String Theory

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String Theory and Loop Quantum Gravity

Loop quantum gravity is string theory’s biggest competitor. It gets less press than string theory, in part because it has a fundamentally more limited goal: a quantum theory of gravity. Loop quantum gravity [more…]

String Theory's Competition: What is Looping?

String theory's biggest competitor, loop quantum gravity's key insight is that you can describe space as a field;instead of a bunch of points, space is a bunch of lines. The [more…]

String Theory versus Loop Quantum Gravity

Loop quantum gravity makes some definite predictions, which may mean that it could be tested well before string theory can be. As string theory’s popularity is being brought into question, the amount of [more…]

Benefits and Flaws of Loop Quantum Gravity

As with string theory, loop quantum gravity is passionately embraced by some physicists and dismissed by others. The physicists who study it believe that the predictions [more…]

String Theory: Phantom Energy and Rogue Universes

In string theory, the assumption is that the separate, parallel universes don’t normally interact with each other, but some approaches over the years have called this into question. One of the most recent [more…]

String Theory: Parallel Universes and the Multiverse

In string theory, the multiverse is a theory in which our universe is not the only one; many universes exist parallel to each other. These distinct universes within the multiverse theory are called [more…]

String Theory: Level 1 Parallel Universes

In string theory, the idea of Level 1 parallel universes basically says that space is so big that the rules of probability imply that surely, somewhere else out there, are other planets exactly like Earth [more…]

String Theory: Plurality of Worlds in Early Astronomy

Before string theory was a theory, early astronomy provided some support for the existence of a plurality of worlds, a view that was so controversial that it contributed to at least one man’s death. These [more…]

String Theory: Level 2 Parallel Universes

In the string theory of a Level 2 parallel universe, regions of space are continuing to undergo an inflation phase. Because of the continuing inflationary phase in these universes, space between us and [more…]

String Theory: Chaotic Inflation and Eternal Inflation

The theories of eternal inflation and chaotic inflation in string theory can be quite confusing. Most people, even physicists, use them fairly interchangeably. This is an excellent example of how concepts [more…]

String Theory: Level 3 Parallel Universes

Of the four types of universes, Level 3 parallel universes have the least to do with string theory directly. A Level 3 parallel universe is a consequence of the many worlds interpretation [more…]

String Theory: Alternate History in Many Worlds Interpretation

Level 3 universes have the least to do with string theory, but of all the types of parallel universes, Level 3 universes have most captured the imagination of popular culture, spawning their own genre [more…]

String Theory: Level 4 Parallel Universes

In string theory, a Level 4 parallel universe is the strangest place (and most controversial prediction) of all, because it would follow fundamentally different mathematical laws of nature than our universe [more…]

String Theory: Accessing Other Universes

Is there any way to reach the four types of parallel universes in string theory? Realistically, the answer is probably “No,” but that’s not the most interesting option. Theoretically, there are ways that [more…]

String Theory: Travel between Parallel Universes with Wormholes

Even before string theory, the idea existed that the geometry of the universe would allow for shorter paths between points. In fiction, this can be seen in stories such as Lewis Carroll’s [more…]

String Theory: Access Parallel Universes with Quantum Tunneling

In string theory, one process of getting from one universe to another would be to use the property of quantum tunneling,which is where a particle is allowed to “jump” from one location to another across [more…]

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