Brane Cosmology

Dec 2, 2018 ... What existed before the big bang? Did something have to be be there in order to go boom? – Ethan, 10, Sydney. Ethan, what a question. To ... Until 14 billion years ago, the universe was contracting. It reached a minimum size at the Big Bang (which we call t = 0) and has been expanding ever since. ( ... Apr 18, 2019 ... Xingang Chen is one of the authors of a new study that examines what the universe looked like before the Big Bang. Some studies suggest that the state of the universe before the Big Bang is unknown and requires assumptions, while other studies propose scenarios like ... Events before the Big Bang, are simply not defined, because there's no way one could measure what happened at them. This kind of beginning to the universe, and ... ... big bang cannot tell us what happened before 10-43 seconds, or for that matter, what happened before zero seconds—or why the laws of physics are what they are. May 22, 2001 ... Review of various imaginative theories offered by cosmologists to explain what might have existed before birth of universe; drawings (M) May 31, 2024 ... No experiment has yet been devised that can observe what happened before inflation. However, mathematicians can sketch out some possible ... Aug 27, 2014 ... Inflation certainly occurs after the cosmological singularity, but before several important events of the Big Bang. In other words, the ... What was before the Big Bang? And how do we know it happened? Let BBC Science Focus give you the low down on the birth of The Universe.