Sensex closes 586 pts down, Nifty below 7,800: The slide in Asian markets and below-expected GDP data sobered investor sentiments in the Indian equities markets on Tuesday, leading benchmark BSE Sensex to close 586 points down. The Nifty closed more than 2 per cent down on Tuesday after HDFC Bank lowered its base rate by a hefty 35 basis points, sparking concerns if other lenders would follow suit, hurting margins in the sector.