Multiple gravitational actions in multimetric gravity
by
MrKevin Croker(UH Physics)
→
Pacific/Honolulu
417A (WAT)
417A
WAT
Description
In the setting of Einstein-like gravity with multiple metric tensors,
it is argued that the appropriate generalization of universal coupling
requires revision to the canonical model-building formalism. In
particular, we argue that geometric consistency in the context of
multiple metrics precludes consideration of a single
action from which all dynamical fields are determined. We present a
toy two-action model exhibiting mathematical features previously
overlooked and exhibit a non-trivial solution set. We then apply the
toy model to the core/cusp problem of galactic dark matter halos and
extract experimental predictions via a successive approximation
scheme. In particular, observers bound to a Minkowski metric encounter
a pseudo-isothermal sphere profile with well-behaved temporal growth.
The model is easily fit to observation and predicts a simple algebraic
dependence between previously phenomenological fit parameters core
radius $R_C$ and central density $\rho_0$ of pseudo-isothermal fits.