Continuity, localization, and cosmology in warped geometry

Gregory Gabadadze (Center for Cosmology and Particle Physics, Department of Physics New York University, New York, New York 10003, USA) ; Daniel Older (Center for Cosmology and Particle Physics, Department of Physics New York University, New York, New York 10003, USA) ; David Pirtskhalava (Center for Cosmology and Particle Physics, Department of Physics New York University, New York, New York 10003, USA)

This is the first of two papers studying localization of massive bulk fields on a bane in 5D anti–de Sitter spacetime, and some of their cosmological consequences. Here we focus on a massive 5D scalar, which is known to lack a localized mode, and discuss how a seeming discontinuity between this theory and the massless theory—known to support a localized zero mode—is resolved thanks to peculiar analytic properties of the massive two-point amplitude. Furthermore, we propose a boundary term that leads to the emergence of a massless localized mode in the massive theory. Last but not least, we consider the case when the brane world volume is de Sitter spacetime, and prove the existence of a localized massive mode. We discuss how these results, taken collectively, can be used to describe the accelerated expansion due to the massive 5D scalar field in an early, or in a late-time universe.

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Published on:
12 November 2021
Publisher:
APS
Published in:
Physical Review D , Volume 104 (2021)
Issue 10
DOI:
https://doi.org/10.1103/PhysRevD.104.104031
arXiv:
2107.08160
Copyrights:
Published by the American Physical Society
Licence:
CC-BY-4.0

Fulltext files: