Theories of Everything with Curt Jaimungal cover image

The Woman Who Broke Gravity | Claudia de Rham

Theories of Everything with Curt Jaimungal

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Causality and Velocity: Understanding Limits

The concept of phase velocity and group velocity in physics reveals that superluminal group velocities do not inherently violate causality. While phase velocity can be superluminal and is often viewed as abstract, it is the group velocity that typically conveys information. This distinction becomes crucial when discussing causality, which must be defined within the context of infinite frequency limits of phase velocity. Thus, sending a signal implies a temporal discontinuity, negating the possibility of transmitting information from the beginning of time.

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