"Renormalization"의 두 판 사이의 차이
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18번째 줄: | 18번째 줄: | ||
<h5 style="margin: 0px; line-height: 2em;">regularization</h5> | <h5 style="margin: 0px; line-height: 2em;">regularization</h5> | ||
− | * the values of observable quantities cannot | + | * the values of observable quantities cannot depend on the way we've chosen to take the cutoff (regularize) |
+ | * introducing momentum or distance cutoff so as to render finite the large momentum or short distance limits of correlation functions | ||
* methods of regularization<br> | * methods of regularization<br> | ||
− | ** momentum regularization | + | ** momentum regularization (modify the propagator by introducing cutoff dependent mass couplings) |
− | ** lattice regulatization | + | ** lattice regulatization (replace R^d by a lattice, uses a small space cutoff) |
** dimensional regularization | ** dimensional regularization | ||
* root of the problem<br> | * root of the problem<br> | ||
56번째 줄: | 57번째 줄: | ||
* Renormalization: an introduction to renormalization, the renormalization John C. Collins | * Renormalization: an introduction to renormalization, the renormalization John C. Collins | ||
+ | * Kevin Costello | ||
* [[2009년 books and articles|찾아볼 수학책]] | * [[2009년 books and articles|찾아볼 수학책]] | ||
2011년 12월 3일 (토) 09:53 판
renormalization
- way of pulling out sensible answers from Feynman diagrams that explode
- there are two parts in the renormalization program
- regularization - the divergences must be written down in some way so that they can be compared, added and subtracted
- renormalization proper - the various divergences must be gathered together and extracted from the rest of the calculation
- regularization - the divergences must be written down in some way so that they can be compared, added and subtracted
- set of techniques used to understand a given quantum field theory in a certain energy or length interval
- http://en.wikipedia.org/wiki/Effective_field_theory
- effective ~ restricted to some interval
- easiest to grasp using functional integrals
regularization
- the values of observable quantities cannot depend on the way we've chosen to take the cutoff (regularize)
- introducing momentum or distance cutoff so as to render finite the large momentum or short distance limits of correlation functions
- methods of regularization
- momentum regularization (modify the propagator by introducing cutoff dependent mass couplings)
- lattice regulatization (replace R^d by a lattice, uses a small space cutoff)
- dimensional regularization
- root of the problem
- probability of creating particles of colossal energies
- in terms of Feynman diagrams, the momentum in a loop can run away to infinity
- probability of creating particles of colossal energies
- dimensional regularization
- regularization scheme (especially good in QCD)
- regard the dimension as a continuous quantity
- coupling constant changes accordingly as the dimension changes continuously
- we get a new parameter called regularization scheme
- regularization scheme (especially good in QCD)
QED renormalization
electroweak renormalization
- spontaneous local symmetry breaking or Higgs mechanism
- mass term for gauge field is zero in the Lagranaian, but these bosons (W,Z bosons) have mass term. To resolve this, we employ Higgs mechanism
books
- Renormalization: an introduction to renormalization, the renormalization John C. Collins
- Kevin Costello
- 찾아볼 수학책