Talk detail

Participant	Sajedi Shacker, Shadi
Institution	University of Hamburg - Gojenbergsweg 112 - Hamburg - Hamburg - Germany

Session	AT1	Accepted		Order	Time
Talk	Poster abstract	Title	Studying the Effect of Varying Causal Structure Constant in Palatini Modified Gravity Theories on the Cosmic Evolution
Coauthors
Abstract	Here, we present preliminary results from our studies of the variation of different facets of the speed of light in the local inertial frame in Palatini formalism. In these theories, different aspects of the speed of light such as $c_{ST}$ (the space-time causal structure constant) and $c_{EM}$ (the electromagnetic wave velocity), do not coincide in the local inertial frame and modify standard $\Lambda$CDM model coming from General Relativity. We apply our model to available data such as Union II or Planck 2013. For instance, we can fit the SN Ia distance modulus and CMB shift parameter in the absence of Dark Energy. Also we apply our model to the comoving Hubble radius and find that our favourable model leads to a larger particle horizon at higher redshifts and hence, can solve the horizon problem without the need for inflation.
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