1 / 16

U(1)

U(1). Define a property characterized by a single value. E.G. Objects color Change it uniformally (globally) without changing physics Change is QM change of phase. SU(2). Mixture of two things Same as misture of spin ½ z-components Equivalent to a rotation in a internal 3-4 space.

rosine
Télécharger la présentation

U(1)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. U(1) • Define a property characterized by a single value. • E.G. Objects color • Change it uniformally (globally) without changing physics • Change is QM change of phase

  2. SU(2) • Mixture of two things • Same as misture of spin ½ z-components • Equivalent to a rotation in a internal 3-4 space. • Changes the direction of the axis of quantization.

  3. Local • Transformation depends on position

  4. Rotating the arms through 90o

  5. A+BC+DAC+D+Bbar

  6. Different time ordering same topology

  7. Weak

  8. QCD pion exchange

  9. example

  10. Example

More Related