978 citations · 8.1k across the 84 of their papers we have counts for
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New inflationary probes of axion dark matter
Xingang Chen, JiJi Fan, Lingfeng Li
If a light axion is present during inflation and becomes part of dark matter afterwards, its quantum fluctuations contribute to dark matter isocurvature. In this article, we introd…
Snowmass Theory Frontier: Astrophysics and Cosmology
Daniel Green, Joshua T. Ruderman, Benjamin R. Safdi +84
We summarize progress made in theoretical astrophysics and cosmology over the past decade and areas of interest for the coming decade. This Report is prepared as the TF09 "Astrophy…
Classical Cosmological Collider Physics and Primordial Features
Xingang Chen, Reza Ebadi, Soubhik Kumar
Features in the inflationary landscape can inject extra energies to inflation models and produce on-shell particles with masses much larger than the Hubble scale of inflation. This…
Neutrino Signatures in Primordial Non-Gaussianities
Xingang Chen, Yi Wang, Zhong-Zhi Xianyu
We study the cosmological collider phenomenology of neutrinos in an effective field theory. The mass spectrum of neutrinos and their characteristic oscillatory signatures in the sq…
Decaying Hidden Dark Matter in Warped Compactification
Xingang Chen
The recent PAMELA and ATIC/Fermi/HESS experiments have observed an excess of electrons and positrons, but not anti-protons, in the high energy cosmic rays. To explain this result,…