WIMPs during reheating

Abstract Weakly Interacting Massive Particles (WIMPs) are among the best-motivated dark matter candidates. In standard scenario where freeze-out happens well after end of inflationary reheating, they in tension with severe experimental constraints. Here, we investigate thermal WIMPs occurring during while inflaton ϕ coherently oscillates a generic potential ∝ n . Depending on value and spin decaying products, evolution radiation energy densities can show distinct features, therefore, having considerable impact behavior WIMPs. As result injection entropy parameter space compatible observed DM relic abundance is enlarged. particular, WIMP thermally averaged annihilation cross-section be several magnitudes lower than that case. Finally, discuss current bounds from indirect detection experiments, explore future challenges opportunities.