Gravitino Production from Heavy Moduli Decay and Cosmological Moduli Problem Revived
By Shuntaro Nakamura, M. Yamaguchi. 2006
198 citations recorded by the source corpus.
Abstract The cosmological moduli problem for relatively heavy moduli fields is reinvestigated. For this purpose we examine the decay of a modulus field at a quantitative level. The modulus dominantly decays into gauge bosons and gauginos, provided that the couplings among them are not suppressed in the gauge kinetic function. Remarkably the modulus decay into a gravitino pair is unsuppressed generically, with a typical branching ratio of order 0.01. Such a large gravitino yield after the modulus decay causes cosmological difficulties. The constraint from the big-bang nucleosynthesis pushes up the gravitino mass above 10 5 GeV . Furthermore to avoid the over-abundance of the stable neutralino lightest superparticles (LSPs), the gravitino must weigh more than about 10 6 GeV for the wino-like LSP, and even more for other neutralino LSPs. This poses a stringent constraint on model building of low-energy supersymmetry.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/ea0ed32e4988e1254ea1636d03a311a4a8b8f1e7
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Citations in the corpus
- In wino veritas? Indirect searches shed light on neutralino dark matter (2013, background): “Another possible problem is that moduli heavy relative to m3/2 will decay to gravitinos, potentially creating a moduli-induced gravitino problem [25, 76, 77].”
- Non-Thermal Dark Matter and the Moduli Problem in String Frameworks (2008, background): “In supersymmetric extensions of the standard model, the overproduction of gravitinos can cause similar problems and have been a source of much investigation [6–19].”