5 papers · 1 filter
Impact of Scale-dependent Primordial Non-Gaussianity on Scalar-induced Gravitational Waves
Alisha Marriott-Best, Devanshu Sharma, Anish Ghoshal +1
Scalar-induced gravitational waves (SIGWs) probe primordial curvature perturbations beyond cosmic microwave background scales, while primordial black holes (PBHs) probe the rare ta…
Robust μ-distortion constraints on primordial supermassive black holes from cubic (gNL) non-Gaussian perturbations
Xavier Pritchard, Christian T. Byrnes, Julien Lesgourgues +1
We make the first calculation of the spectral distortion constraints on the primordial curvature power spectrum in the limit of large cubic non-Gaussianity. This calculation involv…
Stochastic inflation and non-perturbative power spectrum beyond slow roll
Devanshu Sharma
Stochastic inflation, together with the formalism, provides a powerful tool for estimating the large-scale behaviour of primordial fluctuations. In this work, we develop a nu…
Robust -distortion constraints on primordial supermassive black holes from non-Gaussian perturbations
Christian T. Byrnes, Julien Lesgourgues, Devanshu Sharma
Explaining the origin of supermassive black holes via a primordial origin is severely challenged by the tight spectral distortion constraints on the amplitude of the primordial per…
Spectral distortions from acoustic dissipation with non-Gaussian (or not) perturbations
Devanshu Sharma, Julien Lesgourgues, Christian T. Byrnes
A well-known route to form primordial black holes in the early universe relies on the existence of unusually large primordial curvature fluctuations, confined to a narrow range of…