Showing papers in "Nuclear Physics in 1987"

TL;DR: In this article, the authors derived Yukawa couplings in the effective field theory for fermionic strings on orbifolds and applied them to the scattering of four twisted string states, which allowed the extraction of operator product coefficients of conformal twist fields.

TL;DR: In this paper, the complete low-energy effective action to quartic order in the bosonic fields for the heterotic string was calculated and shown to reduce to the supergravity sector of the superstring when the gauge connection is equal to the generalized spin connection.

TL;DR: In this paper, a detailed analysis of W pair production in e+e− annihilation at LEP-II energies is presented by using helicity amplitudes for the process e−e−→W+W− with arbitrary WWγ and WWZ couplings.

TL;DR: In this article, the large soft gluon corrections to short distance hadronic cross sections are summed to all orders in perturbation theory, and the exponentiation of leading and non-leading ln(n) terms in moments of these cross sections is verified.

TL;DR: In this article, the renormalization properties of the Wilson loops containing cusp singularities were investigated in the limit of large and small cusp angles, and the relation of these results to the non-leading infrared behaviour of the quark form factor was demonstrated.

TL;DR: In this article, the equations of motion and effective action for the electromagnetic field were derived for open bosonic strings in a background abelian gauge field, and the effect of the field on the string spectrum and partition function was investigated.

TL;DR: In this article, the authors proved the on-shell equivalence of the order α′ terms in the string effective equations (for the graviton, dilaton and the antisymmetric tensor) to the vanishing of the corresponding (two-loop) terms in Weyl anomaly coefficients for the general bosonic σ-model.

TL;DR: In this article, the connection of recently constructed lower dimensional heterotic strings with conventional toroidal compactification is clarified, and the connection between the two types of string structures is discussed in detail.

TL;DR: In this article, the authors prove that modular invariance and factorization ensure the presence of a massless graviton and the correct connection between spin and statistics, and also prove that the existence of the massless spin-3/2 state ensures the absence of tachyons and vanishing of the one-loop cosmological constant.

TL;DR: In this article, a model for low transverse momentum transfer reactions based on a phenomenological treatment of a hadron as a vortex line in a colour superconducting medium was proposed.

TL;DR: In this paper, the authors study the quantization of free massive fields with spin 1 and 2 in the expanding part of de Sitter spacetime and find that the square of the mass M2 cannot be between 0 (linearized gravity) and 23 × (cosmological constant) in the spin-2 case.

TL;DR: In this paper, a simple set of rules for constructing ultraviolet-finite closed fermionic string models is presented, based on a fermionics formulation of all internal (i.e. toroidally compactified) coordinates.

TL;DR: An infinite set of conformal quantum field theory models is constructed in two dimensions as mentioned in this paper, which possess an infinite-dimensional symmetry generated by a local spin-3 current in addition to the conformal symmetry.

TL;DR: In this paper, a systematic study of modular invariance of partition functions is presented, relevant both for two-dimensional minimal conformal invariant theories and for string propagation on a SU(2) group manifold.

TL;DR: In this paper, the authors proposed a new scenario of the baryon asymmetry generation in the framework of standard electroweak theory which is based on the recent observation that anomalous Baryon number violating processes are nonsuppressed at high temperatures.

TL;DR: In this article, the Fayet-Iliopoulos D-term was shown to be stable under certain conditions and to be able to destabilize the space-time superpotential.

TL;DR: In this paper, the authors consider interactions of strings compactified on orbifolds and show that the resulting Calabi-Yau manifold is non-perturbative from the non-linear sigma model point of view.

TL;DR: A cubic interaction of all massless higher-spin fields with s ⩾ 1 is constructed, based on the extended higher spin superalgebras suggested previously by one of us.

TL;DR: In this article, the Fayet-Iliopoulos D-terms generated at one loop for the heterotic string in any background which preserves four-dimensional space-time supersymmetry and maintains (2,0) world-sheet superconformal invariance were calculated.

TL;DR: In this article, the partition functions of the parafermionic theories of Zamolodchikov and Fateev are computed in terms of the string functions of affine algebra.

TL;DR: Two-dimensional conformal field theory is formulated as analytic geometry on the universal moduli space of Riemann surfaces as mentioned in this paper, which is a generalization of analytic geometry for analytic geometry.

TL;DR: In this paper, the authors studied the bosonization of chiral fermion theories on arbitrary compact Riemann surfaces and obtained explicit expressions for a class of determinants relevant to string theory.

TL;DR: In this article, the helicity amplitudes for multiple bremsstrahlung processes in massless gauge theories in terms of spinor inner-products are derived for the non-abelian case.

TL;DR: In this paper, the authors give a complete proof that d = 11 supergravity compactified on S 7 admits a consistent truncation to its zero-mass sector and the resulting theory is shown to coincide with gauged N = 8 supergravity to all orders.

TL;DR: In this paper, a lattice constructions of ten-dimensional heterotic strings can be applied to four dimensions, based on an extension of Narain's lattices by including the bosonized world-sheet fermions and ghosts, and uses conformal field theory as its starting point.

TL;DR: In this article, the observational consequences of a vacuum energy which decays in time were examined and it was shown that in both radiation and matter dominated eras, the ratio of the vacuum energy to the total energy density of the universe must be small.

TL;DR: In this article, it was shown that the space-time superpotential, which is known to receive no string theoretic corrections in finite orders in α′, is modified by world-sheet instantons.

TL;DR: In this paper, the effects of cosmological asymmetry on various consequences of cold dark matter have been considered and the contribution of stable Dirac neutrinos with masses of a few GeV has been considered.

TL;DR: In this paper, the problem of finding the beta functions and associated spacetime effective action for interacting open and closed strings propagating in background fields was studied, and it was shown that the existence of new string theories which are conformally invariant only after all world sheets have been summed.