Inflationary Universe with a Coleman-Weinberg potential meets non-thermal leptogenesis

2021 ◽  
Vol 128 ◽  
pp. 102559
Author(s):  
Grigoris Panotopoulos
Keyword(s):  
Inflationary Universe

PRIMORDIAL BLACK HOLE PAIR CREATION IN R2 THEORY

1998 ◽  
Vol 13 (28) ◽  
pp. 2289-2293 ◽  
Author(s):  
B. C. PAUL ◽  
S. MUKHERJEE ◽  
G. P. SINGH ◽  
A. BEESHAM
Keyword(s):  
Black Holes ◽  
Semiclassical Approximation ◽  
Pair Creation ◽  
Quadratic Term ◽  
Inflationary Universe ◽  
Primordial Black Hole ◽  
Primordial Black Holes ◽  
De Sitter ◽  
Gravitational Action ◽  
Spatial Section

The probability for quantum creation of an inflationary universe with a pair of black holes has been studied in semiclassical approximation with Hartle–Hawking boundary conditions, assuming a gravitational action which includes a quadratic term in the scalar curvature αR2, α being a constant. The action of the instanton responsible for creating such a universe, with a spatial section with S1×S2 topology, is seen to be less than that of a de Sitter S3 instanton, unless α<-1/(8Λ), where Λ is the cosmological constant. Since negative α implies a classical instability, the probability for production of primordial black holes seems to be suppressd in R2-theory.

Fluctuations in the New Inflationary Universe

1982 ◽  
Vol 49 (15) ◽  
pp. 1110-1113 ◽  
Author(s):  
Alan H. Guth ◽  
So-Young Pi
Keyword(s):  
Inflationary Universe

Application of gradient expansion to an inflationary universe

1996 ◽  
Vol 13 (4) ◽  
pp. 705-713 ◽  
Author(s):  
Yasusada Nambu ◽  
Atsushi Taruya
Keyword(s):  
Inflationary Universe ◽  
Gradient Expansion

scholarly journals A New Inflationary Universe Scenario with Inhomogeneous Quantum Vacuum

2018 ◽  
Vol 2018 ◽  
pp. 1-15
Author(s):  
Yilin Chen ◽  
Jin Wang
Keyword(s):  
Green’S Function ◽  
Potential Barrier ◽  
Green's Function ◽  
Inflationary Universe ◽  
Quantum Vacuum ◽  
Vacuum Fluctuations ◽  
Inflationary Scenario ◽  
Slowing Down ◽  
The Universe ◽  
Inhomogeneous Quantum

We investigate the quantum vacuum and find that the fluctuations can lead to the inhomogeneous quantum vacuum. We find that the vacuum fluctuations can significantly influence the cosmological inhomogeneity, which is different from what was previously expected. By introducing the modified Green’s function, we reach a new inflationary scenario which can explain why the Universe is still expanding without slowing down. We also calculate the tunneling amplitude of the Universe based on the inhomogeneous vacuum. We find that the inhomogeneity can lead to the penetration of the Universe over the potential barrier faster than previously thought.

Graviton creation in the inflationary universe and the grand unification scale

1982 ◽  
Vol 115 (3) ◽  
pp. 189-192 ◽  
Author(s):  
V.A. Rubakov ◽  
M.V. Sazhin ◽  
A.V. Veryaskin
Keyword(s):  
Grand Unification ◽  
Inflationary Universe
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