14 citations · 25 across the 10 of their papers we have counts for
11 papers
Stochastic gravitational waves from narrow-band cosmological magnetic fields
Abdias Aires, Tatsuya Daniel
We calculate the spectrum of gravitational waves generated by a cosmological magnetic field with a narrow-band power spectrum. For a spectrum narrowly peaked at a comoving wavenumb…
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…
Indirect Parametric Resonance of the Electromagnetic Field Driven by an Oscillating SU(2) Dark Matter Condensate
Tatsuya Daniel, Vahid Kamali, Robert Brandenberger
We study a local patch of an axion-like dark sector in Minkowski spacetime, containing an initially homogeneous and isotropic non-Abelian condensate, and a real pseudoscala…
Branching Universes
Anamaria Hell, Tatsuya Daniel
We propose the idea that our Universe is a realization among different possible branches, which can be observationally tested through the modified dispersion relation of the gravit…
Reheating with Axion-SU(2) and Gravitational Chern-Simons Couplings
Tatsuya Daniel, Vahid Kamali
We study the early stages of an oscillatory reheating phase in an inflaton plus spectator axion-SU(2) system, including both an axion-gauge Chern-Simons coupling and…
Beyond general relativity: gravitational waves in non-minimally coupled theories
Stephon Alexander, Tatsuya Daniel, Tucker Manton
Non-minimal couplings between matter and curvature tensors arise in many different contexts. Such couplings modify solutions of general relativity (GR) and therefore can be probed…
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…
An SZ-Like Effect on Cosmological Gravitational Wave Backgrounds
Tatsuya Daniel, Marcell Howard, Morgane König
Cosmological gravitational wave backgrounds (CGWBs) are the conglomeration of unresolved gravitational wave signals from early Universe sources, which make them a promising tool fo…
Spacetime geometry of acoustics and electromagnetism
Lucas Burns, Tatsuya Daniel, Stephon Alexander +1
Both acoustics and electromagnetism represent measurable fields in terms of dynamical potential fields. Electromagnetic force-fields form a spacetime bivector that is represented b…
An Exact Fermionic Chern-Simons-Kodama State in Quantum Gravity
Stephon Alexander, Tatsuya Daniel, Marcell Howard +1
The Chern-Simons-Kodama (CSK) state is an exact, non-perturbative wave function in the Ashtekar formulation of classical General Relativity. In this work, we find a generalized fer…
The Ashtekar Variables and a Varying Cosmological Constant from Dynamical Chern-Simons Gravity
Stephon Alexander, Tatsuya Daniel, Joao Magueijo
We revisit the Kodama state by quantizing the theory of General Relativity (GR) with dynamical Chern-Simons (dCS) gravity. We find a new exact solution to the Wheeler-DeWitt equati…