Constraining Non-thermal Dark Matter by CMB

Abstract

A period of early matter domination can give rise to the correct dark matter abundance for a broad range of dark matter annihilation rate $⟨{\sigma }_{\mathrm{ann}}v{⟩}_{\mathrm{f}}$. Here, we examine this scenario for situations where $⟨{\sigma }_{\mathrm{ann}}v{⟩}_{\mathrm{f}}$ is below the nominal value for thermal dark matter $3\times 10^{-26}$ cm${}^3$ s${}^{-1}$ as possibly indicated by some recent experiments. We show that obtaining the correct relic abundance sets a lower bound on the duration of early matter domination era in this case. On the other hand, provided that the post-inflationary universe has an equation of state characterized by $w\le 1/3$, the requirement that the scalar spectral index $n_s$ be within the observationally allowed range limits the duration of this epoch from above. By combining these considerations, we show that the current and future cosmic microwave background experiments can tightly constrain the parameter space for this scenario. In particular, models of inflation with a tensor-to-scalar ratio below $\mathcal{O}(0.01)$ may disfavor non-thermal supersymmetric dark matter from a modulus-driven early matter domination epoch.

13 pages, 2 figures, minor changes in the texts in v2 (Published version)

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• Detecting Dark Matter Cores in Galaxy Clusters with Strong Lensing
• Two phase reheating: CMB constraints on inflaton and dark matter phenomenology
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• Gravitational wave signals of dark matter freeze-out
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• Frozen-in fermionic singlet dark matter in non-standard cosmology with a decaying fluid
• Non-thermal moduli production during preheating in $\alpha$-attractor inflation models