305 citations · 2.5k across the 92 of their papers we have counts for
86 papers · 1 filter
Full-Shape Analysis of the Redshift-Space Galaxy Trispectrum in the EFTofLSS
Beatriz Tucci, Oliver H. E. Philcox
The effective field theory of large-scale structure (EFTofLSS) program for spectroscopic galaxy surveys has been remarkably successful for cosmological inference from the galaxy po…
or : DESI constraints on relative baryon-CDM perturbations
Ananda F. Smith, Mikhail M. Ivanov, Roger de Belsunce +3
We carry out a search for the relative baryon-cold dark matter (CDM) density and velocity modes in the DESI full-shape (FS) data, and investigate whether DESI's preference for evol…
Inflation, Open Universes, and Dark Energy
Anton Chudaykin, Mikhail M. Ivanov, Renata Kallosh +3
We study the impact of spatial curvature () and dynamical dark energy (parametrized by and ) on the spectral index using a combination of cosmic microwave bac…
Dissecting the Scalar Cosmological Collider with the Cosmic Microwave Background
Oliver H. E. Philcox
The cosmological collider program probes ultra-high-energy physics by searching for subtle oscillatory signatures induced by inflationary particle exchange. Due to the non-linear s…
Searching for Folded Primordial Non-Gaussianity with Galaxy Surveys
Si-Xiang Yang, Oliver H. E. Philcox
Large-scale structure provides a powerful probe of inflationary physics through primordial non-Gaussianity (PNG): the galaxy power spectrum depends on local PNG through scale-depen…
The Limitations of Cosmological Collider Analyses
Oliver H. E. Philcox
Massive fields exchanged during inflation source cosmological collider features in the correlators of primordial curvature fluctuations. While their structure is fixed by the symme…
Probing inflationary particle production with the CMB power spectrum
Hidde T. Jense, Luca H. Abu El-Haj, J. Colin Hill +1
Particle production is common to many microphysical models of inflation and can imprint observable features in the cosmic microwave background (CMB) anisotropies. We consider a sce…
The Atacama Cosmology Telescope: A Test of the Gravitational Force Law on Cosmological Scales Using the Kinematic Sunyaev-Zeldovich Effect
Patricio A. Gallardo, Kris Pardo, Oliver H. E. Philcox +38
The mean pairwise velocity of massive halos reflects the gravitational force law on cosmic scales. We combine cosmic microwave background intensity maps from the Atacama Cosmology…
Cosmic Shear in Effective Field Theory at Two-Loop Order: Revisiting in Dark Energy Survey Data
Shi-Fan Chen, Joseph DeRose, Mikhail M. Ivanov +1
Cosmic shear is a powerful probe of cosmological distances, matter abundance and clustering in the low-redshift Universe. Cosmological parameter extraction from cosmic shear data i…
Searching for Unparticles with the Cosmic Microwave Background
Oliver H. E. Philcox, Guilherme L. Pimentel, Chen Yang
Multi-field models of inflation typically assume that interactions between particles can be treated perturbatively. Strongly-coupled models provide an intriguing alternative and ma…
What Shape is the Inflationary Bispectrum?
Oliver H. E. Philcox
Non-linear interactions during inflation generate non-Gaussianities in the distribution of primordial curvature. In many theories, the physics is scale-invariant, such that the ind…
Reanalyzing DESI DR1: 5. Cosmological Constraints with Simulation-Based Priors
Anton Chudaykin, Mikhail M. Ivanov, Oliver H. E. Philcox
We analyze the public DESI full-shape clustering data using simulation-based priors (SBPs). Our priors are obtained by fitting normalizing flows to the distribution of EFT paramete…
Reanalyzing DESI DR1: 4. Percent-Level Cosmological Constraints from Combined Probes and Robust Evidence for the Normal Neutrino Mass Hierarchy
Mikhail M. Ivanov, James M. Sullivan, Roger de Belsunce +4
We present cosmological parameter measurements from the full combination of DESI DR1 galaxy clustering data, described with large-scale structure effective field theory. By incorpo…
Reanalyzing DESI DR1: 3. Constraints on Inflation from Galaxy Power Spectra & Bispectra
Anton Chudaykin, Mikhail M. Ivanov, Oliver H. E. Philcox
Models of cosmic inflation generically predict a weak but potentially detectable amount of primordial non-Gaussianity (PNG), which can be used to obtain insights into the degrees o…
Separating the Inseparable: Constraining Arbitrary Primordial Bispectra with Cosmic Microwave Background Data
Oliver H. E. Philcox, Kunhao Zhong, Salvatore Samuele Sirletti
To efficiently probe primordial non-Gaussianity using Cosmic Microwave Background (CMB) data, we require theoretical predictions that are factorizable, \textit{i.e.}\ those whose k…
Reanalyzing DESI DR1: 2. Constraints on Dark Energy, Spatial Curvature, and Neutrino Masses
Anton Chudaykin, Mikhail M. Ivanov, Oliver H. E. Philcox
We carry out an independent re-analysis of the Dark Energy Spectroscopic Instrument (DESI) public dataset, focusing on extensions to the standard cosmological model, CDM. Utiliz…
Constraining Inflationary Particle Production with CMB Polarization
Luca H. Abu El-Haj, Oliver H. E. Philcox, J. Colin Hill
Following Philcox et al. (2025), we investigate a scenario with a massive partner to the inflaton ( times the inflationary Hubble scale), in which particles are produced du…
Quantum stress-energy at timelike boundaries: testing a new beyond-CDM parameter with cosmological data
Oliver H. E. Philcox, Eva Silverstein, Gonzalo Torroba
We analyze the basic cosmological effects of a population of timelike boundaries -- a form of nontrivial spacetime topology -- containing a boundary layer of quantum stress energy.…
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…
Reanalyzing DESI DR1: 1. CDM Constraints from the Power Spectrum and Bispectrum
Anton Chudaykin, Mikhail M. Ivanov, Oliver H. E. Philcox
We present the first independent re-analysis of the galaxy clustering data from DESI Data Release 1, utilizing an effective field theory full-shape model. We analyze the power spec…
Modeling Galaxy Surveys with Hybrid SBI
Gemma Zhang, Chirag Modi, Oliver H. E. Philcox
Simulation-based inference (SBI) has emerged as a powerful tool for extracting cosmological information from galaxy surveys deep into the non-linear regime. Despite its great promi…
Wonderings on Wiggly Bispectra: Non-linear Evolution and Reconstruction of Oscillations in the Squeezed Bispectrum
Samuel Goldstein, Oliver H. E. Philcox, Emanuele Fondi +1
Oscillations in the primordial bispectrum are sourced by a range of inflationary phenomena, including features in the inflaton potential and interactions with massive fields throug…
The ISW-Lensing Bispectrum & Trispectrum
Oliver H. E. Philcox, J. Colin Hill
Due to the integrated Sachs-Wolfe (ISW) effect, cosmic microwave background (CMB) temperature and polarization fluctuations are correlated with the gravitational lensing potential.…
The Spectroscopic Stage-5 Experiment
Robert Besuner, Arjun Dey, Alex Drlica-Wagner +106
The existence, properties, and dynamics of the dark sectors of our universe pose fundamental challenges to our current model of physics, and large-scale astronomical surveys may be…