The Dark Imprints Of Superstructures On The CMB

Details The Dark Imprints Of Superstructures On The CMB The Dark Imprints Of Superstructures On The CMB

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21330902g&link_type=abstract

American Astronomical Society, AAS Meeting #213, #309.02; Bulletin of the American Astronomical Society, Vol. 41, p.284

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We observe the onset of cosmic acceleration due to dark energy through the Integrated Sachs-Wolfe (ISW) effect. The accelerated expansion causes large-scale gravitational potentials to decay, leaving an imprint of structure on background radiation. We use a photometric catalog from SDSS to construct a map of the ISW signature on the CMB. We find that the strongest signal arises from 100Mpc over- and under-dense superstructures. These supervoids cool the CMB, and conversely, superclusters leave a hot spot, although the contribution from nonlinear effects must be disentangled. The constructed ISW map allows a direct detection of dark energy, superior to cross-correlation approaches for all-sky surveys such as Pan-STARRS.

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