Large power spectrum and primordial black holes in the effective theory of inflation

Abstract

We study the generation of a large power spectrum, necessary for primordial black hole formation, within the effective theory of single-field inflation. The mechanisms we consider include a transition into a ghost-inflation-like phase and scenarios where an exponentially growing mode is temporarily turned on. In the cases we discuss, the enhancement in the power spectrum results from either a swift change in some effective coupling or a modification of the dispersion relation for the perturbations, while the background evolution remains unchanged and approximately de Sitter throughout inflation. The robustness of the results is guaranteed thanks to a weakly broken galileon symmetry, which protects the effective couplings against large quantum corrections. We discuss how the enhancement of the power spectrum is related to the energy scale of the operators with weakly broken galileon invariance, and study the limits imposed by strong coupling and the validity of the perturbative expansion.

Some sentences rephrased for clarity

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Cited by in corpus (30)

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• No-go for the formation of heavy mass Primordial Black Holes in Single Field Inflation
• Primordial non-Gaussianity from ultra slow-roll Galileon inflation
• Scalar induced gravity waves from ultra slow-roll Galileon inflation
• The Open Effective Field Theory of Inflation
• Primordial non-Gaussianity as a saviour for PBH overproduction in SIGWs generated by Pulsar Timing Arrays for Galileon inflation
• Realisation of the ultra-slow roll phase in Galileon inflation and PBH overproduction
• Large fluctuations and Primordial Black Holes
• Generation of primordial black holes from an inflation model with modified dispersion relation
• Obviating PBH overproduction for SIGWs generated by Pulsar Timing Arrays in loop corrected EFT of bounce
• Inflation with $0\le c_{\mathrm{s}}\le 1$
• Induced Gravitational Waves from Multi-Sound Speed Resonances during Cosmological Inflation
• Scalar-Induced Gravitational Waves from Ghost Inflation and Parity Violation
• Sudden braking and turning with a two-field potential bump: primordial black hole formation
• Regularized-Renormalized-Resummed loop corrected power spectrum of non-singular bounce with Primordial Black Hole formation
• Growth of power spectrum due to decrease of sound speed during inflation
• Untangling PBH overproduction in $w$-SIGWs generated by Pulsar Timing Arrays for MST-EFT of single field inflation
• Resonant amplification of curvature perturbations in inflation model with periodical derivative coupling
• Primordial Black Holes from Effective Field Theory of Stochastic Single Field Inflation at NNNLO
• Negative non-Gaussianity as a salvager for PBHs with PTAs in bounce
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• Loops in inflation with strongly non-geodesic motion
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• Primordial gravitational waves from excited states
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