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INFLATION FROM IIB SUPERSTRINGS WITH FLUXES

ERANDY RAMÍREZ, TONATIUH MATOS, ISRAEL QUIROS

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We study the conditions needed to have an early epoch of inflationary expansion with a potential coming from type IIB superstring theory with fluxes involving two modulus fields. The phenomenology of this potential is different from the usual hybrid inflation scenario and we analyze the possibility that the system of field equations undergoes a period of inflation in three different regimes with the dynamics modified by a Randall–Sundrum term in the Friedmann equation. We find that the system can produce inflation and, due to the modification of the dynamics, a period of accelerated contraction can follow or precede this inflationary stage, depending on the sign of one of the parameters of the potential. We discuss the viability of this model in a cosmological context.