A nonlocal approach to the cosmological constant problem
Abstract
We construct a model in which the cosmological constant is canceled from the gravitational equations of motion. Our model relies on two key ingredients: a nonlocal constraint on the action, which forces the spacetime average of the Lagrangian density to vanish, and a dynamical way for this condition to be satisfied classically with arbitrary matter content. We implement the former condition with a spatially constant Lagrange multiplier associated with the volume form and the latter by including a free fourform gauge field strength in the action. These two features are enough to remove the cosmological constant from the Einstein equation. The model is consistent with all cosmological and experimental bounds on modification of gravity and allows for both cosmic inflation and the present epoch of acceleration.
 Authors:

 California Institute of Technology (CalTech), Pasadena, CA (United States). Walter Burke Institute for Theoretical Physics
 Publication Date:
 Research Org.:
 California Institute of Technology (CalTech), Pasadena, CA (United States)
 Sponsoring Org.:
 USDOE Office of Science (SC), High Energy Physics (HEP) (SC25); Foundational Questions Institute; National Science Foundation (NSF)
 OSTI Identifier:
 1599605
 Alternate Identifier(s):
 OSTI ID: 1361933
 Report Number(s):
 CALTTH2017016
Journal ID: ISSN 24700010; PRVDAQ
 Grant/Contract Number:
 SC0011632; DGE1144469
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Physical Review D
 Additional Journal Information:
 Journal Volume: 95; Journal Issue: 12; Journal ID: ISSN 24700010
 Publisher:
 American Physical Society (APS)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Carroll, Sean M., and Remmen, Grant N. A nonlocal approach to the cosmological constant problem. United States: N. p., 2017.
Web. doi:10.1103/PhysRevD.95.123504.
Carroll, Sean M., & Remmen, Grant N. A nonlocal approach to the cosmological constant problem. United States. doi:10.1103/PhysRevD.95.123504.
Carroll, Sean M., and Remmen, Grant N. Wed .
"A nonlocal approach to the cosmological constant problem". United States. doi:10.1103/PhysRevD.95.123504. https://www.osti.gov/servlets/purl/1599605.
@article{osti_1599605,
title = {A nonlocal approach to the cosmological constant problem},
author = {Carroll, Sean M. and Remmen, Grant N.},
abstractNote = {We construct a model in which the cosmological constant is canceled from the gravitational equations of motion. Our model relies on two key ingredients: a nonlocal constraint on the action, which forces the spacetime average of the Lagrangian density to vanish, and a dynamical way for this condition to be satisfied classically with arbitrary matter content. We implement the former condition with a spatially constant Lagrange multiplier associated with the volume form and the latter by including a free fourform gauge field strength in the action. These two features are enough to remove the cosmological constant from the Einstein equation. The model is consistent with all cosmological and experimental bounds on modification of gravity and allows for both cosmic inflation and the present epoch of acceleration.},
doi = {10.1103/PhysRevD.95.123504},
journal = {Physical Review D},
number = 12,
volume = 95,
place = {United States},
year = {2017},
month = {6}
}
Web of Science
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