The inflationary origin of the cold spot anomaly

Speaker: Juan Carlos Bueno-Sánchez, Universidad del Valle, Santiago de Cali. Colombia

Speaker arrival: 21/01/2014

Speaker departure: 24/01/2014

Assigned office: 23

Title: The inflationary origin of the cold spot anomaly

Place: Seminario Dpto. Física Teórica y del Cosmos

Date: 23/01/2014

Time: 16:00

Abstract:
Single-field inflation, arguably the simplest and most compelling paradigm for the origin of our Universe, is stronglyvsupported by the recent results of the Planck satellite. Such results, however, also confirm the presence of a number of anomalies whose origin constitutes a challenge for single-field inflation. Among the most prominent and tested of these anomalies is the Cold Spot; a large region of the Cosmic Microwave Background sky with a significant temperature decrement. To explain its origin within single-field inflation, in this talk I introduce the Localized Inhomogeneous Reheating (LIR) hypothesis, which postulates the existence of a coupled scalar field able to modify the decay of the inflaton. I will argue that, provided the model parameters are appropriately tuned, the LIR hypothesis offers a viable explanation of the Cold Spot anomaly.