Pixelated Dark Energy

Heckman, Jonathan J.; Lawrie, Craig; Lin, Ling; Sakstein, Jeremy; Zoccarato, Gianluca

doi:10.1002/prop.201900071

Pixelated Dark Energy

Journal Article · Fri Sep 13 00:00:00 EDT 2019 · Fortschritte der Physik

DOI:https://doi.org/10.1002/prop.201900071· OSTI ID:1562122

Heckman, Jonathan J. ^[1]; Lawrie, Craig ^[1]; Lin, Ling ^[1]; Sakstein, Jeremy ^[1]; ^[1]

Department of Physics and Astronomy University of Pennsylvania Philadelphia PA 19104 USA

Abstract

We study the phenomenology of a recent string construction with a quantum mechanically stable dark energy. A mild supersymmetry protects the vacuum energy but also allows TeV scale superpartner masses. The construction is holographic in the sense that the 4D spacetime is generated from “spacetime pixels” originating from five‐branes wrapped over metastable five‐cycles of the compactification. The cosmological constant scales as in the pixel number. An instability in the construction leads to cosmic expansion. This also causes more five‐branes to wind up in the geometry, leading to a slowly decreasing cosmological constant which we interpret as an epoch of inflation followed by (pre‐)heating when a rare event occurs in which the number of pixels increases by an order one fraction. The sudden appearance of radiation triggers an exponential increase in the number of pixels. Dark energy has a time varying equation of state with , which is compatible with current bounds, and could be constrained further by future data releases. The pixelated nature of the Universe also implies a large‐ l cutoff on the angular power spectrum of cosmological observables with . We also use this pixel description to study the thermodynamics of de Sitter space, finding rough agreement with effective field theory considerations.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

OSTI ID:: 1562122

Alternate ID(s):: OSTI ID: 1804012
OSTI ID: 22849070

Journal Information:: Fortschritte der Physik, Journal Name: Fortschritte der Physik Journal Issue: 11 Vol. 67; ISSN 0015-8208

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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