Ricci Flow Approach to the Cosmological Constant Problem
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DOI: 10.1007/s10701-021-00405-4
Abstract: In order to resolve the cosmological constant problem, the notion of reference frame is re-examined at the quantum level. By using a quantum non-linear sigma model (Q-NLSM), a theory of quantum spacetime reference frame is… read more here.
Keywords: ricci flow; cosmological constant; geometry; constant problem ... See more keywords
Cosmological constant problem: deflation during inflation
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2020/01/021
Abstract: We argue that the discrepancy between the Planck mass scale and the observed value of the cosmological constant can be largely attenuated if those quantities are understood as a result of effective, and thus scale-dependent,… read more here.
Keywords: cosmological constant; cosmology; constant problem; problem deflation ... See more keywords
Manifestly Local Formulation of Nonlocal Approach to the Cosmological Constant Problem
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DOI: 10.1103/physrevd.95.104020
Abstract: We present a manifestly local and general coordinate invariant formulation of a nonlocal approach to the cosmological constant problem which has been recently proposed by Carroll and Remmen. To do that, we need to introduce… read more here.
Keywords: cosmological constant; nonlocal approach; formulation nonlocal; constant problem ... See more keywords
A nonlocal approach to the cosmological constant problem
Sign Up to like & getrecommendations! Published in 2017 at "Physical Review D"
DOI: 10.1103/physrevd.95.123504
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… read more here.
Keywords: cosmological constant; approach cosmological; nonlocal approach; model ... See more keywords
Unimodular Approaches to the Cosmological Constant Problem
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DOI: 10.3390/universe9030131
Abstract: We review selected aspects of unimodular gravity and we discuss its viability as a solution of the old cosmological constant problem. In unimodular gravity, the cosmological constant is promoted to a global degree of freedom.… read more here.
Keywords: cosmological constant; constant problem; unimodular gravity; problem ... See more keywords