52 citations · 359 across the 35 of their papers we have counts for
28 papers · 1 filter
Fermionic cosmic strings in dynamical Chern-Simons gravity
Stephon Alexander, Heliudson Bernardo, Shengyuan Zhang
We investigate topological defects produced by a chiral phase transition in a fermionic ultraviolet completion of dynamical Chern-Simons (dCS) gravity. The model contains a complex…
Four-Fermion Condensates in Curved Spacetimes: A Functional Approach
Stephon Alexander, Heliudson Bernardo, Jiatong Yan
Four-fermion interactions appear in effective descriptions of particle physics, many-body systems, and gravitational theories with fermions. Although the same local operator may en…
Coherent states versus Glauber-Sudarshan States: Bootstrapping, Schwinger-Keldysh Contours and Lefschetz Thimbles
Heliudson Bernardo, Tatsuya Daniel, Keshav Dasgupta +3
We investigate how, in a highly constrained system such as a four-dimensional diffeomorphism-invariant theory with vanishing bulk Hamiltonian and non-trivial interactions between t…
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…
Heterotic Warm Inflation
Arjun Berera, Heliudson Bernardo, Suddhasattwa Brahma +3
We propose a two-field model of warm inflation motivated by a heterotic string construction, involving an axion and a dilaton-like scalar field with non-trivial kinetic mixing. Gau…
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.…