According to quantum mechanics, what happened before the Big Bang?

Answer 1

It is unknown.

Although it's not a very good response, it's the only one available.

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Answer 2

Present understanding of quantum mechanics leaves much to be desired in explaining the events leading up to the Big Bang; conventional notions of time and causality break down at the Big Bang's singularity, making it challenging to apply quantum principles to that point in the history of the universe; some theoretical approaches, such as loop quantum cosmology or specific multiverse theories, suggest alternative models to describe the pre-Big Bang era, but these theories remain theoretical and unsupported by empirical data.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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