Is Our Universe a Result of a Multiverse Collision?

by Irma Arkus

According to Anthony Aguirre, a collision between our universe and an alien one, decimating everything in its path, may have already happened.

Apparently, “there are tantalizing hints that our universe has already survived such a collision—and bears the scars to prove it.” Not only are initial theories prompting scientists to think differently about our universe, but about the concpet of multiverses as well.

Our universe, for example, is superbly uniform and smooth. Physicists say that the reason for such uniformity is fast expansion at high rate. Andrei Linde and Alex Vilenkin at Tufts University proposed that such expansion does not occur only once, but could potentially reoccur. Every such event would cause a bubbling of yet another space and time bubble, and this continuous bubbling would lead to ongoing creation of multiverses.

But more importantly, these would, however unlikely, run into other bubbles and collide with them.

The question posed then is whether our universe would survive such collision, or whether such an event already occured?

According to Vilenkin, “when you think about it, in an infinite multi­verse, with bubbles being formed all the time, sooner or later a bubble will form near the boundary of our bubble, and we will be hit,” Vilenkin says. “There’s the possibility of a benign collision when the cosmological characteristics of the alien bubble are similar to ours, so that it doesn’t destroy us but recedes away.”

But what are these scars? They are everywhere, physicists posit, and since the idea is relatively novel, they are still uncertain as to what it all means.

Microwave radiation for example, shows variable hot and cold spots, which may imply scars of an earlier collision.

Furthermore, New York University physicsist Thomas Levi, doing work on string theory, has also located a spot in the universe that defies explanations. Except that the explanation of a multiverse, and more specifically, a multiverse collision may lie at the heart of it. [Discover]