Bio


Junior Fellow, Simons Society of Fellows (2022 - 2025)
Ph.D., Princeton University (2022)
M.A. (Cantab.), Cambridge University (2018)

I’m broadly interested in theoretical, statistical, and observational cosmology, particularly as applied to galaxy surveys and the Cosmic Microwave Background. Recently, I have worked on measuring, modeling, and interpreting new and old physics in a range of cosmological datasets, and using them to learn about the early Universe, including inflation. With Mikhail Ivanov and Marko Simonovic, I won the 2024 New Horizons Prize in Physics, for work on the Effective Field Theory of Large Scale Structure.

I am an assistant professor in the Physics department, affiliated with both the Kavli Institute for Particle Astrophysics and Cosmology (KIPAC) and the Leinweber Institute for Theoretical Physics at Stanford (LITP). Please send me an email if you're interested in working with me!

Academic Appointments


2025-26 Courses


Stanford Advisees


All Publications


  • Reanalyzing DESI DR1. III. Constraints on inflation from galaxy power spectra and bispectra PHYSICAL REVIEW D Chudaykin, A., Ivanov, M. M., Philcox, O. H. E. 2026; 113 (6)

    View details for DOI 10.1103/fhj3-6q4x

    View details for Web of Science ID 001721922000001

  • Reanalyzing DESI DR1. I. ΛCDM constraints from the power spectrum and bispectrum PHYSICAL REVIEW D Chudaykin, A., Ivanov, M. M., Philcox, O. H. E. 2026; 113 (6)

    View details for DOI 10.1103/qsnt-dppc

    View details for Web of Science ID 001711188500001

  • Quantum stress-energy at timelike boundaries: Testing a new beyond-ΛCDM parameter with cosmological data PHYSICAL REVIEW D Philcox, O. H. E., Silverstein, E., Torroba, G. 2026; 113 (4)

    View details for DOI 10.1103/162y-rmsv

    View details for Web of Science ID 001705986000006

  • Modeling galaxy surveys with hybrid simulation-based inference PHYSICAL REVIEW D Zhang, G., Modi, C., Philcox, O. H. E. 2026; 113 (4)

    View details for DOI 10.1103/zj8s-v23z

    View details for Web of Science ID 001697993500003

  • Wonderings on wiggly bispectra: Nonlinear evolution and reconstruction of oscillations in the squeezed bispectrum PHYSICAL REVIEW D Goldstein, S., Philcox, O. H. E., Fondi, E., Coulton, W. R. 2025; 112 (8)

    View details for DOI 10.1103/q8m3-vspd

    View details for Web of Science ID 001598985600006

  • Suite of optimal and efficient power spectrum and bispectrum estimators for large-scale structure analyses PHYSICAL REVIEW D Philcox, O. H. E., Floss, T. 2025; 112 (6)

    View details for DOI 10.1103/rr6c-cf3s

    View details for Web of Science ID 001571301500005

  • A Parameter-masked Mock Data Challenge for Beyond-two-point Galaxy Clustering Statistics ASTROPHYSICAL JOURNAL Krause, E., Kobayashi, Y., Salcedo, A. N., Ivanov, M. M., Abel, T., Akitsu, K., Angulo, R. E., Cabass, G., Contarini, S., Cuesta-Lazaro, C., Hahn, C., Hamaus, N., Jeong, D., Modi, C., Nguyen, N., Nishimichi, T., Paillas, E., Ibanez, M., Philcox, O. H. E., Pisani, A., Schmidt, F., Tanaka, S., Verza, G., Yuan, S., Zennaro, M. 2025; 990 (2)
  • Searching for inflationary physics with the CMB trispectrum. II. Code and validation PHYSICAL REVIEW D Philcox, O. H. E. 2025; 111 (12)

    View details for DOI 10.1103/bprw-3zj1

    View details for Web of Science ID 001514484300016

  • Searching for inflationary physics with the CMB trispectrum. I. Primordial theory and optimal estimators PHYSICAL REVIEW D Philcox, O. H. E. 2025; 111 (12)

