Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-11-30
Astronomy and Astrophysics
Astrophysics
9 pages, LaTex. Invited talk at ``Thinking, Observing and Mining the Universe", Sorrento, Italy, September 22-27, 2003 (to app
Scientific paper
I briefly review some scenarios for the role of the Planck length in quantum gravity. In particular, I examine the differences between the schemes in which quantum gravity is expected to introduce a maximum acceleration and the schemes in which the Planck length sets the minimum value of wavelengths (maximum value of momentum). I also comment on some pictures for the structure of spacetime at the Planck scale, such as spacetime discretization and spacetime noncommutativity. I stress that some of these proposals can have significant implications in astrophysics and cosmology.
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