This work compares cosmological matching conditions used in approximating
generic pre-inflationary phases of the universe. We show that the joining
conditions for primordial scalar perturbations assumed by Contaldi et al. are
inconsistent with the physically motivated Israel junction conditions, however,
performing general relativistic matching with the aforementioned constraints
results in unrealistic primordial power spectra. Eliminating the need for
ambiguous matching, we look at an alternative semi-analytic model for producing
the primordial power spectrum allowing for finite duration cosmological phase
transitions.Comment: 21 pages, 10 figures. To be submitted to PR