Ways to get rid of non-chiral matter

[mainaim]

Hi everyone,
I was wondering what ways there are to get rid of non-chiral matter in string theory. If you have a D7 brane in a type IIB orientifold with a flux on its world-volume you always get non-chiral matter. (In the IIA dual you have the brane and its image lying on top of each other in one torus if you have a toroidal compactification).
What ways are there to make it massive or what other possibilites exist? Or would it be possible to still make it chiral in some way by an appropriate choice of groups or fluxes?
Even a partial response is appreciated!

 

[AndyW]

Hello,

Thank you for your question. The issue of non-chiral matter in string theory is a complex and ongoing research topic. There are a few different approaches that have been proposed to address this issue.

One approach is to use flux compactifications, as you mentioned in your post. By introducing fluxes on the D7 brane world-volume, it is possible to generate a non-zero mass for the non-chiral matter. This has been studied extensively in the literature and has been shown to work in certain cases.

Another approach is to use geometric engineering, where the D7 brane is wrapped on a particular geometry that can break certain symmetries and produce chiral matter. This has also been explored in various models, but it can be difficult to find a suitable geometry that produces the desired chiral matter.

In addition, there have been proposals to use non-perturbative effects, such as gaugino condensation, to generate a mass for the non-chiral matter. However, this approach is still under investigation and its effectiveness is not yet fully understood.

As for the possibility of making the non-chiral matter chiral through the choice of groups or fluxes, there have been some attempts at this, but it is a challenging problem and there is no definitive solution yet.

In summary, there are several potential ways to address the issue of non-chiral matter in string theory, but it is still an active area of research and there is no consensus on a definitive solution. I hope this response was helpful and I encourage you to continue exploring this topic.