All Outputs (190)

The observational status of Galileon gravity after Planck (2014)
Journal Article
Barreira, A., Li, B., Baugh, C., & Pascoli, S. (2014). The observational status of Galileon gravity after Planck. Journal of Cosmology and Astroparticle Physics, 2014(08), Article 059. https://doi.org/10.1088/1475-7516/2014/08/059

We use the latest CMB data from Planck, together with BAO measurements, to constrain the full parameter space of Galileon gravity. We constrain separately the three main branches of the theory known as the Cubic, Quartic and Quintic models, and find... Read More about The observational status of Galileon gravity after Planck.

The Vainshtein mechanism in the cosmic web (2014)
Journal Article
Falck, B., Koyama, K., Zhao, G., & Li, B. (2014). The Vainshtein mechanism in the cosmic web. Journal of Cosmology and Astroparticle Physics, 2014(07), Article 058. https://doi.org/10.1088/1475-7516/2014/07/058

We investigate the dependence of the Vainshtein screening mechanism on the cosmic web morphology of both dark matter particles and halos as determined by ORIGAMI. Unlike chameleon and symmetron screening, which come into effect in regions of high den... Read More about The Vainshtein mechanism in the cosmic web.

Modified gravity with massive neutrinos as a testable alternative cosmological model (2014)
Journal Article
Barreira, A., Li, B., Baugh, C., & Pascoli, S. (2014). Modified gravity with massive neutrinos as a testable alternative cosmological model. Physical Review D, 90(2), Article 023528. https://doi.org/10.1103/physrevd.90.023528

We show that, in the presence of massive neutrinos, the Galileon gravity model provides a very good fit to the current cosmic microwave background (CMB) temperature, CMB lensing and baryonic acoustic oscillation data. This model, which we dub νGalile... Read More about Modified gravity with massive neutrinos as a testable alternative cosmological model.

Clear and measurable signature of modified gravity in the galaxy velocity field (2014)
Journal Article
Hellwing, W., Barreira, A., Frenk, C., Li, B., & Cole, S. (2014). Clear and measurable signature of modified gravity in the galaxy velocity field. Physical Review Letters, 112(22), Article 221102. https://doi.org/10.1103/physrevlett.112.221102

The velocity field of dark matter and galaxies reflects the continued action of gravity throughout cosmic history. We show that the low-order moments of the pairwise velocity distribution, v 12 , are a powerful diagnostic of the laws of gravity on co... Read More about Clear and measurable signature of modified gravity in the galaxy velocity field.

Mechanotransduction in the muscle spindle (2014)
Journal Article
Bewick, G. S., & Banks, R. W. (2015). Mechanotransduction in the muscle spindle. Pflügers Archiv European Journal of Physiology, 467(1), 175-190. https://doi.org/10.1007/s00424-014-1536-9

The focus of this review is on the principal sensory ending of the mammalian muscle spindle, known as the primary ending. The process of mechanosensory transduction in the primary ending is examined under five headings: (i) action potential responses... Read More about Mechanotransduction in the muscle spindle.

Halo model and halo properties in Galileon gravity cosmologies (2014)
Journal Article
Barreira, A., Li, B., Hellwing, W., Lombriser, L., Baugh, C., & Pascoli, S. (2014). Halo model and halo properties in Galileon gravity cosmologies. Journal of Cosmology and Astroparticle Physics, 2014(04), Article 029. https://doi.org/10.1088/1475-7516/2014/04/029

We investigate the performance of semi-analytical modelling of large-scale structure in Galileon gravity cosmologies using results from N-body simulations. We focus on the Cubic and Quartic Galileon models that provide a reasonable fit to CMB, SNIa a... Read More about Halo model and halo properties in Galileon gravity cosmologies.

The Integrated Sachs-Wolfe effect in f(R) gravity (2014)
Journal Article
Cai, Y., Li, B., Cole, S., Frenk, C., & Neyrinck, M. (2014). The Integrated Sachs-Wolfe effect in f(R) gravity. Monthly Notices of the Royal Astronomical Society, 439(3), 2978-2989. https://doi.org/10.1093/mnras/stu154

We study the late-time integrated Sachs–Wolfe (ISW) effect in f(R) gravity using N-body simulations. In the f(R) model under study, the linear growth rate is larger than that in general relativity (GR). This slows down the decay of the cosmic potenti... Read More about The Integrated Sachs-Wolfe effect in f(R) gravity.

