Is MOND Affecting the Universe's Expansion?

[kurious]

The gravitational force acting on a particle of mass m, on the
surface of a sphere of radius 10^26 metres and with a mass of 10^52
kg is given by
G x10^52 m / (10^26) ^ 2

The acceleration is given by G x10^52 / (10^26) ^ 2 = 10^ - 11 m/ s^2

This is the magnitude of accleration at which modified Newtonian dynamics
becomes a mathematically accurate description of the velocities of stars in spiral galaxies.MOND describes a gravitational force that is stronger than
the usual Newtonian expectation.As the universe expands beyond 10^26 metres,
if MOND is valid as a force law,then we should expect the acceleration of the expansion of the universe at distances greater than 10^26 metres,to be slower than expected.Does anyone agree with this?

 

[AndyW]

I would like to provide some clarifications and additional information on the topic of modified Newtonian dynamics (MOND) and its potential implications for the expansion of the universe.

Firstly, it is important to note that MOND is a theory that proposes an alternative explanation for the observed discrepancies between the predicted and observed velocities of stars in spiral galaxies. It suggests that there may be a different, stronger gravitational force at play, rather than the currently accepted theory of dark matter.

Secondly, the equation provided in the forum post is correct in terms of calculating the gravitational force on a particle on the surface of a sphere with a mass of 10^52 kg and a radius of 10^26 meters. However, it is not directly related to MOND or the expansion of the universe.

Thirdly, while MOND may provide a better fit for the velocities of stars in spiral galaxies, it has not been proven to be a universally applicable theory. It is still a subject of ongoing research and debate among scientists.

Lastly, the expansion of the universe is not directly affected by MOND. The expansion of the universe is primarily driven by the force of dark energy, which is a separate phenomenon from MOND. Therefore, it is not accurate to say that the acceleration of the expansion of the universe would be slower if MOND were a valid force law.

In conclusion, while MOND may have implications for our understanding of gravitational forces in certain situations, it is not directly related to the expansion of the universe. Further research and evidence are needed to fully understand the potential effects of MOND on our understanding of the universe.