/sci/ - Science & Math

If there are an infinite amount of "Nows" existing simultaneously, why are we experiencing this exact Now, continuously, in what we would describe as a chronological order?

Based on the theory that time is an illusion and that past, present and future exists simultaneously (that was Einstein right?).

A black hole is simply a region in space with an extremely dense set of matter in a small region causing a massive gravitational field. Due to the curvature of space-time (I believe quite simply GR solves this, and that gravity is the curvature of space-time), anti-particles first also gather and can annihilate their counters, or when particles pass the event horizon since black holes are at the maximal entropy state for their volume of space, they will emit black body radiation with a temperature that goes up as the black hole gets smaller. So the 2nd law of thermodynamics is conserved, matter is simple transformed into heat.

So I've been trying to wrap my head around the curvature of space time. Not necessarily the math or science of it, but the idea of it.

I was thinking about how, when you throw a ball, and see it follow a "curved" path, it is actually obeying Newton's first law and travelling in a straight line, but through curved space. It seems to follow a curved path, because the reflected photons that allow you to see it are travelling in a much more straight line path, giving you more of a traditional Newtonian 3D stage view of it's curved trajectory through spacetime.

I wondered for a moment why things can "fight" the curvature, rather than being stuck on it like rails. Why is it that your speed allows you fight the curvature of space? Then I realized this was a stupid question, because its not curved space, its curved space time.

Now I'm trying to figure out, why is it that if you, say, drop a ball, it seems to fall in a straight path? Just as the parabolic trajectory of a thrown ball highlights the curvature of space, shouldn't a dropped ball highlight the curvature as well?

part 2

time comes into play when you begin to play around with the idea of how gravity affects clocks. if you and i both had precise, accurate atomic clocks, and you stayed on a mountain for 10 years, and i stayed in the valley for 10 years, would the clocks read the same time at the end of the experiment? nope! they'd be different! not by much, but it'd be there alright. so now we can begin to see that gravity has an effect on time. this is when einstein started to realize that space and time were very closely related. you can't affect one without affecting the other. pic related, it explains what i just said; it's gravity warping the spacetime around it.

here's where i finally answer your question. you asked "how can there be no time before the big bang?" well... because space as we know it did not exist. therefore time (as we know it) didn't exist either. so here's your next question: "what caused there to be spacetime?" nobody really knows. quantum mechanics says there is no such thing as unoccupied space, so something had to exist beforehand. there's a few nobel prizes and few blowjobs from the pope to be given to the person who figures out the answer to that question.

hth

>>1316878
No force it's just that spacetime is curved there and the straight line is no longer straight. So the object still follows a straight line but if it is curved it seem like it's not moving straight.
Pic related.