arXiv (Cornell University)· 2013· Preprint
The DESI Experiment, a whitepaper for Snowmass 2013
- 397citations
- 2013year
Short summary
The Dark Energy Spectroscopic Instrument (DESI) will map 25 million galaxies and quasars to make 1%-level measurements of the distance scale in 35 redshift bins, providing unprecedented constraints on dark energy and cosmology.
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Key points
- DESI will obtain spectra for at least 25 million galaxies and quasars (18M emission-line galaxies, 4M luminous red galaxies, 3M quasars).
- The instrument will create 3-D galaxy maps at z<2 and Lyman-alpha forest maps at z>2.
- DESI aims for 1%-level measurements of the distance scale in 35 redshift bins.
- Key science goals include probing dark energy, measuring gravitational growth, constraining neutrino mass, and investigating primordial inflation signatures.
AI-generated from the title and abstract; the full text is not read.
Abstract
The Dark Energy Spectroscopic Instrument (DESI) is a massively multiplexed fiber-fed spectrograph that will make the next major advance in dark energy in the timeframe 2018-2022. On the Mayall telescope, DESI will obtain spectra and redshifts for at least 18 million emission-line galaxies, 4 million luminous red galaxies and 3 million quasi-stellar objects, in order to: probe the effects of dark energy on the expansion history using baryon acoustic oscillations (BAO), measure the gravitational growth history through redshift-space distortions, measure the sum of neutrino masses, and investigate the signatures of primordial inflation. The resulting 3-D galaxy maps at z<2 and Lyman-alpha forest at z>2 will make 1%-level measurements of the distance scale in 35 redshift bins, thus providing unprecedented constraints on cosmological models.
The authors' abstract, as published at the source. arXiv (Cornell University), 2013 · DOI ↗
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Field: Instrumentation
InstrumentationPhysics and Astronomy