Monitoring of galactic revolving curves provides evidence that leads toward the existence of dark matter. It is a non-baryonic form of matter that accounts for approximately 85% of matter in the observable Universe.
Current evaluations of galactic revolving curves are base upon a framework of Newtonian records of gravity. A new research paper published in EPJ C, by Gerson Otto Ludwig, National Institute for Space Research, Brazil, proposes that if this is interchanged with a general relativity-based model, the need to recourse to dark matter is released, replaced by the results of gravitomagnetism.
The foremost purpose of dark matter, Ludwig indicates in his research paper, has historically been to determine the variation between astrophysical observations and current hypotheses of gravity. In simple words, if baryonic matter — the form of matter we observe around us every day is composed of neutrons, electrons, and protons — is the only form of matter. Then there shouldn’t be sufficient gravitational force to stop galaxies from flying apart.
By neglecting general relativistic emendations to Newtonian gravity resulting from mass currents, and by ignoring these mass currents, Ludwig states these models also miss major modifications to revolving curves — the orbital velocities of visible stars and gas plotted against their radial extent from their galaxy’s center. This is because a frame-dragging or the Lense Thirring effect in general relativity is not present in Newton’s theory of gravity. This outcome appears when a bulky rotating object like a star or black hole ‘drags’ the very fabric of spacetime along with it, in turn giving rise to a gravitomagnetic field.
In this research paper, Ludwig indicates a new model for the revolving curves of galaxies which is in conjunction with previous efforts involving general relativity. The researcher explains that even though the effects of gravitomagnetic fields are inadequate, factoring them into models mitigates the distinction between theories of gravity and observed revolving curves — eliminating the need for dark matter.
The theory still requires some improvement before it is universally accepted, with the author mainly pointing out that the time evolution of galaxies modeled with this framework is a complicated problem that will need much deeper analysis.
Ludwig ends by proposing that all calculations done with thin galactic disk models performed up until this point may have to be re-calculated, and the theory of dark matter itself, questioned.
Reference: “Galactic rotation curve and dark matter according to gravitomagnetism” by G. O. Ludwig, 23 February 2021, The European Physical Journal C.