Abstract. A generic feature of string compactifications is the presence of many scalar fields, called moduli. Moduli are usually displaced from their post-inflationary minimum during inflation. Their relaxation to the minimum could lead to the production of oscillons: long-lived non-linear excitations of the scalar fields. One interesting consequence of oscillon dynamics is the production of gravitational waves.
In this talk I survey under which conditions oscillons can be produced in string cosmology, and I will illustrate their production and potential phenomenology with two explicit examples: the case of an initially displaced volume modulus in the KKLT scenario and of an initially displaced blow-up modulus in the LVS.
ICTP - Strada Costiera, 11
I - 34151 Trieste Italy (+39) 040 2240 111 firstname.lastname@example.org