Welcome to the Kase Lab. webpage
We are engaged in theoretical research in cosmology and astrophysics. In particular, we aim to elucidate unsolved problems in cosmology and gravity theory using the latest observational data.
- Elucidation of the origin of dark energy
Dark energy is an unknown component that is thought to make up the majority of the composition ratio of the current universe, and its existence was postulated as the source of the current accelerated expansion of the universe discovered through observations of supernovae in 1998. Based on the latest observations, dark energy accounts for approximately 70% of the total energy of the current universe, but its origin is still unknown.
- Research on black holes and neutron stars based on general relativity and its extended theory of gravity
Black holes and neutron stars are very heavy and compact objects formed after the gravitational collapse of a star, forming a strong gravitational field in their vicinity. Since their first detection in 2015, gravitational waves (phenomenon of gravity propagating through space-time like ripples) generated by the merger of binary stars formed by such compact objects have been observed one after another. In 2019, the Event Horizon Telescope Collaboration reported the successful imaging of a black hole shadow. These new observations enable us to explore the laws of physics in strong gravitational fields, and there is growing momentum for the verification of general relativity and its extension to the theory of gravity in such regions.