DETECTORS FOR THE COSMIC AXIONIC WIND

TL;DR

This paper proposes experimental methods to detect a cosmic axionic condensate, a candidate for dark matter, considering various axion masses and their implications for cosmology and galaxy stability.

Contribution

It introduces new experimental schemes for detecting axionic dark matter, focusing on the potential Bose condensate state of axions in the universe.

Findings

Dark matter constitutes most of the universe's mass.

Axions could form a Bose condensate in the early universe.

Proposed detection methods depend on axion mass range.

Abstract

We propose experimental schemes for detection an axionic condensate supposed to be cosmic dark matter. Various procedures are considered in dependence on the value of the axion mass. There are well known indications that a large part of the Universe mass exists in a form of dark matter: The analysis of rotation curves of galaxies leads to the conclusion that the mass of luminous matter is less than 1/10 part of the total galaxies mass. The existence of the dark matter is supported by the so called "virial paradoxes". It turns out that the reach and compact galaxies have unacceptible large $\bar{\bf v^2}$ being in the same time stable with respect to anothers characteristics. For such the galaxies to be stable their masses must be one order greater than the observable ones. There are theoretical and observational arguments that this dark matter cannot be usual barionic matter as dust, planets etc. On the other hand there are attractive models where the dark matter is non-relativistic gas of light elementary particles weakly interacting with the "usual" matter. Periodicity in the distribution of quasars and distant galaxies with the red shift could be naturally explained in the cosmology with a gas of very light (pseudo)Goldstone bosons filling the Universe. It is well known that during a cooling an ideal Bose gas undergo the Bose condensation. If the decoupling of axions has been enough early in the cosmological evolution the axion gas should be in that moment of time in the Bose condensate state.