Your thoughts on reality, dark energy, and the expansion of the universe. -

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Romper Stomper

Spookbuster
kiwifarms.net
So i've done a lot of reading and there's one thing that really sticks out to me. One of the most widely accepted theories is that dark energy will continue to accelerate the expansion of the universe itself until that expansion moves faster than the speed of light. But some other things that i've read about say that empty space itself is made of particles, and the general assumption is that no particle that exists can move faster than light. So at the very end of the universe during heat death, space, made of particles, would be expanding so fast that particles like photons could never have hope of interacting with each other, even though that violates the very core of the theory of relativity. It's just really confusing to me, and I was wondering, what were your thoughts?

tl;dr how can space expand faster than the speed of light if thats the fastest anything can move.
 

Gustav Schuchardt

Local Moderator
True & Honest Fan
kiwifarms.net
tl;dr how can space expand faster than the speed of light if thats the fastest anything can move.

Space can expand faster than the speed of light - see inflation, the Alcubierre warp drive and the Big Rip.

If there's a cosmological constant pushing space apart you could theoretically get a Big Rip.

The speed of light is only a speed limit for particles with mass below that speed, not for spacetime. Or for photons actually, which are massless spend their whole lifetime at the speed of light.
 

mr.moon1488

True & Honest Fan
kiwifarms.net
Space can expand faster than the speed of light - see inflation, the Alcubierre warp drive and the Big Rip.

If there's a cosmological constant pushing space apart you could theoretically get a Big Rip.

The speed of light is only a speed limit for particles with mass below that speed, not for spacetime. Or for photons actually, which are massless spend their whole lifetime at the speed of light.
I've always found the "photons don't have mass, because they don't have rest mass, because they never come to rest" argument to be somewhat dubious. Firstly, an origin point for a photon can be observed, and an origin point implies a rest point. For instance, when a U235 atom is struck by a stray neutron, the U235 atom will break down, and release energy in the form of a photon. One could argue that the "rest mass" for a photon is just any matter. Secondly, a photon is effected by gravity, and finally, a photon can transmit kenitic energy.
 

Romper Stomper

Spookbuster
kiwifarms.net
@mr.moon1488
That's just what really gets me about the whole thing. Energy and matter are considered to be two sides of the same thing, and while matter would take an infinite amount of energy to be accelerated to the speed of light, matter *can* be converted into energy and travel at that speed. The thing that I keep thinking is that the fabric of space must have an innate amount of energy that powers its acceleration, and that energy powering it has the same speed limit as traditional energy. But everything I read says that the universe would just keep expanding faster and faster, just because. No reason why, but just cuz.
 

Y2K Baby

The Codex of Ultimate Wisdom???
True & Honest Fan
kiwifarms.net
@mr.moon1488
That's just what really gets me about the whole thing. Energy and matter are considered to be two sides of the same thing, and while matter would take an infinite amount of energy to be accelerated to the speed of light, matter *can* be converted into energy and travel at that speed. The thing that I keep thinking is that the fabric of space must have an innate amount of energy that powers its acceleration, and that energy powering it has the same speed limit as traditional energy. But everything I read says that the universe would just keep expanding faster and faster, just because. No reason why, but just cuz.
Go to school.
 

mr.moon1488

True & Honest Fan
kiwifarms.net
Go to school.
I tried, but I got arrested by the LBI.
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