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Signatures in the Planck regime. (English) Zbl 1029.83501

Summary: String theory suggests the existence of a minimum length scale. An exciting quantum mechanical implication of this feature is a modification of the uncertainty principle. In contrast to the conventional approach, this generalised uncertainty principle does not allow to resolve space-time distances below the Planck length. In models with extra dimensions, which are also motivated by string theory, the Planck scale can be lowered to values accessible by ultra high energetic cosmic rays (UHECRs) and by future colliders, i.e., \(M_f\approx 1\) TeV. It is demonstrated that in this novel scenario, short distance physics below \(1/M_f\) is completely cloaked by the uncertainty principle. Therefore, Planckian effects could be the final physics discovery at future colliders and in UHECRs. As an application, we predict the modifications to the \(e^+e^-\rightarrow f^+f^-\) cross-sections.

MSC:

83C45 Quantization of the gravitational field
81T30 String and superstring theories; other extended objects (e.g., branes) in quantum field theory
83E30 String and superstring theories in gravitational theory
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