Definition of light in string theory

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  • #1
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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  • #2
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.
 
  • #3


In string theory, light is defined as an excitation of a string in an extra dimension. This means that as the string vibrates in this extra dimension, it creates a ripple or wave that we perceive as light in our three-dimensional universe. This excitation can also manifest as a particle, giving light both wave and particle-like properties.

In contrast, in loop quantum gravity (LQG) and causal dynamical triangulation (CDT), light is not defined as an excitation of a string in an extra dimension. Instead, it is described as a fundamental entity known as a quantum of space, which is the smallest unit of space that can exist in these theories. This quantum of space is thought to interact with other quantum units to create the fabric of our universe.

Overall, the definition of light in string theory differs from that in LQG and CDT, highlighting the different approaches and perspectives in these theories. However, all three theories strive to understand the fundamental nature of light and its role in the universe.
 

1. What is the definition of light in string theory?

In string theory, light is defined as a string that is in its ground state or lowest energy state. This means that it is vibrating with the smallest possible amount of energy, giving it the appearance of a particle of light.

2. How does string theory explain the properties of light?

According to string theory, the properties of light are a result of the vibrations and interactions of tiny, one-dimensional strings. These strings have different modes of vibration, which correspond to different particles and their properties, including photons which make up light.

3. Can light exist in string theory without strings?

No, in string theory, light is fundamentally composed of strings. Without strings, there would be no particles or forces, making the concept of light as we know it impossible.

4. How does string theory incorporate the speed of light?

String theory incorporates the speed of light as a natural consequence of its fundamental principles. The speed of light is the maximum speed at which strings can vibrate and interact, and it is also the speed at which information and energy can travel within the theory.

5. Is the concept of light the same in string theory as in traditional physics?

No, the concept of light in string theory differs from traditional physics in that it is not treated as a fundamental particle, but rather as a manifestation of the vibrations of strings. Additionally, string theory allows for the possibility of extra dimensions and different types of light-like particles, which are not accounted for in traditional physics.

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