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Primordial black holes in non-Gaussian regimes
Sam Young, Christian T. Byrnes
Primordial black holes (PBHs) can form in the early Universe from the collapse of rare, large density fluctuations. They have never been observed, but this fact is enough to constr…
A test of the Suyama-Yamaguchi inequality from weak lensing
Alessandra Grassi, Lavinia Heisenberg, Chris T. Byrnes +1
We investigate the weak lensing signature of primordial non-Gaussianities of the local type by constraining the magnitude of the weak convergence bi- and trispectra expected for th…
Implications of the Planck bispectrum constraints for the primordial trispectrum
Christian T. Byrnes, Sami Nurmi, Gianmassimo Tasinato +1
The new Planck constraints on the local bispectrum parameter fnl are about 10^5 times tighter than the current constraints on the trispectrum parameter gnl, which means that the al…
Influence of Reheating on the Trispectrum and its Scale Dependence
Godfrey Leung, Ewan R. M. Tarrant, Christian T. Byrnes +1
We study the evolution of the non-linear curvature perturbation during perturbative reheating, and hence how observables evolve to their final values which we may compare against o…
A non-Gaussian landscape
Sami Nurmi, Christian T. Byrnes, Gianmassimo Tasinato
Primordial perturbations with wavelengths greater than the observable universe shift the effective background fields in our observable patch from their global averages over the inf…