Статья

Probing primordial gravitational waves: Ali CMB Polarization Telescope

Hong LiKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, ChinaSi-Yu LiKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, ChinaYang LiuTheoretical Physics Division, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, ChinaYong-Ping LiTheoretical Physics Division, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, ChinaYifu CaiCAS Key Laboratory for Researches in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei 230026, ChinaMingzhe LiInterdisciplinary Center for Theoretical Study, University of Science and Technology of China, Hefei 230026, ChinaGong-Bo ZhaoInstitute of Cosmology & Gravitation, University of Portsmouth, Portsmouth PO1 3FX, UKCong-Zhan LiuKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, ChinaZheng-Wei LiKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, ChinaHe XuKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, ChinaDi WuKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, ChinaYong-Jie ZhangKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, ChinaZu-Hui FanDepartment of Astronomy, School of Physics, Peking University, Beijing 100871, ChinaYong-Qiang YaoNational Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, ChinaChao-Lin KuoPhysics Department, Stanford University, Stanford, CA 94305, USAFang-Jun LuKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, ChinaXinmin ZhangTheoretical Physics Division, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

2018en

ABI

Аннотация

Abstract In this paper, we will give a general introduction to the Ali CMB Polarization Telescope (AliCPT) project, which is a Sino–US joint project led by the Institute of High Energy Physics and involves many different institutes in China. It is the first ground-based Cosmic Microwave Background (CMB) polarization experiment in China and an integral part of China's Gravitational-wave Program. The main scientific goal of the AliCPT project is to probe the primordial gravitational waves (PGWs) originating from the very early Universe. The AliCPT project includes two stages. The first stage, referred to as AliCPT-1, is to build a telescope in the Ali region of Tibet at an altitude of 5250 meters. Once completed, it will be the highest ground-based CMB observatory in the world and will open a new window for probing PGWs in the northern hemisphere. The AliCPT-1 telescope is designed to have about 7000 transition-edge sensor detectors at 95 GHz and 150 GHz. The second stage is to have a more sensitive telescope (AliCPT-2) with more than 20 000 detectors. Our simulations show that AliCPT will improve the current constraint on the tensor-to-scalar ratio r by one order of magnitude with three years' observation. Besides the PGWs, AliCPT will also enable a precise measurement of the CMB rotation angle and provide a precise test of the CPT symmetry. We show that three years' observation will improve the current limit by two orders of magnitude.

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Идентификаторы

DOI: 10.1093/nsr/nwy019

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