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/sci/ - Science & Math

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2640916 No.2640916 [Reply] [Original]

WTF is this shit? How can a black hole not have an event horizon? WTF?

http://en.wikipedia.org/wiki/Naked_singularity

>> No.2640932

Well it's theoretical. And doesn't make much sense.
The only logic behind it is that the black hole doesn't have the gravitational force to completely trap light.
But then, how the fuck did it collapse

>> No.2640952

>>2640932
A singularity by definition has no volume. That means you can get infinitely close to it. At some point an object is going to be so close that escaping the singularity will take an escape velocity greater than the speed of lite. That point is the event horizon. Planets, stars, white dwarfs, and neutron stars all have a lot of mass; but they surfaces extend beyond the radius of their possible event horizon. Without a surface, a naked singularity should still have an event horizon.

I've asked my physics professors and not one of them has a clue how naked singularities work. I haven't had much luck searching online either.

>> No.2640953
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2640953

>But then, how the fuck did it collapse

>> No.2640959
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2640959

What kind of math is used in Special Relativity? It can't be that bad. I'm a 4th year undergrad so I haven't even touched Special Relativity yet.

>> No.2640965

>From concepts drawn of rotating black holes, it is shown that a singularity, spinning rapidly, can become a ring-shaped object. This results in two event horizons, as well as an ergosphere, which draw closer together as the spin of the singularity increases. When the outer and inner event horizons merge, they shrink toward the rotating singularity and eventually expose it to the rest of the universe.
Fuck, I can't understand it.

>> No.2640985

>>2640959
how can you be in 4th year and not have done special relativity
in the uk you do it in high school
and the math is very straight forward

>> No.2641000

>>2640985
In Russia, we take an all encompassing special relativity course in middle school.

>> No.2641003

>>2641000
In Soviet Russia, course teaches YOU!

>> No.2641015

>>2640985
We go over special relativity in our "Basic Physics" course 1st semester of Undergrad studies....

>> No.2641021

>>2641000
do you really?

>> No.2641024

>>2641021
I wouldn't be surprised. I mean, for me it's still weird conceptually to think about. However, mathematically it's really not that hard.

>> No.2641051

The naked singulary is more of an odd phenomenon that arises from the math of general relativity. To yield such a naked singulary, you need to impose very special boundary conditions, which in nature quite probably don't exist. Of course it would be nice to have such a thing, but as for now it's just "fantasy".

To get a more in-depth understanding of this, you need to do some calculations on Kerr-black holes.

>> No.2641053
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2641053

>> No.2641104

>>2640959
Vectors with four dimensions.

>> No.2641125

>>2640959 I'm a 4th year undergrad so I haven't even touched Special Relativity yet.
Either you're studying applied sociology or I've got baaad news.

>> No.2641129

>>2640959
>>2640959
Dude we started special relativity in high school

>> No.2641131

>>2641125
I meant general relativity.

>> No.2641136

>>2641131
Tensor algebra

>> No.2641151

>>2641131
Ah, alright then. You probably won't get in touch with it unless you choose to. (I heard my first GR lecture in the 6th semester, so fire away.)

>> No.2641162

>>2641151

Reveal your secrets. What's the need for tensors?