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We argue that part of "dark matter" is not made of matter, but of thesingular world-surfaces in the solutions of Einstein's vacuum field equationG_{\mu\nu}=0. Their Einstein-Hilbert action governs also their quantumfluctuation. It coincides with the action of closed bosonic "strings" in fourspacetime dimensions, which appear here in a new physical context. Thus, partof dark matter is of a purely geometric nature, and its quantum physics isgoverned by the same string theory, whose massless spin-2 particles interactlike the quanta of Einstein's theory.

The Purely Geometric Part of "Dark Matter" -- A Fresh Playground for "String Theory"