![]() Since matter far exceeds antimatter today, asymmetry is required to explain the imbalance. Had the universe begun with equal amounts of matter and antimatter, they would have annihilated each other into photon radiation, leaving nothing. “A subtle imbalance or asymmetry between matter and antimatter in the early universe is required to achieve today’s matter dominance but cannot be realized within the known framework of fundamental physics.” Leptogenesis to the rescueĬui and Xianyu propose testing leptogenesis, a well-known mechanism that explains the origin of the baryon - visible gas and stars - asymmetry in our universe. ![]() “The fact that our current-day universe is dominated by matter remains among the most perplexing, longstanding mysteries in modern physics,” Cui said. Cui noted that analyzing the imprint of the cosmological collider in today’s cosmos’ contents, such as galaxies and the cosmic microwave background, may reveal new subatomic particle physics.Ĭui and Zhong-Zhi Xianyu, an assistant professor of physics at Tsinghua University, report in the journal Physical Review Letters that by applying the physics of the cosmological collider and using precision data for measuring the structure of our universe from upcoming experiments such as SPHEREx and 21 cm line tomography, the mystery of the cosmic origin of matter may be unraveled. These microscopic structures then seeded the large-scale structure of our universe, which is seen today as the distribution of galaxies throughout the sky. “The inflationary universe behaved just like a cosmological collider, except that the energy was up to 10 billion times larger than any human-made collider.”Īccording to Cui, when the universe expanded, tiny structures formed by energetic events during inflation were stretched, resulting in areas of varying density in an otherwise homogeneous universe. “Cosmic inflation provided a highly energetic environment, enabling the production of heavy new particles as well as their interactions,” Cui said. Yanou Cui, an associate professor of physics and astronomy at UCR, explained that cosmic inflation, a period when the universe expanded at an exponentially increasing pace, is commonly thought to have preceded the Big Bang. ![]()
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