Search Publications

No Evidence for Extensions to the Standard Cosmological Model

Sellentin, Elena; Heavens, Alan; Hosenie, Zafiirah +4 more

We compute the Bayesian evidence for models considered in the main analysis of Planck cosmic microwave background data. By utilizing carefully defined nearest-neighbor distances in parameter space, we reuse the Monte Carlo Markov chains already produced for parameter inference to compute Bayes factors B for many different model-data set combinatio…

From Planck Data to Planck Era: Observational Tests of Holographic Cosmology

Afshordi, Niayesh; Corianò, Claudio; Delle Rose, Luigi +2 more

We test a class of holographic models for the very early Universe against cosmological observations and find that they are competitive to the standard cold dark matter model with a cosmological constant (Λ CDM ) of cosmology. These models are based on three-dimensional perturbative superrenormalizable quantum field theory (QFT), and, while they pr…

Measurement of a Cosmographic Distance Ratio with Galaxy and Cosmic Microwave Background Lensing

Madhavacheril, Mathew S.; Miyatake, Hironao; Spergel, David N. +4 more

We measure the gravitational lensing shear signal around dark matter halos hosting constant mass galaxies using light sources at z ∼1 (background galaxies) and at the surface of last scattering at z ∼1100 (the cosmic microwave background). The galaxy shear measurement uses data from the CFHTLenS survey, and the microwave background shear measureme…