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SUMMARY:Does the presence of old globular clusters in low-mass galaxies di
 sprove modified gravity?
DTSTART;VALUE=DATE-TIME:20230322T114000Z
DTEND;VALUE=DATE-TIME:20230322T114200Z
DTSTAMP;VALUE=DATE-TIME:20241114T092437Z
UID:indico-contribution-255@meetings.aip.de
DESCRIPTION:Speakers: Michal Bilek ()\nThe discussion "dark matter vs. mod
 ified gravity" has not been resolved yet. It was proposed that dynamical f
 riction could be used to discriminate between the two alternatives. Analyt
 ic calculations indicate that\, with modified gravity\, globular clusters 
 (GCs) of low-mass galaxies experience much stronger dynamical friction tha
 n in the equivalent system with Newtonian gravity and dark matter. As a re
 sult\, in modified gravity the dynamical friction should have already forc
 ed the old GCs of low mass galaxies to settle in the centers of the galaxi
 es. This is not observed. I will report on our efforts to verify the analy
 tic results by self-consistent simulations with the MOND gravity. We publi
 shed already that the core stalling mechanism\, that was not considered in
  the analytic calculations\, prevents GC to settle in centers of ultra-dif
 fuse galaxies. In our ongoing work\, we investigate GCs of isolated dwarf 
 galaxies. It seems so far that GCs of these galaxies survive if the do not
  move within the galaxy disk\, or if they counterrotate with respect of th
 e galaxy disk. In the simulations done so far\, supernova explosions influ
 ence the orbits of GCs only at low numerical resolution.\n\nhttps://iaus37
 9.aip.de/event/20/contributions/255/
LOCATION:Haus H\, Telegrafenberg
URL:https://iaus379.aip.de/event/20/contributions/255/
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