Phys. Rev. D 66, 104024 (2002) [17 pages]Effective Lagrangians and universality classes of nonlinear bigravityReceived 7 June 2002; published 27 November 2002 We discuss the fully nonlinear formulation of multigravity. The concept of universality classes of effective Lagrangians describing bigravity, which is the simplest form of multigravity, is introduced. We show that nonlinear multigravity theories can naturally arise in several different physical contexts: brane configurations, certain Kaluza-Klein reductions and some non-commutative geometry models. The formal and phenomenological aspects of multigravity (including the problems linked to the linearized theory of massive gravitons) are briefly discussed. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.66.104024
DOI:
10.1103/PhysRevD.66.104024
PACS:
04.50.+h, 98.80.Cq
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