Was gravitational wave signal from a gravastar, not black holes?

IT’S one surprise after another. The detection of gravitational waves announced earlier this year sent ripples through the world of physics. The signal was thought to come from two gigantic black holes merging into one, but now a group says it could have come from something even more exotic – a gravastar.

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CrazyNeutrino said:

The signal was thought to come from two gigantic black holes merging into one,

A Black Hole has no size. Zero, Nada, Zilch!

< /pedant>

sibeen said:

CrazyNeutrino said:

The signal was thought to come from two gigantic black holes merging into one,

A Black Hole has no size. Zero, Nada, Zilch!

< /pedant>

That is bupkus. It has no tangible volume.

> An object almost as compact as a black hole, but with no event horizon, will vibrate in almost the same way.

Are they sure of that?

sibeen said:

CrazyNeutrino said:

The signal was thought to come from two gigantic black holes merging into one,

A Black Hole has no size. Zero, Nada, Zilch!

< /pedant>

Dear pedant,

Not only does a black hole have a size, it has a radius. It’s classical radius is 2MG/c^2

That’s directly analogous to the electron. Both an electron and black hole are point-like, but both have a size. The classical radius of the electron is e^2/Mc^2. It’s a fun exercise to equate the radius of the electron to that of the black hole to get a relationship between charge on the electron and the gravitational constant.

mollwollfumble said:

> An object almost as compact as a black hole, but with no event horizon, will vibrate in almost the same way.

Are they sure of that?

sibeen said:

CrazyNeutrino said:

The signal was thought to come from two gigantic black holes merging into one,

A Black Hole has no size. Zero, Nada, Zilch!

< /pedant>

Dear pedant,

Not only does a black hole have a size, it has a radius. It’s classical radius is 2MG/c^2

That’s directly analogous to the electron. Both an electron and black hole are point-like, but both have a size. The classical radius of the electron is e^2/Mc^2. It’s a fun exercise to equate the radius of the electron to that of the black hole to get a relationship between charge on the electron and the gravitational constant.

That is the sort of math I like. :)

Postpocelipse said:

mollwollfumble said:

> An object almost as compact as a black hole, but with no event horizon, will vibrate in almost the same way.

Are they sure of that?

sibeen said:

A Black Hole has no size. Zero, Nada, Zilch!

< /pedant>

Dear pedant,

Not only does a black hole have a size, it has a radius. It’s classical radius is 2MG/c^2

That’s directly analogous to the electron. Both an electron and black hole are point-like, but both have a size. The classical radius of the electron is e^2/Mc^2. It’s a fun exercise to equate the radius of the electron to that of the black hole to get a relationship between charge on the electron and the gravitational constant.

That is the sort of math I like. :)

I know what maths is, but wtf is a “math”?

bob(from black rock) said:

Postpocelipse said:

mollwollfumble said:

> An object almost as compact as a black hole, but with no event horizon, will vibrate in almost the same way.

Are they sure of that?

Dear pedant,

Not only does a black hole have a size, it has a radius. It’s classical radius is 2MG/c^2

That’s directly analogous to the electron. Both an electron and black hole are point-like, but both have a size. The classical radius of the electron is e^2/Mc^2. It’s a fun exercise to equate the radius of the electron to that of the black hole to get a relationship between charge on the electron and the gravitational constant.

That is the sort of math I like. :)

I know what maths is, but wtf is a “math”?

singular equation……