Institute for Advanced Study Astrophysics Seminar
Equivalence Principle and Cosmic Acceleration
Theories that attempt to explain the observed cosmic acceleration
generally introduce new degrees of freedom (such as a scalar) that
are active on large scales but must be screened on small scales.
We show that O(1) equivalence principle violations are expected
if the screening mechanism is chameleon or symmetron, while such
violations are O(v/c)2 suppressed if the screening mechanism is Vainshtein.
This violation of equivalence principle occurs despite a universal
scalar-matter coupling, and is the result of a classical renormalization
of the scalar charge for a macroscopic object. Observational tests
will be discussed.
Date & Time
March 16, 2010 | 11:00am
Location
Bloomberg Hall Astrophysics LibrarySpeakers
Affiliation
Columbia University