科学研究
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2023.05.11
Physical Mechanisms Regulating Gas Supply to Galaxies
I will first present an overview of the problem of galaxy formation. I will then turn my attention to some important and robust physical mechanisms that regulate the supply of cold gas to galaxies. I will in the end try to convey the message that the field of galaxy formation simulation would benefit by turning to more physics, rather than parameter, based approach, through exploring additional...
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2023.05.10
A dynamical model and structure decomposition of barred galaxies
Galaxy structures are fossil records of their assembly history. Modern IFU spectrographs offer the ability to map the spatial distribution of the motions, ages, and chemical abundances of stars in galaxies, which provide unprecedented detailed view of galaxies structures. But the information are still blended along the line-of-sight. Decomposition of galactic structures in a physical way is cha...
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2023.05.10
cosmological tests on fundamental physics
The precision measurements from current observational cosmology have established the Lambda-Cold-Dark-Matter (LCDM) model as the standard cosmological model. However, the LCDM model as a pure phenomenological model with six base parameters still calls for a theoretical understanding of underlying mechanisms for the early and late accelerations as well as the nature of dark matter. In this talk,...
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2023.04.28
Alternative theories of gravity and their tests using astronomy observations
General relativity is currently the standard theory to describe gravity. It has passed all the tests in our Solar System and has been positively supported by astronomy observations including electromagnetic waves from neutron stars and gravitational waves from coalescing compact binary systems. But fundamentally it is incompatible with quantum theory, and there are also the large-scale observat...
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2023.04.27
Formation of hot Jupiters in star clusters
It has been suggested that the occurrence rate of hot Jupiters (HJs) in some open clusters might reach several per cent, significantly higher than that of the field. Several models have been proposed to solve this problem but none has been satisfactory. In a binary-rich cluster, the von Zeipel-Lidov-Kozai (ZKL) mechanism may cause the observed high occurrence rate. For planets formed around a s...
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