Wall Street indexes opened slightly lower on Tuesday, with Nvidia weighing on the S&P 500 and Nasdaq after the UK ordered an in-depth probe into the chipmaker’s planned acquisition of Arm. The Dow Jones Industrial Average fell 11.27 points, or 0.03 percent, at the open to 36,076.18. The S&P 500 opened lower by 3.38 points, or 0.07 percent, at 4,679.42. The Nasdaq Composite dropped 13.52 points, or 0.09 percent, to 15,840.32 at the opening bell.