B Is Gravity Emergent? Answers to Pre-Big Bang Questions

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The discussion centers on the relationship between gravity and mass, particularly in the context of the pre-Big Bang era. It is argued that gravity existed before mass, but the question of which came first is deemed ambiguous and poorly defined. Gravity can exist independently of mass, as it can also arise from other sources like radiation or the Cosmological Constant. Participants are encouraged to base their discussions on valid references rather than personal speculations. Ultimately, the thread is closed due to the lack of clarity in the original question.
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I thing by my logic that gravity must have been at the pre bang stage, but then what did came first gravity or mass?
 
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The egg came first. Definitely, the egg...
 
wolram said:
I thing by my logic that gravity must have been at the pre bang stage, but then what did came first gravity or mass?
Gravity curves spacetime. It doesn't require that mass exists. Mass is one possible source of gravity, others are e.g. radiation or the Cosmological Constant.
So from this it seems the question "what did came first gravity or mass?" doesn't make sense.
 
wolram said:
I thing by my logic that gravity must have been at the pre bang stage

Personal speculations are not allowed here. Discussions should be based on valid references, not your "logic".

wolram said:
what did came first gravity or mass?

This question is not well-defined since both "gravity" and "mass" are ambiguous terms. I suggest that you consult some references and start a new thread with a better defined question that has a better basis. This thread is closed.
 
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https://en.wikipedia.org/wiki/Recombination_(cosmology) Was a matter density right after the decoupling low enough to consider the vacuum as the actual vacuum, and not the medium through which the light propagates with the speed lower than ##({\epsilon_0\mu_0})^{-1/2}##? I'm asking this in context of the calculation of the observable universe radius, where the time integral of the inverse of the scale factor is multiplied by the constant speed of light ##c##.
Why was the Hubble constant assumed to be decreasing and slowing down (decelerating) the expansion rate of the Universe, while at the same time Dark Energy is presumably accelerating the expansion? And to thicken the plot. recent news from NASA indicates that the Hubble constant is now increasing. Can you clarify this enigma? Also., if the Hubble constant eventually decreases, why is there a lower limit to its value?

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