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1.  Sridhar, S; Kudrolli, A Experiments on not ‘‘hearing the shape’’of drums (Journal Article) In: Physical review letters, 72 (14), pp. 2175, 1994. @article{sridhar1994experiments, title = {Experiments on not ‘‘hearing the shape’’of drums}, author = {S Sridhar and A Kudrolli}, year = {1994}, date = {19940101}, journal = {Physical review letters}, volume = {72}, number = {14}, pages = {2175}, publisher = {American Physical Society}, abstract = {We present an experimental test of the theorem of isospectral domains which states that certain pairs of planar domains have identical spectra for eigenvalues of the Laplacian operator or the Helmholtz wave equation. The experiments employ thin microwave cavities shaped in the form of two different domains known to be isospectral. We verify the equality of at least 54 of the measured lowlying eigenvalues to a few parts in 10 4. We also obtain the eigenfunctions experimentally, and confirm that two nonisometric transformations connect isospectral eigenfunction pairs. An analysis in terms of periodic orbits using the trace formula is also carried out, and shown to be an alternative confirmation of isospectrality.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We present an experimental test of the theorem of isospectral domains which states that certain pairs of planar domains have identical spectra for eigenvalues of the Laplacian operator or the Helmholtz wave equation. The experiments employ thin microwave cavities shaped in the form of two different domains known to be isospectral. We verify the equality of at least 54 of the measured lowlying eigenvalues to a few parts in 10 4. We also obtain the eigenfunctions experimentally, and confirm that two nonisometric transformations connect isospectral eigenfunction pairs. An analysis in terms of periodic orbits using the trace formula is also carried out, and shown to be an alternative confirmation of isospectrality. 
1994 

1.  Sridhar, S; Kudrolli, A Experiments on not ‘‘hearing the shape’’of drums Journal Article Physical review letters, 72 (14), pp. 2175, 1994. Abstract  BibTeX  Tags: Experimental Mathematics @article{sridhar1994experiments, title = {Experiments on not ‘‘hearing the shape’’of drums}, author = {S Sridhar and A Kudrolli}, year = {1994}, date = {19940101}, journal = {Physical review letters}, volume = {72}, number = {14}, pages = {2175}, publisher = {American Physical Society}, abstract = {We present an experimental test of the theorem of isospectral domains which states that certain pairs of planar domains have identical spectra for eigenvalues of the Laplacian operator or the Helmholtz wave equation. The experiments employ thin microwave cavities shaped in the form of two different domains known to be isospectral. We verify the equality of at least 54 of the measured lowlying eigenvalues to a few parts in 10 4. We also obtain the eigenfunctions experimentally, and confirm that two nonisometric transformations connect isospectral eigenfunction pairs. An analysis in terms of periodic orbits using the trace formula is also carried out, and shown to be an alternative confirmation of isospectrality.}, keywords = {Experimental Mathematics}, pubstate = {published}, tppubtype = {article} } We present an experimental test of the theorem of isospectral domains which states that certain pairs of planar domains have identical spectra for eigenvalues of the Laplacian operator or the Helmholtz wave equation. The experiments employ thin microwave cavities shaped in the form of two different domains known to be isospectral. We verify the equality of at least 54 of the measured lowlying eigenvalues to a few parts in 10 4. We also obtain the eigenfunctions experimentally, and confirm that two nonisometric transformations connect isospectral eigenfunction pairs. An analysis in terms of periodic orbits using the trace formula is also carried out, and shown to be an alternative confirmation of isospectrality. 