Results 1 - 10 of 7827
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[en] We analyze the cosmological solutions to the recently proposed nonlocal quantum effective action for gravity with a cosmological term. We show that the vacuum energy decays with a slow-roll parameter proportional to the anomalous gravitational dressings (paper)
[en] We develop the superfield background field method and study the effective action in the N = 2, d3 supersymmetric Chern-Simons-matter systems. The one-loop low-energy effective action for non-Abelian supersymmetric Chern-Simons theory is computed to order F4 by use of N = 2 superfield heat kernel techniques.
[en] Global symmetries for d = 10 superparticle model in the superspace zm (χμ, ΘL, ΘR), with kinetic terms for Bose and Fermi variables are shown to form superalgebra, which includes super-Poincare algebra as a subalgebra. The subalgebra in this case is realized in the space of variables of the model in a nonstandard way. We derive a local version of this model, which is off-shell globally supersymmetric and dynamically equivalent to the Siegel superparticle, but with off-shell closed algebra of local symmetries. 17 refs
[en] In this Letter we analyse the Bagger–Lambert–Gustavsson (BLG) theory in N=1 superspace. Furthermore, we will construct the BRST transformations for this theory. These BRST transformations will be integrated out to obtain the finite field dependent version of BRST (FFBRST) transformations. We will also analyse the effect of the FFBRST transformations on the effective action. We will thus show that the FFBRST transformations can be used to relate generating functionals of the BLG theory in two different gauges
[en] We formulate the worldline quantization (a.k.a. deformation quantization) of a massive fermion model coupled to external higher spin sources. We use the relations obtained in this way to show that its regularized effective action is endowed with an symmetry. The same result holds also for a massive scalar model.
[en] Two multiplicative anomalies are evaluated for the determinant of the conformal higher spin propagating operator on spheres given by Tseytlin. One holds for the decomposition of the higher derivative product into its individual second order factors and the other applies to its complete linear factorization. Using this last factorization, I also calculate the determinants explicitly in terms of the Riemann ζ-function, for both even and odd dimensions. In the latter case there is, of course no multiplicative anomaly. The conformal anomaly is also found for arbitrary spin and dimension and exhibited for the eight- and ten-spheres. (paper)
[en] Starting from the chiral covariant effective action approach of Banerjee and Kulkarni (2008 Phys. Lett. B 659 827), we provide a derivation of the Hawking radiation from a charged black hole in the presence of gravitational back reaction. The modified expressions for charge and energy flux, due to the effect of one-loop back reaction are obtained
[en] The procedure of averaging in an instanton medium is discussed. It is shown that the effect of the instanton medium on light quarks (Nf = 1) is equivalent to an interaction of fermions with an effective mass with massless bosonic spinor fields. The fact that the instanton liquid is dilute makes it possible to use perturbation theory. 14 refs., 1 fig
[en] The effective action of (2+1)-dimensional quantum electrodynamics is considered in the one-loop approximation at nonzero temperature, chemical potential, and external magnetic field. It is shown that, besides the Landau oscillations in the parameter (m2/eH)(μ/m-1), the thermodynamic potential has an oscillatory dependence on the quantity T/√eH. 35 refs