All Outputs (14)

The impact of modified gravity on the Sunyaev–Zeldovich effect (2020)
Journal Article
Mitchell, M. A., Arnold, C., Hernández-Aguayo, C., & Li, B. (2021). The impact of modified gravity on the Sunyaev–Zeldovich effect. Monthly Notices of the Royal Astronomical Society, 501(3), 4565-4578. https://doi.org/10.1093/mnras/staa3941

We study the effects of two popular modified gravity theories, which incorporate very different screening mechanisms, on the angular power spectra of the thermal (tSZ) and kinematic (kSZ) components of the Sunyaev–Zeldovich effect. Using the first co... Read More about The impact of modified gravity on the Sunyaev–Zeldovich effect.

Baryon acoustic oscillations reconstruction using convolutional neural networks (2020)
Journal Article
Mao, T., Wang, J., Li, B., Cai, Y., Falck, B., Neyrinck, M., & Szalay, A. (2021). Baryon acoustic oscillations reconstruction using convolutional neural networks. Monthly Notices of the Royal Astronomical Society, 501(1), 1499-1510. https://doi.org/10.1093/mnras/staa3741

We propose a new scheme to reconstruct the baryon acoustic oscillations (BAO) signal, which contains key cosmological information, based on deep convolutional neural networks (CNN). Trained with almost no fine tuning, the network can recover large-sc... Read More about Baryon acoustic oscillations reconstruction using convolutional neural networks.

Proca-stinated cosmology. Part I. A N-body code for the vector Galileon (2020)
Journal Article
Becker, C., Arnold, C., Li, B., & Heisenberg, L. (2020). Proca-stinated cosmology. Part I. A N-body code for the vector Galileon. Journal of Cosmology and Astroparticle Physics, 2020(10), https://doi.org/10.1088/1475-7516/2020/10/055

We investigate the nonlinear growth of large-scale structure in the generalised Proca theory, in which a self-interacting massive vector field plays the role of driving the acceleration of the cosmic expansion. Focusing to the Proca Lagrangian at cub... Read More about Proca-stinated cosmology. Part I. A N-body code for the vector Galileon.

Optimal void finders in weak lensing maps (2020)
Journal Article
Davies, C. T., Paillas, E., Cautun, M., & Li, B. (2021). Optimal void finders in weak lensing maps. Monthly Notices of the Royal Astronomical Society, 500(2), 2417-2439. https://doi.org/10.1093/mnras/staa3262

Cosmic voids are a key component of the large-scale structure that contain a plethora of cosmological information. Typically, voids are identified from the underlying galaxy distribution, which is a biased tracer of the total matter field. Previous w... Read More about Optimal void finders in weak lensing maps.

Towards a non-Gaussian model of redshift space distortions (2020)
Journal Article
Cuesta-Lazaro, C., Li, B., Eggemeier, A., Zarrouk, P., Baugh, C. M., Nishimichi, T., & Takada, M. (2020). Towards a non-Gaussian model of redshift space distortions. Monthly Notices of the Royal Astronomical Society, 498(1), 1175-1193. https://doi.org/10.1093/mnras/staa2249

To understand the nature of the accelerated expansion of the Universe, we need to combine constraints on the expansion rate and growth of structure. The growth rate is usually extracted from 3D galaxy maps by exploiting the effects of peculiar motion... Read More about Towards a non-Gaussian model of redshift space distortions.

Iterative removal of redshift space distortions from galaxy clustering (2020)
Journal Article
Wang, Y., Li, B., & Cautun, M. (2020). Iterative removal of redshift space distortions from galaxy clustering. Monthly Notices of the Royal Astronomical Society, 497(3), 3451-3471. https://doi.org/10.1093/mnras/staa2136

Observations of galaxy clustering are made in redshift space, which results in distortions to the underlying isotropic distribution of galaxies. These redshift-space distortions (RSD) not only degrade important features of the matter density field, s... Read More about Iterative removal of redshift space distortions from galaxy clustering.

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.

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.

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.