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If there are 1 trillion planets in the universe (there are likely many more)
The physical Universe is eternal. Infinite series of Big Bangs to Big Crunches for the purpose of creating life forever.
a slowing expansion, or a retraction, but observation has shown that the expansion is, in fact, increasing in speed.
The increase in expansion rate is believed to be due to something called Dark Energy, a theorized form of energy that underlies all space
I'm actually aware Big Crunch isn't currently the popular model. I believe it to be the likely outcome regardless
What I am thinking is that we don't fully understand the mechanism of dark energy and that sometime in the Universe's future we will see the expansion slow and contraction start to occur via that underlying energy. Again…just my thoughts. I'm no physicist.
True, we don't know everything
ketsuko
flammadraco
reply to post by ketsuko
If what you say is true, then in the US, proper Christian Church's should picket the likes of Westboro Church and the nutter in Florida with placards that state "Not in Our Name" or phrases to that effect. Instead they do nothing.
Perhaps Christians need to differentiate themselves from groups such as these. If this was to happen then perhaps I would have more respect for your beliefs but until such time all I see with the Christian Church is hatred and yes certain sections do need to be regarded as "Hate Groups".
Christians denounce them all the time. You just aren't listening. For the most part, we are busy with our lives. Why is the only possible denunciation you will accept a noisy counter-protest? Is it not enough for nearly everyone you meet of every religious affiliation to say outright that they are disgusting?
Apparently not. *sigh*
We must burn down their meeting places or something or else it's just not legitimate. Of course, that makes us no better than they are ...
I'm personally Agnostic and this does not mean I've not made my mind up, it means I believe in God, I also believe Jesus existed, however i do not believe in any organised religion as they were all created by man
I'm sure that you see the irony in your wanting a certain outcome (a cyclical universe,) in order to bolster a belief that you have, and you then rejecting the evidence that exists which falsifies that outcome, stating that "when we know more, the theory that supports me will somehow be valid."
Well, I think that you have the first article backward --
An alternative value of w might indicate that dark energy hasn’t been constant over time, but varies—an idea called quintessence.
How can you say I am rejecting the evidence when I acknowledge the science community currently doesn't favor a cyclic Universe?
I'm actually aware Big Crunch isn't currently the popular model. I believe it to be the likely outcome regardless
You're telling me you and the others in this thread wouldn't be arguing for or against the nature of the Universe with the underlying intent of bolstering their religious belief.
while I came to a deistic (eventually Christian) position through physics and cosmology, I don't use one to promote the other. Science is what it is, and faith is what it is.
I took the quintessence bit and found the 3rd article I linked which has one of the founders of Inflation Theory talking about quintessence and how the fate of the Universe isn't necessarily perpetual expansion since quintessence can repel or attract.
Both subtypes of quintessence can be modeled using a variety of different types of "scalar fields", but not any fields that are part of the current standard model of particle physics.
What about the case w (is less than) 1? In that scenario, acceleration increases very rapidly, leading to what is called the "big rip", in which not only the universe itself expands, but in the distant future even stars and eventually subatomic particles are torn apart. This would correspond to yet another type of quintessence, called "phantom energy". But that's a story for another time
So why call me out for doing it about a cyclic universe?
adjensen
reply to post by Lucid Lunacy
Well, what I got out of it is that their theory was that there was once a time when quintessence was not repellant, though it is now. I don't see any mechanism by which it would become attractive, but I suppose it's possible.
"The cosmological constant is a very specific form of energy, a vacuum energy," Steinhardt said. "Quintessence encompasses a wide class of possibilities. It is a dynamic, time-evolving and spatially dependent form of energy with negative pressure sufficient to drive the accelerating expansion."
Vacuum energy is the potential energy in an absolute vacuum, devoid of matter or radiation. Think of a chimney sucking air from the living room; that's the universe's matter expanding into the great unknown. Quintessence is a quantum field with both kinetic and potential energy. Depending on the ratio of the two energies and the pressure they exert, quintessence can either attract or repel.
For quintessence, the quantum field would have a very long wavelength, about the size of the universe. Its kinetic energy depends on the rate of oscillations in the field strength; its potential energy depends on the interaction of the field with matter. The more kinetic energy, the more positive the pressure - which isn't so likely for a universe-long wavelength. So for now, potential energy and negative pressure dominates. Hence, quintessence is a repulsive force.
This can change, Steinhardt says. Quintessence interacts with matter and evolves over time. Quintessence can also decay into new forms of hot matter or radiation. So we are not necessarily doomed to a universe that expands forever, stretching every atom from here to infinity.
That seems obvious -- because, as of now, the scientific evidence supports a non-cyclical universe.
while I came to a deistic (eventually Christian) position through physics and cosmology