Definition of light in string theory

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Light in string theory is defined as an excitation of a string, which manifests as both particle and wave properties in our universe. In Loop Quantum Gravity (LQG), light is viewed as the gauge field associated with Quantum Electrodynamics (QED), focusing primarily on the quantization of gravity. Causal Dynamical Triangulation (CDT) similarly emphasizes quantum gravity without addressing other fundamental interactions at this stage. Both LQG and CDT frameworks do not incorporate the full spectrum of particle interactions, concentrating instead on gravitational aspects. Understanding light's role in these theories highlights the intersection of quantum mechanics and gravitational phenomena.
dubmugga
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What is it ?

Is it an excitation of a string in an extra dimension causing an effect of particle and wave nature in our universe ?

What also it it's definition in LQG or CDT ?

:confused:
 
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If I can remember my string classes, the photon should be an vibration mode of the string as all other particles. In LQG I guess that it is simply the usual gauge field of QED as LQG only quantize gravity. This should be the case in CDT too. LQG and CDT only deal with quantum gravity, not the other interactions at this moment.
 

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