Could Anti de Sitter space explain galaxy rotation w/o dark matter?

[ensabah6]

Observations of distant supernova suggests we live in a deSitter Universe, with cold dark matter invoked to explain galaxy rotation curve. Since direct DM detection experiments have come up null, could the presence of matter in the vacuum cause spacetime around it to become Anti de Sitter, one that could explain galaxy rotation curve without invoking dark matter?

Suppose within a galaxy, space is Anti de Sitter, could it have a value that then appears to make gravity stronger than is accounted for by its baryonic content?

 

[AndyW]

Thank you for sharing your thoughts on the potential explanation for galaxy rotation curves through the presence of matter in the vacuum. I would like to offer some insights and considerations on this topic.

Firstly, the current evidence from observations of distant supernovae does indeed suggest that we live in a deSitter Universe. However, this does not necessarily mean that dark matter is not present in our Universe. In fact, dark matter is still the most widely accepted explanation for the observed rotation curves of galaxies.

While direct DM detection experiments have not yielded any conclusive results, there are other indirect methods such as gravitational lensing and the dynamics of galaxy clusters that provide strong evidence for the existence of dark matter. Additionally, the Standard Model of particle physics does not provide a candidate for dark matter, making it a mysterious and elusive entity.

As for the idea of matter in the vacuum causing spacetime to become Anti de Sitter, there are several challenges that need to be addressed. Firstly, the presence of matter in the vacuum would have to be extremely dense and concentrated in order to produce a significant curvature of spacetime. This would require an enormous amount of matter, which is not observed in our Universe.

Furthermore, the Anti de Sitter space is characterized by a negative cosmological constant, which would have a repulsive effect on matter and would not be able to explain the observed gravitational attraction between galaxies. This is in contrast to the positive cosmological constant observed in our Universe, which is attributed to dark energy.

In summary, while the idea of matter in the vacuum causing an Anti de Sitter space is intriguing, it does not provide a satisfactory explanation for the observed rotation curves of galaxies without invoking dark matter. Therefore, further research and observations are needed to fully understand the nature of dark matter and its role in the dynamics of our Universe.