All Outputs (8)

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.