On generalized Melvin solutions for Lie algebras of rank 4

Abstract

We deal with generalized Melvin-like solutions associated with Lie algebras of rank 4 (\(A_4\), \(B_4\), \(C_4\), \(D_4\), \(F_4\)). Any solution has static cylindrically symmetric metric in D dimensions in the presence of four Abelian two-form and four scalar fields. The solution is governed by four moduli functions \(H_s(z)\) (\(s = 1,\ldots ,4\)) of squared radial coordinate \(z=\rho ^2\) obeying four differential equations of the Toda chain type. These functions are polynomials of powers \((n_1,n_2, n_3, n_4) = (4,6,6,4), (8,14,18,10), (7,12,15,16), (6,10,6,6), (22,42,30,16)\) for Lie algebras \(A_4\), \(B_4\), \(C_4\), \(D_4\), \(F_4\), respectively. The asymptotic behaviour for the polynomials at large z is governed by an integer-valued \(4 \times 4\) matrix \(\nu \) connected in a certain way with the inverse Cartan matrix of the Lie algebra and (in \(A_4\) case) the matrix representing a generator of the \({\mathbb {Z}}_2\)-group of symmetry of the Dynkin diagram. The symmetry properties and duality identities for polynomials are studied. We also present two-form flux integrals over a two-dimensional submanifold. Dilatonic black hole analogs of the obtained Melvin-type solutions, e.g. “phantom” ones, are also considered. The phantom black holes are described by fluxbrane polynomials under consideration.