Congratulations go out to Jiachuan Xu, TAP student member and recipient of the CoS Graduate Student Research Award for his development of a cosmological measurement tool, Kinematic Lensing.
Weak lensing is one of the most powerful tools to directly probe the dark sector of our Universe. However, the shape measurement and systematics control of weak lensing are also extremely complicated. All these intricacies stem from the degeneracy of cosmic shear and the intrinsic shape of galaxies. Kinematic lensing is a novel weak lensing method that smartly utilizes photometric and spectroscopic information to break this degeneracy. The method is predicted to measure the cosmic shear with 10 times lower shape noise. Jiachuan and his collaborators have mapped out the potential of this technique when it is applied to Roman Space Telescope High Latitude Survey imaging+grism data by running realistic Bayesian cosmological forecasts. They found that this new technique could triple Roman’s constraining power of dark energy equation-of-state and it is largely immune to many known systematics of weak lensing. Now they are continuing to work on image simulation and pipeline development to advance this technique and bring it into practical application as soon as possible.
Jiachuan is a graduate student (Advisory: Tim Eifler) in the Arizona Cosmology Lab research group in the Department of Astronomy, Steward Observatory.
More information on this cosmological measurement technique, Kinematic lensing with the Roman Space Telescope.
Congratulations go out to Jiachuan Xu, TAP student member and recipient of the CoS Graduate Student Research Award for his development of a cosmological measurement tool, Kinematic Lensing.
Weak lensing is one of the most powerful tools to directly probe the dark sector of our Universe. However, the shape measurement and systematics control of weak lensing are also extremely complicated. All these intricacies stem from the degeneracy of cosmic shear and the intrinsic shape of galaxies. Kinematic lensing is a novel weak lensing method that smartly utilizes photometric and spectroscopic information to break this degeneracy. The method is predicted to measure the cosmic shear with 10 times lower shape noise. Jiachuan and his collaborators have mapped out the potential of this technique when it is applied to Roman Space Telescope High Latitude Survey imaging+grism data by running realistic Bayesian cosmological forecasts. They found that this new technique could triple Roman’s constraining power of dark energy equation-of-state and it is largely immune to many known systematics of weak lensing. Now they are continuing to work on image simulation and pipeline development to advance this technique and bring it into practical application as soon as possible.
Jiachuan is a graduate student (Advisory: Tim Eifler) in the Arizona Cosmology Lab research group in the Department of Astronomy, Steward Observatory.
More information on this cosmological measurement technique, Kinematic lensing with the Roman Space Telescope.