scholarly journals Local-gravity test of unified models of inflation and dark energy in f(R) gravity

2020 ◽  
Vol 102 (4) ◽  
Author(s):  
Mai Yashiki ◽  
Nobuyuki Sakai ◽  
Ryo Saito
Keyword(s):  
Dark Energy ◽  
Local Gravity ◽  
Gravity Test

RECENT STATUS OF DARK ENERGY

2010 ◽  
Vol 25 (11n12) ◽  
pp. 843-858 ◽  
Author(s):  
SHINJI TSUJIKAWA
Keyword(s):  
Dark Energy ◽  
Cosmological Constant ◽  
Chaplygin Gas ◽  
Cosmic Acceleration ◽  
Late Time ◽  
Energy Models ◽  
Local Gravity ◽  
Dynamical Dark Energy

We review a number of approaches that have been adopted to explain the origin of dark energy responsible for the late-time cosmic acceleration. This includes the cosmological constant and dynamical dark energy models such as quintessence, k -essence, Chaplygin gas, f(R) gravity, scalar-tensor theories, and braneworld models. We also discuss observational and local gravity constraints on those models and clarify which models are favored or ruled out in current observations.

scholarly journals Non-Locality and Late-Time Cosmic Acceleration from an Ultraviolet Complete Theory †

Universe ◽  
2018 ◽  
Vol 4 (8) ◽  
pp. 82 ◽  
Author(s):  
Gaurav Narain ◽  
Tianjun Li
Keyword(s):  
Dark Energy ◽  
Local Treatment ◽  
Scalar Fields ◽  
Cosmic Acceleration ◽  
Late Time ◽  
Scale Invariant ◽  
Higher Derivative ◽  
Local Gravity ◽  
Non Local ◽  
Non Locality

A local phenomenological model that reduces to a non-local gravitational theory giving dark energy is proposed. The non-local gravity action is known to fit the data as well as Λ-CDM thereby demanding a more fundamental local treatment. It is seen that the scale-invariant higher-derivative scalar-tensor theory of gravity, which is known to be ultraviolet perturbative renormalizable to all loops and where ghosts become innocuous, generates non-locality at low energies. The local action comprises of two real scalar fields coupled non-minimally with the higher-derivative gravity action. When one of the scalar acquiring the Vacuum Expectation Value (VEV) induces Einstein–Hilbert gravity, generates mass for fields, and gets decoupled from system, it leaves behind a residual theory which in turn leads to a non-local gravity generating dark energy effects.

scholarly journals Constraints on scalar-tensor models of dark energy from observational and local gravity tests

2008 ◽  
Vol 77 (10) ◽  
Author(s):  
Shinji Tsujikawa ◽  
Kotub Uddin ◽  
Shuntaro Mizuno ◽  
Reza Tavakol ◽  
Jun’ichi Yokoyama
Keyword(s):  
Dark Energy ◽  
Tensor Models ◽  
Local Gravity

Dark energy on firmer footing

Nature ◽  
2010 ◽  
Author(s):  
Eugenie Samuel Reich
Keyword(s):  
Dark Energy

Dark energy probe gets high praise

Nature ◽  
2007 ◽  
Author(s):  
Geoff Brumfiel
Keyword(s):  
Dark Energy
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