Die Fragestellung ging auf Analytikers Aussage zurück, ...
Analytiker hat geschrieben:... es sei nicht ausgeschlossen, dass die Dunkle Materie vollständig durch Schwarze Löcher erklärt werden kann, insbesondere primordiale Schwarze Löcher. Die Gravitationswellenforschung kann bei der Häufigkeitsfrage von Schwarzen Löchern große Hilfestellung leisten. Interessant wird es werden, wenn die großen Detektoren mit erhöhter Messempfindlichkeit einen neuen Beobachtungslauf durchführen.
Im Moment kann die Verschmelzungsrate von Schwarzen Löchern einengt werden auf einen Fehlerbalken irgendwo zwischen 10 und 200 pro Jahr und pro Kubikgigaparsec. Bei einer Zahl am oberen Ende dieses Bereichs kann man davon ausgehen, die gesamte Dunkle Materie damit zu erklären.
Das ist m.E. eine durchaus kontroverse Diskussion. Ich bin kein Experte auf dem Gebiet und muss den Veröffentlichungen und zunächst mal Wikipedia glauben:
https://en.m.wikipedia.org/wiki/Primordial_black_hole
Primordial black holes belong to the class of massive compact halo objects (MACHOs). They are naturally a good dark matter candidate: they are (nearly) collision-less and stable (if sufficiently massive), they have non-relativistic velocities, and they form very early in the history of the Universe (typically less than one second after the Big Bang). Nevertheless, tight limits on their abundances have been set up from various astrophysical and cosmological observations,
so that it is now excluded that they contribute importantly to the dark matter over most of the plausible mass range.
In March 2016, one month after the announcement of the detection by Advanced LIGO/VIRGO of gravitational waves emitted by the merging of two 30 solar mass black holes, three groups of researchers proposed independently that the detected black holes had a primordial origin.
Two of them found that the merging rates inferred by LIGO are
consistent with a scenario in which all the dark matter is made of primordial black holes, if a non-negligible fraction of them are somehow clustered within halos such as faint dwarf galaxies or globular clusters, as expected by the standard theory of cosmic structure formation.
The third group claimed that these merging rates are incompatible with an all-dark-matter scenario and that primordial black holes could only contribute to less than one percent of the total dark matter. The unexpected large mass of the black holes detected by LIGO has strongly revived the interest for primordial black holes with masses in the range of 1 to 100 solar masses.
It is however still unclear and debated whether this range is excluded or not by other observations, such as the absence of micro-lensing of stars, the cosmic microwave background anisotropies, the size of faint dwarf galaxies, and the absence of correlation between X-ray and radio sources towards the galactic center.
https://en.m.wikipedia.org/wiki/Massive ... alo_object
Theoretical work simultaneously also showed that ancient MACHOs [black holes, neutron stars, brown dwarfs] are not likely to account for the large amounts of dark matter now thought to be present in the universe. The Big Bang as it is currently understood could not have produced enough baryons and still be consistent with the observed elemental abundances, including the abundance of deuterium. Furthermore, separate observations of baryon acoustic oscillations, both in the cosmic microwave background and large-scale structure of galaxies, set limits on the ratio of baryons to the total amount of matter.
These observations show that a large fraction of non-baryonic matter is necessary regardless of the presence or absence of MACHOs.
