Zobrazeno 1 - 10
of 1 508
pro vyhledávání: '"Frenkel, J."'
Publikováno v:
Annals of Physics 470 (2024) 169801
We examine the Einstein-Cartan (EC) theory in first-order form, which has a diffeomorphism as well as a local Lorentz invariance. We study the renormalizability of this theory in the framework of the Batalin-Vilkovisky formalism, which allows for a g
Externí odkaz:
http://arxiv.org/abs/2409.10493
Publikováno v:
Annals of Physics 462, 169607 (2024)
We consider the Einstein-Cartan theory with the tetrad $e_{\mu}^{a}$ and spin connection $\omega_{\mu ab}$ taken as being independent fields. Diffeomorphism invariance and local Lorentz invariance result in there being two distinct gauge transformati
Externí odkaz:
http://arxiv.org/abs/2401.16343
Publikováno v:
Physical Review D 107, 085020 (2023)
We calculate in a general background gauge, to one-loop order, the leading logarithmic contribution from the graviton self-energy at finite temperature $T$, extending a previous analysis done at $T=0$. The result, which has a transverse structure, is
Externí odkaz:
http://arxiv.org/abs/2304.00166
We examine some features of the non-renormalizability induced through the use of low-energy effective Lagrangians in loop diagrams, in the context of a scalar model which is ultraviolet finite and partially soluble. In this framework, one can directl
Externí odkaz:
http://arxiv.org/abs/2302.11059
We deduce, in a general background gauge, the counter-term Lagrangian for pure quantum gravity to one-loop order. As an application, we evaluate the leading quantum correction to the classical gravitational potential, generated by the vacuum polariza
Externí odkaz:
http://arxiv.org/abs/2208.13004
It is shown that the usual expression for a Feynman diagram in terms of the Feynman propagator $\Delta_F(x-y)$ can be replaced by an equivalent expression involving the positive-energy on-shell propagator $\Delta^+(x-y)$, supplemented by appropriate
Externí odkaz:
http://arxiv.org/abs/2206.14860
We examine, in the `t Hooft renormalization scheme, the analytic running coupling $\bar\alpha_t(Q^2)$ in QCD, using the two-loop $\beta$-function with positive expansion parameters $\beta_0$ and $\beta_1$. An exact integral representation is derived
Externí odkaz:
http://arxiv.org/abs/2205.03142
Publikováno v:
Phys. Rev. D 104, 105007 (2021)
We study, in the imaginary time formalism, the relation between loops and on-shell forward scattering tree amplitudes in thermal field theories. This allows for an efficient evaluation, at all temperatures, of Green's functions with causal retarded b
Externí odkaz:
http://arxiv.org/abs/2110.07694
Publikováno v:
Canadian Journal of Physics. 100(3): 139-144 (2021)
We study the Yang-Mills theory and quantum gravity at finite temperature, in the presence of Lagrange multiplier fields. These restrict the path integrals to field configurations which obey the classical equations of motion. This has the effect of do
Externí odkaz:
http://arxiv.org/abs/2105.00318
Publikováno v:
Annals of Physics 434, 168659 (2021)
Quantizing any model in which a Lagrange multiplier (LM) field is used to restrict field configurations to those that satisfy the classical equations of motion, leads to at most one-loop radiative corrections. This approach can be used with both the
Externí odkaz:
http://arxiv.org/abs/2102.02854