Publication

Proposed new probe of modified gravity

Alexey Boyarsky, Oleg Ruchayskiy
2011
Journal Articles

Abstract

We suggest a new efficient way to constrain a certain class of large scale modifications of gravity. We show that the scale-free relation between density and size of dark matter halos, predicted within the ACDM model with Newtonian gravity, gets modified in a wide class of theories of modified gravity. (C) 2010 Elsevier B.V. All rights reserved.

Official source

https://infoscience.epfl.ch/entities/publication/78b40331-55ce-4f57-8aa1-e52436b40656

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Alexey Boyarsky, Oleg Ruchayskiy
2011
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/78b40331-55ce-4f57-8aa1-e52436b40656

About this result

Related concepts (21)

Gravity

In physics, gravity () is a fundamental interaction which causes mutual attraction between all things that have mass. Gravity is, by far, the weakest of the four fundamental interactions, approximately 1038 times weaker than the strong interaction, 1036 times weaker than the electromagnetic force and 1029 times weaker than the weak interaction. As a result, it has no significant influence at the level of subatomic particles.

F(R) gravity

DISPLAYTITLE:f(R) gravity () is a type of modified gravity theory which generalizes Einstein's general relativity. () gravity is actually a family of theories, each one defined by a different function, , of the Ricci scalar, . The simplest case is just the function being equal to the scalar; this is general relativity. As a consequence of introducing an arbitrary function, there may be freedom to explain the accelerated expansion and structure formation of the Universe without adding unknown forms of dark energy or dark matter.

Dark matter halo

According to modern models of physical cosmology, a dark matter halo is a basic unit of cosmological structure. It is a hypothetical region that has decoupled from cosmic expansion and contains gravitationally bound matter. A single dark matter halo may contain multiple virialized clumps of dark matter bound together by gravity, known as subhalos. Modern cosmological models, such as ΛCDM, propose that dark matter halos and subhalos may contain galaxies.

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