Probing Primordial Gravitational Waves: Ali CMB Polarization Telescope
Hong Li, Si-Yu Li, Yang Liu, Yong-Ping Li, Yifu Cai, Mingzhe Li,, Gong-Bo Zhao, Cong-Zhan Liu, Zheng-Wei Li, He Xu, Di Wu, Yong-Jie Zhang,, Zu-Hui Fan, Yong-Qiang Yao, Chao-Lin Kuo, Fang-Jun Lu, Xinmin Zhang

TL;DR
The Ali CMB Polarization Telescope project aims to detect primordial gravitational waves and test fundamental physics by building ground-based telescopes in Tibet, with expected significant improvements in measurement sensitivity over three years.
Contribution
This paper introduces the AliCPT project, a new ground-based CMB polarization experiment in China, with innovative telescope design and projected advancements in probing early Universe physics.
Findings
AliCPT will improve constraints on tensor-to-scalar ratio by an order of magnitude.
The project will enable precise measurements of CMB rotation angle and CPT symmetry.
AliCPT-1 will be the highest ground-based CMB observatory in the northern hemisphere.
Abstract
In this paper, we will give a general introduction to the project of Ali CMB Polarization Telescope (AliCPT), which is a Sino-US joint project led by the Institute of High Energy Physics (IHEP) and has involved 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 Waves Program. The main scientific goal of AliCPT project is to probe the primordial gravitational waves (PGWs) originated 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 with an altitude of 5,250 meters. Once completed, it will be the worldwide highest ground-based CMB observatory and open a new window for probing PGWs in northern hemisphere. AliCPT-1 telescope is designed to have about…
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