| Title | Constraining Brans-Dicke Cosmology with the CSST Galaxy Clustering Spectroscopic Survey |
| Authors | Chen, Anda Gong, Yan Wu, Fengquan Wang, Yougang Chen, Xuelei |
| Affiliation | Chinese Acad Sci, Natl Astron Observ, Key Lab Space Astron & Technol, Beijing 100101, Peoples R China Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China Chinese Acad Sci, Sci Ctr China Space Stn Telescope, Natl Astron Observ, 20A Datun Rd, Beijing 100101, Peoples R China Chinese Acad Sci, Natl Astron Observ, Key Lab Computat Astrophys, Beijing 100101, Peoples R China Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China |
| Keywords | DIGITAL SKY SURVEY DARK ENERGY GENERAL-RELATIVITY MACHS PRINCIPLE SPACE ZCOSMOS REAL |
| Issue Date | 1-May-2022 |
| Publisher | RESEARCH IN ASTRONOMY AND ASTROPHYSICS |
| Abstract | The Brans-Dicke (BD) theory is the simplest Scalar-Tensor theory of gravity, which can be considered as a candidate of modified Einstein's theory of general relativity. In this work, we forecast the constraints on BD theory in the CSST galaxy clustering spectroscopic survey with a magnitude limit similar to 23 AB mag for point-source 5 sigma detection. We generate mock data based on the zCOSMOS catalog and consider the observational and instrumental effects of the CSST spectroscopic survey. We predict galaxy power spectra in the BD theory from z = 0 to 1.5, and the galaxy bias and other systematical parameters are also included. The Markov Chain Monte Carlo technique is employed to find the best-fits and probability distributions of the cosmological and systematical parameters. A BD parameter zeta is introduced, which satisfies zeta = ln (1 + 1/omega). We find that the CSST spectroscopic galaxy clustering survey can give vertical bar zeta vertical bar < 10(-2), or equivalently vertical bar omega vertical bar > O(10(2)) and vertical bar(G)over dot/G vertical bar < 10 (-13), under the assumption zeta = 0. These constraints are almost at the same order of magnitude compared to the joint constraints using the current cosmic microwave background, baryon acoustic oscillations and Type Ia supernova data, indicating that the CSST galaxy clustering spectroscopic survey would be powerful for constraining the BD theory and other modified gravity theories. |
| URI | http://hdl.handle.net/20.500.11897/642985 |
| ISSN | 1674-4527 |
| DOI | 10.1088/1674-4527/ac6418 |
| Indexed | SCI(E) |
| Appears in Collections: | 物理学院 |
