Soliton solutions to the Einstein equations in five dimensions

We present a new class of solutions in odd dimensions to Einstein's equations containing either a positive or a negative cosmological constant. These solutions resemble the even-dimensional Eguchi-Hanson-(anti)-de Sitter [(A)dS] metrics, with the added feature of having Lorentzian signatures. They provide an affirmative answer to the open question as to whether or not there exist solutions with a negative cosmological constant that asymptotically approach AdS(5)/Gamma but have less energy than AdS(5)/Gamma. We present evidence that these solutions are the lowest-energy states within their asymptotic class.