Im working on deriving the final expression on the attached picture. The problem is that of a particle in a potential coupled to a "bath" of harmonic oscillators but I'm not sure how you arrive at the final expression. First of all, why are you allowed to assume that q is periodic on the interval [0,T(adsbygoogle = window.adsbygoogle || []).push({}); ^{-1}]? And secondly how should I use this? Should I plug in the fourier series expansion of q? And in that case what should I do with the integral in dt' (which I suppose has been transformed to an integral in τ by t'->-iτ)

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

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

# Condensed matter problem with Feynman integral

Loading...

Similar Threads - Condensed matter problem | Date |
---|---|

I Opening of a band gap - Diffraction at the edge of BZ zones? | Jul 3, 2016 |

A What do people mean by "dynamical phase transition"? | Mar 25, 2016 |

Huh? Condensates can exchange particles without effect? | Apr 20, 2015 |

Relation between condensed matter physics and QFT | Jan 26, 2007 |

Bose-Einstein Condensates. What is a matter wave ? | Feb 12, 2004 |

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