PhD project: Holographic cosmological models

Project description

The recent work arXiv:1607.04878 showed that a holographic description of the early Universe allows one to obtain novel cosmological models, which are competitive with the more standard ΛCDM model. In this new model, the Cosmic Microwave Background (CMB) spectrum is related to the 2-point function of the trace of the energy-momentum tensor in the dual theory. The fit to data suggests that the dual theory is a gauge theory coupled to scalar fields with a quartic interaction, which while perturbative at high momenta, it becomes non-perturbative at low momenta (low-multipole part of the CMB spectrum). Moreover, the dual theory suffers from severe infrared divergences in perturbation theory, which are believed to be only an artefact of perturbation theory. In this project, we propose to address both issues by computing the relevant 2-point functions in dual theory using fully non-perturbative lattice simulations.

This project is supported by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme under grant agreement No 757646 "Search for new physics through lattice simulations". Through this funding there is limited support for a non-EU scholarship specifically for this project.

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