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Particle Astrophysics Theory

Evidence for MOND from galactic bars to the Hubble tension

by Indranil Banik


Speaker: Dr. Indranil Banik (Univ. of St. Andrews)

About the speaker: Dr. Indranil Banik is an expert on testing MOND and exploring its consequences, starting with a PhD with Dr. Hongsheng Zhao at Saint Andrews. This involved exploring the consequences of a past Milky Way-Andromeda flyby, which is required by MOND. Dr. Banik then worked as a three-year postdoc at Bonn with Pavel Kroupa, with research in many areas, including on the El Gordo galaxy cluster collision (MNRAS, 500, 5249) and the Hubble tension, which is most easily understood as caused by outflow from the observed KBC void (MNRAS, 499, 2845). Dr. Banik is currently working as a postdoc, focusing on test gravity at low accelerations using wide binary stars in the Solar neighbourhood (Arxiv: 2109.03827). Dr. Banik organised a week-long international workshop on MOND in Bonn in 2019. Dr. Banik also supervised several masters and PhD students and peer reviewed many manuscripts for a variety of journals, including MNRAS.

Abstract: I will review the theory known as Milgromian dynamics (MOND) and the evidence for it across a huge range of scales (Arxiv: 2110.06936). The main lines of evidence I discuss are the rotation curves of galaxies, the dynamics of ellipticals, the Local Group satellite galaxy planes, galaxy bar pattern speeds, the El Gordo galaxy cluster collision, the KBC void and the related Hubble tension. I also provide a viable cosmological framework for MOND involving light sterile neutrinos with a mass of 11 eV/c^2 and the same total density as the cold dark matter in the ΛCDM standard cosmological paradigm. I use this to explain observations previously considered problematic for MOND like the cosmic microwave background radiation and the Bullet Cluster, and galaxy clusters more generally.


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