It may be possible to glimpse before the supposed beginning of time into the universe prior to the Big Bang, researchers now say.
Unfortunately, any such picture will always be fuzzy at best due to a kind of “cosmic forgetfulness.”
The Big Bang is often thought as the start of everything, including time, making any questions about what happened during it or beforehand nonsensical. Recently scientists have instead suggested the Big Bang might have just been the explosive beginning of the current era of the universe, hinting at a mysterious past.
To see how far into history one might gaze, theoretical physicist Martin Bojowald at Pennsylvania State University ran calculations based on loop quantum gravity, one of a number of competing theories seeking to explain how the underlying structure of the universe works.
Past research suggested the Big Bang was preceded by infinite energies and space-time warping where existing scientific theories break down, making it impossible to peer beforehand. The new findings suggest that although the levels of energy and space-time warping before the Big Bang were both incredibly high, they were finite.
Scientists could spot clues in the present day of what the cosmos looked like previously. If evidence of the past persisted after the Big Bang, its influence could be spotted in astronomical observations and computational models, Bojowald explained.
However, Bojowald also figures some knowledge of the past was irrevocably lost. For instance, the sheer size of the present universe would suppress precise knowledge of how the universe changed in size before the Big Bang, he said.
Read the full article from Charles Q. Choi at Space.com.
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