scholarly journals Second-order cosmological perturbations. III. Produced by scalar-scalar coupling during radiation-dominated stage

2018 ◽  
Vol 98 (12) ◽  
Author(s):  
Bo Wang ◽  
Yang Zhang
Keyword(s):  
Second Order ◽  
Scalar Coupling ◽  
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 Application of multiplet structure deconvolution to extract scalar coupling constants from 1D NMR spectra

2021 ◽  
Author(s):  
Damien Jeannerat ◽  
Carlos Cobas
Keyword(s):  
Nmr Spectra ◽  
Chemical Shifts ◽  
Second Order ◽  
Coupling Constants ◽  
Scalar Coupling ◽  
Order Effects ◽  
Robust Method ◽  
Multiplet Structure ◽  
First Order ◽  
Coupling Structure

Abstract. Multiplet structure deconvolution provides a robust method to determine the values of the coupling constants in first-order 1D NMR spectra. Functions simplifying the coupling structure for any spins and for doublet with unequal amplitudes were introduced. The chemical shifts of the coupling partners causing mild second-order effects can, in favourable cases, be calculated from the slopes measured in doublet structures. Illustrations demonstrate that deconvolution can straightforwardly analyse multiplet posing difficulties to humans and, in some cases, extract coupling constants from unresolved multiplets.

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
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