A chiral perturbation expansion for gravity
نویسندگان
چکیده
منابع مشابه
A Chiral Perturbation Expansion for Gravity
A formulation of Einstein gravity, analogous to that for gauge theory arising from the Chalmers-Siegel action, leads to a perturbation theory about an asymmetric weak coupling limit that treats positive and negative helicities differently. We find power counting rules for amplitudes that suggest the theory could find a natural interpretation in terms of a twistor-string theory for gravity with ...
متن کاملBARYON CHIRAL PERTURBATION THEORY IN THE 1/Nc EXPANSION
The chiral Lagrangian for baryons is formulated in an expansion in 1/Nc. The chiral Lagrangian implements the contracted spin-flavor symmetry of large-Nc baryons as well as nonet symmetry of the leading planar diagrams. Large-Nc consistency conditions ensure that chiral loop corrections are suppressed in 1/Nc through exact cancellation of chiral loop graphs to fixed orders in 1/Nc. Application ...
متن کاملCHIRAL PERTURBATION THEORY AND THE 1/Nc-EXPANSION
1 Expansion in the quark masses and 1/Nc It is generally accepted that QCD possesses an exact U(3)R×U(3)L flavour symmetry in the limitmu=md=ms= 0,Nc→∞. We furthermore assume that (a) the axial part of this symmetry is spontaneously broken and (b) that, in the vicinity of this point, the low energy properties of the theory are governed by the Goldstone bosons associated with this symmetry break...
متن کاملChiral Perturbation Theory: a Primer
Recently methods have been developed which exploit the chiral symmetry of QCD in order to make rigorous contact with low energy particle physics phenomenology. In these lectures we present a pedagogical introduction to these techniques. Research supported in part by the National Science Foundation and by the Department of Energy
متن کاملApplication for a Novel Perturbation Expansion Method
We formulate a coupled vibration problem between a structure and an acoustic field by FEM. The problem leads to a non-standard eigenvalue problem. Furthermore, we introduce a coupling strength parameter ε as a multiplier applied to the non-diagonal coupling terms. A natural interpretation of this parameter is given. We represent an eigenpair for the coupled system by a perturbation series with ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2006
ISSN: 1029-8479
DOI: 10.1088/1126-6708/2006/02/057