6 papers
Graviton Production from Inflaton Condensate: Boltzmann vs Bogoliubov
Chenhuan Wang, Yong Xu, Wenbin Zhao
We study graviton production from an oscillating inflaton condensate during reheating by systematically comparing Boltzmann and Bogoliubov descriptions for inflaton potentials of t…
An EFT Map of Axion Dark Radiation from Reheating
Yong Xu
Light, weakly coupled sectors can retain information about the cosmological background in which they are produced. We study light axions produced during reheating and their contrib…
Sampling the Graviton Pole and Deprojecting the Swampland
Guangzhuo Peng, Laurentiu Rodina, Anna Tokareva +1
We develop a primal bootstrap framework for effective field theories in the presence of a graviton pole, based on finite-resolution sampling rather than smearing, while also allowi…
Full-Spectrum Analysis of Gravitational Wave Production from Inflation to Reheating
Xun-Jie Xu, Yong Xu, Qiqin Yin +1
In this work, we systematically study gravitational wave (GW) production during both the inflationary and post-inflationary epochs. While inflationary GWs can be readily derived fr…
Refined Predictions for Starobinsky Inflation and Post-inflationary Constraints in Light of ACT
Manuel Drees, Yong Xu
Recent measurements from the Atacama Cosmology Telescope (ACT), combined with Planck and DESI data, suggest a higher value for the spectral index . This places Starobinsky inf…
Graviton- and Inflaton-mediated Dark Matter Production after Large Field Polynomial Inflation
Nicolás Bernal, Julia Harz, Martin A. Mojahed +1
Polynomial inflation is a simple cosmological scenario, which fits the cosmic microwave background data well. It provides testable predictions for the tensor-to-scalar ratio and th…