Dark Energy Phenomena as Gigaparsec Voids: Constraints due to Spectral Distortion

Details Dark Energy Phenomena as Gigaparsec Voids: Constraints due to Spectral Distortion Dark Energy Phenomena as Gigaparsec Voids: Constraints due to Spectral Distortion

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1318...71c&link_type=abstract

RECENT DEVELOPMENTS IN GRAVITATION AND BEC'S PHENOMENOLOGY: IV Mexican Meeting on Experimental and Theoretical Physics: Symposiu

Physics

Redshift, Dark Matter, Cosmic Background Radiation, Cosmology, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies, Dark Energy, Background Radiations, Observational Cosmology

Scientific paper

Cosmological spacetimes constructed from the Lemaitre-Tolman-Bondi metric are implemented to explain the distance-redshift relationship inferred from type 1a supernovae and other tracers of cosmic evolution, in place of dark energy. The observer is required to be located at or very near the center of this spherically-symmetric but radially-inhomogeneous spacetime, in order to match the degree of isotropy exhibited by the cosmic microwave background (CMB). As viewed from near the center, radial lines-of-sight traversed by light rays cannot be used to distinguish between cosmological constant-like dark energy and a Copernican Principle-violating void at the center of the Universe. Scattered light, however, affords a view that can help determine whether we occupy a privileged location. Specifically, CMB photons that scatter off reionized gas in a radially-inhomogeneous Universe contribute to a distortion of the blackbody spectrum that is distnct from the predictions in the case of radial homogeneity. This observational test of the Copernican Principle is shown to rule out a family of dark energy-inspired Lemaitre-Tolman-Bondi spacetimes.

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