All Outputs (190)

Equivalence of cosmological observables in conformally related scalar tensor theories (2017)
Journal Article
Rondeau, F., & Li, B. (2017). Equivalence of cosmological observables in conformally related scalar tensor theories. Physical Review D, 96(12), Article 124009. https://doi.org/10.1103/physrevd.96.124009

Scalar tensor theories can be expressed in different frames, such as the commonly used Einstein and Jordan frames, and it is generally accepted that cosmological observables are the same in these frames. We revisit this by making a detailed side-by-s... Read More about Equivalence of cosmological observables in conformally related scalar tensor theories.

Galaxy–galaxy weak gravitational lensing in f(R) gravity (2017)
Journal Article
Li, B., & Shirasaki, M. (2018). Galaxy–galaxy weak gravitational lensing in f(R) gravity. Monthly Notices of the Royal Astronomical Society, 474(3), 3599-3614. https://doi.org/10.1093/mnras/stx3006

We present an analysis of galaxy–galaxy weak gravitational lensing (GGL) in chameleon f(R) gravity – a leading candidate of non-standard gravity models. For the analysis, we have created mock galaxy catalogues based on dark matter haloes from two set... Read More about Galaxy–galaxy weak gravitational lensing in f(R) gravity.

The effect of thermal velocities on structure formation in N-body simulations of warm dark matter (2017)
Journal Article
Leo, M., Baugh, C., Li, B., & Pascoli, S. (2017). The effect of thermal velocities on structure formation in N-body simulations of warm dark matter. Journal of Cosmology and Astroparticle Physics, 2017(11), Article 017. https://doi.org/10.1088/1475-7516/2017/11/017

We investigate the impact of thermal velocities in N-body simulations of structure formation in warm dark matter models. Adopting the commonly used approach of adding thermal velocities, randomly selected from a Fermi-Dirac distribution, to the gravi... Read More about The effect of thermal velocities on structure formation in N-body simulations of warm dark matter.

The Effect of Modified Gravity on the Odds of the Bound Violations of the Turn-around Radii (2017)
Journal Article
Lee, J., & Li, B. (2017). The Effect of Modified Gravity on the Odds of the Bound Violations of the Turn-around Radii. Astrophysical Journal, 842(1), Article 2. https://doi.org/10.3847/1538-4357/aa706f

The turn-around radii of the galaxy groups show the imprint of a long battle between their self-gravitational forces and the accelerating space. The standard ΛCDM cosmology based on the general relativity (GR) predicts the existence of an upper bound... Read More about The Effect of Modified Gravity on the Odds of the Bound Violations of the Turn-around Radii.

New Probe of Departures from General Relativity Using Minkowski Functionals (2017)
Journal Article
Fang, W., Li, B., & Zhao, G. (2017). New Probe of Departures from General Relativity Using Minkowski Functionals. Physical Review Letters, 118(18), Article 181301. https://doi.org/10.1103/physrevlett.118.181301

The morphological properties of the large scale structure of the Universe can be fully described by four Minkowski functionals (MFs), which provide important complementary information to other statistical observables such as the widely used 2-point s... Read More about New Probe of Departures from General Relativity Using Minkowski Functionals.

Environmental screening of dark matter haloes in f(R) gravity (2017)
Journal Article
Shi, D., Li, B., & Han, J. (2017). Environmental screening of dark matter haloes in f(R) gravity. Monthly Notices of the Royal Astronomical Society, 469(1), 705-715. https://doi.org/10.1093/mnras/stx865

In certain theories of modified gravity, solar system constraints on deviations from general relativity (GR) are satisfied by virtue of a so-called screening mechanism, which enables the theory to revert to GR in regions where the matter density is h... Read More about Environmental screening of dark matter haloes in f(R) gravity.

Speeding up N-body simulations of modified gravity: Chameleon screening models (2017)
Journal Article
Bose, S., Li, B., Barreira, A., He, J., Hellwing, W. A., Koyama, K., …Zhao, G. (2017). Speeding up N-body simulations of modified gravity: Chameleon screening models. Journal of Cosmology and Astroparticle Physics, 2017(02), Article 050. https://doi.org/10.1088/1475-7516/2017/02/050

We describe and demonstrate the potential of a new and very efficient method for simulating certain classes of modified gravity theories, such as the widely studied f(R) gravity models. High resolution simulations for such models are currently very s... Read More about Speeding up N-body simulations of modified gravity: Chameleon screening models.

