All Outputs (190)

Numerical solutions to Einstein’s equations in a shearing-dust universe: a code comparison (2020)
Journal Article
Adamek, J., Barrera-Hinojosa, C., Bruni, M., Li, B., Macpherson, H. J., & Mertens, J. B. (2020). Numerical solutions to Einstein’s equations in a shearing-dust universe: a code comparison. Classical and Quantum Gravity, 37(15), Article 154001. https://doi.org/10.1088/1361-6382/ab939b

A number of codes for general-relativistic simulations of cosmological structure formation have been developed in recent years. Here we demonstrate that a sample of these codes produce consistent results beyond the Newtonian regime. We simulate solut... Read More about Numerical solutions to Einstein’s equations in a shearing-dust universe: a code comparison.

GRAMSES: a new route to general relativistic $N$-body simulations in cosmology. Part II. Initial conditions (2020)
Journal Article
Barrera-Hinojosa, C., & Li, B. (2020). GRAMSES: a new route to general relativistic $N$-body simulations in cosmology. Part II. Initial conditions. Journal of Cosmology and Astroparticle Physics, 2020(4), Article 056. https://doi.org/10.1088/1475-7516/2020/04/056

We address the generation of initial conditions (ICs) for {\sc gramses}, a code for nonlinear general relativistic (GR) N-body cosmological simulations recently introduced in ref. [1]. {\sc gramses} adopts a constant mean curvature slicing with a min... Read More about GRAMSES: a new route to general relativistic $N$-body simulations in cosmology. Part II. Initial conditions.

Measuring the baryon acoustic oscillation peak position with different galaxy selections (2020)
Journal Article
Hernández-Aguayo, C., Cautun, M., Smith, A., Baugh, C. M., & Li, B. (2020). Measuring the baryon acoustic oscillation peak position with different galaxy selections. Monthly Notices of the Royal Astronomical Society, 494(3), 3120-3130. https://doi.org/10.1093/mnras/staa973

We investigate if, for a fixed number density of targets and redshift, there is an optimal way to select a galaxy sample in order to measure the baryon acoustic oscillation (BAO) scale, which is used as a standard ruler to constrain the cosmic expans... Read More about Measuring the baryon acoustic oscillation peak position with different galaxy selections.

Constraining structure formation using EDGES (2020)
Journal Article
Leo, M., Theuns, T., Baugh, C. M., Li, B., & Pascoli, S. (2020). Constraining structure formation using EDGES. Journal of Cosmology and Astroparticle Physics, 2020(4), Article 004. https://doi.org/10.1088/1475-7516/2020/04/004

The experiment to detect the global epoch of reionization signature (EDGES) collaboration reported the detection of a line at 78 MHz in the sky-averaged spectrum due to neutral hydrogen (\ion{H}{i}) 21-cm hyperfine absorption of cosmic microwave back... Read More about Constraining structure formation using EDGES.

Nonlinear structure formation in Bound Dark Energy (2020)
Journal Article
Almaraz, E., Li, B., & de la Macorra, A. (2020). Nonlinear structure formation in Bound Dark Energy. Journal of Cosmology and Astroparticle Physics, 2020, Article 016. https://doi.org/10.1088/1475-7516/2020/03/016

We study nonlinear structure formation in the Bound Dark Energy model (BDE), where dark energy (DE) corresponds to a light scalar meson particle phgr dynamically formed at a condensation energy scale Λc. The evolution of this dark-energy meson is det... Read More about Nonlinear structure formation in Bound Dark Energy.

The accuracy of weak lensing simulations (2020)
Journal Article
Hilbert, S., Barreira, A., Fabbian, G., Fosalba, P., Giocoli, C., Bose, S., …Monaco, P. (2020). The accuracy of weak lensing simulations. Monthly Notices of the Royal Astronomical Society, 493(1), 305-319. https://doi.org/10.1093/mnras/staa281

We investigate the accuracy of weak lensing simulations by comparing the results of five independently developed lensing simulation codes run on the same input N-body simulation. Our comparison focuses on the lensing convergence maps produced by the... Read More about The accuracy of weak lensing simulations.

GRAMSES: a new route to general relativistic N-body simulations in cosmology. Part I. Methodology and code description (2020)
Journal Article
Barrera-Hinojosa, C., & Li, B. (2020). GRAMSES: a new route to general relativistic N-body simulations in cosmology. Part I. Methodology and code description. Journal of Cosmology and Astroparticle Physics, 01, Article 007. https://doi.org/10.1088/1475-7516/2020/01/007

We present GRAMSES, a new pipeline for nonlinear cosmological N-body simulations in General Relativity (GR). This code adopts the Arnowitt-Deser-Misner (ADM) formalism of GR, with constant mean curvature and minimum distortion gauge fixings, which pr... Read More about GRAMSES: a new route to general relativistic N-body simulations in cosmology. Part I. Methodology and code description.

