Imaginary time can describe universe from "summary" of A Brief History of Time by Stephen W. Hawking
One might wonder how a concept as seemingly unanchored from reality as imaginary time could possibly have any relevance to the description of the universe. After all, imagination is usually associated with the realm of fiction and fantasy, rather than the cold, hard truths of science. However, in the realm of theoretical physics, where the boundaries between reality and speculation blur, imaginary time plays a crucial role in helping us make sense of the universe. When we speak of time in the context of physics, we are not referring to the subjective experience of the passing of moments, but rather to a dimension that is intimately woven into the fabric of spacetime. However, the nature of time, particularly when it comes to the extreme conditions of the early universe or the vicinity of black holes, presents challenges that cannot be adequately addressed within the confines of traditional, real-valued time. Enter imaginary time. By allowing time to take on imaginary values, we effectively transform the familiar, linear flow of time into a multidimensional space that can be traversed in ways that are not possible in our everyday experience....
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