An expansion of well tempered gravity
Linder E. Appleby S.
March 2021IOP Publishing Ltd
Journal of Cosmology and Astroparticle Physics
2021#2021Issue 3
When faced with two nigh intractable problems in cosmology - how to remove the original cosmological constant problem and how to parametrize modified gravity to explain current cosmic acceleration - we can make progress by counterposing them. The well tempered solution to the cosmological constant through degenerate scalar field dynamics also relates disparate Horndeski gravity terms, making them contrapuntal. We derive the connection between the kinetic term K and braiding term G3 for shift symmetric theories (including the running Planck mass G4), extending previous work on monomial or binomial dependence to polynomials of arbitrary finite degree. We also exhibit an example for an infinite series expansion. This contrapuntal condition greatly reduces the number of parameters needed to test modified gravity against cosmological observations, for these goldentheories of gravity.
dark energy theory , modified gravity
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Berkeley Center for Cosmological Physics and Berkeley Lab, University of California, Berkeley, 94720, CA, United States
Energetic Cosmos Laboratory, Nazarbayev University, Nur-Sultan, 010000, Kazakhstan
Asia Pacific Center for Theoretical Physics, Pohang, 37673, South Korea
Berkeley Center for Cosmological Physics and Berkeley Lab
Energetic Cosmos Laboratory
Asia Pacific Center for Theoretical Physics
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