"Regular black holes from pure gravity"

[Liz R]

This physics letter Regular black holes from pure gravity - ScienceDirect  looks like it's trying to show singularities don't have to occur inside BHs. But being a bear of little brain I'm not 100% sure that's what they're saying. Can anyone else explain?

[Brent Meeker]

Needs to be: https://www.sciencedirect.com/science/article/pii/S0370269325000206

It's pretty mathematically dense and I don't have the background to judge how relevant solutions are in D=5.  Topology isn't something you can just take to a smooth limit.

I suspect there's an error in eqn A.9  :-)

Brent

[John Clark]

On Sat, Mar 1, 2025 at 4:07 AM Liz R <liz...@gmail.com> wrote:

> This physics letter Regular black holes from pure gravity - ScienceDirect  looks like it's trying to show singularities don't have to occur inside BHs. But being a bear of little brain I'm not 100% sure that's what they're saying. Can anyone else explain?

They modified Einstein's equations in General Relativity by adding an infinite series of extra terms that provide higher order corrections; when they did this the troublesome singularities at the center of black holes disappeared, no more infinite densities and zero volume. Even better, the end result does not violate the first or second law of thermodynamics. But the trouble is their method only works in five dimensions or higher, not in our 4D spacetime; still it's an impressive start and the authors think eventually they'll find a way to make their method work in 4D too.  

 John K Clark    See what's on my new list at  Extropolis

2to