Dark Matter Redistribution Explains Galaxy Growth and Rotation Curve Development

TL;DR

This paper proposes a modification to hierarchical galaxy formation theory, suggesting dark matter redistribution during galactic activity explains observed galaxy growth and rotation curves more accurately.

Contribution

It introduces a hypothesis that dark matter's elliptical orbits and redistribution during galactic activity improve predictions of galaxy development and rotation curves.

Findings

Galaxies grow in size but not in mass during early development.

Predicted rotation curves are flatter at large radii, matching observations.

The modified theory aligns better with observed galaxy evolution data.

Abstract

There are significant discrepancies between observational evidence and the hierarchical galaxy formation theory with respect to the shape of dark matter halos, the correlation between galaxy characteristics, and galaxy evolutionary history. This paper introduces a modification to the hierarchical galaxy formation theory that hypothesizes that dark matter enters into highly elliptical orbits, and is therefore, effectively redistributed during the period of galactic nuclei activity. Adding this modification, the theory more accurately predicts the observed development history of galaxies and their resulting mature state. In particular, this modification predicts that galaxies grow in size, but not in mass, at an early time (~7 to 10 billion years ago), and develop their characteristic rotation curves which, at large radius, exhibit a relatively flat shape versus the expected Keplerian decline.