Lensing and Supernovae: Quantifying the Bias on the Dark Energy Equation of State

摘要: The gravitational magnification and demagnification of Type Ia supernovae (SNe) modify their positions on the Hubble diagram, shifting distance estimates from underlying luminosity-distance relation. This can introduce a systematic uncertainty in dark energy equation state (EOS) estimated SNe, although this is expected to average away for sufficiently large data sets. Using mock SN samples over redshift range 0 < z ≤ 1.7, we quantify lensing bias. We find that bias EOS less than half percent sets (2000 SNe). However, if highly magnified events (SNe deviating by more 2.5 σ) are systematically removed analysis, increases ~0.8%. Given parameters measured such sample have 1 σ 10%, related out ~ 1.7 be safely ignored future cosmological measurements.