Zobrazeno 1 - 10
of 584
pro vyhledávání: '"Bruck C"'
The epochs of reheating and preheating are studied in a simple extension of the Starobinsky inflationary model, which consists of an $R^2$--correction to the Einstein--Hilbert action and an additional scalar field. We find that if the $R^2$--correcti
Externí odkaz:
http://arxiv.org/abs/1606.04346
Autor:
van de Bruck, C., Morrice, J.
Interactions between dark matter and dark energy, allowing both conformal and and disformal couplings, are studied in detail. We discuss the background evolution, anisotropies in the cosmic microwave background and large scale structures. One of our
Externí odkaz:
http://arxiv.org/abs/1501.03073
Autor:
van de Bruck, C., Vu, S.
The evolution of the non-adiabatic pressure perturbation during inflation driven by two scalar fields is studied numerically for three different types of models. In the first model, the fields have standard kinetic terms. The other two models conside
Externí odkaz:
http://arxiv.org/abs/1211.4757
Autor:
van de Bruck, C., Sculthorpe, G.
In this paper we consider scalar-tensor theories, allowing for both conformal and disformal couplings to a fluid with a generic equation of state. We derive the effective coupling for both background cosmology and for perturbations in that fluid. As
Externí odkaz:
http://arxiv.org/abs/1210.2168
Publikováno v:
Phys.Rev.Lett.104:241101,2010
We have calculated the chameleon pressure between two parallel plates in the presence of an intervening medium that affects the mass of the chameleon field. As intuitively expected, the gas in the gap weakens the chameleon interaction mechanism with
Externí odkaz:
http://arxiv.org/abs/1003.1605
Publikováno v:
Phil.Trans.Roy.Soc.Lond.A366:2833-2842,2008
Brane inflation and the production of topological defects at the end of the inflationary phase are discussed. After a description of the inflationary setup we discuss the properties of the cosmic strings produced at the end of inflation. Specific exa
Externí odkaz:
http://arxiv.org/abs/0803.0424
Publikováno v:
Phys.Rev.D77:043006,2008
Cosmological observations have revealed the existence of a dark matter sector, which is commonly assumed to be made up of one particle species only. However, this sector might be more complicated than we currently believe: there might be more than on
Externí odkaz:
http://arxiv.org/abs/0709.2297
Publikováno v:
Phys.Rev.D76:085010,2007
It was recently argued that the observed PVLAS anomaly can be explained by chameleon field theories in which large deviations from Newton's law can be avoided. Here we present the predictions for the dichroism and the birefringence induced in the vac
Externí odkaz:
http://arxiv.org/abs/0707.2801
We review some of the properties of chameleon theories. Chameleon fields are gravitationally coupled to matter and evade gravitational tests thanks to two fundamental properties. The first one is the density dependence of the chameleon mass. In most
Externí odkaz:
http://arxiv.org/abs/0706.1024
Publikováno v:
Phys.Rev.Lett.99:121103,2007
We analyse the PVLAS results using a chameleon field whose properties depend on the environment. We find that, assuming a runaway bare potential $V(\phi)$ and a universal coupling to matter, the chameleon potential is such that the scalar field can a
Externí odkaz:
http://arxiv.org/abs/hep-ph/0703243