By Arathy Somasekhar (Reuters) -Oil prices fell on Thursday despite forecasts for a steeper rise in energy demand, with crude turning negative on fears that the U.S. Federal Reserve will hike rates more aggressively than expected to fight inflation. After rising more than 1% in early trade, Brent crude futures slipped 27 cents, or 0.3% to $91.26 a barrel by 1347 p.m. ET (1847 GMT). U.S. Texas Intermediate crude fell 12 cents, or 0.1% to $89.54 a barrel. After U.S. inflation data came in on Thursday at its hottest in 40 years, St. Louis Federal Reserve Bank President James Bullard said he wants…