    View details for DOI 10.1103/wkj2-q62t

    View details for Web of Science ID 001514484300011

  • Searching for inflationary physics with the CMB trispectrum. III. Constraints from<i> Planck</i> PHYSICAL REVIEW D Philcox, O. H. E. 2025; 111 (12)

    View details for DOI 10.1103/y81z-g7th

    View details for Web of Science ID 001514484300005

  • Integrated Sachs-Wolfe lensing bispectrum and trispectrum PHYSICAL REVIEW D Philcox, O. H. E., Hill, J. 2025; 111 (12)

    View details for DOI 10.1103/wsjw-32l6

    View details for Web of Science ID 001523437700011

  • Non-Gaussianity beyond the scalar sector: A search for tensor and mixed tensor-scalar bispectra with Planck data PHYSICAL REVIEW D Philcox, O. H. E., Shiraishi, M. 2025; 111 (12)

    View details for DOI 10.1103/pb7x-lp19

    View details for Web of Science ID 001511064200008

  • Searching for inflationary particle production in<i> Planck</i> data PHYSICAL REVIEW D Philcox, O. H. E., Kumar, S., Hill, J. 2025; 111 (10)
  • BOSS constraints on massive particles during inflation: The cosmological collider in action PHYSICAL REVIEW D Cabass, G., Philcox, O. H. E., Ivanov, M. M., Akitsu, K., Chen, S., Simonovi, M., Zaldarriaga, M. 2025; 111 (6)
  • Could sample variance be responsible for the parity-violating signal seen in the Baryon Oscillation Spectroscopic Survey? PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES Philcox, O. E., Ereza, J. 2025; 383 (2290): 20240034

    Abstract

    Recent works have uncovered an excess signal in the parity-odd four-point correlation function measured from the Baryon Oscillation Spectroscopic Survey (BOSS) galaxy catalogue. If physical in origin, this could indicate new parity-breaking processes in inflation. At heart, these studies compare the observed four-point correlator with the distribution obtained from parity-conserving mock galaxy surveys; if the simulations underestimate the covariance of the data, noise fluctuations may be misinterpreted as a signal. To test this, we reanalyse the BOSS CMASS parity-odd dataset with the noise distribution model using the newly developed GLAM-Uchuu suite of mocks. These comprise full [Formula: see text]-body simulations that follow the evolution of [Formula: see text] dark matter particles and represent a significant upgrade compared with the formerly used MultiDark-Patchy mocks, which were based on an alternative (non [Formula: see text]-body) gravity solver. We find no significant evidence for parity-violation (with a baseline detection significance of [Formula: see text]), suggesting that the former signal ([Formula: see text] with our data cuts) could be caused by an underestimation of the covariance in MultiDark-Patchy. The significant differences between results obtained with the two sets of BOSS-calibrated galaxy catalogues (whose covariances differ at the [Formula: see text] level) showcase the heightened sensitivity of beyond-two-point analyses to nonlinear effects and indicate that previous constraints may suffer from large systematic uncertainties.This article is part of the discussion meeting issue 'Challenging the standard cosmological model'.

    View details for DOI 10.1098/rsta.2024.0034

    View details for Web of Science ID 001428238700006

    View details for PubMedID 39938550

    View details for PubMedCentralID PMC12169525

  • Suppression without Thawing: Constraining Structure Formation and Dark Energy with Galaxy Clustering PHYSICAL REVIEW LETTERS Chen, S., Ivanov, M. M., Philcox, O. H. E., Wenzl, L. 2024; 133 (23): 231001

