The Relic Problem of String Gas Cosmology

Details The Relic Problem of String Gas Cosmology The Relic Problem of String Gas Cosmology

2009-07-14

arxiv.org/abs/0907.2443v3

Phys.Rev.D80:063518,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, V2 and V3: added references

Scientific paper

10.1103/PhysRevD.80.063518

We discuss the relic problem of string gas cosmology (SGC) using gravitinos and magnetic monopoles as examples. Since SGC operates near or at the Hagedorn temperature, relics are produced copiously; in the absence of dilution, their abundances are too large. A subsequent phase of reheating can solve the gravitino problem, but fails to dilute monopoles sufficiently. We propose a subsequent phase of inflation as the most natural solution to the monopole problem; unfortunately, inflation marginalizes almost all potential achievements of SGC, with the exception of a possible explanation of the dichotomy of space (why did only three dimensions inflate?).

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