Johannes Eisele/AFP via Getty ImagesUBS says a looser monetary policy from the Fed would fuel a stock market bubble. Six of the seven components of a market bubble are present, UBS said.UBS sees a 35% chance of a bubble forming in 2025, and highlights 5 stocks to buy to hedge risks.A laid back US central bank is the missing ingredient for a stock market bubble, according to analysts at UBS.Strategists led by Andrew Garthwaite of UBS Investment Bank said that of the seven conditions required for a stock market bubble to form, six have already been met.Those six thing include the end of a structural bull market, profits that are under pressure, a loss of market breadth, a gap of 25 years from the previous bubble, participation among retail investors, and a prevailing sentiment among investors that "this time is different."The last remaining condition for a bubble is loose monetary policy, according to the note, and with the Federal Reserve keeping interest rates at restrictive levels after Wednesday's 25-basis point interest rate cut, that requirement doesn't look likely to be met soon.