If you were to take into account that the universe could very well be a small part of a much larger 'multiverse', then it would make sense why the expansion of the universe is accelerating. In such circumstances a tug o' war would be inevitable.
If this superstring theory has any truth, big bangs come in many shapes and sizes and are constantly taking place in multiple dimensions.
Read what Nima Arkani-Hamed has to say about it. He might very well have the answers to your questions.
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