LONDON—Global stocks recovered some of their recent losses on Tuesday and government bond yields retreated as investors bought back into riskier assets ahead of the appearance of U.S. Federal Reserve Chair Jerome Powell before the Senate Banking Committee. Investors hope Powell will provide more clues to the timing of expected policy tightening when he appears before the committee, followed by a hearing with vice chair nominee Lael Brainard on Thursday. The small rise for shares in Tuesday’s early trading follows a week of hefty losses for stock markets after investors panicked about the prospect of faster monetary tightening in the United States and the impact of richly valued share prices that hit a series of record highs in 2021. But many analysts say that, while bond yields look set to remain higher than they did last year, a robust outlook for economic growth and corporate earnings will provide some support …