All Outputs (190)

Cluster gas fraction as a test of gravity (2015)
Journal Article
Li, B., He, J., & Gao, L. (2016). Cluster gas fraction as a test of gravity. Monthly Notices of the Royal Astronomical Society, 456(1), 146-155. https://doi.org/10.1093/mnras/stv2650

We propose a new cosmological test of gravity, by using the observed mass fraction of X-ray-emitting gas in massive galaxy clusters. The cluster gas fraction, believed to be a fair sample of the average baryon fraction in the Universe, is a well-unde... Read More about Cluster gas fraction as a test of gravity.

Speeding up N-body simulations of modified gravity: Vainshtein screening models (2015)
Journal Article
Barreira, A., Bose, S., & Li, B. (2015). Speeding up N-body simulations of modified gravity: Vainshtein screening models. Journal of Cosmology and Astroparticle Physics, 2015(12), Article 059. https://doi.org/10.1088/1475-7516/2015/12/059

We introduce and demonstrate the power of a method to speed up current iterative techniques for N-body modified gravity simulations. Our method is based on the observation that the accuracy of the final result is not compromised if the calculation of... Read More about Speeding up N-body simulations of modified gravity: Vainshtein screening models.

Effective dark matter power spectra in f(R) gravity (2015)
Journal Article
He, J., Li, B., & Hawken, A. (2015). Effective dark matter power spectra in f(R) gravity. Physical Review D, 92(10), Article 103508. https://doi.org/10.1103/physrevd.92.103508

Using N-body simulations, we measure the power spectrum of the effective dark matter density field, which is defined through the modified Poisson equation in f(R) cosmologies. We find that, when compared to the conventional dark matter power spectrum... Read More about Effective dark matter power spectra in f(R) gravity.

The Copernicus Complexio: Statistical Properties of Warm Dark Matter Haloes (2015)
Journal Article
Bose, S., Hellwing, W., Frenk, C., Jenkins, A., Lovell, M., Helly, J., & Li, B. (2016). The Copernicus Complexio: Statistical Properties of Warm Dark Matter Haloes. Monthly Notices of the Royal Astronomical Society, 455(1), 318-333. https://doi.org/10.1093/mnras/stv2294

The recent detection of a 3.5 keV X-ray line from the centres of galaxies and clusters by Bulbul et al. and Boyarsky et al. has been interpreted as emission from the decay of 7 keV sterile neutrinos which could make up the (warm) dark matter (WDM). A... Read More about The Copernicus Complexio: Statistical Properties of Warm Dark Matter Haloes.

Rapid simulation rescaling from standard to modified gravity models (2015)
Journal Article
Mead, A., Peacock, J., Lombriser, L., & Li, B. (2015). Rapid simulation rescaling from standard to modified gravity models. Monthly Notices of the Royal Astronomical Society, 452(4), 4203-4221. https://doi.org/10.1093/mnras/stv1484

We develop and test an algorithm to rescale a simulated dark-matter particle distribution or halo catalogue from a standard gravity model to that of a modified gravity model. This method is based on that of Angulo & White but with some additional ing... Read More about Rapid simulation rescaling from standard to modified gravity models.

Exploring the liminality: properties of haloes and subhaloes in borderline f(R) gravity (2015)
Journal Article
Shi, D., Li, B., Han, J., Gao, L., & Hellwing, W. (2015). Exploring the liminality: properties of haloes and subhaloes in borderline f(R) gravity. Monthly Notices of the Royal Astronomical Society, 452(3), 3179-3191. https://doi.org/10.1093/mnras/stv1549

We investigate the properties of dark matter haloes and subhaloes in an f(R) gravity model with |fR0| = 10−6, using a very-high-resolution N-body simulation. The model is a borderline between being cosmologically interesting and yet still consistent... Read More about Exploring the liminality: properties of haloes and subhaloes in borderline f(R) gravity.

Distinguishing GR and f(R) gravity with the gravitational lensing Minkowski functionals (2015)
Journal Article
Ling, C., Wang, Q., Li, R., Li, B., Wang, J., & Gao, L. (2015). Distinguishing GR and f(R) gravity with the gravitational lensing Minkowski functionals. Physical Review D, 92(6), Article 064024. https://doi.org/10.1103/physrevd.92.064024

We explore the Minkowski functionals (MFs) of weak lensing convergence map to distinguish between f(R) gravity and the general relativity (GR). The mock weak lensing convergence maps are constructed with a set of high-resolution simulations assuming... Read More about Distinguishing GR and f(R) gravity with the gravitational lensing Minkowski functionals.

