Future Cosmology: New Physics and Opportunity from the China Space Station Telescope (CSST)

TL;DR

The CSST will perform comprehensive cosmological surveys over ten years, enabling precise measurements of the universe's structure and expansion, thus offering new opportunities to understand dark energy, dark matter, and gravity.

Contribution

This paper reviews the capabilities of the CSST for cosmological studies and highlights its potential to discover new physics through high-precision measurements.

Findings

CSST will measure matter distribution across scales with high accuracy

It will provide percent-level constraints on dark energy and dark matter

The telescope will test theories of gravity precisely

Abstract

The China Space Station Telescope (CSST) is the next-generation Stage~IV survey telescope. It can simultaneously perform multi-band imaging and slitless spectroscopic wide- and deep-field surveys in ten years and an ultra-deep field (UDF) survey in two years, which are suitable for cosmological studies. Here we review several CSST cosmological probes, such as weak gravitational lensing, two-dimensional (2D) and three-dimensional (3D) galaxy clustering, galaxy cluster abundance, cosmic void, Type Ia supernovae (SNe Ia), and baryonic acoustic oscillations (BAO), and explore their capabilities and prospects in discovering new physics and opportunities in cosmology. We find that CSST will measure the matter distribution from small to large scales and the expansion history of the Universe with extremely high accuracy, which can provide percent-level stringent constraints on the properties of dark energy and dark matter and precisely test the theories of gravity.