PIRSA:05030105

Chameleon Scalar Fields: Detecting Dark Energy with Tests of Gravity

Khoury, J. (2005). Chameleon Scalar Fields: Detecting Dark Energy with Tests of Gravity. Perimeter Institute. https://pirsa.org/05030105

Khoury, Justin. Chameleon Scalar Fields: Detecting Dark Energy with Tests of Gravity. Perimeter Institute, Mar. 10, 2005, https://pirsa.org/05030105 

          @misc{ pirsa_PIRSA:05030105,
            doi = {10.48660/05030105},
            url = {https://pirsa.org/05030105},
            author = {Khoury, Justin},
            keywords = {Cosmology},
            language = {en},
            title = {Chameleon Scalar Fields: Detecting Dark Energy with Tests of Gravity},
            publisher = {Perimeter Institute},
            year = {2005},
            month = {mar},
            note = {PIRSA:05030105 see, \url{https://pirsa.org}}
          }

Justin Khoury

University of Pennsylvania

Talk number
PIRSA:05030105
Collection
Talk Type
Subject
Abstract
Chameleon scalar fields are candidates for the dark energy, the mysterious component causing the observed acceleration of the universe. Their defining property is a mass which depends on the local matter density: they are massive on Earth, where the density is high, but essentially massless in the cosmos, where the density is much lower. All current constraints from tests of general relativity are satisfied. Nevertheless, chameleons lead to striking predictions for tests of gravity in the laboratory and in space. For example, near-future satellite experiments could measure an effective Newton's constant in space different by a factor of order unity from that on Earth, as well as violations of the Equivalence Principle stronger than currently allowed by laboratory experiments. Such signatures raise the exciting possibility of detecting dark energy through local tests of gravity.