401 citations · 2.8k across the 57 of their papers we have counts for
57 papers
Intrinsic Alignments in Redshift Space I: Symmetries
Kazuyuki Akitsu, Shi-Fan Chen, Zvonimir Vlah
Galaxy shapes are unique tensor tracers of large-scale structure, providing a promising avenue to both enhance current cosmological programs and detect new physics beyond the scala…
Galaxy bias renormalization: Two-loop Power Spectrum, One-loop Trispectrum and Bispectrum
Thomas Bakx, Mathias Garny, Henrique Rubira +1
We present a complete treatment of fifth-order renormalized galaxy bias at the one- and two-loop level in real space, including gradient corrections to deterministic bias operators…
Efficient computation of the galaxy angular bispectrum in redshift space
Zucheng Gao, Zvonimir Vlah, Anthony Challinor
Efficient computation of the angular bispectrum is an essential part of modelling large-scale structure observations, but it still remains an extremely challenging task. In this wo…
Testing parity with composite-field spectra of BOSS and DESI luminous red galaxies
Zucheng Gao, Marina S. Cagliari, Azadeh Moradinezhad Dizgah +1
Detection of parity violation on cosmological scales would have profound implications for fundamental physics. Motivated in part by recent measurements of parity-odd four-point cor…
Parity in Composite-Field Galaxy Correlators
Zucheng Gao, Azadeh Moradinezhad Dizgah, Zvonimir Vlah
Detecting parity violation on cosmological scales would provide a striking clue to new physics. Large-scale structure offers the raw statistical power -- many three-dimensional mod…
Rapid cosmological inference with the two-loop matter power spectrum
Thomas Bakx, Henrique Rubira, Nora Elisa Chisari +1
We compute the two-loop effective field theory (EFT) power spectrum of dark matter density fluctuations in CDM using the recently proposed COBRA method (Bakx. et al, 2025). With…
One-Loop Galaxy Bispectrum: Consistent Theory, Efficient Analysis with COBRA, and Implications for Cosmological Parameters
Thomas Bakx, Mikhail M. Ivanov, Oliver H. E. Philcox +1
We present an efficient and accurate pipeline for the analysis of the redshift-space galaxy bispectrum multipoles at one-loop order in effective field theory (EFT). We provide a sy…
Two-loop renormalization and running of galaxy bias
Thomas Bakx, Mathias Garny, Henrique Rubira +1
We systematically extend the framework of galaxy bias renormalization to two-loop order. For the minimal complete basis of 29 deterministic bias operators up to fifth order in the…
The Bispectrum of Intrinsic Alignments: II. Precision Comparison Against Dark Matter Simulations
Thomas Bakx, Toshiki Kurita, Alexander Eggemeier +2
We measure three-dimensional bispectra of halo intrinsic alignments (IA) and dark matter overdensities in real space from N-body simulations for halos of mass $10^{12}-10^{12.5} M_…
The Bispectrum of Intrinsic Alignments: Theory Modelling and Forecasts for Stage IV Galaxy Surveys
Thomas Bakx, Alexander Eggemeier, Toshiki Kurita +2
We present a complete treatment of the bispectrum of intrinsic alignments, both in three spatial dimensions and in projection in the flat-sky approximation. Since intrinsic alignme…
Observed unequal-time power spectrum
Francesco Spezzati, Eleonora Vanzan, Alvise Raccanelli +2
The next generation of galaxy surveys will provide highly precise measurements of galaxy clustering, therefore requiring a corresponding accuracy. Current approaches, which rely on…
Projecting Unequal Time Fields and Correlators of Large Scale Structure
Theodore Steele, Alvise Raccanelli, Zvonimir Vlah
Many large scale structure surveys sort their observations into redshift bins and treat every tracer as being located at the mean redshift of its bin, a treatment which we refer to…
COBRA: Optimal Factorization of Cosmological Observables
Thomas Bakx, Nora Elisa Chisari, Zvonimir Vlah
We introduce COBRA (Cosmology with Optimally factorized Bases of Radial Approximants), a novel framework for rapid computation of large-scale structure observables. COBRA separates…
The Bispectrum in Lagrangian Perturbation Theory
Shi-Fan Chen, Zvonimir Vlah, Martin White
We study the bispectrum in Lagrangian perturbation theory. Extending past results for the power spectrum, we describe a method to efficiently compute the bispectrum in LPT, focusin…
Euclid preparation. XLI. Galaxy power spectrum modelling in real space
Euclid Collaboration, A. Pezzotta, C. Moretti +246
We investigate the accuracy of the perturbative galaxy bias expansion in view of the forthcoming analysis of the Euclid spectroscopic galaxy samples. We compare the performance of…
Flat-sky Angular Power Spectra Revisited
Zucheng Gao, Zvonimir Vlah, Anthony Challinor
We revisit the flat-sky approximation for evaluating the angular power spectra of projected random fields by retaining information about the correlations along the line of sight. W…
On the asymptotic connection between full- and flat-sky angular correlators
Zucheng Gao, Alvise Raccanelli, Zvonimir Vlah
We investigate the connection between the full- and flat-sky angular power spectra. First, we revisit this connection established on the geometric and physical grounds, namely that…
The observed power spectrum & frequency-angular power spectrum
Alvise Raccanelli, Zvonimir Vlah
The two-point summary statistics is one of the most commonly used tools in the study of cosmological structure. Starting from the theoretical power spectrum defined in the 3D volum…
Optimizing the Evolution of Perturbations in the CDM Universe
Nicholas Choustikov, Zvonimir Vlah, Anthony Challinor
Perturbation theory is a powerful tool for studying large-scale structure formation in the universe and calculating observables such as the power spectrum or bispectrum. However, b…
Effective Field Theory of Intrinsic Alignments at One Loop Order: a Comparison to Dark Matter Simulations
Thomas Bakx, Toshiki Kurita, Nora Elisa Chisari +2
We test the regime of validity of the effective field theory (EFT) of intrinsic alignments (IA) at the one-loop level by comparing with 3D halo shape statistics in N-body simulatio…
Perturbation theory of LSS in the CDM Universe: exact time evolution and the two-loop power spectrum
Matteo Fasiello, Tomohiro Fujita, Zvonimir Vlah
We derive exact analytic solutions for density and velocity fields to all orders in Eulerian standard perturbation theory for CDM cosmology. In particular, we show that density…
A new analysis of galaxy 2-point functions in the BOSS survey, including full-shape information and post-reconstruction BAO
Shi-Fan Chen, Zvonimir Vlah, Martin White
We present a new method for consistent, joint analysis of the pre- and post-reconstruction two-point functions of the BOSS survey. The post-reconstruction correlation function is u…
The Ly forest flux correlation function: a perturbation theory perspective
Shi-Fan Chen, Zvonimir Vlah, Martin White
The Ly forest provides one of the best means of mapping large-scale structure at high redshift, including our tightest constraint on the distance-redshift relation before cosmic…
Galaxy shape statistics in the effective field theory
Zvonimir Vlah, Nora Elisa Chisari, Fabian Schmidt
Intrinsic galaxy alignments yield an important contribution to the observed statistics of galaxy shapes. The general bias expansion for galaxy sizes and shapes in three dimensions…