A tale of two distances

Kunz, Martin and Bassett, Bruce A (2004) A tale of two distances. ArXiv Astrophysics, 2004 (06). 0406013.

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There are two basic ways to measure physical distances in cosmology: One based on standard candles and one based on standard rulers. Comparing current data for each method allows us to rule out axion-photon mixing and dust-extinction as the sources of supernova dimming and generally protects the case for cosmic acceleration from attacks based on loss of photons. The combined data constrains the energy densities in a LCDM model to 0.19 < Omega_m < 0.32 and 0.47 < Omega_Lambda < 0.82 (at 2\sigma) without recourse to any further data sets. Future data will improve on these limits and allow us to place constraints on more exotic physics.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Martin Kunz
Date Deposited: 06 Feb 2012 18:41
Last Modified: 17 Sep 2012 09:22
URI: http://sro.sussex.ac.uk/id/eprint/17804
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