Do type Ia supernovae prove a positive cosmological constant?

Hetesi, Zs. and Balázs, L. G. (2005) Do type Ia supernovae prove a positive cosmological constant? In: British-Romanian-Hungarian N+N+N Workshop for Young Researchers On Plasma- and Astrophysics: from laboratory to outer space Edited by I. Ballai, E. Forgács-Dajka, A. Marcu and K. Petrovay. Publications of the Astronomy Department of the Eötvös University (15). ELTE Sokszorosítóüzeme, Budapest, pp. 159-168.

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Abstract

Nowadays the only direct evidence for a model Universe with non-zero cosmological constant is the Hubble diagram of the distant Ia type supernovae. Other observations, e.g. the WMAP measurements, do not support the existence of a non-zero cosmological constant without any doubt. Therefore there is a growing interest in studying the redshift distance diagram of SN Ia supernovae to verify the existence of Lambda\neq0 cosmological constant. In this paper we show that (i) there is a correlation between the statistical residuals of SN Ia distance moduli in the Hubble-diagram and the calculated internal extinction values of the host galaxy. It suggests that there is something wrong with the previous estimations of internal extinction. Furthermore, we show that (ii) the correction for these correlation results a Hubble-diagram which does not support models with Omega_{Lambda}~0.7, rather an Einstein-de Sitter Universe.

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