We critically review the role of cosmological moduli in determining the post-inflationary
history of the universe. Moduli are ubiquitous in string and M-theory constructions of beyond …

We identify a characteristic pattern in the scalar-induced stochastic gravitational wave
background from particle production during inflation. If particle production is sufficiently …

The past two decades have seen transformative advances in cosmology and string theory.
Observations of the cosmic microwave background have revealed strong evidence for …

A bstract We apply the effective field theory approach to quasi-single field inflation, which
contains an additional scalar field with Hubble scale mass other than inflaton. Based on the …

A bstract We identify the effective field theory describing the physics of super-Hubble scales
and show it to be a special case of a class of effective field theories appropriate to open …

The analyticity of response functions and scattering amplitudes implies powerful relations
between low-energy observables and the underlying short-distance dynamics. These …

A bstract Though simple inflationary models describe the CMB well, their corrections are
often plagued by infrared effects that obstruct a reliable calculation of late-time behaviour …

Heavy scalar fields can undergo an instability during inflation as a result of their kinetic
couplings with the inflaton. This is known as the geometrical destabilization of inflation, as it …

We study the effect of massive isocurvaton on density perturbations in quasi-single field
inflation models, when the mass of the isocurvaton M becomes larger than the order of the …

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