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Interaction between two dark matter (DM) components plays a crucial role in DM production, dynamics and phenomenology in multicomponent DM scenarios. We propose and study a new kind of DM called pseudo-FIMP (pFIMP), which can be realised in a multicomponent DM setup. pFIMP is feebly connected to the visible sector but remains in thermal equilibrium by sufficient interaction with a thermal DM partner before freezing out to achieve under abundance. Although it has no direct connection with the visible sector, pFIMP comes under the detector scanner via the thermal DM loop. Here, we discuss the dynamics of pFIMP and its loop-induced detection possibilities in the presence of a thermal DM when both are rendered stable under \(\mathbb {Z}_2\otimes \mathbb {Z}_2^{\prime }\) symmetry. However, under a single discrete symmetry, a heavy dark sector particle becomes a long-lived particle (LLP) DM when the lifetime is enhanced to that compared to the age of the universe, and can provide a WIMP-pFIMP set up. This provides a rich phenomenology and larger available parameter space for future DM detections. We explore this possibility for \(\mathbb {Z}_3\) symmetry.

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The Dynamics and Detection Possibility of a Pseudo-FIMP in Presence of a Thermal Dark Matter Component

  • 会议论文

  • 发表日期：

    2025年

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  • Subhaditya Bhattacharya,
  • Lipika Kolay,
  • Jayita Lahiri,
  • Dipankar Pradhan

摘要

Interaction between two dark matter (DM) components plays a crucial role in DM production, dynamics and phenomenology in multicomponent DM scenarios. We propose and study a new kind of DM called pseudo-FIMP (pFIMP), which can be realised in a multicomponent DM setup. pFIMP is feebly connected to the visible sector but remains in thermal equilibrium by sufficient interaction with a thermal DM partner before freezing out to achieve under abundance. Although it has no direct connection with the visible sector, pFIMP comes under the detector scanner via the thermal DM loop. Here, we discuss the dynamics of pFIMP and its loop-induced detection possibilities in the presence of a thermal DM when both are rendered stable under \(\mathbb {Z}_2\otimes \mathbb {Z}_2^{\prime }\) symmetry. However, under a single discrete symmetry, a heavy dark sector particle becomes a long-lived particle (LLP) DM when the lifetime is enhanced to that compared to the age of the universe, and can provide a WIMP-pFIMP set up. This provides a rich phenomenology and larger available parameter space for future DM detections. We explore this possibility for \(\mathbb {Z}_3\) symmetry.