Planck-scale

Maybe if all scales in the compactification are Planck-scale you can get almost anything.

String Theory is Losing the Public Debate Sean 2007

That is, Planck-scale breaking will feed into the low energy theory.

String Theory is Losing the Public Debate Sean 2007

We understand something about proximate (e.g., nucleosynthesis) but not ultimate (sub Planck-scale big-bang) causes.

Witness for the Defense - The Panda's Thumb 2006

While I am (for the reasons explained in that blog post of mine that I linked to earlier) convinced that string theory is the only viable approach to a theory of quantum gravity, I am very uneasy arguing for it based on some hand-wavy claim that the exigencies of Planck-scale physics force us to abandon “point particles” in favour of “1D extended objects.”

Our First Guest Blogger - Lawrence Krauss Mark 2005

A first step of any new theory is obtain that is already known before predict any new (including Planck-scale physics).

Two cheers for string theory Sean 2005

The problem, of course, is not the popular statement of the difficulties for testing Planck-scale physics as you incorrectly argue; the problem is that nobody has obtained the successful standard model from string theory.

Two cheers for string theory Sean 2005

But semi-classical quantum gravity was never viewed as anything more than a stepping stone to a genuine quantum theory of gravity, and its breakdown is expected to be manifested when Planck-scale physics comes into play.

Time Machines Earman, John 2004

“if you could build a Planck-scale collider, string theory predicts, relatively directly, a very specific set of scattering cross sections and behaviour”

From the Sublime to the Ridiculous cjohnson 2005

Planck-scale) energies, they would form a very small black hole.

Singularities and Black Holes Curiel, Erik 2009

The probabilities from it forming through random processes are just obscene (though, granted, a Planck-scale black hole may well be as likely to form as a Planck-scale white hole through vacuum fluctuations). presumably you’d be equally likely to get a black-hole-at-equilibrium as a white-hole-at-equilibrium?

Arrow of Time FAQ Sean 2007