http://arxiv.org/abs/0807.1101
Warm inflation dynamics is fundamentally based on a system-reservoir configuration in which the dynamics is dictated by a fluctuation-dissipation relation. Recent work by Cerioni et. al. (arXiv:0804.0163) examined dissipative dynamics with no associa
Externí odkaz:
http://arxiv.org/abs/0805.2112
Publikováno v:
Phys.Rev.D77:083514,2008
Using techniques from singular perturbation theory, we explicitly calculate the cosmological evolution in a class of modified gravity models. By considering the (m)CDTT model, which aims to explain the current acceleration of the universe with a modi
Externí odkaz:
http://arxiv.org/abs/0711.3695
Autor:
Hall, Lisa M. H., Peiris, Hiranya V.
Publikováno v:
JCAP 0801:027,2008
(Abridged) We study dissipative inflation in the regime where the dissipative term takes a specific form, \Gamma=\Gamma(\phi), analyzing two models in the weak and strong dissipative regimes with a SUSY breaking potential. After developing intuition
Externí odkaz:
http://arxiv.org/abs/0709.2912
Publikováno v:
JCAP 0711:018,2007
We provide a detailed analysis of the dynamics of moduli fields in the KKLT scenario coupled to a Polonyi field, which plays the role of a hidden matter sector field. It was previously shown that such matter fields can uplift AdS vacua to Minkowski o
Externí odkaz:
http://arxiv.org/abs/0709.2810
Publikováno v:
JCAP 0702:029,2007
Theories beyond the standard model such as string theory motivate low energy effective field theories with several scalar fields which are not only coupled through a potential but also through their kinetic terms. For such theories we derive the gene
Externí odkaz:
http://arxiv.org/abs/astro-ph/0701247
Publikováno v:
Phys.Rev.D74:064028,2006
We consider a modified gravity theory, f(R)=R-a/R^n+bR^m, in the metric formulation, which has been suggested to produce late time acceleration in the Universe, whilst satisfying local fifth-force constraints. We investigate the parameter range for t
Externí odkaz:
http://arxiv.org/abs/hep-th/0608015
Autor:
Hall, Lisa M H, Moss, Ian G
Publikováno v:
Phys.Rev.D71:023514,2005
This paper discusses models of inflation based on global supersymmetry. It is shown that there are parameter ranges, consisent with observational constraints, for which warm inflation occurs and supergravity effects can be neglected. There is no need
Externí odkaz:
http://arxiv.org/abs/hep-ph/0408323