Glueballs and Their Kaluza-Klein Cousins
Hirosi Ooguri, Harlan Robins, Jonathan Tannenhauser

TL;DR
This paper investigates the relationship between Kaluza-Klein states and glueballs in non-supersymmetric Yang-Mills theories using string theory dualities, finding that decoupling of extra states is not clear at leading order.
Contribution
It analyzes the mass spectra of Kaluza-Klein states and glueballs in the supergravity limit, showing their masses are comparable and corrections do not ensure decoupling.
Findings
Kaluza-Klein states have masses similar to glueballs in the supergravity limit.
Leading order corrections do not cause Kaluza-Klein states to decouple.
Decoupling of Kaluza-Klein states remains unclear at this order.
Abstract
Spectra of glueball masses in non-supersymmetric Yang-Mills theory in three and four dimensions have recently been computed using the conjectured duality between superstring theory and large N gauge theory. The Kaluza-Klein states of supergravity do not correspond to any states in the Yang-Mills theory and therefore should decouple in the continuum limit. On the other hand, in the supergravity limit g_{YM}^2 N -> \infty, we find that the masses of the Kaluza-Klein states are comparable to those of the glueballs. We also show that the leading (g_{YM}^2N)^{-1} corrections do not make these states heavier than the glueballs. Therefore, the decoupling of the Kaluza-Klein states is not evident to this order.
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