Using cosmic voids to distinguish f(R) gravity in future galaxy surveys (2015)
Journal Article
Zivick, P., Sutter, P., Wandelt, B., Li, B., & Lam, T. (2015). Using cosmic voids to distinguish f(R) gravity in future galaxy surveys. Monthly Notices of the Royal Astronomical Society, 451(4), 4215-4222. https://doi.org/10.1093/mnras/stv1209

We use properties of void populations identified in N-body simulations to forecast the ability of upcoming galaxy surveys to differentiate models of f (R) gravity from cold dark matter cosmology. We analyse multiple simulation realizations, which wer... Read More about Using cosmic voids to distinguish f(R) gravity in future galaxy surveys.

Effective dark matter halo catalog in f(R) gravity (2015)
Journal Article
He, J., Hawken, A., Li, B., & Guzzo, L. (2015). Effective dark matter halo catalog in f(R) gravity. Physical Review Letters, 115(7), https://doi.org/10.1103/physrevlett.115.071306

We introduce the idea of an effective dark matter halo catalog in f(R) gravity, which is built using the effective density field. Using a suite of high resolution N-body simulations, we find that the dynamical properties of halos, such as the distrib... Read More about Effective dark matter halo catalog in f(R) gravity.

Weak lensing by voids in modified lensing potentials (2015)
Journal Article
Barreira, A., Cautun, M., Li, B., Baugh, C., & Pascoli, S. (2015). Weak lensing by voids in modified lensing potentials. Journal of Cosmology and Astroparticle Physics, 2015(08), https://doi.org/10.1088/1475-7516/2015/08/028

We study lensing by voids in Cubic Galileon and Nonlocal gravity cosmologies, which are examples of theories of gravity that modify the lensing potential. We find voids in the dark matter and halo density fields of N-body simulations and compute thei... Read More about Weak lensing by voids in modified lensing potentials.

f(R) gravity on non-linear scales: The post-Friedmann expansion and the vector potential (2015)
Journal Article
Thomas, D., Bruni, M., Koyama, K., Li, B., & Zhao, G. (2015). f(R) gravity on non-linear scales: The post-Friedmann expansion and the vector potential. Journal of Cosmology and Astroparticle Physics, 2015(07), https://doi.org/10.1088/1475-7516/2015/07/051

Many modified gravity theories are under consideration in cosmology as the source of the accelerated expansion of the universe and linear perturbation theory, valid on the largest scales, has been examined in many of these models. However, smaller no... Read More about f(R) gravity on non-linear scales: The post-Friedmann expansion and the vector potential.

Voids in Modified Gravity Reloaded: Eulerian Void Assignment (2015)
Journal Article
Lam, T., Clampitt, J., Cai, Y., & Li, B. (2015). Voids in Modified Gravity Reloaded: Eulerian Void Assignment. Monthly Notices of the Royal Astronomical Society, 450(3), 3319-3330. https://doi.org/10.1093/mnras/stv797

We revisit the excursion set approach to calculate void abundances in chameleon-type modified gravity theories, which was previously studied by Clampitt, Cai & Li. We focus on properly accounting for the void-in-cloud effect, i.e. the growth of those... Read More about Voids in Modified Gravity Reloaded: Eulerian Void Assignment.

K-mouflage gravity models that pass Solar System and cosmological constraints (2015)
Journal Article
Barreira, A., Brax, P., Cless, S., Li, B., & Valageas, P. (2015). K-mouflage gravity models that pass Solar System and cosmological constraints. Physical Review D, 91(12), Article 123522. https://doi.org/10.1103/physrevd.91.123522

We show that Solar System tests can place very strong constraints on K-mouflage models of gravity, which are coupled scalar field models with nontrivial kinetic terms that screen the fifth force in regions of large gravitational acceleration. In part... Read More about K-mouflage gravity models that pass Solar System and cosmological constraints.

