3 papers
astro-ph.CO2020
Modeling Galaxies in Redshift Space at the Field Level
Marcel Schmittfull, Marko Simonović, Mikhail M. Ivanov +2
We develop an analytical forward model based on perturbation theory to predict the redshift-space galaxy overdensity at the field level given a realization of the initial condition…
astro-ph.CO2020
Fewer Mocks and Less Noise: Reducing the Dimensionality of Cosmological Observables with Subspace Projections
Oliver H. E. Philcox, Mikhail M. Ivanov, Matias Zaldarriaga +2
Creating accurate and low-noise covariance matrices represents a formidable challenge in modern-day cosmology. We present a formalism to compress arbitrary observables into a small…
astro-ph.CO2017
Efficient Evaluation of Cosmological Angular Statistics
Valentin Assassi, Marko Simonović, Matias Zaldarriaga
Angular statistics of cosmological observables are hard to compute. The main difficulty is due to the presence of highly-oscillatory Bessel functions which need to be integrated ov…