MG14 - Talk detail |
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Participant |
Hernandez, Xavier | |||||||
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Institution |
Instituto de Astronomia, UNAM - Instituto de Astronomia, CU, UNAM, AP 70-264 - Mexico City - D.F. - Mexico | |||||||
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Session |
AT1 |
Accepted |
Yes |
Order |
6 |
Time |
16:50 | 20' |
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Talk |
Oral abstract |
Title |
Evidence for Extended Gravity across Astrophysical Scales. | |||||
| Coauthors | Reginaldo Durazo Moreno, Bernardo Cervantes-Sodi | |||||||
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Abstract |
For any MONDian extended theory of gravity where the rotation curves of spiral galaxies are explained through a change in gravity rather than the ad hoc hypothesis of dark matter, a generic dynamical behaviour is expected for pressure supported systems: An outer flattening of the velocity dispersion profile occurring at a characteristic radius, where both the amplitude of this flat velocity dispersion and the radius at which it appears are predicted to show distinct scalings with the total mass of the system. By carefully analysing dynamics of globular clusters, elliptical galaxies and galaxy cluster, we show that the expectations of extended gravity are met, across eight orders in magnitude in mass. This observed scalings are not expected under dark matter cosmology, and would require particular explanations tuned at the scales of each distinct astrophysical systems. |
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