Weak lensing by galaxy troughs with modified gravity (2017)
Journal Article
Barreira, A., Bose, S., Li, B., & Llinares, C. (2017). Weak lensing by galaxy troughs with modified gravity. Journal of Cosmology and Astroparticle Physics, 2017(02), Article 031. https://doi.org/10.1088/1475-7516/2017/02/031

We study the imprints that theories of gravity beyond GR can leave on the lensing signal around line of sight directions that are predominantly halo-underdense (called troughs) and halo-overdense. To carry out our investigations, we consider the norm... Read More about Weak lensing by galaxy troughs with modified gravity.

The imprint of f(R) gravity on weak gravitational lensing II: Information content in cosmic shear statistics (2016)
Journal Article
Shirasaki, M., Nishimichi, T., Li, B., & Higuchi, Y. (2017). The imprint of f(R) gravity on weak gravitational lensing II: Information content in cosmic shear statistics. Monthly Notices of the Royal Astronomical Society, 466(2), 2402-2417. https://doi.org/10.1093/mnras/stw3254

We investigate the information content of various cosmic shear statistics on the theory of gravity. Focusing on the Hu–Sawicki-type f(R) model, we perform a set of ray-tracing simulations and measure the convergence bispectrum, peak counts and Minkow... Read More about The imprint of f(R) gravity on weak gravitational lensing II: Information content in cosmic shear statistics.

Cluster abundance in chameleon f(R) gravity I: toward an accurate halo mass function prediction (2016)
Journal Article
Cataneo, M., Rapetti, D., Lombriser, L., & Li, B. (2016). Cluster abundance in chameleon f(R) gravity I: toward an accurate halo mass function prediction. Journal of Cosmology and Astroparticle Physics, 2016(12), Article 024. https://doi.org/10.1088/1475-7516/2016/12/024

We refine the mass and environment dependent spherical collapse model of chameleon f(R) gravity by calibrating a phenomenological correction inspired by the parameterized post-Friedmann framework against high-resolution N-body simulations. We employ... Read More about Cluster abundance in chameleon f(R) gravity I: toward an accurate halo mass function prediction.

Subhalo abundance matching in f(R) gravity (2016)
Journal Article
He, J., Li, B., & Baugh, C. M. (2016). Subhalo abundance matching in f(R) gravity. Physical Review Letters, 117(22), Article 221101. https://doi.org/10.1103/physrevlett.117.221101

Using the liminality N-body simulations of Shi et al., we present the first predictions for galaxy clustering in f(R) gravity using subhalo abundance matching. We find that, for a given galaxy density, even for an f(R) model with fR0=−10−6, for which... Read More about Subhalo abundance matching in f(R) gravity.

Substructure and galaxy formation in the Copernicus Complexio warm dark matter simulations (2016)
Journal Article
Bose, S., Hellwing, W., Frenk, C., Jenkins, A., Lovell, M., Helly, J., …Gao, L. (2017). Substructure and galaxy formation in the Copernicus Complexio warm dark matter simulations. Monthly Notices of the Royal Astronomical Society, 464(4), 4520-4533. https://doi.org/10.1093/mnras/stw2686

We use the Copernicus Complexio (coco) high-resolution N-body simulations to investigate differences in the properties of small-scale structures in the standard cold dark matter (CDM) model and in a model with a cutoff in the initial power spectrum o... Read More about Substructure and galaxy formation in the Copernicus Complexio warm dark matter simulations.

Can background cosmology hold the key for modified gravity tests? (2016)
Journal Article
Ceron-Hurtado, J., He, J., & Li, B. (2016). Can background cosmology hold the key for modified gravity tests?. Physical Review D, 94(6), Article 064052. https://doi.org/10.1103/physrevd.94.064052

Modified gravity theories are a popular alternative to dark energy as a possible explanation for the observed accelerating cosmic expansion, and their cosmological tests are currently an active research field. Studies in recent years have been increa... Read More about Can background cosmology hold the key for modified gravity tests?.

Constraining f(R) Gravity Theory Using Weak Lensing Peak Statistics from the Canada-France-Hawaii-Telescope Lensing Survey (2016)
Journal Article
Liu, X., Li, B., Zhao, G., Chiu, M., Fang, W., Pan, C., …Fan, Z. (2016). Constraining f(R) Gravity Theory Using Weak Lensing Peak Statistics from the Canada-France-Hawaii-Telescope Lensing Survey. Physical Review Letters, 117(5), Article 051101. https://doi.org/10.1103/physrevlett.117.051101

In this Letter, we report the observational constraints on the Hu-Sawicki f(R) theory derived from weak lensing peak abundances, which are closely related to the mass function of massive halos. In comparison with studies using optical or x-ray cluste... Read More about Constraining f(R) Gravity Theory Using Weak Lensing Peak Statistics from the Canada-France-Hawaii-Telescope Lensing Survey.

