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A lowercase g with two lower indices, defining distance itself.
Also known as: Metric tensor, Spacetime metric, g mu nu
The metric tensor says how to measure distance and angle in a curved space, and in general relativity it is the gravitational field — there is no separate force. Its signature, whether written −+++ or +−−−, is a convention that flips signs throughout a text.
Denotes the metric tensor, which defines the interval between nearby events in spacetime.
Contexts: Laboratory
Is the gravitational field in general relativity: curvature of the metric replaces force entirely.
Contexts: Laboratory
Carries a signature convention — −+++ or +−−− — that differs between texts and flips the sign of many quantities.
Contexts: Laboratory
An italic lowercase letter g carrying two small Greek index letters set below and to the right.