173 citations · 766 across the 17 of their papers we have counts for
8 papers · 1 filter
Parity Violation from Emergent Non-Locality During Inflation
Sadra Jazayeri, Sébastien Renaux-Petel, Xi Tong +2
Parity violation in the early universe holds great promise for uncovering new physics. In particular, the primordial scalar four-point correlation function is allowed to develop a…
BCS in the Sky: Signatures of Inflationary Fermion Condensation
Xi Tong, Yi Wang, Chen Zhang +1
We consider a Bardeen-Cooper-Schrieffer (BCS)-like model in the inflationary background. We show that with an axial chemical potential, the attractive quartic fermion self-interact…
Cutting Rule for Cosmological Collider Signals: A Bulk Evolution Perspective
Xi Tong, Yi Wang, Yuhang Zhu
We show that the evolution of interacting massive particles in the de Sitter bulk can be understood at leading order as a series of resonant decay and production events. From this…
Chemical-Potential-Assisted Particle Production in FRW Spacetimes
Chon Man Sou, Xi Tong, Yi Wang
We analyze gravitational particle production assisted by chemical potential. By utilizing the uniformly smoothed Stokes-line method and Borel summation, we gain insight into the fi…
A Bit Rate Bound on Superluminal Communication
Xi Tong, Yi Wang, Yuhang Zhu
We study semi-classical communication in positivity-violating k-essence scalar field theories, with superluminal modes propagating on a rolling background. The self-interactions du…
Gauge Invariance, Polar Coordinates and Inflation
Ali Akil, Xi Tong
We point out the necessity of resolving the apparent gauge dependence in the quantum corrections of cosmological observables for Higgs-like inflation models. We highlight the fact…
Connections between Minkowski and Cosmological Correlation Functions
Shek Kit Chu, Mang Hei Gordon Lee, Shiyun Lu +3
We show how cosmological correlation functions of massless fields can be rewritten in terms of Minkowski correlation functions, by extracting symmetry-breaking operators from the c…
Warm Quasi-Single Field Inflation
Xi Tong, Yi Wang, Siyi Zhou
We study quasi-single field inflation with a warm inflation background. The thermal effects at small scales can sufficiently enhance the magnitude of the primordial standard clock…