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Gravitational waves produced from topological defects
03/07
2023
Seminar
- Title Gravitational waves produced from topological defects
- Speaker Ye-Ling Zhou (HIAS/UCAS)
- Date 10:00 Mar. 7, 2023
- Venue
Abstract
Topological defects are a class of important concepts in particle cosmology. They are physical objects formed when a fundamental symmetry is spontaneously broken during the cooling of the expanding Universe. Typical topological defects include monopoles, domain walls and cosmic strings. While the first two lead to a serous cosmological problem and should be diluted by inflation, the last one is safe and have some interesting features favoured by theorists. The most important one is that it is a main source to generate cosmic background of stochastic gravitational waves (GWs). An observation of this background in the future will be helpful for us to construct a fundamental particle theory at super-high energy scale. On the other hand, biased domain walls could avoid the cosmological problem and provide another source for GWs. In this paper, I will introduce mechanisms of GWs from topological defects and discuss their connections to fundamental particle theories.