Op zaterdag 26 maart 2016 20:57:35 UTC+1 schreef Phillip Helbig:
In article , Nicolaas Vroom
writes:

I fully agree. However this has nothing to do with BH's. The problem
is I find the name BH's rather misleading. The issue is that what Ligo
detect is that there are very small objects with relative large masses.

There is absolutely no doubt at all that the recent LIGO detection was
of two merging black holes.


An iteresting document to read is: http://arxiv.org/abs/1602.02444
"Binary Black Hole Mergers from Globular Clusters: Masses, Merger Rates,
and the Impact of Stellar Evolution"
1)At page 4 we read: "These prescriptions, describe the amount of material
that falls back onto the newly-formed compact object for neutrino-driven
and convection-enhanced supernovae."
2)At page 6 we read: "The blue and black points show each binary ejected
after a strong encounter with a single star, with the blue points
indicating binaries that will merge within 12Gyr. "
3)At page 7 we read: " With a relationship between the cluster parameters
and the semi-major axes of the binaries it ejects, we can show how cluster
dynamics determines the inspiral times of BBHs once they are ejected from
the cluster."
4)At page 7 we read: "What is immediately striking is that the median
inspiral time appears to decrease with increasing binary mass, in contrast
to the scaling derived in equation (10).
This is primarily due to the in
uence of the cluster itself: "
5)At page 7 we read: "As the BHs are ejected, the cluster expands and loses
mass, increasing Rh=MGC and significantly increasing the inspiral time of
the lower-mass binaries ejected at late times. "
6) At page 12 we read: "These 25 BHs are the result of repeated stellar
mergers early in the evolutionary history of the cluster.
These collisions are primarily the mergers of massive giant and
main-sequence stars during binary-single and binary-binary encounters,
with a smaller number resulting from direct collisions of single stars."

My understanding from Globular Clusters is that the most common thing
that can happen "inside" such a GC is that single stars are ejected
from the GC. The next is a Binary etc. However as soon when they are
ejected they become lonely (sets of) objects in empty space.
Remark 5 is interesting considering the opposite:
When a binary collects mass, the binary contracts and inspiral time
increases.
The issue is what is the most probably physical phenomena that causes
such an inspiralling of a binary BH. IMO remark 6.
It is tricky to use the Peters equation(36) as an explanation(See page 7)

For readers interesting in my simulation of a BH merger read this;
http://users.telenet.be/nicvroom/VB%...0operation.htm

Nicolaas Vroom