What is Modified Gravity?

Modified Gravity refers to a class of theories proposing alterations to Einstein's theory of General Relativity, aiming to explain gravitational phenomena and cosmic observations without relying on hypothetical dark matter or dark energy.

Why do scientists consider Modified Gravity theories?

Scientists explore these theories to address significant cosmological puzzles, such as the accelerated expansion of the universe and the rotational curves of galaxies, which General Relativity explains with unseen dark matter and dark energy.

How do Modified Gravity theories differ from General Relativity?

While General Relativity describes gravity as spacetime curvature caused by mass-energy, Modified Gravity theories propose that gravity's fundamental laws change, especially on very large scales or weak fields, altering how matter interacts.

Do Modified Gravity theories replace Dark Matter and Dark Energy?

Many Modified Gravity theories aim to provide an alternative explanation for the phenomena currently attributed to dark matter and dark energy by modifying gravity itself, potentially removing the need for these elusive components.

How are Modified Gravity theories tested?

These theories are tested against a wide range of astrophysical observations, including galaxy dynamics, gravitational lensing, the Cosmic Microwave Background, and gravitational wave detections, to see if they accurately predict observed phenomena.