Mathematics – Logic
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..apr.j3003f&link_type=abstract
American Physical Society, April Meeting, 2004, May 1-4, 2004, Denver, Colorado April 2004, MEETING ID: APR04, abstract #J3.003
Mathematics
Logic
Scientific paper
The measured distances of Type Ia (hydrogen-deficient) supernovae (SNe) as a function of redshift (z) have shown that the expansion of the Universe is currently accelerating, probably due to the presence of repulsive "dark energy" (X) such as Einstein's cosmological constant (Lambda). Combining the high-z data with existing results from large-scale structure surveys, a best fit for OmegaM and OmegaX of 0.28 and 0.72 (respectively) is found, in excellent agreement with the values (0.27 and 0.73) derived from the first year of WMAP measurements of the cosmic microwave background radiation. Most recently, analyses of SNe at z = 1.0-1.7 provide evidence for an early era of deceleration. Several groups are now in the process of measuring hundreds of SNe at z = 0.2-0.8, to determine the equation of state of the dark energy, wX = P/(ρ c^2). Thus far, the best-fit value is wX = -1, suggesting that the dark energy is indeed the cosmological constant. I will also discuss future prospects for using SNe Ia to further improve our knowledge of the cosmological parameters, with an assessment of possible systematic effects (dust, SN evolution, lensing, etc.). If time permits, I will evaluate the potential of Type II (hydrogen-rich) SNe for cosmological studies.
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