Massive particles in D-brane models ?

In summary, the zero separation of parallel D-branes results in massless open string modes, while non-zero separation leads to these modes becoming massive due to the length of the strings. This is similar to the Higgs mechanism, where a scalar field's vev breaks gauge symmetry and gives mass to gauge bosons.
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Dilatino
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How does a zero separation of parallel D-branes give mass to the particles that correspond to strings stretched between them?

Is there a scalar field corresponding to the separation of the D-branes which takes the role of a higgs field, or how does it work?
 
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Parallel D-branes have modes that correspond to strings stretched between the branes.

At zero separation, these open string modes are massless, because the strings have zero length.

At non-zero separation, these modes become massive, because the strings have nonzero length (and the string tension is a constant).

This is directly analogous to the Higgs mechanism. In the worldvolume theory on the branes, it corresponds to breaking gauge symmetry due to a vev of a scalar field, and the gauge boson acquiring a mass.
 
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1. What are massive particles in D-brane models?

Massive particles are particles that have a non-zero rest mass. In D-brane models, these particles are associated with vibrations of the D-brane, which is a type of extended object in string theory.

2. How are massive particles described in D-brane models?

In D-brane models, massive particles are described as open strings that are attached to the D-brane and move within the extra dimensions of the model. The vibrational modes of these strings correspond to different types of particles with varying masses.

3. Can massive particles in D-brane models interact with each other?

Yes, massive particles in D-brane models can interact with each other through the exchange of closed strings. This interaction is described by the rules of string theory, which include the concept of string scattering amplitudes.

4. What is the significance of massive particles in D-brane models?

Massive particles in D-brane models play a crucial role in understanding the physics of our universe at a fundamental level. They provide a framework for studying the interactions between different types of particles and how they behave in the extra dimensions of the model.

5. Are all particles in D-brane models massive?

No, not all particles in D-brane models are massive. In fact, the model also includes massless particles, such as photons, which are associated with the open strings that are not attached to the D-brane. These massless particles are responsible for the forces between the massive particles.

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