RE: Detecting nuggets of dark matter
Will there be any relationship between matter and energy for this case?
Recent developments in string compactifications demonstrate obstructions to the simplest constructions of low energy cosmologies with positive vacuum energy. The existence of obstacles to creating scale-separated de Sitter solutions indicates a UV/IR puzzle for embedding cosmological vacua in a unitary theory of quantum gravity. Motivated by this puzzle, we propose an embedding of positive energy Friedmann-Lemaître-Robertson-Walker cosmology within > string theory. Our proposal involves confining 4D gravity on a brane which mediates the decay from a nonsupersymmetric five-dimensional anti–de Sitter false vacuum to a true vacuum. In this way, it is natural for a 4D observer to experience an effective positive cosmological constant coupled to matter and radiation, avoiding the need for scale separation or a fundamental de Sitter vacuum.
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.121.261301
I am sorry, but I am not sure to understand the question. Dark matter has to account for a significant fraction of the energy budget of the universe, so that I would tend to answer 'yes' to your question.
By the way, the article you are referring to has nothing to do with the topic addressed is this post, as this consists in a string theory model for cosmology.
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