14 citations · 17 across the 17 of their papers we have counts for
6 papers · 1 filter
Hybrid Inflation from Fermion Condensate
Stephon Alexander, Pisin Chen, Jinglong Liu +3
We investigate how inflation can emerge from four-fermion interactions generated by spacetime torsion, eliminating the need for additional scalar fields beyond the Standard Model.…
The Cosmological Constant from a Quantum Gravitational -Vacua and the Gravitational Hall Effect
Stephon Alexander, Heliudson Bernardo, Aaron Hui
We provide a new perspective on the cosmological constant by exploring the background-independent Wheeler-DeWitt quantization of general relativity. The Chern-Simons-Kodama state o…
Birefringence in fermion-attenuated gravitational wave power spectrum
Jinglong Liu, Stephon Alexander, Antonino Marciano
Within the framework of Chern-Simons gravity, a theory that dynamically violates parity, we analyze the power spectrum of gravitational waves in light of the damping effect due to…
Vacuum Amplification of Chiral Gravitational Waves and the Stochastic Gravitational Wave Background
Stephon Alexander, Heliudson Bernardo, Yiya Selina Li +1
We investigate cosmological vacuum amplification of gravitational waves in dynamical Chern-Simons gravity. We develop a comprehensive framework to compute graviton production induc…
Gravitational Waves in Chern-Simons-Gauss-Bonnet Gravity
Tatsuya Daniel, Leah Jenks, Stephon Alexander
It is known that the four-dimensional effective field theory arising from heterotic string theory is general relativity with both a Chern-Simons and Gauss-Bonnet term. We study the…
A Realist Interpretation of Unitarity in Quantum Gravity
Indrajit Sen, Stephon Alexander, Justin Dressel
Unitarity is a difficult concept to implement in canonical quantum gravity because of state non-normalizability and the problem of time. We take a realist approach based on pilot-w…