Cosmological tests of modified gravity

What is general relativity for cosmology?
General Relativity forms the basis for the disciplines of cosmology (the structure and origin of the Universe on the largest scales) and relativistic astrophysics (the study of galaxies, quasars, neutron stars, etc.), and has led to a number of dramatic predictions concerning the physical world: Black holes..
What is the modified gravity theory?
Essentially, modified gravity assumes that on the largest and/or smallest scales, gravity acts in novel ways compared to the well-tested scales in the middle (including those ceaselessly probed by toddlers)..
Why modifying gravity doesn t add up?
Modifications to gravity cannot predict deviations from the observed trajectories, which match the predictions of known physics with a non-modified General theory of Relativity..
Newton's law of universal gravitation is usually stated as that every particle attracts every other particle in the universe with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

Apr 17, 2015In this review, we first give an overview of recent developments in modified gravity theories including f(R) gravity, braneworld gravity,

What is general relativity for cosmology?