Well, M-Theory proposes the possible existence of multi-dimensional membranes which interacted, causing our universe.

As for Loop Quantum Gravity, Abhay Ashtekar and Martin Bojowald have released papers stating that according to loop quantum gravity, the singularity of the Big Bang is avoided. What they found was a prior collapsing universe. Since gravity becomes repulsive near Planck density according to their simulations, this resulted in a "Big Bounce" and the birth of our current universe. These topics are an active research in loop quantum cosmology.

By the way, I wasn't implying that you were asking about the fine-tuning problem, that was bad wording on my part. I was just referring to the fine tuning problem in of itself. I agree with you regarding the lack of a need for a cause.