Space-Time Grains: Roots of Special and Doubly Special Relativity

Foundations of Physics 44 (5):512-522 (2014)

Abstract
We show that the special relativistic dynamics when combined with quantum mechanics and the concept of superstatistics can be interpreted as arising from two interlocked non-relativistic stochastic processes that operate at different energy scales. This interpretation leads to Feynman amplitudes that are in the Euclidean regime identical to transition probability of a Brownian particle propagating through a granular space. Some kind of spacetime granularity could be therefore held responsible for the emergence at larger scales of various symmetries. For illustration we consider also the dynamics and the propagator of a spinless relativistic particle. Implications for doubly special relativity, quantum field theory, quantum gravity and cosmology are discussed
Keywords Relativistic dynamics  Superstatistics  Path integrals  Doubly special relativity
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DOI 10.1007/s10701-013-9758-9
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