Galactic Sun's motion in the Cold Dark Matter, MOdified Newtonian Dynamics and MOdified Gravity scenarios

Abstract

We numerically integrate the equations of motion of the Sun in Galactocentric Cartesian rectangular coordinates for -4.5 Gyr <= t <= 0 in Newtonian mechanics with two different models for the Cold Dark Matter (CDM) halo, in MOdified Newtonian Dynamics (MOND) and in MOdified Gravity (MOG) without resorting to CDM. The initial conditions used come from the latest kinematical determination of the 3D Sun's motion in the Milky Way (MW) by assuming for the rotation speed of the Local Standard of Rest (LSR) the recent value Θ_0=268 km s^-1 and the IAU recommended value Θ_0=220 km s^-1; the Sun is assumed located at 8.5 kpc from the Galactic Center (GC). For Θ_0=268 km s^-1 the birth of the Sun, 4.5 Gyr ago, would have occurred at large Galactocentric distances (12-27 kpc depending on the model used), while for Θ_0=220 km s^-1 it would have occurred at about 8.8-9.3 kpc for almost all the models used. The integrated trajectories are far from being circular, especially for Θ_0=268 km s^-1, and differ each other with the CDM models yielding the widest spatial extensions for the Sun's orbital path.

LaTex2e, 6 pages, 3 figures, 7 tables

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Cited by in corpus (5)

• Preliminary bounds of the gravitational Local Position Invariance from Solar System planetary precessions
• Influence of the cosmic repulsion on the MOND model of the Magellanic Cloud motion in the field of Milky Way
• Constraint on dark matter central density in the Eddington inspired Born-Infeld (EiBI) gravity with input from Weyl gravity
• Observational Constraints on the Modified Gravity Model (MOG) Proposed by Moffat: Using the Magellanic System
• Anthropic constraints on the cosmological constant from Sun's motion through the Milky Way