Glueball mass spectrum from supergravity

We calculate the spectrum of glueball masses in non-supersymmetric Yang-Mil ls theory in three and four dimensions, based on a conjectured duality betw een supergravity and large N gauge theories. The glueball masses are obtain ed by solving supergravity wave equations in a black hole geometry. We find that the mass ratios are in good numerical agreement with the available la ttice data. We also compute the leading (g(YM)(2)N)(-1) corrections to the glueball masses, by taking into account stringy corrections to the supergra vity action and to the black hole metric. We find that the corrections to t he masses are negative and of order (g(YM)(2)N)(-3/2). Thus for a fixed ult raviolet cutoff the masses decrease as we decrease the 't Hooft coupling, i n accordance with our expectation about the continuum limit of the gauge th eories.