NASA's NuSTAR mission rocketed into space today. The black-hole-hunting  observatory has communicated with Earth and has oriented its solar panels toward the sun.
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So, if Paul Frampton is right, and dark matter is 100,000 stellar mass black holes (therefore about a million in the Milky Way) how long until we know? 
 
We checked in with Daniel Stern, the NuSTAR project scientist. Here's what he had to say:

Interesting question, James.  Indeed, many people, including (but not starting with) Paul Frampton, have considered whether primordial black holes left over from the Big Bang could constitute some or all of the dark matter that we know pervades our Universe.  So-called "intermediate mass black holes," with masses 1000's of times that of our Sun, have been investigated by several authors.  Constraints come from several directions, including the thickness of the Milky Way disk.  NuSTAR does have some planned programs investigating candidate intermediate mass black holes, but a true measurement of how common such systems are and the fraction of dark matter which could consist of such objects is not likely to be a program that works to NuSTAR's strengths.
 
+NASA Jet Propulsion Laboratory Thank you so much for your kind help!  You and your readers may be interested over the course of the mission in this mini-biography of papers consistent with the idea of black holes as dark matter.  I am sure that Dr. Stern has read most if not all of these papers, judging from his credentials at science.jpl.nasa.gov/people/Stern but I will make sure he sees iopscience.iop.org/2041-8205/720/1/L67/pdf/2041-8205_720_1_L67.pdf and http://arxiv.org/pdf/1205.6467v1.pdf in particular -- which weigh very heavily on the constraints you mention -- with the email form on his web page.

http://arxiv.org/pdf/0910.1152v1.pdf -- Frampton and Ludwick's 2009 basic 100,000 solar mass peak calculation for primordial IMBHs.

http://www.sciencedirect.com/science/article/pii/S0920563210001003 -- Frampton's 2010 explanation of why 100,000 solar mass dark matter IMBHs are consistent with the orbits of wide binaries, microlensing, and galactic disk stability. (WIMPs still struggle with the cuspy halos, not to mention dwarf galaxies.)

http://iopscience.iop.org/2041-8205/720/1/L67/pdf/2041-8205_720_1_L67.pdf -- Lacki and Beacom's 2010 "Almost All Or Almost Nothing" paper indicating that most all of the WIMPs would have fallen into black holes if there are more than a very small number of them.

http://arxiv.org/pdf/1205.4012v1.pdf a very new paper explaining the conditions under which primordial black holes are allowed by nucleosynthesis element ratios; basically if inflation didn't happen at a constant rate.

http://arxiv.org/pdf/1204.3619v2.pdf another very recent paper showing "new pathways to PBH dark matter candidacy" using reduced dimensional analyses. 

http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2966.2006.10801.x/abstract -- Lodato and Natarajan's 2006 theory of supermassive black hole formation which someone cited in opposition to the existence of IMBHs, but which actually describes the production of 100,000 solar mass black holes.

http://arxiv.org/pdf/1205.6467v1.pdf -- this brand new paper suggests that supermassive black holes' early quasar behavior kept the other black holes from being able to grow.
 
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