745 citations · 4k across the 28 of their papers we have counts for
9 papers · 1 filter
Analytic bispectrum covariance for galaxy survey cosmology
Utkarsh Giri, Henry S. Grasshorn Gebhardt, Olivier Dore
The bispectrum of galaxy distribution remains an underutilized statistic in cosmological data analysis. This can be attributed to mathematical and computational challenges associat…
If at First You Don't Succeed, Trispectrum: I. Estimating the Matter Power Spectrum Covariance with Higher-Order Statistics
Samuel Goldstein, Kendrick M. Smith, Utkarsh Giri +1
We present a method to estimate non-Gaussian power spectrum covariance matrices by directly measuring the response of the small-scale power spectrum to long-wavelength perturbation…
Cosmological constraints from harmonic space analysis of DES Y3 3x2 clustering
Utkarsh Giri, Sai Chaitanya Tadepalli
The large-scale distribution of matter, as mapped by photometric surveys like the Dark Energy Survey (DES), serves as a powerful probe into cosmology. It is especially sensitive to…
Constraining using the Large-Scale Modulation of Small-Scale Statistics
Utkarsh Giri, Moritz Münchmeyer, Kendrick M. Smith
We implement a novel formalism to constrain primordial non-Gaussianity of the local type from the large-scale modulation of the small-scale power spectrum. Our approach combines in…
Robust Neural Network-Enhanced Estimation of Local Primordial Non-Gaussianity
Utkarsh Giri, Moritz Münchmeyer, Kendrick M. Smith
When applied to the non-linear matter distribution of the universe, neural networks have been shown to be very statistically sensitive probes of cosmological parameters, such as th…
CHIME/FRB Catalog 1 results: statistical cross-correlations with large-scale structure
Masoud Rafiei-Ravandi, Kendrick M. Smith, Dongzi Li +38
The CHIME/FRB Project has recently released its first catalog of fast radio bursts (FRBs), containing 492 unique sources. We present results from angular cross-correlations of CHIM…
Normalizing flows for random fields in cosmology
Adam Rouhiainen, Utkarsh Giri, Moritz Münchmeyer
Normalizing flows are a powerful tool to create flexible probability distributions with a wide range of potential applications in cosmology. Here we are studying normalizing flows…
Exploring KSZ velocity reconstruction with -body simulations and the halo model
Utkarsh Giri, Kendrick M. Smith
KSZ velocity reconstruction is a recently proposed method for mapping the largest-scale modes of the universe, by applying a quadratic estimator to the small-scale CMB…
KSZ tomography and the bispectrum
Kendrick M. Smith, Mathew S. Madhavacheril, Moritz Münchmeyer +3
Several statistics have been proposed for measuring the kSZ effect by combining the small-scale CMB with galaxy surveys. We review five such statistics, and show that they are all…