We analyze the consequences of different evolutions of the Hubble parameter on the spectrum of scalar inflationary perturbations. The analysis is restricted to inflationary phases described by a transient evolution, when uncommon features arise in the inflationary spectra that may lead to an amplitude enhancement. We then discuss how the spectrum is, respectively, amplified or blue-tilted in the presence or absence of a growing solution of the Mukhanov-Sasaki equation. The cases of general relativity with a minimally coupled inflaton and that of induced gravity are considered explicitly. Finally, some remarks on constant roll inflation are discussed.

Leonardo Chataignier, Alexander Yu. Kamenshchik, Alessandro Tronconi, Giovanni Venturi (2023). Reconstruction methods and the amplification of the inflationary spectrum. PHYSICAL REVIEW D, 107(8), 1-13 [10.1103/physrevd.107.083506].

Reconstruction methods and the amplification of the inflationary spectrum

Leonardo Chataignier;Alexander Yu. Kamenshchik;Alessandro Tronconi;Giovanni Venturi
2023

Abstract

We analyze the consequences of different evolutions of the Hubble parameter on the spectrum of scalar inflationary perturbations. The analysis is restricted to inflationary phases described by a transient evolution, when uncommon features arise in the inflationary spectra that may lead to an amplitude enhancement. We then discuss how the spectrum is, respectively, amplified or blue-tilted in the presence or absence of a growing solution of the Mukhanov-Sasaki equation. The cases of general relativity with a minimally coupled inflaton and that of induced gravity are considered explicitly. Finally, some remarks on constant roll inflation are discussed.
2023
Leonardo Chataignier, Alexander Yu. Kamenshchik, Alessandro Tronconi, Giovanni Venturi (2023). Reconstruction methods and the amplification of the inflationary spectrum. PHYSICAL REVIEW D, 107(8), 1-13 [10.1103/physrevd.107.083506].
Leonardo Chataignier; Alexander Yu. Kamenshchik; Alessandro Tronconi; Giovanni Venturi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/923672
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