Top-Down Models and UHECRs - rencontres de blois
Top-Down Models and UHECRs - rencontres de blois
Top-Down Models and UHECRs - rencontres de blois
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Gravitational creation of superheavy matter<br />
Small fluctuations of field Φ obey<br />
¨φ k + [ k 2 +m 2 eff(τ) ] φ k = 0<br />
If m eff is time <strong>de</strong>pen<strong>de</strong>nt, vacuum fluctuations will be<br />
transformed into real particles.<br />
⇒ expansion of Universe,<br />
m 2 eff = M 2 a 2 +(6ξ −1) a′′<br />
a<br />
leads to particle production<br />
Rencontres <strong>de</strong> Blois 2008 Michael Kachelrieß <strong>Top</strong>-<strong>Down</strong> <strong>Mo<strong>de</strong>ls</strong>
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