New Breakthrough Towards Understanding Dark Energy

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Exploration of the Universe by SDSS Mission

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Exploration of the Universe by the SDSS objective throughout the previous 20 years (1998-2019). Credit: eBOSS cooperation

The extended Baryon Oscillation Spectroscopic Survey (eBOSS) cooperation has actually launched its most current clinical outcomes. These results consist of 2 research studies on dark energy led by Prof. ZHAO Gongbo and Prof. WANG Yuting, respectively, from National Astronomical Observatories of the Chinese Academy of Sciences(NAOC).

The research study led by Prof. Zhao was just recently released in Monthly Notices of the Royal Astronomical Society.

Based on eBOSS observations, Prof. ZHAO’s group determined the history of cosmic growth and structure development in a substantial volume of the previous universe, representing a distance variety in between 0.7 and 1.8 billion light years far from us. This volume had actually never ever been penetrated prior to.

This research study made the most of an approach called “multi-tracer analysis,” which reduced the observational systematics proposed and executed by Prof. ZHAO and Prof. WANG.

“This work detected the existence of dark energy at a significance of 11 sigma, which is the strongest evidence ever on dark energy from galaxy surveys,” stated Prof. ZHAO. “The eBOSS observations are consistent with the dynamical dark energy probed by our team using the BOSS survey four years ago.”

One of the greatest obstacles of the cosmological ramifications of galaxy studies is information analysis, specifically establishing brand-new techniques to enhance analytical precision and alleviate systematics. eBOSS, as the very first galaxy study that observes several kinds of galaxies in a huge cosmic volume, makes it possible to utilize multi-tracer analysis.

“Cross-correlating multiple types of galaxies is an efficient way to reduce statistical uncertainties, with observational systematics mitigated at the same time, which is key to obtaining robust cosmological results,” stated Prof. WANG.

Dark energy controls the existing universe, so it is critically important to expose its nature. The eBOSS cooperation, which includes over 30 leading research study institutes on astronomy all over the world consisting of NAOC, was formed to deal with the issue of dark energy. Operating because 2014, eBOSS has actually taken control of 1 million spectra in the redshift series of 0.6.

Although eBOSS has actually finished its objective, it is a beginning point for the next chapter. The experience with eBOSS is important for cosmology including bigger galaxy studies, consisting of the Chinese Space Station Telescope (CSST), Dark Energy Spectroscopic Instrument (DESI) and Prime Focus Spectrograph (PFS).

Reference: ” The finished SDSS-IV extended Baryon Oscillation Spectroscopic Survey: a multitracer analysis in Fourier area for determining the cosmic structure development and growth rate” by Gong-Bo Zhao, Yuting Wang, Atsushi Taruya, Weibing Zhang, Héctor Gil-Marín, Arnaud de Mattia, Ashley J Ross, Anand Raichoor, Cheng Zhao, Will J Percival, Shadab Alam, Julian E Bautista, Etienne Burtin, Chia-Hsun Chuang, Kyle S Dawson, Jiamin Hou, Jean-Paul Kneib, Kazuya Koyama, Hélion du Mas des Bourboux, Eva-Maria Mueller, Jeffrey A Newman, John A Peacock, Graziano Rossi, Vanina Ruhlmann-Kleider, Donald P Schneider and Arman Shafieloo, 24 March 2021, Monthly Notices of the Royal Astronomical Society.
DOI: 10.1093/mnras/stab849

This work is supported by the Natural Science Foundation of China, Ministry of Science and Technology of China, and Chinese Academy of Sciences.



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