TL;DR
This paper proposes a model where the fine structure constant varies over space and time, extending previous models by incorporating a scalar field with non-canonical kinetic terms, and analyzes its cosmological implications.
Contribution
It introduces a new variation of the alpha-changing model using a ghost condensate scalar field and studies its cosmological dynamics.
Findings
Alpha does not settle to a constant at late times under certain kinetic conditions.
The model extends previous alpha variation theories with non-canonical kinetic structures.
Cosmological behavior analyzed using dynamical systems techniques.
Abstract
We introduce a model which allows the fine structure constant (alpha) to vary throughout space and time due to a coupling to a scalar field with a non-canonical kinetic structure. This provided a new extension of the Bekenstein-Sandvik-Barrow-Magueijo model of alpha variations. The background cosmology is studied in detail using dynamical systems techniques for a scalar field of ghost condensate type. We show generically that if the kinetic terms are chosen to allow an accelerated late-time attractor for the expansion scale factor then alpha will not asymptote to a constant at late times.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.