    Abstract

    We present a new perturbative full-shape analysis of BOSS galaxy clustering data, including the full combination of the galaxy power spectrum and bispectrum multipoles, baryon acoustic oscillations, and cross-correlations with the gravitational lensing of cosmic microwave background measured from Planck. Assuming the ΛCDM model, we constrain the matter density fraction Ω_{m}=0.3138±0.0086, the Hubble constant H_{0}=68.23±0.78  km s^{-1} Mpc^{-1}, and the mass fluctuation amplitude σ_{8}=0.688±0.026 (equivalent to S_{8}=0.703±0.029). Cosmic structure at low redshifts appears suppressed with respect to the Planck ΛCDM concordance model at 4.5σ. We explore the implications of this dataset for the recent DESI BAO preference for dynamical dark energy (DDE): the BOSS data combine with DESI BAO and PantheonPlus supernovae competitively compared to the CMB, yielding no preference for DDE, but the same ∼10% suppression of structure, with dark energy being consistent with a cosmological constant at 68% CL. Our results suggest that either the data contains residual systematics, or more model-building efforts may be required to restore cosmological concordance.

    View details for DOI 10.1103/PhysRevLett.133.231001

    View details for Web of Science ID 001376943000002

    View details for PubMedID 39714644

  • Intermediate mass-range particles from small scales: Nonperturbative techniques for cosmological collider physics from large-scale structure surveys PHYSICAL REVIEW D Goldstein, S., Philcox, O. H. E., Hill, J., Hui, L. 2024; 110 (8)
  • The 3D Lyman-α forest power spectrum from eBOSS DR16 MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY de Belsunce, R., Philcox, O. H. E., Irsic, V., McDonald, P., Guy, J., Palanque-Delabrouille, N. 2024; 533 (3): 3756-3770
  • Testing parity symmetry with the polarized cosmic microwave background PHYSICAL REVIEW D Philcox, O. H. E., Shiraishi, M. 2024; 109 (8)
  • What can galaxy shapes tell us about physics beyond the standard model? PHYSICAL REVIEW D Philcox, O. H. E., Konig, M. J., Alexander, S., Spergel, D. N. 2024; 109 (6)
  • Testing graviton parity and Gaussianity with Planck T-, E-, and B-mode bispectra PHYSICAL REVIEW D Philcox, O. H. E., Shiraishi, M. 2024; 109 (6)
  • Consistently constraining fNL with the squeezed lensing bispectrum using consistency relations PHYSICAL REVIEW D Goldstein, S., Philcox, O. H. E., Hill, J., Esposito, A., Hui, L. 2024; 109 (4)
  • Signatures of a parity-violating universe PHYSICAL REVIEW D Coulton, W. R., Philcox, O. H. E., Villaescusa-Navarro, F. 2024; 109 (2)
  • Do the CMB Temperature Fluctuations Conserve Parity? PHYSICAL REVIEW LETTERS Philcox, O. H. E. 2023; 131 (18): 181001

    Abstract

    Observations of the cosmic microwave background (CMB) have cemented the notion that the large-scale Universe is both statistically homogeneous and isotropic. But is it invariant also under reflections? To probe this we require parity-sensitive statistics: for scalar observables, the simplest is the trispectrum. We make the first measurements of the parity-odd scalar CMB, focusing on the large-scale (2<ℓ<510) temperature anisotropies measured by Planck. This is facilitated by new quasi-maximum-likelihood estimators for binned correlators, which account for mask convolution and leakage between even- and odd-parity components, and achieve ideal variances within ≈20%. We perform a blind test for parity violation by comparing a χ^{2} statistic from Planck to theoretical expectations, using two suites of simulations to account for the possible likelihood non-Gaussianity and residual foregrounds. We find consistency at the ≈0.4σ level, yielding no evidence for novel early-Universe phenomena. The measured trispectra allow for a wealth of new physics to be constrained; here, we use them to constrain eight primordial models, including ghost inflation, cosmological collider scenarios, and Chern-Simons gauge fields. We find no signatures of new physics, with a maximal detection significance of 2.0σ. Our results also indicate that the recent parity excesses seen in the BOSS galaxy survey are not primordial in origin, given that the CMB dataset contains roughly 250× more primordial modes, and is far easier to interpret, given the linear physics, Gaussian statistics, and accurate mocks. Tighter CMB constraints can be wrought by including smaller scales (though rotational invariance washes out the flat-sky limit) and adding polarization data.

