Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Intrinsic Nature of Dark Matter in the Galactic Halo

Version 1 : Received: 10 August 2020 / Approved: 12 August 2020 / Online: 12 August 2020 (08:05:22 CEST)

How to cite: CAMCI, U. Intrinsic Nature of Dark Matter in the Galactic Halo. Preprints 2020, 2020080274 (doi: 10.20944/preprints202008.0274.v1). CAMCI, U. Intrinsic Nature of Dark Matter in the Galactic Halo. Preprints 2020, 2020080274 (doi: 10.20944/preprints202008.0274.v1).

Abstract

We obtain more straightforwardly the main intrinsic features of dark matter distribution in the halos of galaxies by considering the spherically symmetric space-time, which satisfies the flat rotational curve condition, and the geometric equation of state resulting from the modified gravity theory. In order to measure the equation of state for dark matter in the galactic halo, we provide a general formalism taking into account the modified f(X) gravity theories. Here, f(X) is a general function of X∈{R,G,T}, where R,G and T are the Ricci scalar, the Gauss-Bonnet scalar and the torsion scalar, respectively. These theories yield that the flat rotation curves appear as a consequence of the additional geometric structure accommodated by those of modified gravity theories. Constructing a geometric equation of state wX≡pX/ρX and inspiring by some values of the equation of state for the ordinary matter, we infer the properties of dark matter in galactic halos of galaxies.

Subject Areas

galaxies: modified gravity; dark matter; halos; flat rotation curves

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