Singapore (Reuters) - In a matter of days, investor relief that the United States avoided default has been replaced by fears Europe's debt crisis is deepening and the world's biggest economy may be slipping back into recession. (http://feeds.feedburner.com/~ff/reuters/topNews?d=yIl2AUoC8zA) (http://feeds.feedburner.com/~ff/reuters/topNews?i=AU6-4Mpxu5A:lMLOkIkSDA0:V_sGLiPBpWU) (http://feeds.feedburner.com/~ff/reuters/topNews?i=AU6-4Mpxu5A:lMLOkIkSDA0:-BTjWOF_DHI) (http://feeds.feedburner.com/~r/reuters/topNews/~4/AU6-4Mpxu5A)