Let A be an observable (opeator), and we're assuming that for a given state psi(x), the value of A is given by A acting on psi(x), namely - A|psi>.(adsbygoogle = window.adsbygoogle || []).push({});

Also we assume that - P(x) = |psi(x)|^2

So, I'de expect the Expectation value of A to be defined like so:

<A> = Integral[-Inf:+Inf]{ P(x) A psi(x) dx} = Integral[-Inf:+Inf]{ |psi(x)|^2 A psi(x) dx} , which is not <psi|A|psi>, and that's clearly not right. where did i go wrong here?

**Physics Forums - The Fusion of Science and Community**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Calculating expectation value

Loading...

Similar Threads for Calculating expectation value | Date |
---|---|

I Expectation of an operator (observable) how to calculate it | Jan 31, 2017 |

Are the improper integrals used in calculating expectations to be interpreted as principle values? | Sep 20, 2014 |

Expectation value calculation | Apr 17, 2012 |

Calculating the expectation of a quantity using wavefunctions | Mar 9, 2012 |

Normalised wavefunction to calculate the expectation | Apr 25, 2010 |

**Physics Forums - The Fusion of Science and Community**