    View details for DOI 10.1103/PhysRevLett.131.181001

    View details for Web of Science ID 001640051900001

    View details for PubMedID 37977606

  • Parity-violating trispectrum from Chern-Simons gravity JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS Creque-Sarbinowski, C., Alexander, S., Kamionkowski, M., Philcox, O. 2023
  • Optimal estimation of the binned mask-free power spectrum, bispectrum, and trispectrum on the full sky: Tensor edition PHYSICAL REVIEW D Philcox, O. H. E. 2023; 108 (6)
  • Optimal estimation of the binned mask-free power spectrum, bispectrum, and trispectrum on the full sky: Scalar edition PHYSICAL REVIEW D Philcox, O. H. E. 2023; 107 (12)
  • Ultra-light axions and the S8 tension: joint constraints from the cosmic microwave background and galaxy clustering JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS Rogers, K. K., Hlozek, R., Lague, A., Ivanov, M. M., Philcox, O. H. E., Cabass, G., Akitsu, K., Marsh, D. J. E. 2023
  • Accurate estimation of angular power spectra for maps with correlated masks PHYSICAL REVIEW D Surrao, K. M., Philcox, O. H. E., Hill, J. 2023; 107 (8)
  • Constraining single-field inflation with MegaMapper PHYSICS LETTERS B Cabass, G., Ivanov, M. M., Philcox, O. H. E., Simonovic, M., Zaldarriaga, M. 2023; 841
  • Cosmology with the galaxy bispectrum multipoles: Optimal estimation and application to BOSS data PHYSICAL REVIEW D Ivanov, M. M., Philcox, O. H. E., Cabass, G., Nishimichi, T., Simonovic, M., Zaldarriaga, M. 2023; 107 (8)
  • The CAMELS Project: Public Data Release ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES Villaescusa-Navarro, F., Genel, S., Angles-Alcazar, D., Perez, L. A., Villanueva-Domingo, P., Wadekar, D., Shao, H., Mohammad, F. G., Hassan, S., Moser, E., Lau, E. T., Valle, L., Nicola, A., Thiele, L., Jo, Y., Philcox, O. H. E., Oppenheimer, B. D., Tillman, M., Hahn, C., Kaushal, N., Pisani, A., Gebhardt, M., Delgado, A., Caliendo, J., Kreisch, C., Wong, K. W. K., Coulton, W. R., Eickenberg, M., Parimbelli, G., Ni, Y., Steinwandel, U. P., La Torre, V., Dave, R., Battaglia, N., Nagai, D., Spergel, D. N., Hernquist, L., Burkhart, B., Narayanan, D., Wandelt, B., Somerville, R. S., Bryan, G. L., Viel, M., Li, Y., Irsic, V., Kraljic, K., Marinacci, F., Vogelsberger, M. 2023; 265 (2)
  • A uniform spherical goat (problem): explicit solution for homologous collapse's radial evolution in time MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Slepian, Z., Philcox, O. H. E. 2023; 522 (1): L42-L45
  • Disordered Heterogeneous Universe: Galaxy Distribution and Clustering across Length Scales PHYSICAL REVIEW X Philcox, O. H. E., Torquato, S. 2023; 13 (1)
  • Colliders and ghosts: Constraining inflation with the parity-odd galaxy four-point function PHYSICAL REVIEW D Cabas, G., Ivanov, M. M., Philcox, O. H. E. 2023; 107 (2)
  • Squeezing f<sub>NL</sub> out of the matter bispectrum with consistency relations PHYSICAL REVIEW D Goldstein, S., Esposito, A., Philcox, O. H. E., Hui, L., Hill, J., Scoccimarro, R., Abitbol, M. H. 2022; 106 (12)
  • Novel cosmological tests from combining galaxy lensing and the polarized Sunyaev-Zel'dovich effect PHYSICAL REVIEW D Philcox, O. H. E., Johnson, M. C. 2022; 106 (8)
  • Determining the Hubble constant without the sound horizon: A 3.6% constraint on <i>H</i><sub>0</sub> from galaxy surveys, CMB lensing, and supernovae PHYSICAL REVIEW D Philcox, O. H. E., Farren, G. S., Sherwin, B. D., Baxter, E. J., Brout, D. J. 2022; 106 (6)
  • Probing parity violation with the four-point correlation function of BOSS galaxies PHYSICAL REVIEW D Philcox, O. H. E. 2022; 106 (6)
  • Cosmology with the redshift-space galaxy bispectrum monopole at one-loop order PHYSICAL REVIEW D Philcox, O. H. E., Ivanov, M. M., Cabass, G., Simonovic, M., Zaldarriaga, M., Nishimichi, T. 2022; 106 (4)
  • Efficient computation of <i>N</i>-point correlation functions in <i>D</i> dimensions PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Philcox, O. H. E., Slepian, Z. 2022; 119 (33): e2111366119

