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By definition, D(irichle)-branes are branes on which open strings end. Then how closed string theories IIA and IIB may contain D-branes? Or more precisely, why the branes appearing in closed string theories are still called D-branes?
Well, I never said that I know nothing about it. What I say is that I do not understand it sufficiently well, hoping that someone understands it better than I do.MTd2 said:Heh, guy that asked the question here, answered you there:
https://www.physicsforums.com/showpost.php?p=1351899&postcount=3
D-branes and closed strings are two fundamental objects in string theory. D-branes are extended objects that can have different dimensions, while closed strings are one-dimensional objects that are closed loops. They both play important roles in understanding the behavior of strings and the nature of the universe.
The main difference between D-branes and closed strings is their dimensionality. D-branes can have different dimensions, such as 0, 1, 2, or more, while closed strings are always one-dimensional. Additionally, D-branes have endpoints that are attached to them, while closed strings do not.
D-branes and closed strings can interact through the exchange of closed strings between them. This interaction is governed by the laws of string theory, and it plays a crucial role in understanding the dynamics of D-branes and their relationship to closed strings.
D-branes and closed strings are crucial in understanding the fundamental principles of string theory and how it relates to other theories in physics. They also play a key role in the study of black holes and the behavior of matter at the subatomic level.
In string theory, it is proposed that there are extra dimensions beyond the three spatial dimensions we experience in our daily lives. D-branes and closed strings provide a way to understand and visualize these extra dimensions, as D-branes can exist in different dimensions and closed strings can wrap around these dimensions.