Elsevier

Physics Letters B

Volume 757, 10 June 2016, Pages 247-250
Physics Letters B

A cyclic universe approach to fine tuning

https://doi.org/10.1016/j.physletb.2016.03.082Get rights and content
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Abstract

We present a closed bouncing universe model where the value of coupling constants is set by the dynamics of a ghost-like dilatonic scalar field. We show that adding a periodic potential for the scalar field leads to a cyclic Friedmann universe where the values of the couplings vary randomly from one cycle to the next. While the shuffling of values for the couplings happens during the bounce, within each cycle their time-dependence remains safely within present observational bounds for physically-motivated values of the model parameters. Our model presents an alternative to solutions of the fine tuning problem based on string landscape scenarios.

Keywords

Fine-tuning
Cyclic universe
Standard Model couplings

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