Table of Contents
Who suggested string theory?
The key theorist behind these early models would probably be Gabriele Veneziano. The string theories turned out to be the wrong model for hadron physics, but were later adapted to their present role as a theory of all elementary particles by a number of theorists.
What is string theory?
In physics, string theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings. String theory describes how these strings propagate through space and interact with each other. Thus string theory is a theory of quantum gravity.
What is a string string theory?
How many dimensions are there in spacetime?
three dimensions
The world as we know it has three dimensions of space—length, width and depth—and one dimension of time.
What is the significance of de Sitter spacetime?
de Sitter spacetime is the maximally symmetric spacetime of constant positive curva- ture. It is a solution of the vacuum Einstein equations with a positive cosmological constant. It is directly relevant for observation, in two (as fas as we know unrelated!) ways.
Can space and time no longer be independent?
For this to be true, space and time can no longer be independent. Rather, they are “converted” into each other in such a way as to keep the speed of light constant for all observers.
Can time be separated from the three dimensions of space?
In the context of special relativity, time cannot be separated from the three dimensions of space, because the observed rate at which time passes for an object depends on the object’s velocity relative to the observer.
Can space and time be seen as components of a fabric?
Contrary to popular belief, he did not draw the conclusion that space and time could be seen as components of a single four-dimensional spacetime fabric.