A Crowded Multiverse?

Posted by on December 16th, 2009

In the latest Scientific American theoretical physicists Alejandro Jenkins and Gilad Perez speculate that there might be a greater chance of life developing in other universes with different physical laws and that our own may not be as finely tuned as once thought.

Our recent studies, however, suggest that some of these other universes—assuming they exist—may not be so inhospitable after all. Remarkably, we have found examples of alternative values of the fundamental constants, and thus of alternative sets of physical laws, that might still lead to very interesting worlds and perhaps to life. The basic idea is to change one aspect of the laws of nature and then make compensatory changes to other aspects.

This runs counter to the idea that life in our universe is unique because the chances of the local laws of physics allowing for it are so rare.

For example, if life really is possible in a weakless universe, then why does our own universe have a weak force at all? In fact, particle physicists consider the weak force in our universe to be, in a sense, not weak enough. Its observed value seems unnaturally strong within the Standard Model. (The leading explanation for this mystery requires the existence of new particles and forces that physicists hope to discover at the newly opened Large Hadron Collider at CERN near Geneva.)

It’s a very interesting read of you’re into that kind of thing…
Looking for Life in the Multiverse

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