Subject: 2nd law of thermodynamics and cosmology

I wonder if I can pose a question to you? The claim has been made that
the 2nd law of thermodynamics provides proof that the universe had a
cause outside of itself (a variation of the Kalam cosmology argument). 
Is this claim supported  by mainstream astronomy? It's my 
understanding that the most widely accepted theory is the "oscillating 
universe" or multiverse theory, and that this is associated with the 
"superstring" theory. Is this true, or am I completely off center?
Could you please provide me with references in the scientific 
literature and any other resources (preferably those accessable to the 
layman) that provide further information on the subject currently in 
line with mainstream scientific belief?
Thank you very much!

Re: 2nd law of thermodynamics and cosmology