Journal of Geometric Analysis

, Volume 20, Issue 2, pp 439-471

First online:

Linear Representations and Isospectrality with Boundary Conditions

  • Ori ParzanchevskiAffiliated withInstitute of Mathematics, Hebrew University Email author 
  • , Ram BandAffiliated withDepartment of Physics of Complex Systems, The Weizmann Institute of Science

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We present a method for constructing families of isospectral systems, using linear representations of finite groups. We focus on quantum graphs, for which we give a complete treatment. However, the method presented can be applied to other systems such as manifolds and two-dimensional drums. This is demonstrated by reproducing some known isospectral drums, and new examples are obtained as well. In particular, Sunada’s method (Ann. Math. 121, 169–186, 1985) is a special case of the one presented.


Isospectrality Symmetry Hear the shape of a drum Linear representations Boundary value problem Quantum graphs

Mathematics Subject Classification (2000)

58J53 58J32 58D19