Is dark matter another dimension?

Originally Answered: Could dark matter and dark energy come from another dimension or another universe? Absolutely! They could be part of their own mysterious existence in our universe, perhaps even a doorway to their universe.

What’s wrong with string theory?

The internal problems of the theory are even more serious after another decade of research. These include the complexity, ugliness and lack of explanatory power of models designed to connect string theory with known phenomena, as well as the continuing failure to come up with a consistent formulation of the theory.

What is the Kaluza-Klein theory?

In physics, Kaluza–Klein theory (KK theory) is a classical unified field theory of gravitation and electromagnetism built around the idea of a fifth dimension beyond the usual four of space and time and considered an important precursor to string theory. The five-dimensional theory developed in three steps.

What is the contribution of David Klein in physics?

Klein introduced the hypothesis that the fifth dimension was curled up and microscopic, to explain the cylinder condition. Klein suggested that the geometry of the extra fifth dimension could take the form of a circle, with the radius of 10−30 cm. Klein also made a contribution to the classical theory by providing a properly normalized 5D metric.

What is Kaluza’s cylinder condition?

Kaluza also introduced the “cylinder condition” hypothesis, that no component of the five-dimensional metric depends on the fifth dimension. Without this assumption, terms are introduced that involve derivatives of the fields with respect to the fifth coordinate.

What is the gravitational constant in the Kaluza theory?

where is the gravitational constant and is the permeability of free space. In the Kaluza theory, the gravitational constant can be understood as an electromagnetic coupling constant in the metric. There is also a stress–energy tensor for the scalar field.