We consider the Lorentz invariant non-commutative QED and complete the Feynman rules for the theory up to the order θ. In the Lorentz invariant version of the noncommutative QED the particles with fractional charges can be also considered. We show that in the parton model, even at the lowest order, the Bjorken scaling violates as ∼ θQ.

The calculation of the symmetry factor corresponding to a given Feynman diagram is well known to be a tedious problem. We have derived a simple formula for these symmetry factors. Our formula works for any diagram in scalar theory (φ3 and φ4 interactions), spinor QED, scalar QED, or QCD. PACS numbers:11.10.-z, 11.15.-q, 11.15.Bt Typeset using REVTEX 1

In this paper we study non-commutative (NC) QED signatures at photon colliders through pair production of charged leptons(ll) and charged scalars(HH). The NC corrections for the fermion pair production can be easily obtained since NC QED with fermions has been extensively studied in the literature. NC QED with scalars is less studied. To obtain the cross section for HH productions, we first inv...

Vacuum polarization effects are non-perturbatively incorporated into the photon propagator to eliminate the severe infrared problems characteristic of QED 3. The theory is thus rephrased in terms of a massive vector boson whose mass is e 2 /(8π). Subsequently, it is shown that electron-electron bound states are possible in QED 3 .

Gravitational Compton scattering process with a massive fermion is studied in the context of the linearized gravity. Gravitational gauge invariance and graviton transversality cause the transition amplitude to be factorized into that of scalar QED Compton scattering and that of fermion QED Comp-ton scattering with an overall kinematical factor. The factorization is shown explicitly and its phys...

We report on two recent results based on the evaluation of five-loop massless propagators in QCD and QED: (i) corrections of order α 4 s to the absorptive part of the polarization function in QCD with n f = 3; (ii) the five-loop contribution to the β function of quenched QED.

It is shown that even a single e- e+ pair created by a superstrong laser field in vacuum would cause development of an avalanchelike QED cascade which rapidly depletes the incoming laser pulse. This confirms Bohr's old conjecture that the electric field of the critical QED strength E(S) = m2c3/eℏ could never be created.

Cross-site scripting (XSS) and SQL injection errors are two prominent examples of taint-based vulnerabilities that have been responsible for a large number of security breaches in recent years. This paper presents QED, a goal-directed model-checking system that automatically generates attacks exploiting taint-based vulnerabilities in large Java web applications. This is the first time where mod...

A BPHZ renormalized form for the master equation of the field antifield (or BV) quantization has recently been proposed by De Jonghe, Paris and Troost. This framework was shown to be very powerful in calculating gauge anomalies. We show here that this equation can also be applied in order to calculate a global anomaly (anomalous divergence of a classically conserved Noether current), considerin...

Deep inelastic scattering provides us with detailed information on the nucleon structure. In order to extract the parton distribution functions from DIS cross sections and to measure αs(M 2 Z) with high precision it is crucial to control the QED radiative corrections. The 1– and 2–loop leading–log QED corrections were derived in Ref. [1–3]. Complete 1-loop corrections for DIS were given in Refs...