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We present the locally supersymmetric formulation of unimodular gravity theory in D (1 ≤ D ≤ 11) dimensions, namely supergravity theory with the metric tensor whose determinant is constrained to be unity. In such a formulation, the usual finetuning of cosmological constant is no longer needed, but its value is understood as an initial condition. Moreover, the zero-ness of the cosmological constant is concluded as the most probable configuration, based on the effective vacuum functional. We also show that the closure of supersymmetry gauge algebra is consistent with the unimodular condition on the metric.

Describe the function & responsibility of reviewers Objectives: Understand key factors involved in the assessment of the relative strengths & weaknesses of a manuscript Author:

Zebrafish were used to investigate the expression levels of several antiviral and

Is inequality harmful for the environment in a growing economy?

We discuss the role of the U(1) axial symmetry for the phase structure of QCD at finite temperature. We expect that, above a certain critical temperature, also the U(1) axial symmetry will be (effectively) restored. We will try to see if this transition has (or has not) anything to do with the usual chiral transition: various possible scenarios are discussed. In particular, supported by recent lattice results, we analyse a scenario in which a U(1)– breaking condensate survives across the chiral transition. This scenario can be consistently reproduced using an effective Lagrangian model. The effects of the U(1) chiral condensate on the slope of the topological susceptibility in the full theory with quarks are studied: we find that this quantity (in the chiral limit of zero quark masses) acts as an order parameter for the U(1) axial symmetry above the chiral transition. Further information on the new U(1) chiral order parameter is derived from the study (at zero temperature) of the radiative decays of the “light ” pseudoscalar mesons in two photons: a comparison of our results with the experimental data is performed.

We present calculations of the leading and O(1/N) terms in a large-N expansion of the β-functions for various supersymmetric theories: a Wess-Zumino model, supersymmetric QED and a non-abelian supersymmetric gauge theory. In all cases N is the number of a class of the chiral superfields in the theory. Feb 1996Coupling constant perturbation theory has constituted the main approach to quantum field theories since their introduction, but it has its limitations. Therefore any approach which reaches beyond it is worthy of attention: one such is large-N expansions, where N denotes the number of fields (or some subset thereof). Simple theories such as O(N)symmetric φ4 have been much studied [1] as has QCD at both large Nc[2] and Nf[3] [4]. In this paper we calculate the β-functions for a Wess-Zumino model, and also for various supersymmetric gauge theories – supersymmetric QED in the limit of large Nf, i.e. for a large number of chiral superfields, together with an abelian gauged Wess-Zumino model and a more general non-abelian theory. In all cases the leading contribution is a simple one-loop calculation, and things become interesting at O(1/N), when bubble sums are involved. It turns out that the supersymmetric D-algebra part of the calculation is

22 Dec 1999 Quasi-infra-red fixed points and renormalisation group invariant trajectories for non-holomorphic soft supersymmetry breaking I. Jack and D.R.T. Jones

Through the present paper, the code gamgamZZ is presented, which may be used to calculate all possible observables related to the process γγ → ZZ, in either the Standard Model (SM), or the minimal sypersymmetric standard model (MSSM) with real parameters. Work co-funded by the European Union- European Social fund and the National fund PYTHAGO-

On the loop–loop scattering amplitudes in Abelian and non–Abelian gauge theories