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Results tagged with beyond-the-standard-model
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user 10833
Use this tag for questions beyond the standard laws of physics (General Relativity and the Standard Model) if a more specific tag, like "string-theory", "loop-quantum-gravity", "supersymmetry", etc. do not apply.
12
votes
Why do we need complex representations in Grand Unified Theories?
This can be explained by thinking about the coupling of fermions to the $SU(2)$ weak gauge field. Let's recap what we know
Weyl fermions necessarily appear in two complex representations of the Lore …
- 7,994
7
votes
Fifth force in string theory
This is a good question. At a simplified level, string theory introduces a large number of new scalar fields associated with the shape and size of extra dimensions. These so-called moduli fields can b …
- 7,994
5
votes
Accepted
String Theory: Why should(n't) the string snap?
You're right to think that the open string content of a theory is essentially a choice. The strings are the fundamental constituents, and different theories have different building blocks, by definiti …
- 7,994
2
votes
Accepted
Why is a tensor times its dual a derivative?
In gauge theory, we usually consider the gauge field $A^\mu$ to be fundamental. The field strength is defined as
$$F_{\mu\nu}=\partial_{[\mu}A_{\nu]}-[A_\mu,A_\nu]$$
Hopefully it is now clear that
…
- 7,994