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We discuss the impact of charged massive particle big bangnucleosynthesis(CBBN) to explore the nature of the reheating of the Universe inthe case that a new extremely long-lived charged massive particle(CHAMP)exists. If the mass of the CHAMP is within collider reach and it's lifetime islonger than $10^4$sec, the comparison between the CBBN prediction and observed$^6$Li abundances may indicate nonstandard reheating in the early Universewithout relying on details of the decay properties. Even if the CHAMP mass isoutside the reach of colliders, the cosmological considerations may provide anontrivial hint for the existence of such very heavy long-lived CHAMPs from thelate Universe if the daughter particles are the dominant component of thepresent dark matter. We consider a low reheating temperature model as anexample of the nonstandard reheating scenarios.

Extremely Long-Lived Charged Massive Particles as A Probe for Reheating of the Universe