    Abstract

    We present efficient algorithms for computing the N-point correlation functions (NPCFs) of random fields in arbitrary D-dimensional homogeneous and isotropic spaces. Such statistics appear throughout the physical sciences and provide a natural tool to describe stochastic processes. Typically, algorithms for computing the NPCF components have [Formula: see text] complexity (for a dataset containing n particles); their application is thus computationally infeasible unless N is small. By projecting the statistic onto a suitably defined angular basis, we show that the estimators can be written in a separable form, with complexity [Formula: see text] or [Formula: see text] if evaluated using a Fast Fourier Transform on a grid of size [Formula: see text]. Our decomposition is built upon the D-dimensional hyperspherical harmonics; these form a complete basis on the [Formula: see text] sphere and are intrinsically related to angular momentum operators. Concatenation of [Formula: see text] such harmonics gives states of definite combined angular momentum, forming a natural separable basis for the NPCF. As N and D grow, the number of basis components quickly becomes large, providing a practical limitation to this (and all other) approaches: However, the dimensionality is greatly reduced in the presence of symmetries; for example, isotropic correlation functions require only states of zero combined angular momentum. We provide a Julia package implementing our estimators and show how they can be applied to a variety of scenarios within cosmology and fluid dynamics. The efficiency of such estimators will allow higher-order correlators to become a standard tool in the analysis of random fields.

    View details for DOI 10.1073/pnas.2111366119

    View details for Web of Science ID 000891285100003

    View details for PubMedID 35939667

    View details for PubMedCentralID PMC9388109

  • Constraints on multifield inflation from the BOSS galaxy survey PHYSICAL REVIEW D Cabass, G., Ivanov, M. M., Philcox, O. H. E., Simonovic, M., Zaldarriaga, M. 2022; 106 (4)
  • Analytic Gaussian covariance matrices for galaxy <i>N</i>-point correlation functions PHYSICAL REVIEW D Hou, J., Cahn, R. N., Philcox, O. H. E., Slepian, Z. 2022; 106 (4)
  • Constraints on Single-Field Inflation from the BOSS Galaxy Survey PHYSICAL REVIEW LETTERS Cabass, G., Ivanov, M. M., Philcox, O. H. E., Simonovi, M., Zaldarriaga, M. 2022; 129 (2): 021301

    Abstract

    Nonlocal primordial non-Gaussianity (NLPNG) is a smoking gun of interactions in single-field inflationary models and can be written as a combination of the equilateral and orthogonal templates. We present the first constraints on these from the redshift-space galaxy power spectra and bispectra of the BOSS data. These are the first such measurements independent of the cosmic microwave background fluctuations. We perform a consistent analysis that includes all necessary nonlinear corrections generated by NLPNG and vary all relevant cosmological and nuisance parameters in a global fit to the data. Our conservative analysis yields joint limits on the amplitudes of the equilateral and orthogonal shapes, f_{NL}^{equil}=940±600 and f_{NL}^{ortho}=-170±170 (both at 68% CL). These can be used to derive constraints on coefficients of the effective single-field inflationary Lagrangian; in particular, we find that the sound speed of inflaton fluctuations has the bound c_{s}≥0.013 at 95% CL. Fixing the quadratic galaxy bias and cosmological parameters, the constraints can be tightened to f_{NL}^{equil}=260±300 and f_{NL}^{ortho}=-23±120 (68% CL).

