By Mike Dolan - What matters in U.S. and global markets today By Mike Dolan, Editor-At-Large, Finance and Markets As has often been the case over the past two years, Nvidia's forecast-beating results have helped calm a tech sector nervous about bubble-like AI valuations. Meanwhile, hopes of another U.S. interest rate cut this year have all but disappeared. Demand for Nvidia'​s chips was never the root of the AI bubble worries, which are mostly focussed on whether the gigantic AI infrastructure spend wi ...