TY - JOUR
T1 - Chameleon effect in the Jordan frame of the Brans-Dicke theory
AU - Quiros, Israel
AU - García-Salcedo, Ricardo
AU - Gonzalez, Tame
AU - Horta-Rangel, F. Antonio
N1 - Publisher Copyright:
© 2015 American Physical Society.
PY - 2015/8/28
Y1 - 2015/8/28
N2 - In this paper we investigate the chameleon effect in the different conformal frames of the Brans-Dicke (BD) theory. Given that, in the standard literature on the subject, the chameleon is described in the Einstein frame almost exclusively, here we pay special attention to the description of this effect in the Jordan and in the string frames. It is shown that, in general, terrestrial and solar system bounds on the mass of the BD scalar field, and bounds of cosmological origin, are difficult to reconcile at once through a single chameleon potential. We point out that, in a cosmological context, provided that the effective chameleon potential has a minimum within a region of constant density of matter, the Brans-Dicke theory transmutes into general relativity with a cosmological constant, in that region. This result, however, can be only locally valid.
AB - In this paper we investigate the chameleon effect in the different conformal frames of the Brans-Dicke (BD) theory. Given that, in the standard literature on the subject, the chameleon is described in the Einstein frame almost exclusively, here we pay special attention to the description of this effect in the Jordan and in the string frames. It is shown that, in general, terrestrial and solar system bounds on the mass of the BD scalar field, and bounds of cosmological origin, are difficult to reconcile at once through a single chameleon potential. We point out that, in a cosmological context, provided that the effective chameleon potential has a minimum within a region of constant density of matter, the Brans-Dicke theory transmutes into general relativity with a cosmological constant, in that region. This result, however, can be only locally valid.
UR - http://www.scopus.com/inward/record.url?scp=84940837575&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.92.044055
DO - 10.1103/PhysRevD.92.044055
M3 - Artículo
SN - 1550-7998
VL - 92
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 4
M1 - 044055
ER -