Journal
PHYSICAL REVIEW D
Volume 96, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.96.044041
Keywords
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Funding
- U.K. Science and Technologies Facilities Council (STFC) [ST/L00044X / 1]
- STFC [ST/N000668/1]
- European Research Council (ERC) [646702]
- Japan Society for the Promotion of Science (JSPS) [24540256, 17H02890, 17H06359, 17H06357]
- World Premier International Research Center Initiative (WPI), MEXT, Japan
- STFC [ST/N000668/1, ST/L00044X/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/N000668/1, ST/L00044X/1] Funding Source: researchfish
- Grants-in-Aid for Scientific Research [17H02890, 17H06357] Funding Source: KAKEN
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We present a novel cosmological solution in the framework of extended quasidilaton theory which underwent scrutiny recently. We only consider terms that do not generate the Boulware-Deser degree of freedom, hence the ghost-free quasidilaton theory, and show three new branches of cosmological evolution therein. One of the solutions passes the perturbative stability tests. This new solution exhibits a late time self-acceleration and all graviton polarizations acquire masses that converge to a constant in the asymptotic future. Moreover, all modes propagate at the speed of light. We propose that this solution can be used as a benchmark model for future phenomenological studies.
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