scholarly journals Generalized disformal invariance of cosmological perturbations with second-order field derivatives

2021 ◽  
pp. 136240
Author(s):  
Masato Minamitsuji
Keyword(s):  
Second Order ◽  
Cosmological Perturbations

G-INFLATION: INFLATION WITH THE MOST GENERAL SECOND-ORDER FIELD EQUATIONS

2012 ◽  
Vol 10 ◽  
pp. 77-84
Author(s):  
TSUTOMU KOBAYASHI ◽  
MASAHIDE YAMAGUCHI ◽  
JUN'ICHI YOKOYAMA
Keyword(s):  
Power Spectra ◽  
Second Order ◽  
Stability Criteria ◽  
Cosmological Perturbations ◽  
Field Equations ◽  
Special Cases ◽  
Single Field ◽  
The Stability

In this talk, we have discussed generalized Galileons as a framework to develop the most general single-field inflation models ever, (Generalized) G-inflation, containing previous examples such as k-inflation, extended inflation, and new Higgs inflation as special cases. We have also investigated the background and perturbation evolution in this model, calculating the most general quadratic actions for tensor and scalar cosmological perturbations to give the stability criteria and the power spectra of primordial fluctuations.

scholarly journals Evolution of second-order cosmological perturbations

2004 ◽  
Vol 21 (11) ◽  
pp. L65-L71 ◽  
Author(s):  
Karim A Malik ◽  
David Wands
Keyword(s):  
Second Order ◽  
Cosmological Perturbations

scholarly journals Action approach to cosmological perturbations: the second-order metric in matter dominance

2008 ◽  
Vol 2008 (08) ◽  
pp. 028 ◽  
Author(s):  
Lotfi Boubekeur ◽  
Paolo Creminelli ◽  
Jorge Noreña ◽  
Filippo Vernizzi
Keyword(s):  
Second Order ◽  
Cosmological Perturbations
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