what i am mainly asking by this question is that were the laws of physics same when the universe has less entropy in the very beginning to right now when its has a lot more entropy
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According to Grand Unified Theory, in the very early universe, when everything was extremely hot, the forces (other than gravity) were all one force and weren’t distinguishable from each other. Then as things cooled down, the forces started to separate into the strong, weak, and electromagnetic forces we’re aware of today. This happened very very quickly, though, so it was only true for a ridiculously small percentage of the lifetime of the universe. I can’t really think of an ELI5 way to explain why that was the case though lol. At a high level, it’s due to certain symmetries getting spontaneously broken, but that’s already very not ELI5.
As for whether the laws of physics will stay the same when the heat death of the universe occurs, to my knowledge the answer to that based on our current theories is yes, though on cosmological scales it’s really difficult to say that our theories will hold up when we’ve only been able to observe the universe for such a brief blip of its existence.
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