43 citations · 124 across the 7 of their papers we have counts for
7 papers
Spectator fields and their imprints on the Cosmic Microwave Background
Lingfei Wang
When a subdominant light scalar field ends slow roll during inflation, but well after the Hubble exit of the pivot scales, it may determine the cosmological perturbations. This the…
Detecting CMB modulations and non-Gaussianities from power multipoles
Lingfei Wang
By decomposing the CMB temperature fluctuations \emph{squared} into spherical harmonics, we can define the \emph{CMB power multipoles} as the fundamental observables to quantify an…
CMB dipole asymmetry from a fast roll phase
Anupam Mazumdar, Lingfei Wang
The observed CMB (cosmic microwave background) dipole asymmetry cannot be explained by a single field model of inflation - it inevitably requires more than one field where one of t…
Small non-Gaussianity and dipole asymmetry in the CMB
Lingfei Wang, Anupam Mazumdar
In this paper we provide a prescription for obtaining a small non-Gaussianity and the observed dipole asymmetry in the cosmic microwave background radiation. The observations inevi…
Separable and non-separable multi-field inflation and large non-Gaussianity
Anupam Mazumdar, Lingfei Wang
In this paper we provide a general framework based on formalism to estimate the cosmological observables pertaining to the cosmic microwave background radiation for non-separa…
Preheating and locked inflation: an analytic approach towards parametric resonance
Lingfei Wang
We take an analytic approach towards the framework of parametric resonance and apply it on preheating and locked inflation. A two-scalar toy model is analytically solved for the λϕ…
Bound to bounce: a coupled scalar-tachyon model for a smooth bouncing/cyclic universe
Changhong Li, Lingfei Wang, Yeuk-Kwan E. Cheung
We introduce a string-inspired model for a bouncing/cyclic universe, utilizing the scalar-tachyon coupling as well as contribution from curvature in a closed universe. The universe…