Janus Field Theories from Non-Linear BF Theories for Multiple M2-Branes

TL;DR

This paper derives Janus field theories from non-linear BF Lagrangians describing multiple M2-branes, integrating out gauge fields to obtain DBI-type and low-energy effective actions with spacetime-dependent couplings.

Contribution

It introduces a method to derive Janus field theories from non-linear BF theories for M2-branes, including both even and odd M^{IJK} terms, and compares the resulting Lagrangians.

Findings

Derived DBI-type Lagrangian with spacetime-dependent coupling.

Performed iterative integration of gauge fields for low-energy expansions.

Compared Janus field theories from different non-linear BF Lagrangians.

Abstract

We integrate the nonpropagating B_{\mu} gauge field for the non-linear BF Lagrangian describing N M2-branes which includes terms with even number of the totally antisymmetric tensor M^{IJK} in arXiv:0808.2473 and for the two-types of non-linear BF Lagrangians which include terms with odd number of M^{IJK} as well in arXiv:0809:0985. For the former Lagrangian we derive directly the DBI-type Lagrangian expressed by the SU(N) dynamical A_{\mu} gauge field with a spacetime dependent coupling constant, while for the low-energy expansions of the latter Lagrangians the B_{\mu} integration is iteratively performed. The derived Janus field theory Lagrangians are compared.