Massive gravity wrapped in the cosmic web (2014)
Journal Article
Shim, J., Lee, J., & Li, B. (2014). Massive gravity wrapped in the cosmic web. Astrophysical Journal, 784(1), Article 84. https://doi.org/10.1088/0004-637x/784/1/84

We study how the filamentary pattern of the cosmic web changes if the true gravity deviates from general relativity (GR) on a large scale. The f(R) gravity, whose strength is controlled to satisfy the current observational constraints on the cluster... Read More about Massive gravity wrapped in the cosmic web.

Halo modelling in chameleon theories (2014)
Journal Article
Lombriser, L., Koyama, K., & Li, B. (2014). Halo modelling in chameleon theories. Journal of Cosmology and Astroparticle Physics, 2014(03), Article 021. https://doi.org/10.1088/1475-7516/2014/03/021

We analyse modelling techniques for the large-scale structure formed in scalar-tensor theories of constant Brans-Dicke parameter which match the concordance model background expansion history and produce a chameleon suppression of the gravitational m... Read More about Halo modelling in chameleon theories.

Spherical collapse in Galileon gravity: fifth force solutions, halo mass function and halo bias (2013)
Journal Article
Barreira, A., Li, B., Baugh, C., & Pascoli, S. (2013). Spherical collapse in Galileon gravity: fifth force solutions, halo mass function and halo bias. Journal of Cosmology and Astroparticle Physics, 11(2013), Article 056. https://doi.org/10.1088/1475-7516/2013/11/056

We study spherical collapse in the Quartic and Quintic Covariant Galileon gravity models within the framework of the excursion set formalism. We derive the nonlinear spherically symmetric equations in the quasi-static and weak-field limits, focusing... Read More about Spherical collapse in Galileon gravity: fifth force solutions, halo mass function and halo bias.

Revisiting the matter power spectra in f(R) gravity (2013)
Journal Article
He, J., Li, B., & Jing, Y. (2013). Revisiting the matter power spectra in f(R) gravity. Physical Review D, 88(10), Article 103507. https://doi.org/10.1103/physrevd.88.103507

In this paper, we study the nonlinear matter power spectrum in a specific family of f(R) models that can reproduce the ΛCDM background expansion history, using high resolution N-body simulations based on the ecosmog code. We measure the matter power... Read More about Revisiting the matter power spectra in f(R) gravity.

Simulating the quartic Galileon gravity model on adaptively refined meshes (2013)
Journal Article
Li, B., Barreira, A., Baugh, C., Hellwing, W., Koyama, K., Pascoli, S., & Zhao, G. (2013). Simulating the quartic Galileon gravity model on adaptively refined meshes. Journal of Cosmology and Astroparticle Physics, 2013(11), Article 12. https://doi.org/10.1088/1475-7516/2013/11/012

We develop a numerical algorithm to solve the high-order nonlinear derivative-coupling equation associated with the quartic Galileon model, and implement it in a modified version of the ramses N-body code to study the effect of the Galileon field on... Read More about Simulating the quartic Galileon gravity model on adaptively refined meshes.

Hierarchical clustering in chameleon f(R) gravity (2013)
Journal Article
Hellwing, W., Li, B., Frenk, C., & Cole, S. (2013). Hierarchical clustering in chameleon f(R) gravity. Monthly Notices of the Royal Astronomical Society, 435(4), 2806-2821. https://doi.org/10.1093/mnras/stt1430

We use a suite of high-resolution state-of-the-art N-body dark matter simulations of chameleon f(R) gravity to study the higher order volume-averaged correlation functions ξ n ¯ ¯ ¯ together with the hierarchical nth-order correlation amplitudes S n... Read More about Hierarchical clustering in chameleon f(R) gravity.

