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Title: A cyclic universe approach to fine tuning

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. (C) 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3).

Authors:
; ORCiD logo;
Publication Date:
Research Org.:
Dartmouth College, Hanover, NH (United States).
Sponsoring Org.:
USDOE
OSTI Identifier:
1245636
Alternate Identifier(s):
OSTI ID: 1280698; OSTI ID: 1280699
Grant/Contract Number:  
SC0010386
Resource Type:
Published Article
Journal Name:
Physics Letters B
Additional Journal Information:
Journal Name: Physics Letters B Journal Volume: 757 Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Fine-tuning; Cyclic universe; Standard Model couplings; superstrings

Citation Formats

Alexander, Stephon, Cormack, Sam, and Gleiser, Marcelo. A cyclic universe approach to fine tuning. Netherlands: N. p., 2016. Web. doi:10.1016/j.physletb.2016.03.082.
Alexander, Stephon, Cormack, Sam, & Gleiser, Marcelo. A cyclic universe approach to fine tuning. Netherlands. https://doi.org/10.1016/j.physletb.2016.03.082
Alexander, Stephon, Cormack, Sam, and Gleiser, Marcelo. Wed . "A cyclic universe approach to fine tuning". Netherlands. https://doi.org/10.1016/j.physletb.2016.03.082.
@article{osti_1245636,
title = {A cyclic universe approach to fine tuning},
author = {Alexander, Stephon and Cormack, Sam and Gleiser, Marcelo},
abstractNote = {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 (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3).},
doi = {10.1016/j.physletb.2016.03.082},
journal = {Physics Letters B},
number = C,
volume = 757,
place = {Netherlands},
year = {Wed Jun 01 00:00:00 EDT 2016},
month = {Wed Jun 01 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1016/j.physletb.2016.03.082

Citation Metrics:
Cited by: 9 works
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