scholarly journals Modified gravity and the stability of de Sitter space

2005 ◽  
Vol 72 (6) ◽  
Author(s):  
Valerio Faraoni
Keyword(s):  
Modified Gravity ◽  
De Sitter Space ◽  
De Sitter ◽  
The Stability

scholarly journals Unified Inflation and Late-Time Accelerated Expansion with Exponential and R2 Corrections in Modified Gravity

Symmetry ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 794
Author(s):  
Luis Granda
Keyword(s):  
Modified Gravity ◽  
Initial Conditions ◽  
Gravity Models ◽  
Accelerated Expansion ◽  
Late Time ◽  
Time Behavior ◽  
De Sitter ◽  
Cosmological Observations ◽  
Leading Term ◽  
The Stability

Modified gravity models with and exponential function of curvature and R 2 corrections are proposed. At low curvature, the model explains the matter epoch and the late time accelerated expansion while at the inflation epoch the leading term is R 2 . At R → 0 the cosmological constant disappears, giving unified description of inflation and dark energy in pure geometrical context. The models satisfy the stability conditions, pass local tests and are viable in the ( r , m ) -plane, where the trajectories connect the saddle matter dominated critical point ( r = − 1 , m = 0 ) with the late time de Sitter attractor at r = − 2 and 0 < m ≤ 1 . Initial conditions were found, showing that the density parameters evolve in a way consistent with current cosmological observations, predicting late time behavior very close to the Λ CDM with future universe evolving towards the de Sitter attractor.

The stability of the de Sitter space-time in fourth order gravity

1988 ◽  
Vol 202 (2) ◽  
pp. 198-200 ◽  
Author(s):  
V. Müller ◽  
H.-J. Schmidt ◽  
A.A. Starobinsky
Keyword(s):  
Fourth Order ◽  
De Sitter Space ◽  
Space Time ◽  
De Sitter ◽  
The Stability

On the stability of a self-similar spherical bubble of a scalar Higgs field in de Sitter space

2005 ◽  
Vol 68 (7) ◽  
pp. 1218-1226 ◽  
Author(s):  
N. A. Voronov ◽  
L. Dyshko ◽  
N. B. Konyukhova
Keyword(s):  
Higgs Field ◽  
De Sitter Space ◽  
De Sitter ◽  
Spherical Bubble ◽  
Self Similar ◽  
The Stability

On the stability of de Sitter space in the presence of particle production

1985 ◽  
Vol 151 (5-6) ◽  
pp. 339-342 ◽  
Author(s):  
Paul R. Anderson ◽  
R. Holman
Keyword(s):  
Particle Production ◽  
De Sitter Space ◽  
De Sitter ◽  
The Stability
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