Abstract
The strong equivalence principle is violated by gravity theories of Milgromian dynamics [modified Newtonian dynamics (MOND)] through the action of the external field effect. We test two different Lagrangian theories Aquadratic-Lagrangian (AQUAL) and quasilinear MOND (QUMOND) based on their numerical solutions of the external field effect, by comparing two independent estimates of the mean external field strength of the nearby universe: a theory-deduced value from fitting the outer rotation curves of 114 galaxies and an empirical value from the large-scale distribution of cosmic baryons. The AQUAL-deduced external field strength from rotation curves agrees with that from the large-scale cosmic environment, while QUMOND-deduced value is somewhat higher. This suggests that AQUAL is likely to be preferred over QUMOND as an effective nonrelativistic limit of a potential relativistic modified gravity theory.
Original language | English |
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Article number | 103025 |
Number of pages | 7 |
Journal | Physical Review D |
Volume | 106 |
Issue number | 10 |
Early online date | 15 Nov 2022 |
DOIs | |
Publication status | Published - 21 Nov 2022 |