978 citations · 8.1k across the 84 of their papers we have counts for
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Unique Fingerprints of Alternatives to Inflation in the Primordial Power Spectrum
Xingang Chen, Abraham Loeb, Zhong-Zhi Xianyu
Massive fields in the primordial universe function as standard clocks and imprint clock signals in the density perturbations that directly record the scale factor of the primordial…
Reconstructing the Inflationary Landscape with Cosmological Data
Xingang Chen, Gonzalo A. Palma, Bruno Scheihing Hitschfeld +1
We show that the shape of the inflationary landscape potential may be constrained by analyzing cosmological data. The quantum fluctuations of fields orthogonal to the inflationary…
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…
Landscape tomography through primordial non-Gaussianity
Xingang Chen, Gonzalo A. Palma, Walter Riquelme +2
In this paper, we show how the structure of the landscape potential of the primordial Universe may be probed through the properties of the primordial density perturbations responsi…
Quantum Standard Clocks in the Primordial Trispectrum
Xingang Chen, Wan Zhen Chua, Yuxun Guo +3
We calculate the primordial trispectrum of curvature perturbation in quasi-single field inflation, with general sound speeds for both the inflaton and the massive scalar. Special a…
Revisiting non-Gaussianity from non-attractor inflation models
Yi-Fu Cai, Xingang Chen, Mohammad Hossein Namjoo +3
Non-attractor inflation is known as the only single field inflationary scenario that can violate non-Gaussianity consistency relation with the Bunch-Davies vacuum state and generat…