Fontanini, Michele ; Spallucci, Euro ; Padmanabhan, T. (2006) Zeropoint length from string fluctuations Physics Letters B: Nuclear Physics and Particle Physics, 633 (45). pp. 627630. ISSN 03702693

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S03702...
Related URL: http://dx.doi.org/10.1016/j.physletb.2005.12.039
Abstract
One of the leading candidates for quantum gravity, viz. string theory, has the following features incorporated in it. (i) The full spacetime is higherdimensional, with (possibly) compact extradimensions; (ii) there is a natural minimal length below which the concept of continuum spacetime needs to be modified by some deeper concept. On the other hand, the existence of a minimal length (zeropoint length) in fourdimensional spacetime, with obvious implications as UV regulator, has been often conjectured as a natural aftermath of any correct quantum theory of gravity. We show that one can incorporate the apparently unrelated pieces of informationzeropoint length, extradimensions, string Tdualityin a consistent framework. This is done in terms of a modified KaluzaKlein theory that interpolates between (highenergy) string theory and (lowenergy) quantum field theory. In this model, the zeropoint length in four dimensions is a "virtual memory" of the length scale of compact extradimensions. Such a scale turns out to be determined by Tduality inherited from the underlying fundamental string theory. From a low energy perspective short distance infinities are cutoff by a minimal length which is proportional to the square root of the string slope, i.e., √α^{1}. Thus, we bridge the gap between the string theory domain and the low energy arena of pointparticle quantum field theory.
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