LIM is an observational technique that targets atomic or molecular spectral lines. I'm interested in its potential to survey both the large-scale matter distribution and the astrophysical conditions of the interstellar and intergalactic medium across vast volumes of the Universe. I have worked on a variety of projects exploring how it can be used to learn about inflation, reionization, and dark matter, as well as developed a formalism to combine summary statistics of LIM data.
Axions and axion-like particles are among the compelling dark-matter candidates. In a recent work, we showed that a high-significance excess in the cosmic optical background measured by NASA’s New Horizons spacecraft can be explained by an axion-like particle in a region of parameter space that was previously unconstrained. Motivated by this result, we then studied a similar parameter space through the attenuation of γ-rays from blazars.
Pulsar timing arrays are expected to soon detect nanohertz gravitational waves (GWs) and I'm interested in exploring new signatures that can be used to learn about the origin of such signal. In a recent publication, we showed that the circular polarization of the GW background may be detectable and informative about the properties of the GW sources.