    View details for DOI 10.1103/PhysRevLett.129.021301

    View details for Web of Science ID 000828087900023

    View details for PubMedID 35867436

  • Cosmology intertwined: A review of the particle physics, astrophysics, and cosmology associated with the cosmological tensions and anomalies JOURNAL OF HIGH ENERGY ASTROPHYSICS Abdalla, E., Abellan, G., Aboubrahim, A., Agnello, A., Akarsu, O., Akrami, Y., Alestas, G., Aloni, D., Amendola, L., Anchordoqui, L. A., Anderson, R. I., Arendse, N., Asgari, M., Ballardini, M., Bargerx, V., Basilakos, S., Batista, R. C., Battistelli, E. S., Battye, R., Benetti, M., Benisty, D., Berlin, A., de Bernardis, P., Berti, E., Bidenko, B., Birrer, S., Blakeslee, J. P., Boddy, K. K., Bom, C. R., Bonilla, A., Borghi, N., Bouchet, F. R., Braglia, M., Buchert, T., Buckley-Geer, E., Calabrese, E., Caldwell, R. R., Camarena, D., Capozziello, S., Casertano, S., Chen, A., Chen, G., Chen, H., Chluba, J., Chudaykin, A., Cicoli, M., Copi, C. J., Courbin, F., Cyr-Racine, F., Czerny, B., Dainotti, M., D'Amico, G., Davis, A., Perez, J., de Haro, J., Delabrouille, J., Denton, P. B., Dhawan, S., Dienes, K. R., Di Valentino, E., Du, P., Eckert, D., Escamilla-Rivera, C., Ferte, A., Finelli, F., Fosalba, P., Freedman, W. L., Frusciante, N., Gaztanaga, E., Giare, W., Giusarma, E., Gomez-Valent, A., Handley, W., Harrison, I., Hart, L., Hazra, D., Heavens, A., Heinesen, A., Hildebrandt, H., Hill, J., Hogg, N. B., Holz, D. E., Hooper, D. C., Hosseininejad, N., Huterer, D., Ishak, M., Ivanov, M. M., Jaffe, A. H., Jang, I., Jedamzik, K., Jimenez, R., Joseph, M., Joudaki, S., Kamionkowski, M., Karwal, T., Kazantzidis, L., Keeley, R. E., Klasen, M., Komatsu, E., Koopmans, L. V. E., Kumar, S., Lamagna, L., Dn, R., Lee, C., Lesgourgues, J., Said, J., Lewis, T. R., L'Huillier, B., Lucca, M., Maartens, R., Macri, L. M., Marfatia, D., Marra, V., Martins, C. P., Masi, S., Matarrese, S., Mazumdar, A., Melchiorri, A., Mena, O., Mersini-Houghton, L., Mertens, J., Milakovic, D., Minami, Y., Miranda, V., Moreno-Pulido, C., Moresco, M., Mota, D. F., Mottola, E., Mozzon, S., Muir, J., Mukherjee, A., Mukherjee, S., Naselsky, P., Nath, P., Nesseris, S., Niedermann, F., Notari, A., Nunes, R. C., Colgain, E. O., Owens, K. A., Ozulker, E., Pace, F., Paliathanasis, A., Palmese, A., Pan, S., Paoletti, D., Bergliaffa, S., Perivolaropoulos, L., Pesce, D. W., Pettorino, V., Philcox, O. H. E., Pogosian, L., Poulin, V., Poulot, G., Raveri, M., Reid, M. J., Renzi, F., Riess, A. G., Sabla, V., Salucci, P., Salzano, V., Saridakis, E. N., Sathyaprakash, B. S., Schmaltz, M., Schoneberg, N., Scolnic, D., Sen, A. A., Sehgal, N., Shafieloo, A., Sheikh-Jabbari, M. M., Silk, J., Silvestri, A., Skaraj, F., Sloth, M. S., Soares-Santos, M., Peracaula, J., Songsheng, Y., Soriano, J. F., Staicova, D., Starkman, G. D., Szapudi, I., Teixeira, E. M., Thomas, B., Treu, T., Trott, E., van de Ruck, C., Vazquez, J., Verde, L., Visinelli, L., Wang, D., Wang, J., Wang, S., Watkins, R., Watson, S., Webb, J. K., Weiner, N., Weltman, A., Witte, S. J., Wojtak, R., Yadav, A., Yang, W., Zhao, G., Zumalacarregui, M. 2022; 34: 49-211
