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Centro de Astrofísica da Universidade do Porto
22-26 August 2011, Porto, Portugal

 

On Testing Superstring Theories with Gravitational Waves
Hasenkamp, Jasper (Hamburg U.)

We provide a simple transfer function that considers the impact of an early matter dominated era on the gravitational wave background and show that a large class of string theories might be tested by observations of the gravitational wave background from inflation. For large enough reheating temperatures, e.g., > 10^9 GeV the test applies to all theories containing at least one scalar with mass < 3 × 10^12 GeV that aquires a large initial oscillation amplitude after inflation and interacts only with gravitational strength; like moduli.