Quark matter and cosmology
Abstract
The possible implications of the quarkhadron transition for cosmology are explored. Possible surviving signatures are discussed. In particular, the possibility of generating a dark matter candidate such as strange nuggets or planetary mass black holes is noted. Much discussion is devoted to the possible role of the transition for cosmological nucleosynthesis. It is emphasized that even an optimized first order phase transition will not significantly alter the nucleosynthesis constraints on the cosmological baryon density nor on neutrino counting. However, it is noted that Be and B observations in old stars may eventually be able to be a signature of a cosmologically significant quarkhadron transition. It is pointed out that the critical point in this regard is whether the observed B/Be ratio can be produced by spallation processes or requires cosmological input. Spallation cannot produce a B/Be ratio below 7.6. A supporting signature would be Be and B ratios to oxygen that greatly exceed galactic values. At present, all data is still consistent with a spallagenic origin.
 Publication:

Presented at the Quark Matter 1991
 Pub Date:
 January 1992
 Bibcode:
 1992quma.rept...11S
 Keywords:

 Black Holes (Astronomy);
 Cosmology;
 Dark Matter;
 Neutrinos;
 Quarks;
 Spallation;
 B Stars;
 Baryons;
 Critical Point;
 Nuclear Fusion;
 Planetary Mass;
 Astrophysics