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LIGO's discovery of a gravitational wave from two merging black holes (BHs)of similar masses rekindled suggestions that primordial BHs (PBHs) make up thedark matter (DM). If so, PBHs would add a Poissonian isocurvature densityfluctuation component to the inflation-produced adiabatic density fluctuations.For LIGO's BH parameters, this extra component would dominate the small-scalepower responsible for collapse of early DM halos at z>10, where first luminoussources formed. We quantify the resultant increase in high-z abundances ofcollapsed halos that are suitable for producing the first generation of starsand luminous sources. The significantly increased abundance of the early haloswould naturally explain the observed source-subtracted near-IR cosmic infraredbackground (CIB) fluctuations, which cannot be accounted for by known galaxypopulations. For LIGO's BH parameters this increase is such that the observedCIB fluctuation levels at 2 to 5 micron can be produced if only a tiny fractionof baryons in the collapsed DM halos forms luminous sources. Gas accretion ontothese PBHs in collapsed halos, where first stars should also form, wouldstraightforwardly account for the observed high coherence between the CIB andunresolved cosmic X-ray background in soft X-rays. We discuss modificationspossibly required in the processes of first star formation if LIGO-type BHsindeed make up the bulk or all of DM. The arguments are valid only if the PBHsmake up all, or at least most, of DM, but at the same time the mechanismappears inevitable if DM is made of PBHs.

LIGO gravitational wave detection, primordial black holes and the near-IR cosmic infrared background anisotropies