TY - JOUR
A2 - Bambi, Cosimo
AU - Oikonomou, V. K.
AU - Karagiannakis, N.
PY - 2014
DA - 2014/08/17
TI - Study of Antigravity in an Model and in Brans-Dicke Theory with Cosmological Constant
SP - 625836
VL - 2014
AB - We study antigravity, that is, having an effective gravitational constant with a negative sign, in scalar-tensor theories originating from F(R) theory and in a Brans-Dicke model with cosmological constant. For the F(R) theory case, we obtain the antigravity scalar-tensor theory in the Jordan frame by using a variant of the Lagrange multipliers method and we numerically study the time dependent effective gravitational constant. As we will demonstrate by using a specific F(R) model, although there is no antigravity in the initial model, it might occur or not in the scalar-tensor counterpart, mainly depending on the parameter that characterizes antigravity. Similar results hold true in the Brans-Dicke model.
SN - 2356-7422
UR - https://doi.org/10.1155/2014/625836
DO - 10.1155/2014/625836
JF - Journal of Gravity
PB - Hindawi Publishing Corporation
KW -
ER -