Gravitational Field & Light Speed: Is Time a Scalar Quantity?

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The speed of light in a gravitational field is not a scalar quantity, as it varies with direction at any given coordinate. While speed is generally considered a scalar in classical mechanics, in the context of general relativity, the coordinate speed of light is not isotropic. Time can be treated as a scalar in certain contexts, but it is also viewed as a component of a four-vector, leading to differing interpretations. Proper time is invariant and can be considered a scalar, while coordinate time is not universally agreed upon as such. The discussion highlights the complexity of defining scalars and vectors in the framework of relativity, emphasizing the need for clarity in terminology.
  • #31
We perceive time as a scalar. However, what we perceive as time is a one dimensional projection of multi-dimension phenomenon.
 

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