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rrchr
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Can BH be formed during star formation process? For instance, giant gas cloud or several collided clouds. In this case, can BH be created right after BB? Thank you.
rrchr said:In this case, can BH be created right after BB? Thank you.
gendou2 said:all black holes of appreciable size would be the result of collapsed dead stars.
I'm thinking the force, gravity, is always present. Since any type of matter can be used to "make" a BH, probability of BH formation was significantly higher in the "beginning of time" due to higher matter concentration.gendou2 said:Clouds of gas won't form a black hole all by themselves. It takes a whole lot of force to crush gaseous matter into a small enough space that a black hole is formed. With the possible exception mentioned by George Jones, all black holes of appreciable size would be the result of collapsed dead stars. I suppose extremely high energy collisions could form black holes, but this isn't something I imagine happens very often in a giant cloud of gas.
Sundance said:G'day from the land of ozzzzz
People talk about as if there was a start or a origin to the universe.
Than they apply conditions of how black holes can form.
There is no need to do that.
The conditions occur ongoing.
The processes during a supernova creates excess neutrons via the entanglement of electromagnetic fields a property of plasma double layers. This process compacts Neutrons to the core of the Neutron Star.
If there is suficient matter, theoretically the next stage, Neutrons break down to quarks again via entanglement of the EM fields compacting quarks. If sufficient trapping horizons are formed, the core becomes the so called black hole entrapping EMR, making it look like a black hole.
Experiments with Z-pinch dynamics on Earth are very promissing to expalin such processes.
No magic no ad hoc ideas to make it work.
The biggest black hole beats out its nearest competitor by six times. Fortunately, it’s 3.5 billion light years away, forming the heart of a quasar called OJ287. Quasars are extremely bright objects in which matter spiraling into a giant black hole emits large amounts of radiation.
The smaller black hole, which weighs about 100 million Suns, orbits the larger one on an oval-shaped path every 12 years. It comes close enough to punch through the disc of matter surrounding the larger black hole twice each orbit, causing a pair of outbursts that make OJ287 suddenly brighten.
We consider stationary, axially and equatorially symmetric systems consisting of a central rotating and charged degenerate black hole and surrounding matter. We show that a2 + Q2 = M2 always holds provided that a continuous sequence of spacetimes can be identified, leading from the Kerr Newman solution in electrovacuum to the solution in question. The quantity a = J/M is the black hole's intrinsic angular momentum per unit mass, Q its electric charge and M is the well-known black hole mass parameter introduced by Christodoulou and Ruffini.
There seems to be some confusion in this post ...Sundance said:G'day from the land of ozzzz
The progressive formation of a black hole is proceeded by the formation of a Neutron Matrix, than if matter is sufficient the compaction proceeds to a high density degenerate matter that is able to form the Gravitaional/magnetic fields that are able to hold back EMR from escaping.
As formation from clouds, the process would take Gyrs to form without a gravity sink.
Maybe you should research the formation of black holes. Knowing where stellar black forms and how through merging develop into monsters.
http://www.dailygalaxy.com/my_weblog/2008/03/18-billion-suns.html
18 Billion Suns -A Galaxy Classic: Biggest Black Hole in Universe Discovered—and it’s BIG
A universal constraint between charge and rotation rate for degenerate black holes surrounded by matter
Feb 2008
http://adsabs.harvard.edu/abs/2008CQGra..25c5009A
Equilibrium Configurations of Degenerate Fermionic Dark Matter and the Black Hole Mass Hierarchy
00 2008
http://adsabs.harvard.edu/abs/2008ralc.conf...98N
We propose degenerate fermionic dark matter to explain the flat-top density profile of the cluster A1689 recently observed.
Symmetry Properties of Black Holes in Higher Dimensional General Relativity
00 2008
http://adsabs.harvard.edu/abs/2008PThPS.172..202I
We discuss symmetry properties of black holes in general relativity---known as black hole rigidity---of which basic assertion is that the event horizon of an asymptotically flat, stationary black hole with certain matter fields must be a Killing horizon and is rephrased (combined together with staticity results) that such a black hole must be either static, or axisymmetric. A precise formulation of the rigidity theorem for black holes with non-degenerate event horizon in arbitrary spacetime dimensions has been recently made by Hollands, Wald and the present author. [Hollands, S., Ishibashi, A. and Wald, R. M., Commun. Math. Phys. 271 (2007), 699.] In our formulation, no assumptions concerning the topology of cross-sections of event horizon (other than the compactness) are made. Therefore, different from Hawking's original proof given in 4-dimensions, our proof applies also to non-spherical black holes, which are known to occur in higher dimensions but not in 4-dimensions.
Joe143 said:A black hole forms when any object reaches a certain critical density, and its gravity causes it to collapse to an almost infinitely small pinpoint.
rrchr said:Can BH be formed during star formation process?
A black hole is a region of space where the gravitational pull is so strong that nothing, including light, can escape from it. It is formed by the collapse of a massive star.
Black holes are formed during the death of a massive star. When a star runs out of fuel, it can no longer produce energy to counteract its own gravity. The core of the star collapses and forms a black hole.
No, only stars with a mass of at least 20 times that of our sun can form black holes during their death. Smaller stars, like our sun, will become white dwarfs or neutron stars.
Scientists use various methods to detect black holes, such as observing the effects of their strong gravitational pull on surrounding matter. They also use mathematical models and simulations to study the formation and behavior of black holes.
Understanding the origin of black holes can help us better understand the behavior and properties of these mysterious objects. It can also provide insights into the evolution of galaxies and the universe as a whole. Additionally, studying black holes can lead to advancements in astrophysics and our understanding of gravity.