Model independent early expansion history and dark energy

TY - JOUR

T1 - Model independent early expansion history and dark energy

AU - Samsing, Johan Georg Mulvad

AU - Linder, Eric V.

AU - Smith, Tristan L.

PY - 2012/12/3

Y1 - 2012/12/3

N2 - We examine model independent constraints on the high redshift and prerecombination expansion history from upcoming cosmic microwave background observations, using a combination of principal component analysis and other techniques. This can be translated to model independent limits on early dark energy and the number of relativistic species Neff. Models such as scaling (Doran-Robbers), dark radiation (ΔNeff), and barotropic aether fall into distinct regions of eigenspace and can be easily distinguished from each other. Incoming CMB data will map the expansion history from z=0-105, achieving subpercent precision around recombination, and enable determination of the amount of early dark energy and valuable guidance to its nature.

AB - We examine model independent constraints on the high redshift and prerecombination expansion history from upcoming cosmic microwave background observations, using a combination of principal component analysis and other techniques. This can be translated to model independent limits on early dark energy and the number of relativistic species Neff. Models such as scaling (Doran-Robbers), dark radiation (ΔNeff), and barotropic aether fall into distinct regions of eigenspace and can be easily distinguished from each other. Incoming CMB data will map the expansion history from z=0-105, achieving subpercent precision around recombination, and enable determination of the amount of early dark energy and valuable guidance to its nature.

U2 - 10.1103/PhysRevD.86.123504

DO - 10.1103/PhysRevD.86.123504

M3 - Journal article

SN - 1550-7998

VL - 86

SP - 123504

JO - Physical Review D (Particles, Fields, Gravitation and Cosmology)

JF - Physical Review D (Particles, Fields, Gravitation and Cosmology)

IS - 12

ER -