Quantcast
  • Register
PhysicsOverflow is a next-generation academic platform for physicists and astronomers, including a community peer review system and a postgraduate-level discussion forum analogous to MathOverflow.

Welcome to PhysicsOverflow! PhysicsOverflow is an open platform for community peer review and graduate-level Physics discussion.

Please help promote PhysicsOverflow ads elsewhere if you like it.

News

New features!

Please do help out in categorising submissions. Submit a paper to PhysicsOverflow!

... see more

Tools for paper authors

Submit paper
Claim Paper Authorship

Tools for SE users

Search User
Reclaim SE Account
Request Account Merger
Nativise imported posts
Claim post (deleted users)
Import SE post

Users whose questions have been imported from Physics Stack Exchange, Theoretical Physics Stack Exchange, or any other Stack Exchange site are kindly requested to reclaim their account and not to register as a new user.

Public \(\beta\) tools

Report a bug with a feature
Request a new functionality
404 page design
Send feedback

Attributions

(propose a free ad)

Site Statistics

123 submissions , 104 unreviewed
3,547 questions , 1,198 unanswered
4,552 answers , 19,366 comments
1,470 users with positive rep
411 active unimported users
More ...

What if UV behaviour of gravity was perturbative?

+ 2 like - 0 dislike
56 views

I understand that the UV behaviour of gravity ought to be dominated by black hole production and that graviton-graviton scattering ought to blow up above the Planck scale. Suppose, however, that gravity was somehow screened above the Planck scale, so that gravity was of constant strength, rather than ever increasing strength, above the Planck scale, and somehow remained perturbative.

Would this imply a maximum curvature? and therefore a minimum radius/mass for a black hole, since small black holes require more curvature. Also, I guess there could be no singularity within a black hole. Could black holes still form, given that arbitrarily small black holes can't exist in this model?

Assuming Hawking radiation, a massive black hole would decay until it reached that minimum radius, at which point it would cease to be a black hole. The contents, and information, would be no longer be trapped, and there was no singularity for it to hit. It would just come out, I suppose.

Is this scenario at all plausible? Where is there likely to be trouble? Does this violate any experiments? Theoretical principles?

This post imported from StackExchange Physics at 2014-03-28 17:12 (UCT), posted by SE-user innisfree
asked Mar 28, 2014 in Theoretical Physics by innisfree (235 points) [ no revision ]
As a side remark, some people argue that this happens in the IR for QCD: QCD would be perturbative in the UV, and attracted to another perturbative fixed point in the IR. For gravity, it seems that the UV fixed point people find is not trivial, so your scenario does not work in this asymptotic safety scenario.

This post imported from StackExchange Physics at 2014-03-28 17:12 (UCT), posted by SE-user Adam

Your answer

Please use answers only to (at least partly) answer questions. To comment, discuss, or ask for clarification, leave a comment instead.
To mask links under text, please type your text, highlight it, and click the "link" button. You can then enter your link URL.
Please consult the FAQ for as to how to format your post.
This is the answer box; if you want to write a comment instead, please use the 'add comment' button.
Live preview (may slow down editor)   Preview
Your name to display (optional):
Privacy: Your email address will only be used for sending these notifications.
Anti-spam verification:
If you are a human please identify the position of the character covered by the symbol $\varnothing$ in the following word:
p$\hbar$ysicsOv$\varnothing$rflow
Then drag the red bullet below over the corresponding character of our banner. When you drop it there, the bullet changes to green (on slow internet connections after a few seconds).
To avoid this verification in future, please log in or register.




user contributions licensed under cc by-sa 3.0 with attribution required

Your rights
...