Accurate method of modeling cluster scaling relations in modified gravity (2016)
Journal Article
J.-h, H., & Li, B. (2016). Accurate method of modeling cluster scaling relations in modified gravity. Physical Review D, 93(12), Article 123512. https://doi.org/10.1103/physrevd.93.123512

We propose a new method to model cluster scaling relations in modified gravity. Using a suite of nonradiative hydrodynamical simulations, we show that the scaling relations of accumulated gas quantities, such as the Sunyaev-Zel’dovich effect (Compton... Read More about Accurate method of modeling cluster scaling relations in modified gravity.

RAY-RAMSES: a code for ray tracing on the fly in N-body simulations (2016)
Journal Article
Barreira, A., Llinares, C., Bose, S., & Li, B. (2016). RAY-RAMSES: a code for ray tracing on the fly in N-body simulations. Journal of Cosmology and Astroparticle Physics, 2016(05), Article 001. https://doi.org/10.1088/1475-7516/2016/05/001

We present a ray tracing code to compute integrated cosmological observables on the fly in AMR N-body simulations. Unlike conventional ray tracing techniques, our code takes full advantage of the time and spatial resolution attained by the N-body sim... Read More about RAY-RAMSES: a code for ray tracing on the fly in N-body simulations.

Probing theories of gravity with phase space-inferred potentials of galaxy clusters (2016)
Journal Article
Stark, A., Miller, C., Kern, N., Gifford, D., Zhao, G., Li, B., …Nichol, R. (2016). Probing theories of gravity with phase space-inferred potentials of galaxy clusters. Physical Review D, 93(8), Article 084036. https://doi.org/10.1103/physrevd.93.084036

Modified theories of gravity provide us with a unique opportunity to generate innovative tests of gravity. In Chameleon f(R) gravity, the gravitational potential differs from the weak-field limit of general relativity (GR) in a mass dependent way. We... Read More about Probing theories of gravity with phase space-inferred potentials of galaxy clusters.

The Distribution of Dark and Luminous Matter in the Unique Galaxy Cluster Merger Abell 2146 (2016)
Journal Article
King, L., Clowe, D., Coleman, J., Russell, H., Santana, R., White, J., …McNamara, B. (2016). The Distribution of Dark and Luminous Matter in the Unique Galaxy Cluster Merger Abell 2146. Monthly Notices of the Royal Astronomical Society, 459(1), 517-527. https://doi.org/10.1093/mnras/stw507

Abell 2146 (z = 0.232) consists of two galaxy clusters undergoing a major merger. The system was discovered in previous work, where two large shock fronts were detected using the Chandra X-ray Observatory, consistent with a merger close to the plane... Read More about The Distribution of Dark and Luminous Matter in the Unique Galaxy Cluster Merger Abell 2146.

Galaxy cluster lensing masses in modified lensing potentials (2015)
Journal Article
Barreira, A., Li, B., Jennings, E., Merten, J., King, L., Baugh, C., & Pascoli, S. (2015). Galaxy cluster lensing masses in modified lensing potentials. Monthly Notices of the Royal Astronomical Society, 454(4), 4085-4102. https://doi.org/10.1093/mnras/stv2211

We determine the concentration–mass relation of 19 X-ray selected galaxy clusters from the Cluster Lensing and Supernova Survey with Hubble survey in theories of gravity that directly modify the lensing potential. We model the clusters as Navarro–Fre... Read More about Galaxy cluster lensing masses in modified lensing potentials.

Modified gravity N-body code comparison project (2015)
Journal Article
Winther, H., Schmidt, F., Barreira, A., Arnold, C., Bose, S., Llinares, C., …Zhao, G. (2015). Modified gravity N-body code comparison project. Monthly Notices of the Royal Astronomical Society, 454(4), 4208-4234. https://doi.org/10.1093/mnras/stv2253

Self-consistent N-body simulations of modified gravity models are a key ingredient to obtain rigorous constraints on deviations from general relativity using large-scale structure observations. This paper provides the first detailed comparison of the... Read More about Modified gravity N-body code comparison project.