Understand
We investigate the structure of gravitational self-interactions of coherently oscillating axions in the general relativistic framework.
- A generic action for a massive scalar field in the Friedmann-Robertson-Walker background is first introduced based on the effective field theory approach to cosmological perturbations.
- Using the obtained setup, we evaluate the effective gravitational interaction of the massive scalar field, i.e.
- scalar quartic interactions mediated by metric perturbations.
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