Abstract
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 "golden"
theories of gravity.