Core Viewpoint - The successful completion of the AliCPT-1 experiment marks a significant advancement in China's efforts to detect primordial gravitational waves, which are crucial for understanding the origins of the universe [8][15]. Group 1: Overview of the AliCPT Experiment - The AliCPT experiment, led by the Chinese Academy of Sciences, aims to detect primordial gravitational waves, which are considered key to testing theories of the universe's origin [8][10]. - The first phase of the AliCPT experiment has been completed, achieving its first light observation and capturing clear images of radiation from the Moon and Jupiter at a frequency of 150 GHz [15][16]. - The observatory is located at an altitude of 5,250 meters in Tibet, making it the first high-altitude gravitational wave detection facility in the Northern Hemisphere [12][15]. Group 2: Technical Achievements - The AliCPT-1 telescope is noted for having the largest effective aperture and light-gathering capacity among similar telescopes, with multiple leading international performance metrics [16]. - Key technological breakthroughs have been achieved in areas such as low-temperature superconducting detectors and CMB data analysis, significantly advancing China's capabilities in gravitational wave research [16][17]. Group 3: Future Plans and International Collaboration - The second phase of the AliCPT experiment is planned, which will involve upgrading the existing telescope and adding more detectors [17]. - The project is positioned as an international collaboration, involving 16 research institutions, including Stanford University, to enhance China's research capabilities and global influence in this field [17][18].

Group 1 - The core theory of modern cosmology suggests that the universe underwent a rapid inflation phase shortly after its birth, leading to the formation of cosmic structures and the generation of primordial gravitational waves [1][2] - Primordial gravitational waves carry essential secrets about the universe's birth, with various cosmological models predicting different mechanisms and strengths for their generation [2][3] - Detecting primordial gravitational waves is crucial for understanding the quantum effects of gravity and the nature of spacetime, as they provide direct evidence of quantum fluctuations amplified by inflation [2][3] Group 2 - The search for primordial gravitational waves requires specific environmental conditions, with ideal observation sites having low median water vapor content, such as Antarctica, the Atacama Desert in Chile, Greenland, and the Ali region in Tibet, China [3] - The Ali Primordial Gravitational Wave Detection Experiment (AliCPT) successfully achieved its first light observation in April 2025 at an altitude of 5,250 meters, making it one of the most effective telescopes for this purpose [3] - AliCPT-1 has transitioned to the scientific observation phase, aiming to identify unique signatures of primordial B-mode polarization in the cosmic microwave background (CMB) over the coming years [3]

Group 1 - The mainstream theory of modern cosmology posits that the universe underwent a rapid inflationary phase shortly after its birth, leading to the formation of cosmic structures and the generation of primordial gravitational waves [1] - Primordial gravitational waves carry the core secrets of the universe's birth, with various theoretical models predicting different mechanisms and strengths for their generation [2] - Detecting primordial gravitational waves would provide direct evidence of quantum fluctuations in spacetime and could confirm the existence of gravitons, which is crucial for understanding the nature of spacetime [2] Group 2 - The detection of primordial gravitational waves requires specific environmental conditions, with ideal observation sites having median precipitation levels below 2 millimeters [3] - The AliCPT experiment in Tibet, which began scientific observations in April 2025, is currently the largest in terms of effective aperture and number of detectors among similar international telescopes [3] - The exploration of primordial gravitational waves aims to reveal the universe's earliest characteristics, allowing for the "listening" of echoes from 13.8 billion years ago [3]