Marked correlation functions in perturbation theory (2020)
Journal Article
Aviles, A., Koyama, K., Cervantes-Cota, J. L., Winther, H. A., & Li, B. (2020). Marked correlation functions in perturbation theory. Journal of Cosmology and Astroparticle Physics, 01, Article 006. https://doi.org/10.1088/1475-7516/2020/01/006

We develop perturbation theory approaches to model the marked correlation function constructed to up-weight low density regions of the Universe, which might help distinguish modified gravity models from the standard cosmology model based on general r... Read More about Marked correlation functions in perturbation theory.

Emulators for the non-linear matter power spectrum beyond ΛCDM (2019)
Journal Article
Winther, H., Casas, S., Baldi, M., Koyama, K., Li, B., Lombriser, L., & Zhao, G. (2019). Emulators for the non-linear matter power spectrum beyond ΛCDM. Physical Review D, 100, https://doi.org/10.1103/physrevd.100.123540

Accurate predictions for the nonlinear matter power spectrum are needed to confront theory with observations in current and near future weak-lensing and galaxy clustering surveys. We propose a computationally cheap method to create an emulator for mo... Read More about Emulators for the non-linear matter power spectrum beyond ΛCDM.

Cosmological test of gravity using weak lensing voids (2019)
Journal Article
Davies, C. T., Cautun, M., & Li, B. (2019). Cosmological test of gravity using weak lensing voids. Monthly Notices of the Royal Astronomical Society, 490(4), 4907-4917. https://doi.org/10.1093/mnras/stz2933

Modifications to general relativity often incorporate screening mechanisms in order to remain compatible with existing tests of gravity. The screening is less efficient in underdense regions, which suggests that cosmic voids can be a useful cosmologi... Read More about Cosmological test of gravity using weak lensing voids.

Simulating galaxy formation in f(R) modified gravity: Matter, halo, and galaxy-statistics (2019)
Journal Article
Arnold, C., & Li, B. (2019). Simulating galaxy formation in f(R) modified gravity: Matter, halo, and galaxy-statistics. Monthly Notices of the Royal Astronomical Society, 490(2), 2507-2520. https://doi.org/10.1093/mnras/stz2690

We present an analysis of the matter, halo and galaxy clustering in f(R)-gravity employing the SHYBONE full-physics hydrodynamical simulation suite. Our analysis focuses on the interplay between baryonic feedback and f(R)-gravity in the matter power... Read More about Simulating galaxy formation in f(R) modified gravity: Matter, halo, and galaxy-statistics.

A high-redshift test of gravity using enhanced growth of small structures probed by the neutral hydrogen distribution (2019)
Journal Article
Leo, M., Arnold, C., & Li, B. (2019). A high-redshift test of gravity using enhanced growth of small structures probed by the neutral hydrogen distribution. Physical Review D, 100(6), Article 064044. https://doi.org/10.1103/physrevd.100.064044

Future 21-cm intensity mapping surveys such as SKA can provide precise information on the spatial distribution of the neutral hydrogen (HI) in the postreionization epoch. This information will allow us to test the standard Λ cold dark matter paradigm... Read More about A high-redshift test of gravity using enhanced growth of small structures probed by the neutral hydrogen distribution.

Screening maps of the local Universe I - Methodology (2019)
Journal Article
Shao, S., Li, B., Cautun, M., Wang, H., & Wang, J. (2019). Screening maps of the local Universe I - Methodology. Monthly Notices of the Royal Astronomical Society, 489(4), 4912-4925. https://doi.org/10.1093/mnras/stz2450

We introduce the LOCal Universe Screening Test Suite (LOCUSTS) project, an effort to create ‘screening maps’ in the nearby Universe to identify regions in our neighbourhood which are screened, i.e., regions where deviations from General Relativity (G... Read More about Screening maps of the local Universe I - Methodology.

Early dark energy constraints on growing neutrino quintessence cosmologies (2019)
Journal Article
Noble Chamings, F., Avgoustidis, A., Copeland, E. J., Green, A. M., & Li, B. (2019). Early dark energy constraints on growing neutrino quintessence cosmologies. Physical Review D, 100(4), Article 043525. https://doi.org/10.1103/physrevd.100.043525

We investigate cosmological models in which dynamical dark energy consists of a scalar field whose present-day value is controlled by a coupling to the neutrino sector. The behavior of the scalar field depends on three functions: a kinetic function,... Read More about Early dark energy constraints on growing neutrino quintessence cosmologies.

