Variable Speed of Light Cosmology, Primordial Fluctuations and Gravitational Waves

Understand

A variable speed of light (VSL) cosmology is described in which the causal mechanism of generating primordial perturbations is achieved by varying the speed of light in a primordial epoch.

• This yields an alternative to inflation for explaining the formation of the cosmic microwave background (CMB) and the large scale structure (LSS) of the universe.
• The initial value horizon and flatness problems in cosmology are solved.
• The model predicts primordial scalar and tensor fluctuation spectral indices $n_s=0.96$ and $n_t=- 0.04$, respectively.