GENEVA – The booming U.S. private equity market could be heading for a crash as interest rates rise and hedge funds, desperately seeking higher returns, pour money into the sector, the chief investment officer for the biggest pension fund in the United States warned on Wednesday. "The biggest one (asset bubble) I'm afraid of at the moment is private equity," Mark Anson, CIO for the California Public Employees' Retirement System (CalPERS), told the International Fund Management 2005 conference organised by ICBI. "The current overhang of leveraged buyouts committed but not invested is $182 billion (end-2003 figure). A lot of money...