Outputs (16)

N-body simulations of structure formation in thermal inflation cosmologies (2018)
Journal Article
Leo, M., Baugh, C. M., Li, B., & Pascoli, S. (2018). N-body simulations of structure formation in thermal inflation cosmologies. Journal of Cosmology and Astroparticle Physics, 2018(12), Article 010. https://doi.org/10.1088/1475-7516/2018/12/010

Thermal inflation models (which feature two inflationary stages) can display damped primordial curvature power spectra on small scales which generate damped matter fluctuations. For a reasonable choice of parameters, thermal inflation models naturall... Read More about N-body simulations of structure formation in thermal inflation cosmologies.

Splashback in galaxy clusters as a probe of cosmic expansion and gravity (2018)
Journal Article
Adhikari, S., Sakstein, J., Jain, B., Dalal, N., & Li, B. (2018). Splashback in galaxy clusters as a probe of cosmic expansion and gravity. Journal of Cosmology and Astroparticle Physics, 2018(11), Article 033. https://doi.org/10.1088/1475-7516/2018/11/033

The splashback radius is a physical scale in dark matter halos that is set by the gravitational dynamics of recently accreted shells. We use analytical models and N-body simulations to study the dependence of splashback on dark energy and screened mo... Read More about Splashback in galaxy clusters as a probe of cosmic expansion and gravity.

Constraining the time variation of Newton's constant G with gravitational-wave standard sirens and supernovae (2018)
Journal Article
Zhao, W., Wright, B. S., & Li, B. (2018). Constraining the time variation of Newton's constant G with gravitational-wave standard sirens and supernovae. Journal of Cosmology and Astroparticle Physics, 2018(10), Article 052. https://doi.org/10.1088/1475-7516/2018/10/052

The intrinsic peak luminosity of Type Ia supernovae (SNIa) depends on the value of Newton's gravitational constant G, through the Chandrasekhar mass MCh∝ G−3/2. If the luminosity distance can be independently determined, the SNIa can be treated as a... Read More about Constraining the time variation of Newton's constant G with gravitational-wave standard sirens and supernovae.

No evidence for modifications of gravity from galaxy motions on cosmological scales (2018)
Journal Article
He, J., Guzzo, L., Li, B., & Baugh, C. M. (2018). No evidence for modifications of gravity from galaxy motions on cosmological scales. Nature Astronomy, 2(12), 967-972. https://doi.org/10.1038/s41550-018-0573-2

Current tests of general relativity (GR) remain confined to the scale of stellar systems or the strong gravity regime. A departure from GR on cosmological scales has been advocated1 as an alternative to the cosmological constant Λ (ref. 2) to account... Read More about No evidence for modifications of gravity from galaxy motions on cosmological scales.

Approximation methods in modified gravity models (2018)
Journal Article
Li, B. (2018). Approximation methods in modified gravity models. International Journal of Modern Physics D, 27(15), Article 1848004. https://doi.org/10.1142/s0218271818480048

We review some of the commonly used approximation methods to predict large-scale structure formation in modified gravity (MG) models for the cosmic acceleration. These methods are developed to speed up the often slow N-body simulations in these model... Read More about Approximation methods in modified gravity models.

Nonlinear growth of structure in cosmologies with damped matter fluctuations (2018)
Journal Article
Leo, M., Baugh, C., Li, B., & Pascoli, S. (2018). Nonlinear growth of structure in cosmologies with damped matter fluctuations. Journal of Cosmology and Astroparticle Physics, 2018(08), Article 001. https://doi.org/10.1088/1475-7516/2018/08/001

We investigate the nonlinear evolution of structure in variants of the standard cosmological model which display damped density fluctuations relative to cold dark matter (e.g. in which cold dark matter is replaced by warm or interacting DM). Using N-... Read More about Nonlinear growth of structure in cosmologies with damped matter fluctuations.

Weak lensing by voids in weak lensing maps (2018)
Journal Article
Davies, C. T., Cautun, M., & Li, B. (2018). Weak lensing by voids in weak lensing maps. Monthly Notices of the Royal Astronomical Society: Letters, 480(1), L101-L105. https://doi.org/10.1093/mnrasl/sly135

Cosmic voids are an important probe of large-scale structure that can constrain cosmological parameters and test cosmological models. We present a new paradigm for void studies: void detection in weak lensing convergence maps. This approach identifie... Read More about Weak lensing by voids in weak lensing maps.

Marked clustering statistics in f(R) gravity cosmologies (2018)
Journal Article
Hernández-Aguayo, C., Baugh, C. M., & Li, B. (2018). Marked clustering statistics in f(R) gravity cosmologies. Monthly Notices of the Royal Astronomical Society, 479(1), 4824-4835. https://doi.org/10.1093/mnras/sty1822

We analyse the two-point and marked correlation functions (mCFs) of haloes and galaxies in three variants of the chameleon f(R) gravity model using N-body simulations, and compare to a fiducial Λ cold dark matter model based on general relativity (GR... Read More about Marked clustering statistics in f(R) gravity cosmologies.

Testing modified gravity using a marked correlation function (2018)
Journal Article
Armijo, J., Y.-c., C., Padilla, N., Li, B., & Peacock, J. (2018). Testing modified gravity using a marked correlation function. Monthly Notices of the Royal Astronomical Society, 478(3), 3627-3632. https://doi.org/10.1093/mnras/sty1335

In theories of modified gravity with the chameleon screening mechanism, the strength of the fifth force depends on environment. This induces an environment dependence of structure formation, which differs from Λ-cold-dark-matter (ΛCDM). We show that... Read More about Testing modified gravity using a marked correlation function.

Type Ia supernovae, standardizable candles, and gravity (2018)
Journal Article
Wright, B. S., & Li, B. (2018). Type Ia supernovae, standardizable candles, and gravity. Physical Review D, 97(8), Article 083505. https://doi.org/10.1103/physrevd.97.083505

Type Ia supernovae (SNe Ia) are generally accepted to act as standardizable candles, and their use in cosmology led to the first confirmation of the as yet unexplained accelerated cosmic expansion. Many of the theoretical models to explain the cosmic... Read More about Type Ia supernovae, standardizable candles, and gravity.