The Scalar Curvature of a Causal Set

Details The Scalar Curvature of a Causal Set The Scalar Curvature of a Causal Set

2010-01-15

arxiv.org/abs/1001.2725v4

Phys.Rev.Lett.104:181301,2010

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Typo in definition of equation (3) and definition of n(x,y) corrected. Note: published version still contains typo

Scientific paper

10.1103/PhysRevLett.104.181301

A one parameter family of retarded linear operators on scalar fields on causal sets is introduced. When the causal set is well-approximated by 4 dimensional Minkowski spacetime, the operators are Lorentz invariant but nonlocal, are parametrised by the scale of the nonlocality and approximate the continuum scalar D'Alembertian, $\Box$, when acting on fields that vary slowly on the nonlocality scale. The same operators can be applied to scalar fields on causal sets which are well-approximated by curved spacetimes in which case they approximate $\Box - {{1/2}}R$ where $R$ is the Ricci scalar curvature. This can used to define an approximately local action functional for causal sets.

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