MILGROM’S LAW AND Λ’S SHADOW: HOW MASSIVE GRAVITY CONNECTS GALACTIC AND COSMIC DYNAMICS

• Published in: Journal of The Korean Astronomical Society Vol. 48; no. 3; pp. 191 - 194
• Main Author: Trippe, Sascha
• Format: Journal Article
• Language: English
• Published: 한국천문학회 01.06.2015
• Subjects: 천문학
• ISSN: 1225-4614; 2288-890X
• DOI: 10.5303/JKAS.2015.48.3.191

Massive gravity provides a natural solution for the dark energy problem of cosmology and is also a candidate for resolving the dark matter problem. I demonstrate that, assuming reasonable scaling relations, massive gravity can provide for Milgrom’s law of gravity (or “modified Newtonian dynamics”) which is known to remove the need for particle dark matter from galactic dynamics. Milgrom’s law comes with a characteristic acceleration, Milgrom’s constant, which is observationally constrained to a0 ≈ 1.1×10−10ms−2. In the derivation presented here, this constant arises naturally from the cosmologically required mass of gravitons like a0 ∝ c√ ∝ cH0√3 , with , H0, and being the cosmological constant, the Hubble constant, and the third cosmological parameter, respectively. My derivation suggests that massive gravity could be the mechanism behind both, dark matter and dark energy. KCI Citation Count: 0