Cosmological abundance of colored relics

Preprint number: CP3-Origins-2018-34 DNRF90
Authors: Christian Gross (INFN, Sezioni di Pisa, Italy), Andrea Mitridate (INFN, Sezioni di Pisa, Italy), Michele Redi (INFN, Sezione di Firenze), Juri Smirnov (CP3-Origins & DIAS), and Alessandro Strumia (INFN, Sezioni di Pisa)

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The relic cosmological abundance of stable or long-lived neutral
colored particles gets reduced by about 5 orders of magnitude
by annihilations that occur after QCD confinement.
We compute the abundance and the cosmological bounds on relic gluinos.
The relic abundance of charged colored particles, such as a stop, is less significantly affected.
The same post-confinement
effect strongly enhances co-annihilatinos with a lighter Dark Matter particle, provided
that their mass difference is below a few GeV.