English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We give a classification of non-Abelian T-duals of the flat metric in D=4dimensions with respect to the four-dimensional continuous subgroups of thePoincare group. After dualizing the flat background, we identify majority ofdual models as conformal sigma models in plane-parallel wave backgrounds, mostof them having torsion. We give their form in Brinkmann coordinates. We find,besides the plane-parallel waves, several diagonalizable curved metrics withnontrivial scalar curvature and torsion. Using the non-Abelian T-duality, wefind general solution of the classical field equations for all the sigma modelsin terms of d'Alembert solutions of the wave equation.

Plane-parallel waves as duals of the flat background