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Title:
Hiding dark energy transitions at low redshift
Authors:
Mortonson, Michael; Hu, Wayne; Huterer, Dragan
Affiliation:
AA(Kavli Institute for Cosmological Physics and Department of Physics, University of Chicago, Chicago, Illinois 60637, USA), AB(Kavli Institute for Cosmological Physics and Department of Astronomy & Astrophysics, University of Chicago, Chicago, Illinois 60637, USA), AC(Department of Physics, University of Michigan, 450 Church St, Ann Arbor, Michigan 48109-1040, USA)
Publication:
Physical Review D, vol. 80, Issue 6, id. 067301 (PhRvD Homepage)
Publication Date:
09/2009
Origin:
APS
Keywords:
Dark energy, Supernovae
PACS Keywords:
Dark energy, Supernovae
DOI:
10.1103/PhysRevD.80.067301
Bibliographic Code:
2009PhRvD..80f7301M

Abstract

We show that it is both observationally allowable and theoretically possible to have large fluctuations in the dark energy equation of state as long as they occur at ultralow redshifts z≲0.02. These fluctuations would masquerade as a local transition in the Hubble rate of a few percent or less and escape even future, high precision, high redshift measurements of the expansion history and structure. Scalar field models that exhibit this behavior have a sharp feature in the potential that the field traverses within a fraction of an e-fold of the present. The equation of state parameter can become arbitrarily large if a sharp dip or bump in the potential causes the kinetic and potential energy of the field to both be large and have opposite sign. While canonical scalar field models can decrease the expansion rate at low redshift, increasing the local expansion rate requires a noncanonical kinetic term for the scalar field.
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