Investors who hoped U.S. corporate earnings could dig stocks out of their deep hole may find themselves sorely disappointed. The outlook for corporate profits continues to deteriorate, and earnings growth is now unlikely to revive before the summer. Thanks to rapidly dimming forecasts for energy, materials, finance and technology sectors, year-over-year profit declines for Standard & Poor’s 500 companies are now expected until the second quarter of 2016 at the earliest, according to data from Thomson Reuters Proprietary Research.