Description: Ultralight axions with a mass of 10^-33 eV offer one explanation for the recent hints of evolving dark energy. If they comprise 100% of the dark energy today, they must carry isocurvature fluctuations that may have an observable signal in future lensing.

We present a yield simulation of detectable galaxy-galaxy strong gravitational lenses in Roman's High Latitude Wide Area Survey (HLWAS). For a fiducial case of single 146-second exposures, we predict around 160,000 detectable strong lenses in the HLWAS...

Since Lyman Alpha Emitting galaxies (LAEs) have such a prominent emission line feature, they shine as bright cosmological beacons, tracing out the Large Scale Structure of the Universe. We, therefore, use large, uniform samples of LAE to probe galaxy...

Constraints on the sum of neutrino masses using DESI BAO and CMB data favor a negative value. This has been interpreted as a signal of excess lensing. I seek to determine if this excess lensing can be accounted for by dark matter isocurvature (CDI).

We would like to find a simple cluster detection scheme that is easy to implement in simulation-based forward modeling.

The High Latitude Imaging Survey (HLIS) of NASA's Nancy Grace Roman Space Telescope will provide powerful tests of cosmological models through sensitive measurements of cosmic shear, galaxy-galaxy lensing (GGL), and galaxy clustering. As part of the HLIS

This work uses spherical scattering transform, a higher-order statistics method, to weak gravitational lensing data in order to improve cosmological parameter inference. Our pipeline calculates the spherical scattering coefficients, compresses them...

The next generation of cosmology surveys will probe the matter distribution of the universe to unparalleled precision. To match this level of precision in cosmological parameter estimation, we need to use information at small scales of ∼ 1 Mpc,...

We use the Atacama Cosmology Telescope (ACT) thermal Sunyaev-Zeldovich data to separate Dark Energy Spectroscopic Instrument (DESI) Luminous Red Galaxies (LRGs) into distinct subpopulations corresponding to different densities and biases independently...

New diagnostic method that constrains the running of the scalar spectral index αₛ of primordial density fluctuations using the rotation of void, observable as redshift asymmetry across their projected spin axes. With simulation results, we check our univ

I present measurements of the electrical properties of SQUID series array (SSA) amplifiers under multiple configurations. I also report measurements of the thermal conductivity of materials commonly used in cryogenic wiring. These results inform thermal...

Polar ring galaxies (PRGs) are a special kind of galaxies that are rare and less studied. We make use of Convoluted Neural Network (CNN) to detect PRGs from images from sky survey.

We investigate the impact of dynamical dark energy on the Lyman Alpha transmitted flux power spectrum and intergalactic medium properties using high-resolution cosmological, hydrodynamical simulations. We find a spectral- and redshift-dependent feature...

Self-Organizing Map p(z) (SOMPZ), a photo-z calibration framework widely used in current surveys, will be a promising candidate for the Roman HLIS photo-z pipeline. We tested the SOMPZ pipeline on simulated Roman photometry generated by Cardinal Sim, ...