7 papers
Quantum Gravity, de Sitter Space, and Normalizability
Stephon Alexander, Heliudson Bernardo, Jacob Kuntzleman +1
We propose a resolution to the longstanding problem of perturbative normalizability in canonical quantum gravity of the Lorentzian Chern-Simons-Kodama (CSK) state with a positive c…
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…
Can weak-gravity, causality-violation arguments constrain modified gravity?
Stephon Alexander, Heliudson Bernardo, Nicolás Yunes
We investigate limitations of causality arguments from flat-spacetime amplitudes, based on the eikonal limit of gravitational scattering, to place constraints on modified gravity.…
Perturbations in pseudo-Nambu-Goldstone Higgs Inflation
Stephon Alexander, Humberto Gilmer, Cooper Niu
Pseudo-Nambu-Goldstone (pNG) Higgs Inflation is a novel approach to relate the Higgs boson and its interaction with Electroweak gauge bosons with cosmic inflation, with the potenti…
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…