According to energy mass conversion law, mass can be converted to energy. So is it possible to convert dark matter into dark energy?
Answer
Mass and energy are the same thing. If you have a sealed internally reflective box of photons, it will have inertia and a exert a gravitational pull on any other mass/energy that may be around.
http://usersguidetotheuniverse.com/?p=2865
That being said, no properties of dark matter or dark energy are known. These terms are used to refer to matter and energy that "must be there" due to the "total" matter/energy inferred through indirect observations not agreeing with the directly observed matter/energy in the universe.
To determine whether there are processes that can convert dark matter into energy, we'd first have to discover what dark matter is.
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