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abstraction > hypothesis > theory > unified theory > string theory > superstring theory > heterotic string theory

heterotic string theory
subject			fact

heterotic string theory	has definition Gross's version of string theory in which space-times of different dimensions are associated with the same closed loop.
	is a kind of superstring theory
theory	has validity correct or incorrect with caveats
	has author or reasearch group
	has domain a field of research
	has date or a range of dates for which the theory was active

Kinds of heterotic string theory :

• heterotic e-string theory (3 facts) (E₈ × E₈) - One of the five superstring theories; involves closed strings whose right-moving vibrations resemble those of the Type II string and whose left-moving vibrations involve those of the bosonic string. Differs in important but subtle ways from the Heterotic-O string theory.
• heterotic o-string theory (3 facts) (O(32)) - One of the five superstring theories; involves closed strings whose right-moving vibrations resemble those of the Type II string and whose left-moving vibrations involve those of the bosonic string. Differs in important but subtle ways from the Heterotic-E string theory.