Cosmology from Supernova Magnification Maps

Cosmology from Supernova Magnification Maps

High-z Type Ia supernovae are expected to be gravitationally lensed by the foreground distribution of largescale structure. The resulting magnification of supernovae is statistically measurable, and the angular correlation of the magnification pattern directly probes the integrated mass density along the line of sight. Measurements of cosmic magnification of supernovae therefore complements gal...

Foundations of supernova cosmology

Dust versus Supernova Cosmology

Here we present some critical discussions about the systematic uncertainty by dust extinction in the recent cosmological results of high-redshift Type Ia supernovae. First we argue that the currently available data do not robustly exclude the cosmologically significant extinction either by the reddening check or the dispersion argument because of the observational uncertainties, even in the cas...

Magnification control in neural maps

Ideal bandpasses for type Ia supernova cosmology

To use type Ia supernovae as standard candles for cosmology we need accurate broadband magnitudes. In practice the observed magnitude may differ from the ideal magnitude-redshift relationship either through intrinsic inhomogeneities in the type Ia supernova population or through observational error. Here we investigate how we can choose filter bandpasses to reduce the error caused by both these...