Thesiss

Using the Cosmic Ray Isotope Spectrometer (CRIS) onboard the Advanced Composition Explorer (ACE) spacecraft, new and improved high-precision measurements of the elemental composition and energy spectra of galactic cosmic rays with energies from ∼50–550 MeV/nucleon and nuclear ch…

The Hubble constant (H0) is one of the most important parameters in cosmology. Its value directly sets the age, the size, and the critical density of the Universe. Despite the great success of the LCDM model, a stringent challenge to the model comes from a discrepancy between th…

Stellar streams, the tidal remnants of accreted globular clusters and dwarf galaxies, are uniquely powerful tools for studying the Milky Way. In particular, they allow for strong constraints on the local distribution of dark matter, and they provide insight into how our Galaxy h…