TY - JOUR
T1 - ΛcDM universe in f(R) gravity
AU - Dunsby, Peter K.S.
AU - Elizalde, Emilio
AU - Goswami, Rituparno
AU - Odintsov, Sergei
AU - Saez-Gomez, Diego
PY - 2010/7/22
Y1 - 2010/7/22
N2 - Several different explicit reconstructions of f(R) gravity are obtained from the background Friedmann-Laîmatre-Robertson-Walker expansion history. It is shown that the only theory whose Lagrangian is a simple function of the Ricci scalar R, that admits an exact ΛCDM expansion history, is standard general relativity with a positive cosmological constant and the only way to obtain this behavior of the scale factor for more general functions of R is to add additional degrees of freedom to the matter sector. © 2010 The American Physical Society.
AB - Several different explicit reconstructions of f(R) gravity are obtained from the background Friedmann-Laîmatre-Robertson-Walker expansion history. It is shown that the only theory whose Lagrangian is a simple function of the Ricci scalar R, that admits an exact ΛCDM expansion history, is standard general relativity with a positive cosmological constant and the only way to obtain this behavior of the scale factor for more general functions of R is to add additional degrees of freedom to the matter sector. © 2010 The American Physical Society.
U2 - 10.1103/PhysRevD.82.023519
DO - 10.1103/PhysRevD.82.023519
M3 - Article
SN - 1550-7998
VL - 82
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 2
M1 - 023519
ER -