Where is the relativity principle?

In summary, the conversation discusses the relationship between modern approaches and gravity. LQG and strings are both believed to contain gravity, with LQG being a quantization of geometry and strings having a spin 2 particle. The concept of locality and the relativity principle are also mentioned as key factors in understanding gravity.
  • #1
arivero
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At a naive level, one really has problems to understand the relationship between all these modern approaches and gravity.

LQG is supposed to contain gravity because it is a quantization of geometry a-la-Asthekar. Strings are supoosed to contain gravity because there is a spin 2 particle. It sounds me as to say that electromagnetism contains Newton gravity because it contains a 1/r potential.

Which one expects is to be told how the relativity principle appears in these theories. That is gravity: the postulate that every reference frame is locally equivalent to a minkowskian one. In usual GR, "locally" means "infinitesimally". Here it could have another meaning, to be quantized, restricted, patched, who know. But it should be clearly related to the GR principle.
 
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  • #2
Originally posted by arivero
Strings are supoosed to contain gravity because there is a spin 2 particle.
are you reffering to graviton?
 
  • #3
Hmm yes I am. Or, if you prefer, to a particle which induces atractive forces between equal charges. Strings are supposed to contain such beast, aren't it?
 

1. What is the relativity principle?

The relativity principle is a fundamental principle of physics that states that the laws of physics should be the same for all observers in uniform motion. This means that the laws of physics should be the same regardless of an observer's relative velocity or position.

2. Who proposed the relativity principle?

The relativity principle was first proposed by Galileo Galilei in the 16th century. Later, it was further developed and expanded upon by Albert Einstein in his theory of special relativity in the early 20th century.

3. How does the relativity principle apply to space and time?

The relativity principle states that the laws of physics should be the same for all observers in uniform motion, including the laws governing space and time. This means that measurements of space and time can vary between different observers depending on their relative velocity or position.

4. Why is the relativity principle important in physics?

The relativity principle is important because it helps us understand the fundamental nature of space, time, and motion. It also plays a crucial role in modern physics, particularly in the development of Einstein's theory of general relativity and our understanding of the universe.

5. Can the relativity principle be tested?

Yes, the relativity principle has been extensively tested and has been found to hold true in all cases so far. Experiments and observations have consistently shown that the laws of physics are the same for all observers in uniform motion, confirming the validity of the relativity principle.

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