Kavli Affiliate: Joshua Frieman
| First 5 Authors: Ryn Grutkoski, Hayley J. Macpherson, John T. Giblin Jr, Joshua Frieman,
| Summary:
We use numerical relativity to study the violent preheating era at the end of
inflation. This epoch can result in highly nonlinear fluctuations in density
and gravitational potential which feed back onto the averaged expansion rate —
an effect known as backreaction. Usually, simulations of preheating use the
Friedmann constraint to enforce the Hubble expansion of spacetime during the
evolution. In numerical relativity, this is not required and the inhomogeneous
spacetime is evolved self-consistently. For a ‘vanilla’ preheating model, we
find a violation of the Friedmann constraint at the level of $0.005%$ over the
entire simulation. This violation increases to $sim10%$ as we sample smaller
scales in the simulation domain.
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