When I am reading about the Wilson approach to renormalization in Chapter12.1 of Peskin & Shroeder I am wondering why are you allowed only to contract the [itex]\hat{\phi}[/itex] field (this is the field that carries the high-momentums degrees of freedom)as they show in equation 12.10, I thought that we should add all the contractions, between all the 4 fields and here is the term they are making the example of:(adsbygoogle = window.adsbygoogle || []).push({});

[itex]\int \mathcal{D}\hat{\phi}exp\left(-\int d^{d}x \frac{\lambda}{4}\phi^{2}\hat{\phi}^{2}\right)[/itex]

**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!

# The renormalization group

Loading...

Similar Threads - renormalization group | Date |
---|---|

A Did nature or physicists invent the renormalization group? | Mar 7, 2018 |

A On the renormalization group flow | May 27, 2016 |

Error in Srednicki renormalization? | Dec 16, 2015 |

Explaining renormalization group equations for effective couplings | May 9, 2013 |

Understanding the renormalization group | Apr 25, 2013 |

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