Speaker
Jai-chan Hwang
Description
We investigate aspects of axion as a coherently oscillating massive classical scalar field
by analyzing the fully nonlinear order perturbations in Einstein's gravity in the axion-comoving gauge.
The axion fluid has its characteristic pressure term leading to an axion Jeans scale
which is cosmologically negligible for a canonical axion mass.
Our classically derived axion pressure term in Einstein's gravity is identical to the one derived
in the non-relativistic quantum mechanical context in the literature.
We present the general relativistic energy and momentum conservation equations
for an axion fluid valid up to fully nonlinear order in perturbation.
Author
Co-authors
Prof.
Chan-Gyung Park
(Jeonbuk National University)
Dr
Hyerim Noh
(Korea Astronomy and Space Science Institute)
