On the only three Short Distance Structures which can be described by Linear Operators

Details On the only three Short Distance Structures which can be described by Linear Operators On the only three Short Distance Structures which can be described by Linear Operators

1998-06-01

arxiv.org/abs/hep-th/9806013v1

Rept.Math.Phys.43:171-177,1999

Physics

High Energy Physics

High Energy Physics - Theory

7 pages, LaTeX

Scientific paper

10.1016/S0034-4877(99)80025-1

We point out that if spatial information is encoded through linear operators $X_i$, or `infinite-dimensional matrices' with an involution $X_i^*=X_i$ then these $X_i$ can only describe either continuous, discrete or certain "fuzzy" space-time structures. We argue that the fuzzy space structure may be relevant at the Planck scale. The possibility of this fuzzy space-time structure is related to subtle features of infinite dimensional matrices which do not have an analogue in finite dimensions. For example, there is a slightly weaker version of self-adjointness: symmetry, and there is a slightly weaker version of unitarity: isometry. Related to this, we also speculate that the presence of horizons may lead to merely isometric rather than unitary time evolution.

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