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Title: A cyclic universe approach to fine tuning

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. (C) 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license ( Funded by SCOAP(3).
 [1] ; ORCiD logo [2] ;  [2]
  1. Dartmouth College, Hanover, NH (United States). Dept. of Physics and Astronomy; Brown Univ., Providence, RI (United States). Dept. of Physics
  2. Dartmouth College, Hanover, NH (United States). Dept. of Physics and Astronomy
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 757; Journal Issue: C; Journal ID: ISSN 0370-2693
Research Org:
Dartmouth College, Hanover, NH (United States).
Sponsoring Org:
Country of Publication:
United States
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Fine-tuning; Cyclic universe; Standard Model couplings; superstrings