From Planck data to Planck era: Observational tests of Holographic Cosmology

Abstract

We test a class of holographic models for the very early universe against cosmological observations and find that they are competitive to the standard $\Lambda$CDM model of cosmology. These models are based on three dimensional perturbative super-renormalizable Quantum Field Theory (QFT), and while they predict a different power spectrum from the standard power-law used in $\Lambda$CDM, they still provide an excellent fit to data (within their regime of validity). By comparing the Bayesian evidence for the models, we find that $\Lambda$CDM does a better job globally, while the holographic models provide a (marginally) better fit to data without very low multipoles (i.e. $l\lesssim 30$), where the dual QFT becomes non-perturbative. Observations can be used to exclude some QFT models, while we also find models satisfying all phenomenological constraints: the data rules out the dual theory being Yang-Mills theory coupled to fermions only, but allows for Yang-Mills theory coupled to non-minimal scalars with quartic interactions. Lattice simulations of 3d QFT's can provide non-perturbative predictions for large-angle statistics of the cosmic microwave background, and potentially explain its apparent anomalies.

8 pages, 3 figures; v2: version to appear in PRL

References in corpus (16)

• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• Bayes in the sky: Bayesian inference and model selection in cosmology
• A Joint Analysis of BICEP2/Keck Array and Planck Data
• Cosmological Collider Physics
• Precision holography for non-conformal branes
• Hidden supersymmetry of domain walls and cosmologies
• Constraints from Conformal Symmetry on the Three Point Scalar Correlator in Inflation
• Holographic Non-Gaussianity
• Cosmological 3-point correlators from holography
• Consistency condition for inflation from (broken) conformal symmetry
• Multi-field inflation from holography
• Soft limits in holographic cosmology
• Three and Four Point Functions of Stress Energy Tensors in D=3 for the Analysis of Cosmological Non-Gaussianities
• Holographic inflation and the conservation of $\zeta$
• Improvement of energy-momentum tensor and non-Gaussianities in holographic cosmology
• Cosmology at the boundary of de Sitter using the dS/QFT correspondence

Cited by in corpus (2)

• Spin networks and the big bang singularity avoidance in the AdS/CFT correspondence
• The monopole problem in holographic cosmology