Removing Static Black Hole Singularity without QM (paper)

In summary: Hi. That's correct. The term in the action that conformally couples the scalar fields does change sign in generic solutions, and therefore, fixing the gauge by choosing the term to be a constant (to recover usual gravity) leads to an incomplete evolution in field-space by choice, and therefore, it leads to geodesically incomplete trajectories of particles in the corresponding background.Is this something that has been studied in the past?Yes, this is something that has been studied in the past.
  • #1
MTd2
Gold Member
2,028
25
I thought of posting this on astrophysics or general relativity forums since it seems completely classical, but given the extraordinary claim, I am posting here. Note that one of the guys is a notable string theorist.

http://arxiv.org/abs/1510.03396v1

Journey Beyond the Schwarzschild Black Hole Singularity
Ignacio J. Araya, Itzhak Bars, Albin James
(Submitted on 12 Oct 2015)
We present the geodesical completion of the Schwarzschild black hole in four dimensions which covers the entire space in (u,v) Kruskal-Szekeres coordinates, including the spacetime behind the black and white hole singularities. The gravitational constant switches sign abruptly at the singularity, thus we interpret the other side of the singularity as a region of antigravity. The presence of such sign flips is a prediction of local (Weyl) scale invariant geodesically complete spacetimes which improve classical general relativity and string theory. We compute the geodesics for our new black hole and show that all geodesics of a test particle are complete. Hence, an ideal observer, that starts its journey in the usual space of gravity, can reach the other side of the singularity in a finite amount of proper time. As usual, an observer outside of the horizon cannot verify that such phenomena exist. However, the fact that there exist proper observers that can see this, is of fundamental significance for the construction of the correct theory and the interpretation of phenomena pertaining to black holes and cosmology close to and beyond the singularities.
 
Physics news on Phys.org
  • #2
The suggestion is that the gravitational constant ##G## changes sign. How reasonable is that and how physical is that?
 
  • #3
Hi. I am Ignacio J. Araya (co-author of the paper).
So for observers in the usual gravity region, the sign of G is the usual one, and the physics of things that happen beyond the singularity (even beyond the horizon) won't be accessible to them due to the infinite time-dilation between the observer at infinity and the infalling observer at horizon-crossing. Therefore, the physics in our gravity region is unchanged. Also, the motivation for requiring the sign-change is that in the context of the Weyl-symmetric version of the Standard Model coupled to GR, the term in the action that conformally couples the scalar fields does change sign in generic solutions, and therefore, fixing the gauge by choosing the term to be a constant (to recover usual gravity) leads to an incomplete evolution in field-space by choice, and therefore, it leads to geodesically incomplete trajectories of particles in the corresponding background.
 

1. What is the "Removing Static Black Hole Singularity without QM" paper about?

The paper explores the possibility of removing the singularity at the center of a black hole without relying on quantum mechanics. This is a controversial topic in the field of astrophysics and has been a subject of debate for many years.

2. What is a black hole singularity?

A black hole singularity is a point of infinite density and zero volume at the center of a black hole. According to classical general relativity, all matter and energy in a black hole is compressed into this singularity.

3. Why is it important to remove the singularity in black holes?

Removing the singularity at the center of a black hole would allow us to better understand the fundamental laws of physics that govern the universe. It would also potentially solve the issue of information loss, which is a problem in the current model of black holes.

4. How does the paper propose to remove the singularity without using quantum mechanics?

The paper suggests using a modified version of general relativity that incorporates higher-dimensional spacetime. This allows for the possibility of a non-singular black hole solution.

5. What are the potential implications of removing the singularity in black holes?

If successful, removing the singularity in black holes would have significant implications for our understanding of the universe and could potentially lead to new discoveries in astrophysics. It could also potentially resolve some of the paradoxes and inconsistencies in the current model of black holes.

Similar threads

  • Beyond the Standard Models
Replies
3
Views
2K
  • Beyond the Standard Models
Replies
21
Views
3K
  • Beyond the Standard Models
Replies
7
Views
4K
  • Beyond the Standard Models
Replies
1
Views
1K
Replies
11
Views
1K
  • Beyond the Standard Models
Replies
28
Views
4K
Replies
17
Views
5K
  • Special and General Relativity
Replies
4
Views
2K
  • Special and General Relativity
Replies
2
Views
1K
Replies
20
Views
2K
Back
Top