Testing gravity using cosmic voids (2015)
Journal Article
Cai, Y., Padilla, N., & Li, B. (2015). Testing gravity using cosmic voids. Monthly Notices of the Royal Astronomical Society, 451(1), 1036-1055. https://doi.org/10.1093/mnras/stv777

We explore voids in dark matter and halo fields from simulations of Λ cold dark matter and Hu–Sawicki f (R) models. In f (R) gravity, dark matter void abundances are greater than that of general relativity (GR). Differences for halo void abundances a... Read More about Testing gravity using cosmic voids.

Linear perturbations in K-mouflage cosmologies with massive neutrinos (2015)
Journal Article
Barreira, A., Brax, P., Clesse, S., Li, B., & Valageas, P. (2015). Linear perturbations in K-mouflage cosmologies with massive neutrinos. Physical Review D, 91(6), Article 063528. https://doi.org/10.1103/physrevd.91.063528

We present a comprehensive derivation of linear perturbation equations for different matter species, including photons, baryons, cold dark matter, scalar fields, and massless and massive neutrinos in the presence of a generic conformal coupling. Star... Read More about Linear perturbations in K-mouflage cosmologies with massive neutrinos.

Chameleon f(R) gravity on the Virgo cluster scale (2015)
Journal Article
Corbett Moran, C., Teyssier, R., & Li, B. (2015). Chameleon f(R) gravity on the Virgo cluster scale. Monthly Notices of the Royal Astronomical Society, 448(1), 307-327. https://doi.org/10.1093/mnras/stu2757

Models of modified gravity offer promising alternatives to the concordance Λ cold dark matter (ΛCDM) cosmology to explain the late-time acceleration of the universe. A popular such model is f(R) gravity, in which the Ricci scalar in the Einstein–Hilb... Read More about Chameleon f(R) gravity on the Virgo cluster scale.

Testing the quasi-static approximation in f(R) gravity simulations (2015)
Journal Article
Bose, S., Hellwing, W., & Li, B. (2015). Testing the quasi-static approximation in f(R) gravity simulations. Journal of Cosmology and Astroparticle Physics, 2015(02), https://doi.org/10.1088/1475-7516/2015/02/034

Numerical simulations in modified gravity have commonly been performed under the quasi-static approximation—that is, by neglecting the effect of time derivatives in the equation of motion of the scalar field that governs the fifth force in a given mo... Read More about Testing the quasi-static approximation in f(R) gravity simulations.

Galaxy infall kinematics as a test of modified gravity (2014)
Journal Article
Zu, Y., Weinberg, D., Jennings, E., Li, B., & Wyman, M. (2014). Galaxy infall kinematics as a test of modified gravity. Monthly Notices of the Royal Astronomical Society, 445(2), 1885-1897. https://doi.org/10.1093/mnras/stu1739

Infrared modifications of General Relativity (GR) can be revealed by comparing the mass of galaxy clusters estimated from weak lensing to that from infall kinematics. We measure the 2D galaxy velocity distribution in the cluster infall region by appl... Read More about Galaxy infall kinematics as a test of modified gravity.

Revisiting the screening mechanism in f(R) gravity (2014)
Journal Article
He, J., Li, B., Hawken, A., & Granett, B. (2014). Revisiting the screening mechanism in f(R) gravity. Physical Review D, 90, Article 103505. https://doi.org/10.1103/physrevd.90.103505

We reexamine the screening mechanism in f(R) gravity using N-body simulations. By explicitly examining the relation between the extrascalar field δfR and the gravitational potential ϕ in the perturbed Universe, we find that the relation between these... Read More about Revisiting the screening mechanism in f(R) gravity.

Nonlinear structure formation in Nonlocal Gravity (2014)
Journal Article
Barreira, A., Li, B., Hellwing, W., Baugh, C., & Pascoli, S. (2014). Nonlinear structure formation in Nonlocal Gravity. Journal of Cosmology and Astroparticle Physics, 2014(09), Article 031. https://doi.org/10.1088/1475-7516/2014/09/031

We study the nonlinear growth of structure in nonlocal gravity models with the aid of N-body simulation and the spherical collapse and halo models. We focus on a model in which the inverse-squared of the d'Alembertian operator acts on the Ricci scala... Read More about Nonlinear structure formation in Nonlocal Gravity.