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Gravitational waves signatures from dynamical scalar field configurationsprovide a compelling observational window on the early universe. Here weidentify intriguing connections between dark matter and scalars fields thatemit gravitational waves, either through a first order phase transition oroscillating after inflation. To study gravitational waves from first orderphase transitions, we investigate a simplified model consisting of a heavyscalar coupled to a vector and fermion field. We then compute gravitationalwave spectra sourced by inflaton field configurations oscillating after E-Modeland T-Model inflation. Some of these gravitational wave signatures can beuncovered by the future Big Bang Observatory, although in general we find thatMHz-GHz frequency gravitational wave sensitivity will be critical fordiscovering the heaviest dark sectors. Intriguingly, we find that scalarsundergoing phase transitions, along with E-Model and T-Model potentials, canimpel a late-time dark matter mass boost and generate up to Planck mass darkmatter. For phase transitions and oscillating inflatons, the largest darkmatter mass boosts correspond to higher amplitude stochastic gravitational wavebackgrounds.

Gravitational Waves From Dark Sectors, Oscillating Inflatons, and Mass Boosted Dark Matter