147 citations · 1.1k across the 30 of their papers we have counts for
7 papers · 1 filter
Non-Gaussianity in rapid-turn multi-field inflation
Oksana Iarygina, M. C. David Marsh, Gustavo Salinas
We show that theories of inflation with multiple, rapidly turning fields can generate large amounts of non-Gaussianity. We consider a general theory with two fields, an arbitrary f…
Local, algebraic simplifications of Gaussian random fields
Theodor Bjorkmo, M. C. David Marsh
Many applications of Gaussian random fields and Gaussian random processes are limited by the computational complexity of evaluating the probability density function, which involves…
Manyfield Inflation in Random Potentials
Theodor Bjorkmo, M. C. David Marsh
We construct models of inflation with many randomly interacting fields and use these to study the generation of cosmological observables. We model the potentials as multi-dimension…
Seven Lessons from Manyfield Inflation in Random Potentials
Mafalda Dias, Jonathan Frazer, M. C. David Marsh
We study inflation in models with many interacting fields subject to randomly generated scalar potentials. We use methods from non-equilibrium random matrix theory to construct the…
Exacerbating the cosmological constant problem with interacting dark energy
M. C. David Marsh
Future cosmological surveys will probe the expansion history of the universe and constrain phenomenological models of dark energy. Such models do not address the fine-tuning proble…
Simple emergent power spectra from complex inflationary physics
Mafalda Dias, Jonathan Frazer, M. C. David Marsh
We construct ensembles of random scalar potentials for interacting scalar fields using non-equilibrium random matrix theory, and use these to study the generation of observab…
Searching for a 0.1-1 keV Cosmic Axion Background
Joseph P. Conlon, M. C. David Marsh
Primordial decays of string theory moduli at z \sim 10^{12} naturally generate a dark radiation Cosmic Axion Background (CAB) with 0.1 - 1 keV energies. This CAB can be detected th…