Nonlinear structure formation in the cubic Galileon gravity model (2013)
Journal Article
Barreira, A., Li, B., Hellwing, W., Baugh, C., & Pascoli, S. (2013). Nonlinear structure formation in the cubic Galileon gravity model. Journal of Cosmology and Astroparticle Physics, 2013(10), Article 027. https://doi.org/10.1088/1475-7516/2013/10/027

We model the linear and nonlinear growth of large scale structure in the Cubic Galileon gravity model, by running a suite of N-body cosmological simulations using the ECOSMOG code. Our simulations include the Vainshtein screening effect, which reconc... Read More about Nonlinear structure formation in the cubic Galileon gravity model.

Testing gravity theories via transverse Doppler and gravitational redshifts in galaxy clusters (2013)
Journal Article
Zhao, H., Peacock, J., & Li, B. (2013). Testing gravity theories via transverse Doppler and gravitational redshifts in galaxy clusters. Physical Review D, 88(4), Article 043013. https://doi.org/10.1103/physrevd.88.043013

There is growing interest in testing alternative gravity theories using the subtle gravitational redshifts in clusters of galaxies. However, current models all neglect a transverse Doppler redshift of similar magnitude, and some models are not self-c... Read More about Testing gravity theories via transverse Doppler and gravitational redshifts in galaxy clusters.

Modeling halo mass functions in chameleon f(R) gravity (2013)
Journal Article
Lombriser, L., Li, B., Koyama, K., & Zhao, G. (2013). Modeling halo mass functions in chameleon f(R) gravity. Physical Review D, 87(12), Article 123511. https://doi.org/10.1103/physrevd.87.123511

On cosmological scales, observations of the cluster abundance currently place the strongest constraints on f(R) gravity. These constraints lie in the large-field limit, where the modifications of general relativity can correctly be modeled by setting... Read More about Modeling halo mass functions in chameleon f(R) gravity.

Exploring Vainshtein mechanism on adaptively refined meshes (2013)
Journal Article
Li, B., Zhao, G., & Koyama, K. (2013). Exploring Vainshtein mechanism on adaptively refined meshes. Journal of Cosmology and Astroparticle Physics, 2013(05), Article 023. https://doi.org/10.1088/1475-7516/2013/05/023

There has been a lot of research interest in modified gravity theories which utilise the Vainshtein mechanism to recover standard general relativity in regions with high matter density, such as the Dvali-Gabadadze-Porrati and Galileon models. The str... Read More about Exploring Vainshtein mechanism on adaptively refined meshes.

Parameter space in Galileon gravity models (2013)
Journal Article
Barreira, A., Li, B., Sanchez, A., Baugh, C., & Pascoli, S. (2013). Parameter space in Galileon gravity models. Physical Review D, 87(10), Article 103511. https://doi.org/10.1103/physrevd.87.103511

We present the first constraints on the full parameter space of the Galileon modified gravity model, considering both the cosmological parameters and the coefficients which specify the additional terms in the Lagrangian due to the Galileon field, whi... Read More about Parameter space in Galileon gravity models.

Voids in modified gravity: excursion set predictions (2013)
Journal Article
Clampitt, J., Cai, Y., & Li, B. (2013). Voids in modified gravity: excursion set predictions. Monthly Notices of the Royal Astronomical Society, 431(1), 749-766. https://doi.org/10.1093/mnras/stt219

We investigate the behaviour of the fifth force in voids in chameleon models using the spherical collapse method. Contrary to Newtonian gravity, we find the fifth force is repulsive in voids. The strength of the fifth force depends on the density ins... Read More about Voids in modified gravity: excursion set predictions.

Systematic simulations of modified gravity: chameleon models (2013)
Journal Article
Brax, P., Davis, A., Li, B., Winther, H., & Zhao, G. (2013). Systematic simulations of modified gravity: chameleon models. Journal of Cosmology and Astroparticle Physics, 2013(04), Article 029. https://doi.org/10.1088/1475-7516/2013/04/029

In this work we systematically study the linear and nonlinear structure formation in chameleon theories of modified gravity, using a generic parameterisation which describes a large class of models using only 4 parameters. For this we have modified t... Read More about Systematic simulations of modified gravity: chameleon models.