TY - JOUR
T1 - Testing for double inflation with WMAP
AU - Parkinson, David
AU - Tsujikawa, Shinji
AU - Bassett, Bruce A.
AU - Amendola, Luca
PY - 2005/3/15
Y1 - 2005/3/15
N2 - With the WMAP data we can now begin to test realistic models of inflation involving multiple scalar fields. These naturally lead to correlated adiabatic and isocurvature (entropy) perturbations with a running spectral index. We present the first full (9 parameter) likelihood analysis of double inflation with WMAP data and find that despite the extra freedom, supersymmetric hybrid potentials are strongly constrained with less than 7% correlated isocurvature component allowed when standard priors are imposed on the cosomological parameters. As a result we also find that Akaike and Bayesian model selection criteria rather strongly prefer single-field inflation, just as equivalent analysis prefers a cosmological constant over dynamical dark energy in the late universe. It appears that simplicity is the best guide to our universe.
AB - With the WMAP data we can now begin to test realistic models of inflation involving multiple scalar fields. These naturally lead to correlated adiabatic and isocurvature (entropy) perturbations with a running spectral index. We present the first full (9 parameter) likelihood analysis of double inflation with WMAP data and find that despite the extra freedom, supersymmetric hybrid potentials are strongly constrained with less than 7% correlated isocurvature component allowed when standard priors are imposed on the cosomological parameters. As a result we also find that Akaike and Bayesian model selection criteria rather strongly prefer single-field inflation, just as equivalent analysis prefers a cosmological constant over dynamical dark energy in the late universe. It appears that simplicity is the best guide to our universe.
UR - http://www.scopus.com/inward/record.url?scp=18444364200&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=18444364200&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.71.063524
DO - 10.1103/PhysRevD.71.063524
M3 - Article
AN - SCOPUS:18444364200
VL - 71
SP - 1
EP - 7
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
SN - 1550-7998
IS - 6
M1 - 063524
ER -