The prolonged Baryon Oscillation Spectroscopic Survey (eBOSS) collaboration has launched its newest scientific outcomes. These outcomes embrace two research on dark energy led by Prof. Zhao Gongbo and Prof. Wang Yuting, respectively, from Nationwide Astronomical Observatories of the Chinese language Academy of Sciences (NAOC).
The examine led by Prof. Zhao was just lately printed in Month-to-month Notices of the Royal Astronomical Society.
Based mostly on eBOSS observations, Prof. Zhao’s crew measured the historical past of cosmic enlargement and construction progress in an enormous quantity of the previous universe, similar to a distance vary between 0.7 and 1.8 billion mild years away from us. This quantity had by no means been probed earlier than.
This examine took benefit of a way known as “multi-tracer evaluation,” which mitigated the observational systematics proposed and applied by Prof. Zhao and Prof. Wang.
“This work detected the existence of dark energy at a significance of 11 sigma, which is the strongest proof ever on dark energy from galaxy surveys,” mentioned Prof. Zhao. “The eBOSS observations are according to the dynamical dark energy probed by our crew utilizing the BOSS survey 4 years in the past.”
One of many largest challenges of the cosmological implications of galaxy surveys is information evaluation, particularly creating new strategies to enhance statistical accuracy and mitigate systematics. eBOSS, as the primary galaxy survey that observes a number of kinds of galaxies in an unlimited cosmic quantity, makes it attainable to make use of multi-tracer evaluation.
“Cross-correlating a number of kinds of galaxies is an environment friendly technique to scale back statistical uncertainties, with observational systematics mitigated on the identical time, which is essential to acquiring sturdy cosmological outcomes,” mentioned Prof. Wang.
Dark energy dominates the present universe, so it’s vitally vital to disclose its nature. The eBOSS collaboration, which consists of over 30 prime analysis institutes on astronomy world wide together with NAOC, was shaped to sort out the issue of dark energy. Working since 2014, eBOSS has taken over 1 million spectra within the redshift vary of 0.6.
Though eBOSS has accomplished its mission, it’s a place to begin for the subsequent chapter. The expertise with eBOSS is efficacious for cosmology involving bigger galaxy surveys, together with the Chinese language House Station Telescope (CSST), Dark Energy Spectroscopic Instrument (DESI) and Prime Focus Spectrograph (PFS).
Supply: DOI: 10.1093/mnras/stab849
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