  • Precision analysis of the redshift-space galaxy bispectrum PHYSICAL REVIEW D Ivanov, M. M., Philcox, O. H. E., Nishimichi, T., Simonovic, M., Takada, M., Zaldarriaga, M. 2022; 105 (6)
  • Determining the Hubble constant without the sound horizon: Perspectives PHYSICAL REVIEW D Farren, G. S., Philcox, O. H. E., Sherwin, B. D. 2022; 105 (6)
  • Cosmological constraints without nonlinear redshift-space distortions PHYSICAL REVIEW D Ivanov, M. M., Philcox, O. H. E., Simonovic, M., Zaldarriaga, M., Nischimichi, T., Takada, M. 2022; 105 (4)
  • BOSS DR12 full-shape cosmology: ΛCDM constraints from the large-scale galaxy power spectrum and bispectrum monopole PHYSICAL REVIEW D Philcox, O. H. E., Ivanov, M. M. 2022; 105 (4)
  • Cosmology without window functions. II. Cubic estimators for the galaxy bispectrum PHYSICAL REVIEW D Philcox, O. H. E. 2021; 104 (12)
  • encore: an <i>O</i> (<i>N</i><sub>g</sub><SUP>2</SUP>) estimator for galaxy <i>N</i>-point correlation functions MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Philcox, O. H. E., Slepian, Z., Hou, J., Warner, C., Cahn, R. N., Eisenstein, D. J. 2022; 509 (2): 2457-2481
  • An exact integral-to-sum relation for products of Bessel functions PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES Philcox, O. H. E., Slepian, Z. 2021; 477 (2253)
  • Kepler's Goat Herd: An exact solution to Kepler's equation for elliptical orbits MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Philcox, O. H. E., Goodman, J., Slepian, Z. 2021; 506 (4): 6111-6116
  • The CAMELS Project: Cosmology and Astrophysics with Machine-learning Simulations ASTROPHYSICAL JOURNAL Villaescusa-Navarro, F., Angles-Alcazar, D., Genel, S., Spergel, D. N., Somerville, R. S., Dave, R., Pillepich, A., Hernquist, L., Nelson, D., Torrey, P., Narayanan, D., Li, Y., Philcox, O., La Torre, V., Delgado, A., Ho, S., Hassan, S., Burkhart, B., Wadekar, D., Battaglia, N., Contardo, G., Bryan, G. L. 2021; 915 (1)
  • Beyond the Yamamoto approximation: Anisotropic power spectra and correlation functions with pairwise lines of sight PHYSICAL REVIEW D Philcox, O. H. E., Slepian, Z. 2021; 103 (12)
  • Cosmology without window functions: Quadratic estimators for the galaxy power spectrum PHYSICAL REVIEW D Philcox, O. H. E. 2021; 103 (10)
  • Modeling galaxies in redshift space at the field level JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS Schmittfull, M., Simonovic, M., Ivanov, M. M., Philcox, O. H. E., Zaldarriaga, M. 2021
  • Modeling the marked spectrum of matter and biased tracers in real- and redshift-space JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS Philcox, O. H. E., Aviles, A., Massara, E. 2021
  • Fewer mocks and less noise: Reducing the dimensionality of cosmological observables with subspace projections PHYSICAL REVIEW D Philcox, O. H. E., Ivanov, M. M., Zaldarriaga, M., Simonovic, M., Schmittfull, M. 2021; 103 (4)
  • Determining the Hubble constant without the sound horizon: Measurements from galaxy surveys PHYSICAL REVIEW D Philcox, O. H. E., Sherwin, B. D., Farren, G. S., Baxter, E. J. 2021; 103 (2)
