The paper proposes a deepening of the relativity principle, suggesting that the invariant arena for non-quantum physics is a phase space rather than spacetime. It introduces the concept of relative locality, where different observers construct different spacetime projections from an invariant phase space. The framework results from deforming momentum space, affecting energy-momentum conservation laws. The paper discusses the implications of this framework, including the geometry of momentum space and its potential experimental verification.
documents/EFTA01114598.pdf
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