A moving particle has an associated dark matter displacement wave. In a double slit experiment the particle enters and exits a single slit. The associated dark matter displacement wave enters and exits multiple slits. When the dark matter displacement wave exits the slits it creates interference and the direction the particle travels is altered. Detecting the particle causes decoherence of the associated dark matter displacement wave (i.e. turns the wave into chop) and there is no interference.

‘Ether and the Theory of Relativity by Albert Einstein’
http://www-groups.dcs.st-and.ac.uk/~history/Extras/Einstein_ether.html

“Since according to our present conceptions the elementary particles of matter are also, in their essence, nothing else than condensations of the electromagnetic field”

The electromagnetic field is dark matter. Matter is the condensation of dark matter.

DOES THE INERTIA OF A BODY DEPEND UPON ITS ENERGY-CONTENT?’ A.EINSTEIN
http://www.fourmilab.ch/etexts/einstein/E_mc2/e_mc2.pdf

“If a body gives off the energy L in the form of radiation, its mass diminishes by L/c2.”

The mass of the body does diminish, but the matter which no longer exists as part of the body has not vanished. It still exists, as dark matter. As matter converts to dark matter it expands in three dimensional space. The physical effects this transition has on the neighboring dark matter and matter is energy. Mass is conserved.