Journal of Modern Classical Physics & Quantum Neuroscience

Abstract

In many galaxies, it has been observed that the rotation speed curve rises from the galactic center and reaches its maximum at a distance of several kpc, beyond which it is almost flat to the edge of the galaxy disc. If the rotation speed is determined only by the gravity of the stars, it should be smaller toward outside like the Solar system. So, it is thought that the rotation speed curve becomes flat due to the heavy halo component made of dark matter. However, considering that there are more than 100 billion stars in the galaxy and the spiral galaxy has a convex lens-like shape, I devised a bicone model of the galaxy and calculated the rotation speed curve. Then I found that the rotation speed curve is almost flat to the edge of the galaxy disc as observed. It shows that it is not necessary to assume the existence of dark matter in the galaxy. This is what Henri Poincaré predicted in his book in 1908, when he considered that there were around 1 billion stars in the galaxy.