Particle Creation in an Asymmetric Bounce: Unequal Contraction and Expansion

On a cosmological bounce background with a single minimum of the scale factor and unit duration, in units set by that duration, the quantities reported here are obtained by direct numerical evolution of the field modes from the contracting branch to the expanding branch. At wavenumber 1 the asymmetric bounce creates occupation 4.811e-01 against 3.281e-01 for the symmetric bounce, a ratio of 1.466. At wavenumber 0.3 the ratio is 0.458, and at wavenumber 3 it is 218.902. The calculation is performed on a stated model background with stated vacuum conventions, and the code and full-precision output are deposited with the paper. This study is simulated and computed from those assumptions; it is not a measurement.