# Derivation of a generalized Schr\"odinger equation for dark matter halos from the theory of scale relativity

## TL;DR

This paper derives a generalized Schrödinger equation from scale relativity theory to model dark matter halos, explaining core-halo structures and flat rotation curves without relying solely on quantum mechanics.

## Contribution

It introduces a new wave equation with a logarithmic nonlinearity and a unique coefficient, linking fractal spacetime and chaos to dark matter behavior.

## Key findings

- The equation predicts solitonic cores resolving the cusp problem.
- It accounts for isothermal halos explaining flat rotation curves.
- The model suggests spacetime's fractal structure may solve the cold dark matter crisis.

## Abstract

Using Nottale's theory of scale relativity, we derive a generalized Schr\"odinger equation applying to dark matter halos. This equation involves a logarithmic nonlinearity associated with an effective temperature and a source of dissipation. Fundamentally, this wave equation arises from the nondifferentiability of the trajectories of the dark matter particles whose origin may be due to ordinary quantum mechanics, classical ergodic (or almost ergodic) chaos, or to the fractal nature of spacetime at the cosmic scale. The generalized Schr\"odinger equation involves a coefficient ${\cal D}$, possibly different from $\hbar/2m$, whose value for dark matter halos is ${\cal D}=1.02\times 10^{23}\, {\rm m^2/s}$. We suggest that the cold dark matter crisis may be solved by the fractal (nondifferentiable) structure of spacetime at the cosmic scale, or by the chaotic motion of the particles on a very long timescale, instead of ordinary quantum mechanics. The equilibrium states of the generalized Schr\"odinger equation correspond to configurations with a core-halo structure. The quantumlike potential generates a solitonic core that solves the cusp problem of the classical cold dark matter model. The logarithmic nonlinearity accounts for the presence of an isothermal halo that leads to flat rotation curves. The damping term ensures that the system relaxes towards an equilibrium state. This property is guaranteed by an $H$-theorem satisfied by a Boltzmann-like free energy functional. In our approach, the temperature and the friction arise from a single formalism. They correspond to the real and imaginary parts of the complex friction coefficient present in the scale covariant equation of dynamics that is at the basis of Nottale's theory of scale relativity.