Publications (28)
Dynamics with Infinitely Many Derivatives: The Initial Value Problem
Neil Barnaby, Niky Kamran
Differential equations of infinite order are an increasingly important class of equations in theoretical physics. Such equations are ubiquitous in string field theory and have rece…
On Features and Nongaussianity from Inflationary Particle Production
Neil Barnaby
Interactions between the inflaton and any additional fields can lead to isolated bursts of particle production during inflation (for example from parametric resonance or a phase tr…
Nongaussianity from Tachyonic Preheating in Hybrid Inflation
Neil Barnaby, James M. Cline
In a previous work we showed that large nongaussianities and nonscale-invariant distortions in the CMB power spectrum can be generated in hybrid inflation models, due to the contri…
Phenomenology of a Pseudo-Scalar Inflaton: Naturally Large Nongaussianity
Neil Barnaby, Ryo Namba, Marco Peloso
Many controlled realizations of chaotic inflation employ pseudo-scalar axions. Pseudo-scalars Ïare naturally coupled to gauge fields through c ÏF \tilde{F}. In the presence of th…
Nonlocal Inflation
Neil Barnaby
We consider the possibility of realizing inflation in nonlocal field theories containing infinitely many derivatives. Such constructions arise naturally in string field theory and…
Nongaussianity from Particle Production During Inflation
Neil Barnaby
In a variety of models the motion of the inflaton may trigger the production of some non-inflaton particles during inflation, for example via parametric resonance or a phase transi…