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Secular matrix

  1. Jan 9, 2004 #1
    does anybody know the origins behind the *name* secular matrix?

    i don't understand why a secular matrix would be called... secular.
     
  2. jcsd
  3. Jan 9, 2004 #2

    HallsofIvy

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    First, the term "secular" matrix is not a mathematical term- it is a physics term. If you look up the word "secular" in a dictionary, you will find that one of its meanings has to do with time. The "secular matrix" in quantum physics is the matrix that represents the evolution of a an operator over time.
     
  4. Jan 9, 2004 #3

    selfAdjoint

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    Saeculum is the Latin noun meaning "a long period of time", sometimes interpreted in modern times as a century. Nominative plural saecula, plural genitive saeculorum (as in the great seal of the US: Novus ordo saeculorum = "A new order for the ages")

    Secular effects in Astronomy are those that take place over a long time, gradually accumulating.

    The other meaning of secular, "not religious", comes from the division in the middle ages of topics that were religious = heavenly = outside of time, versus the other kind that were bound to the flow of time found here below.
     
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