Coincidence of length spectra does not imply isospectrality Academic Article uri icon


  • Penrose-Lifshits mushrooms are planar domains coming in nonisometric pairs with the same geodesic length spectrum. Recently Zelditch raised the question whether such billiards also have the same eigenvalue spectrum for the Dirichlet Laplacian (conjecturing 'no'). Here we show that generically (in the class of smooth domains) the two members of a mushroom pair have different spectra. 2005 IOP Publishing Ltd.

published proceedings


author list (cited authors)

  • Fulling, S. A., & Kuchment, P.

citation count

  • 3

complete list of authors

  • Fulling, SA||Kuchment, P

publication date

  • August 2005