Splashback in galaxy clusters as a probe of cosmic expansion and gravity

Adhikari, Susmita; Sakstein, Jeremy; Jain, Bhuvnesh; Dalal, Neal; Li, Baojiu

doi:10.1088/1475-7516/2018/11/033

Title: Splashback in galaxy clusters as a probe of cosmic expansion and gravity

Journal Article · Tue Nov 20 00:00:00 EST 2018 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2018/11/033· OSTI ID:1610993

Adhikari, Susmita ^[1]; Sakstein, Jeremy ^[2]; Jain, Bhuvnesh ^[2]; Dalal, Neal ^[3]; Li, Baojiu ^[4]

Stanford Univ., CA (United States). Kavli Institute for Particle Astrophysics and Cosmology; Univ. of Illinois at Urbana-Champaign, IL (United States)
Univ. of Pennsylvania, Philadelphia, PA (United States)
Perimeter Institute for Theoretical Physics, Waterloo, ON (Canada)
Durham Univ. (United Kingdom)

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 modified gravity theories. In modified gravity models, the transition from screened to unscreened regions typically occurs in the cluster outskirts, suggesting potentially observable signatures in the splashback feature. We investigate the location of splashback in both chameleon and Vainshtein screened models and find significant differences compared with ΛCDM predictions. We also observe an interesting interplay between dynamical friction and modified gravity, providing a distinctive signature for modified gravity models in the behavior of the splashback feature as a function of galaxy luminosity.

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Research Organization:: Univ. of Pennsylvania, Philadelphia, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0007901

OSTI ID:: 1610993

Journal Information:: Journal of Cosmology and Astroparticle Physics, Vol. 2018, Issue 11; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 43 works

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