The self similarity of weak lensing peaks (2019)
Journal Article
Davies, C. T., Cautun, M., & Li, B. (2019). The self similarity of weak lensing peaks. Monthly Notices of the Royal Astronomical Society, 488(4), 5833-5851. https://doi.org/10.1093/mnras/stz2157

We study the statistics of weak lensing convergence peaks, such as their abundance and two-point correlation function (2PCF), for a wide range of cosmological parameters Ωm and σ8 within the standard ΛCDM paradigm, focusing on intermediate-height pea... Read More about The self similarity of weak lensing peaks.

Observable tests of self-interacting dark matter in galaxy clusters: cosmological simulations with SIDM and baryons (2019)
Journal Article
Robertson, A., Harvey, D., Massey, R., Eke, V., McCarthy, I. G., Jauzac, M., …Schaye, J. (2019). Observable tests of self-interacting dark matter in galaxy clusters: cosmological simulations with SIDM and baryons. Monthly Notices of the Royal Astronomical Society, 488(3), 3646-3662. https://doi.org/10.1093/mnras/stz1815

We present BAHAMAS-SIDM, the first large-volume, (400 h−1 Mpc)3, cosmological simulations including both self-interacting dark matter (SIDM) and baryonic physics. These simulations are important for two primary reasons: 1) they include the effects of... Read More about Observable tests of self-interacting dark matter in galaxy clusters: cosmological simulations with SIDM and baryons.

Realistic simulations of galaxy formation in f(R) modified gravity (2019)
Journal Article
Arnold, C., Leo, M., & Li, B. (2019). Realistic simulations of galaxy formation in f(R) modified gravity. Nature Astronomy, 3(10), 945-954. https://doi.org/10.1038/s41550-019-0823-y

Future astronomical surveys will gather information that will allow gravity to be tested on cosmological scales, where general relativity is currently poorly constrained. We present a set of cosmological hydrodynamical simulations that follow galaxy... Read More about Realistic simulations of galaxy formation in f(R) modified gravity.

On the road to percent accuracy: nonlinear reaction of the matter power spectrum to dark energy and modified gravity (2019)
Journal Article
Cataneo, M., Lombriser, L., Heymans, C., Mead, A., Barreira, A., Bose, S., & Li, B. (2019). On the road to percent accuracy: nonlinear reaction of the matter power spectrum to dark energy and modified gravity. Monthly Notices of the Royal Astronomical Society, 488(2), 2121-2142. https://doi.org/10.1093/mnras/stz1836

We present a general method to compute the nonlinear matter power spectrum for dark energy and modified gravity scenarios with percent-level accuracy. By adopting the halo model and nonlinear perturbation theory, we predict the reaction of a ΛCDM mat... Read More about On the road to percent accuracy: nonlinear reaction of the matter power spectrum to dark energy and modified gravity.

The Galaxy Halo Connection in Modified Gravity Cosmologies: Environment Dependence of Galaxy Luminosity function (2019)
Journal Article
Devi, N. C., Rodríguez-Puebla, A., Valenzuela, O., Avila-Reese, V., Hernández-Aguayo, C., & Li, B. (2019). The Galaxy Halo Connection in Modified Gravity Cosmologies: Environment Dependence of Galaxy Luminosity function. Monthly Notices of the Royal Astronomical Society, 488(1), 782-802. https://doi.org/10.1093/mnras/stz1664

We investigate the dependence of the galaxy–halo connection and galaxy density field in modified gravity models using the N-body simulations for f(R) and nDGP models at z = 0. Because of the screening mechanisms employed by these models, chameleon an... Read More about The Galaxy Halo Connection in Modified Gravity Cosmologies: Environment Dependence of Galaxy Luminosity function.

A general framework to test gravity using galaxy clusters II: A universal model for the halo concentration in f(R) gravity (2019)
Journal Article
Mitchell, M. A., Arnold, C., He, J., & Li, B. (2019). A general framework to test gravity using galaxy clusters II: A universal model for the halo concentration in f(R) gravity. Monthly Notices of the Royal Astronomical Society, 487(1), 1410-1425. https://doi.org/10.1093/mnras/stz1389

We present a novel fitting formula for the halo concentration enhancement in chameleon f(R) gravity relative to General Relativity (GR). The formula is derived by employing a large set of N-body simulations of the Hu-Sawicki f(R) model which cover a... Read More about A general framework to test gravity using galaxy clusters II: A universal model for the halo concentration in f(R) gravity.