from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Plural form of lightcone.


Sorry, no etymologies found.


  • If an occurence at an event A is able to causally affect another occurence at event B, there must be a continuous trajectory in spacetime from event A to event B such that the trajectory lies in or on the lightcones of every event along it.

    Singularities and Black Holes

  • This is because the lightcones for different frames point in different directions.

    The Black Hole War

  • However, the two frames F and F’ may have their lightcones oriented differently.

    Does Space Expand?


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