EXPLORING EARLY AND LATE COSMOLOGY WITH NEXT GENERATION SURVEYS
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Date
2020
Authors
Brando, Guilherme
Linder, Eric V.
Journal Title
Journal ISSN
Volume Title
Publisher
PHYSICAL REVIEW D
Abstract
Perturbations from inflation evolve into large scale structure of the late universe, and encode abundant
cosmic structure formation physics. We allow freedom in the primordial power spectrum, rather than
assuming a power law scale dependence, to study its impact on cosmological parameter determination.
Combining various generations of cosmic microwave background (CMB) data and galaxy redshift survey
data, we investigate the constraints on reconstruction of the primordial curvature perturbation power
spectrum and the late time cosmology, especially the sum of neutrino masses. We quantify how each
successive generation, in CMB and galaxy surveys, provides significant improvements, often by factors of
several. By using CMB polarization information over a broad range of angular scales, and galaxy redshift
data in many bins of redshift, one can allow inflationary freedom and still constrain parameters comparably
to assuming power law dependence. The primordial power spectrum can be reconstructed at the subpercent
level in a dozen wave number bins, while simultaneously fitting the sum of neutrino masses to 14 meV
Description
Keywords
Type of access: Open Access, cosmology, universe, physics
Citation
Brando, G., & Linder, E. V. (2020). Exploring early and late cosmology with next generation surveys. Physical Review D, 101(10). https://doi.org/10.1103/physrevd.101.103510