Mimetic inflation
نویسندگان
چکیده
A bstract We study inflationary solution in an extension of mimetic gravity with the higher derivative interactions coupled to gravity. Because setup is free from ghost and gradient instabilities while it hosts a number novel properties. The dispersion relation scalar perturbations develop quartic momentum correction similar inflation. Furthermore, tilt tensor can take either signs modified consistency between amplitude perturbations. Despite presence propagate speed equal light as required by LIGO observations. induce non-trivial cubic Hamiltonian, generating non-Gaussianities various shapes such equilateral, orthogonal squeezed configurations observable amplitudes.
منابع مشابه
Inflation and Eternal Inflation
The basic workings of inflationary models are summarized, along with the arguments that strongly suggest that our universe is the product of inflation. The mechanisms that lead to eternal inflation in both new and chaotic models are described. Although the infinity of pocket universes produced by eternal inflation are unobservable, it is argued that eternal inflation has real consequences in te...
متن کاملInflation Targets and Inflation Targeting
There is widespread agreement that price stability (in practice, low and stable inflation) should be an objective of monetary policy. This agreement is reflected both in the mandates set for monetary policy by governments and in the practice of central banks. Several other important questions about the objectives for monetary policy are less settled: Should there be other objectives? If there a...
متن کاملInflation Dynamics and Inflation Regimes
In this paper we develop and estimate a new-Keynesian model of inflation and use it to investigate the hypothesis that prices in the UK are re-set more frequently during periods of high inflation. In the model, firms are assumed to condition their expectations on an optimally-selected but incomplete information set and we further assume that the probability that they will reset their price in a...
متن کاملInflation How Does Inflation Work?
The basic workings of inflationary models are summarized, along with the arguments that strongly suggest that our universe is the product of inflation. I describe the quantum origin of density perturbations, giving a heuristic derivation of the scale invariance of the spectrum and the leading corrections to scale invariance. The mechanisms that lead to eternal inflation in both new and chaotic ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2021
ISSN: ['1127-2236', '1126-6708', '1029-8479']
DOI: https://doi.org/10.1007/jhep01(2021)183