Unitarity and singular backgrounds
نویسندگان
چکیده
منابع مشابه
Singular Unitarity in “quantization Commutes with Reduction”
Let M be a connected compact quantizable Kähler manifold equipped with a Hamiltonian action of a connected compact Lie group G. Let M//G = φ(0)/G = M0 be the symplectic quotient at value 0 of the moment map φ. The space M0 may in general not be smooth. It is known that, as vector spaces, there is a natural isomorphism between the quantum Hilbert space over M0 and the G-invariant subspace of the...
متن کاملStrings in Singular Time - Dependent Backgrounds 1
We review the construction of time-dependent backgrounds with space-like singularities. We mainly consider exact CFT backgrounds. The algebraic and geometric aspects of these backgrounds are discussed. Physical issues, results and difficulties associated with such systems are reviewed. Finally, we present some new results: a two dimensional cosmology in the presence of an Abelian gauge field de...
متن کاملA Class of Non-singular Gravi-dilaton Backgrounds
We present a class of static, spherically symmetric, non-singular solutions of the tree-level string effective action, truncated to first order in α ′. In the string frame the solutions approach asymptotically (at r → 0 and r → ∞) two different anti-de Sitter configurations, thus interpolating between two maximally symmetric states of different constant curvature. The radial-dependent dilaton d...
متن کاملStrangeness and Unitarity
The strange-quark vector current form factors of the nucleon are analyzed within the framework of dispersion relations. Particular attention is paid to contributions made by KK̄ intermediate states to the form factor spectral functions. It is shown that, when the KK̄ → NN̄ amplitude is evaluated in the Born approximation, the KK̄ contributions are identical to those arising from a one-loop calculat...
متن کاملΓγ and Unitarity *
Agreement between the experimental value Γ(KS → γγ) and the number predicted via a one-loop chiral perturbation theory calculation has been cited as a success for the latter. On the other hand the one-loop prediction for the closely related process KL → π0γγ has been found to be a factor three below the experimental value. Using the inputs of unitarity and dispersion relations, we demonstrate t...
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: Physical Review D
سال: 2013
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.88.096007