Successful Freeze-Out of Strongly Interacting Dark Matter with Even-Numbered Interactions,Physical Review Letters

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Successful Freeze-Out of Strongly Interacting Dark Matter with Even-Numbered Interactions
Physical Review Letters ( IF 8.1 ) Pub Date : 2024-07-12 , DOI: 10.1103/physrevlett.133.021003
Xiaoyong Chu _{1,

2} , Marco Nikolic _{1,

3} , Josef Pradler _{1,

3}

Affiliation

Strongly interacting massive particles

π

have been advocated as prominent dark matter candidates when they regulate their relic abundance through odd-numbered

3 π \to 2 π

annihilation. We show that successful freeze-out may also be achieved through even-numbered interactions

X X \to π π

once bound states

X

among the particles of the low-energy spectrum exist. In addition,

X

-formation hosts the potential of also catalyzing odd-numbered

3 π \to 2 π

annihilation processes, turning them into effective two-body processes

π X \to π π

. Bound states are often a natural consequence of strongly interacting theories. We calculate the dark matter freeze-out and comment on the cosmic viability and possible extensions. Candidate theories can encompass confining sectors without a mass gap, glueball dark matter, or