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The problem with bosonic strings is the fact that they contain a tachyon.
Why that is not a problem for the bosonic part of heterotic strings?
Why that is not a problem for the bosonic part of heterotic strings?
Heterotic strings are a type of theoretical particle that is proposed by string theory, which is a branch of theoretical physics that seeks to unify the four fundamental forces of nature. Heterotic strings are one-dimensional objects that vibrate at different frequencies and are believed to be the building blocks of all matter.
Heterotic strings are unique in that they have a combination of both closed and open strings, while other types of strings in string theory are either purely open or closed. This combination allows for the possibility of supersymmetry, which is a key aspect of heterotic string theory.
Supersymmetry is a theoretical concept that suggests that for every known particle, there exists a corresponding "superpartner" particle with different spin properties. In heterotic string theory, supersymmetry is necessary to maintain the mathematical consistency of the theory and to reconcile it with the principles of quantum mechanics and relativity.
There are two types of heterotic strings: the SO(32) heterotic string and the E8 x E8 heterotic string. These differ based on the symmetry group that the strings are based on, and they have different implications for the properties of the universe.
One of the main challenges in heterotic string theory is the issue of compactification, which involves explaining why the universe appears to have only three dimensions of space and one dimension of time, despite string theory predicting the existence of extra dimensions. Currently, string theorists are exploring different ways to compactify the extra dimensions and make testable predictions to validate the theory.