  • A faster Fourier transform? Computing small-scale power spectra and bispectra for cosmological simulations in <i>O</i>(<i>N</i><SUP>2</SUP>) time MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Philcox, O. H. E. 2021; 501 (3): 4004-4034
  • The clustering of the SDSS-IV extended baryon oscillation spectroscopic survey DR16 luminous red galaxy and emission-line galaxy samples: cosmic distance and structure growth measurements using multiple tracers in configuration space MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Wang, Y., Zhao, G., Zhao, C., Philcox, O. H. E., Alam, S., Tamone, A., de Mattia, A., Ross, A. J., Raichoor, A., Burtin, E., Paviot, R., de la Torre, S., Percival, W. J., Dawson, K. S., Gil-Marin, H., Bautista, J. E., Hou, J., Koyama, K., Peacock, J. A., Ruhlmann-Kleider, V., des Bourboux, H., Chuang, C., Comparat, J., Escoffier, S., Kneib, J., Mueller, E., Newman, J. A., Rossi, G., Shafieloo, A., Schneider, D. P. 2020; 498 (3): 3470–83
  • Nonlinear perturbation theory extension of the Boltzmann code CLASS PHYSICAL REVIEW D Chudaykin, A., Ivanov, M. M., Philcox, O. H. E., Simonovic, M. 2020; 102 (6)
  • What does the marked power spectrum measure? Insights from perturbation theory PHYSICAL REVIEW D Philcox, O. H. E., Massara, E., Spergel, D. N. 2020; 102 (4)
  • Effective halo model: Creating a physical and accurate model of the matter power spectrum and cluster counts PHYSICAL REVIEW D Philcox, O. H. E., Spergel, D. N., Villaescusa-Navarro, F. 2020; 101 (12)
  • Combining full-shape and BAO analyses of galaxy power spectra: a 1.6% CMB-independent constraint on <i>H</i><sub>0</sub> JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS Philcox, O. H. E., Ivanov, M. M., Simonovic, M., Zaldarriaga, M. 2020
  • Computing the small-scale galaxy power spectrum and bispectrum in configuration space MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Philcox, O. H. E., Eisenstein, D. J. 2020; 492 (1): 1214-1242
  • RASCALC: a jackknife approach to estimating single- and multitracer galaxy covariance matrices MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Philcox, O. H. E., Eisenstein, D. J., O'Conne, R., Wiegand, A. 2020; 491 (3): 3290-3317
  • Inferring Galactic Parameters from Chemical Abundances: A Multi-star Approach ASTROPHYSICAL JOURNAL Philcox, O. H. E., Rybizki, J. 2019; 887 (1)
  • Estimating covariance matrices for two- and three-point correlation function moments in Arbitrary Survey Geometries MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Philcox, O. H. E., Eisenstein, D. J. 2019; 490 (4): 5931-5951
  • Detection and removal of B-mode dust foregrounds with signatures of statistical anisotropy MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Philcox, O. H. E., Sherwin, B. D., van Engelen, A. 2018; 479 (4): 5577-5595
  • On the Optimal Choice of Nucleosynthetic Yields, Initial Mass Function, and Number of SNe Ia for Chemical Evolution Modeling ASTROPHYSICAL JOURNAL Philcox, O., Rybizki, J., Gutcke, T. A. 2018; 861 (1)