Moduli and graviton production during moduli stabilization

In theories beyond the Standard Model, in particular in theories with extra spatial dimensions such as superstring theory, there are a large number of scalar fields which appear in the low energy effective action. These moduli fields must be stabilized. Often, moduli stabilization involves a stage during which the moduli fields oscillate coherently about their ground state value. Here, we study moduli and graviton production during the period during which the background modulus field is oscillating, assuming that this period takes place in the radiation phase. We find a resonant production of moduli fluctuations, and a tachyonic instability to the generation of long wavelength gravitational waves. As a consequence, the period of moduli stabilization is short on a Hubble time scale.

Automated summary

In theories beyond the Standard Model, stabilization of a large number of scalar fields, including moduli fields, is necessary. A study found resonant production of moduli fluctuations and a tachyonic instability leading to the generation of long wavelength gravitational waves during the period when the background modulus field is oscillating. Consequently, the period of moduli stabilization is short on a Hubble time scale.