The star SO-2 at the galactic center was recently at its closest distance to the supermassive black hole (SMBH). It allowed measuring relativistic effects. The observations confirm that the general relativity is the best gravitational theory compared to other alternative theories . But although an excellent agreement with the observations is obtained all along the orbit, a discrepancy in the redshift of SO-2 is measured at its periastron. An excess of around 20% (240 km/s instead of 200 km/s) has been observed. This discrepancy has been predicted in the paper . It should come from the second component (gravitic field) of the general relativity generated by SgrA*. In general, the expected value of this component of general relativity is negligible. But in the frame of the explanation of dark matter (as the gravitic field of the clusters ), the gravitic field of the galaxies should be larger than expected. It is in this theoretical frame (without exotic matter and in agreement with general relativity) that this discrepancy was predicted. Furthermore, its value is in agreement with the expected gravitic field computed in . These results would mean that the gravitic field of large astrophysical structures (galaxies, clusters, ...) would be greater than expected and that the explanation of dark matter by the gravitic field could be a pertinent solution (in agreement with general relativity and without exotic matter). Furthermore, this explanation implies necessarily movements of dwarf satellite galaxies along planes, movements that seem to be more and more likely and allows retrieving experimental relations. This dark matter explanation would then solve several kinds of problems with this specific component of general relativity currently neglected.
Cite this paper
Corre, S. L. (2018). Dark Matter: SO-2’s Gravitational Redshift Could Give an Important Clue to Solve the Dark Matter Mystery. Open Access Library Journal, 5, e5028. doi: http://dx.doi.org/10.4236/oalib.1105028.
Phillips J.I., Cooper, M.C., Bullock, J.S. and Boylan-Kolchin, M. (2015) Are Rotating Planes of Satellite Galaxies Ubiquitous? Monthly Notices of the Royal Astronomical Society, 453, 3839-3847. https://doi.org/10.1093/mnras/stv1770
Müller, O., Pawlowski, M.S., Jerjen, H. and Lelli, F. (2018) A Whirling Plane of Satellite Galaxies around Centaurus A Challenges Cold Dark Matter Cosmology. Science, 359, 534-537. https://doi.org/10.1126/science.aao1858