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MOdified Newtonian Dynamics

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gravitational redshift<br />

• gravitational redshift effect from clusters<br />

of galaxies is embedded in their velocity<br />

dispersion data (Cappi 1995)<br />

• stacking kinematic data of a large number<br />

of clusters (several thousands or more)<br />

can pull out the gravitational redshift<br />

effect (Wojtak et al. 2011)

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