Modified Newtonian dynamics effects in a region dominated by dark matter and a cosmological constant $\varLambda $

Haranas, Ioannis; Cobbett, Kristin; Gkigkitzis, Ioannis; Alexiou, Athanasios; Cavan, Eli

doi:10.1007/s10509-020-03882-7

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2021

2023

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Cited by 6 publications

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“…( 2) in a future work, let us mention here that such a potential has been studied by various authors, e.g. in [7][8][9][10][11], and the orbits in this potential have been computed in [12]. It is clear from the above functional dependence of V (r) that there exist regions defined by the length scales r 1 and r 2 , that each term in Eq.…”

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confidence: 99%

Gravitational lensing and missing mass

Das¹,

Sur²

2023

Preprint

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The mass of an astrophysical object can be estimated by the amount of gravitational lensing of another object that it causes. To arrive at the estimation however, one assumes the validity of the inverse square law of gravity, or equivalently an attractive 1/r potential. We show that the above, augmented by a logarithmic potential at galactic length scales, proposed earlier to explain the flat galaxy rotation curves, predicts a larger deflection angle for a given mass. In other words, the true mass of the object is less than its estimated value. This may diminish the importance and role of dark matter in explaining various observations.

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confidence: 99%