High School Gravity-like Force: Is Another Force Weaker Than Gravity?

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The discussion centers on whether a force similar to gravity could exist and if it would necessarily be weaker than gravity. Participants argue that the lack of observation of such a force suggests it must be weaker than gravity, given that gravitational effects are consistently observed. Theoretical skepticism is also highlighted, questioning how one could detect a force that couples to the stress-energy tensor like gravity does. The consensus leans towards the idea that if another force exists, it remains undetected due to its relative weakness. Overall, the conversation emphasizes the challenges in identifying any force that could supplement gravity.
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Is it true that if there was another force similar to gravity (dependent on the stress-energy tensor) then it would have to be weaker than gravity? If so, why?
 
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Because we have not observed such a force which should supplement gravity.
 
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accdd said:
If so, why?
We have not observed any such thing,so if it exists it must be weaker than what we are able to observe, and we do observe gravitational effects.
(There are also some good theoretical reasons to be skeptical of the possibility).
 
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If it couples to the stress-energy tensor just as gravity does, how could you ever tell?
 
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Thread 'EPR revisited'

In an inertial frame of reference (IFR), there are two fixed points, A and B, which share an entangled state $$ \frac{1}{\sqrt{2}}(|0>_A|1>_B+|1>_A|0>_B) $$ At point A, a measurement is made. The state then collapses to $$ |a>_A|b>_B, \{a,b\}=\{0,1\} $$ We assume that A has the state ##|a>_A## and B has ##|b>_B## simultaneously, i.e., when their synchronized clocks both read time T However, in other inertial frames, due to the relativity of simultaneity, the moment when B has ##|b>_B##...
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