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# Towards a holographic description of cosmology: Renormalisation of the energy-momentum tensor of the dual QFT

Lee, Joseph K. L., Debbio, Luigi Del, Jüttner, Andreas, Portelli, Antonin and Skenderis, Kostas (2020) Towards a holographic description of cosmology: Renormalisation of the energy-momentum tensor of the dual QFT. PoS.

Record type: Article

## Abstract

In the holographic approach to cosmology, cosmological observables are described in terms of correlators of a three-dimensional boundary quantum field theory. As a concrete model, we study the 3$d$ massless $SU(N)$ scalar matrix field theory. In this work, we focus on the renormalisation of the energy-momentum tensor 2-point function, which can be related to the CMB power spectra. Here we present a non-perturbative procedure to remove divergences resulting from the loss of translational invariance on the lattice, by imposing Ward identities. This will allow us to make predictions for the CMB power spectra in the regime where the dual QFT is non-perturbative.

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1909.13867v1 - Version of Record
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Submitted date: 30 September 2019
Published date: 27 August 2020
Additional Information: 7 pages, 2 figures, presented at the 37th International Symposium on Lattice Field Theory - LATTICE2019 - 16-22 June, 2019, Wuhan, China
Venue - Dates: 37th International Symposium on Lattice Field Theory, Wuhan, Wuhan, China, 2019-06-16 - 2019-06-22
Keywords: hep-lat, hep-th

## Identifiers

Local EPrints ID: 448601
URI: http://eprints.soton.ac.uk/id/eprint/448601
PURE UUID: 8cea35c9-b67f-484a-ba6e-6c169630686f
ORCID for Andreas Jüttner: orcid.org/0000-0002-3978-0927
ORCID for Antonin Portelli: orcid.org/0000-0002-6059-917X
ORCID for Kostas Skenderis: orcid.org/0000-0003-4509-5472

## Catalogue record

Date deposited: 28 Apr 2021 16:30

## Contributors

Author: Joseph K. L. Lee
Author: Luigi Del Debbio
Author: Antonin Portelli

## University divisions

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