Erik Verlinde’s entropic gravity was claimed to explain dark matter in galaxy rotation curves as a modification to gravity similar to Modified Newtonian Dynamics MOND. But does it really work as good as MOND? Has Verlinde truly derived MOND and its acceleration scale constant from first principles?
Verlinde’s Entropic Gravity and Dark Matter Read More »
MOND predicts galaxy rotation curves but falls short in galaxy clusters. A variable acceleration scale constant in MOND is proposed within a Machian interpretation, which predicts a boost of accelerations in galaxy clusters without the need for new constants or free parameters, in constrast to EMOND. We test the proposed formulation in a toy model and generalize the it by introducing a directionless field as a scalar sum of inverse-squared distance mass contributions. In colaboration with Juan D. Santander.
Machian MOND: a variable acceleration scale constant in galaxy clusters Read More »
Mach’s principle deeply influenced Einstein’s General Relativity, and following attempts to extend gravity theories. It’s implications and ideas are explained in relation to relative acceleration, inertial forces, Newton’s bucket of water experiment, and the gravitational constant, as an introduction to theories of modified inertia such as MOND.
Mach’s principle: introduction to MOND and modified inertia Read More »
The lack of a phenomenological explanation of Modified Newtonian Dynamics and its falling short in galaxy clusters suggest that MOND is an approximation of a more fundamental theory of modified gravity or inertia. There is strong evidence for Mach’s principle and the relativity of inertia to be behind MOND, explaining dark matter effects in galaxies. A classical Machian theory implementing the relativity of inertia has been presented. A Machian explanation of MOND is in progress.