Supernovae are important for many cosmological tests, especially wether cosmic time dilation exists or not. But we have always been limited by low redshift supernovae (datasets often cap at Z=1.1). There was only a handful (like 2-3) ~Z=2 supernovae discovered by Hubble, and a few Z=2.5 discovered by the subaru primecam discovered prior and zero via JWST. I recently stumbled upon the discovery of the highest ever, spectroscopically confirmed sn1a supernova at Z=2.9 https://arxiv.org/abs/2406.05089 However my mind was completely blown away today when I read this new NASA blog post that says over 80 Z>=2 supernovae candidates have been found in the JADES field. Which is ten time more than all previously known high Z supernovae, in a single sky survey. NOT ONLY THAT, but the blog casually drop that:
The team identified a number of high-redshift supernovae, including the farthest one ever spectroscopically confirmed, at a redshift of 3.6.
A supernovae at Z=3.6 is absolutely mind blowing and would revolutionize cosmic time dilation tests. The signal to noise ratio should be improved by ~360% (simplist assumption because reddening and stretch parameter evolve with redshift). However I just can’t find the papers yet (except for the 2.9), it seems it’s still in the works? The hype is real. https://science.nasa.gov/missions/webb/nasas-webb-opens-new-window-on-supernova-science/ edit not an expert on supernovae but it seems it is a type II supernovae (core collapse) which are less testable but the 2.9 one is a SNIa and therefore still a ~290% increase in signal to noise ratio, especially since no one tested the hubble and subaru ones previously either.
@LifeIsStrange thanks for the links to articles about high-z supernovae.
I wonder, how do you think these will confirm whether cosmic time dilation exists or not? If the analysis is done using $\Lambda\mbox{CDM}$, they will get the same results with high-z SNe since time dilation is part of the analysis.