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re: Dark matter and dark energy.
Posted on 3/11/17 at 11:33 am to Commander Data
Posted on 3/11/17 at 11:33 am to Commander Data
quote:
What do you think of the guys who believe that our big bang was just a collapsing four dimensional star into a black hole from a higher dimensional universe? The math checks out and it explains how the temperature of the universe has been a steady constant everywhere we look. This temperature constant is the biggest driving force for inflation theory by the way.
Actually, inflation theory explains the temperature constant we see everywhere we look in the Universe. Alan Guth developed the theory at Cornell in 1979.
From Wikipedia:
quote:
As a junior particle physicist, Guth developed the idea of cosmic inflation in 1979 at Cornell and gave his first seminar on the subject in January 1980. Moving on to Stanford University Guth formally proposed the idea of cosmic inflation in 1981, the idea that the nascent universe passed through a phase of exponential expansion that was driven by a positive vacuum energy density (negative vacuum pressure). The results of the WMAP mission in 2006 made the case for cosmic inflation very compelling.
quote:
I do find these unorthodox theories interesting and you are right in that we will never advance our understanding if we aren't able to think outside the box.
Unorthodox theories become orthodox very quickly when they stand up to challenges in the scientific community. Of course, the term orthodox doesn't mean the same as it does in religion. Every theory, concept, hypothesis and even every observation remains eternally subject to challenge in science.
I think that's why so many lay people have an aversion to science. They want absolute answers to their questions and science says, "Well, according to the evidence..." That seems to put a lot of people off. It seems to make them regard science as uncertain. That's most unfortunate. They're missing out on so much knowledge.
1
Posted on 3/11/17 at 11:58 am to Kentucker
quote:
Actually, inflation theory explains the temperature constant we see everywhere we look in the Universe. Alan Guth developed the theory at Cornell in 1979.
That is what I was trying to say though I could have communicated it better. I understand that the theory offers a great explanation of the temperature constant, it's just that my mind struggles with anything that breaks the laws of Einstein's physics. I haven't tried to find competing theories on the subject if there are any.
Posted on 3/11/17 at 6:50 pm to Commander Data
Hey, we all struggle with anything that isn't intuitive. We evolved on this planet and experienced only classical physics growing up.
Nearly everything being theorized these days is strongly counter-intuitive. Quantum mechanics, string theory, heck, even Einstein's relativity is very difficult to understand. Analogies to everyday situations help, of course, but not everything can be compared to something we experience.
Quantum physics is just stupidly weird! And when we try to imagine what might be outside our Universe most of us shake our heads in befuddlement.
I think the "many minds" approach is best. The more people who are involved in science, the faster we will learn and progress.
Is it our destiny, our purpose to understand that from which we came? Yes and it's also our purpose to understand where we're going. The sooner the better, IMO.
Nearly everything being theorized these days is strongly counter-intuitive. Quantum mechanics, string theory, heck, even Einstein's relativity is very difficult to understand. Analogies to everyday situations help, of course, but not everything can be compared to something we experience.
Quantum physics is just stupidly weird! And when we try to imagine what might be outside our Universe most of us shake our heads in befuddlement.
I think the "many minds" approach is best. The more people who are involved in science, the faster we will learn and progress.
Is it our destiny, our purpose to understand that from which we came? Yes and it's also our purpose to understand where we're going. The sooner the better, IMO.
This post was edited on 3/11/17 at 6:51 pm
Posted on 3/12/17 at 6:46 am to Kentucker
quote:
it our destiny, our purpose to understand that from which we came? Yes and it's also our purpose to understand where we're going. The sooner the better, IMO.
Absolutely. Well put.
This post was edited on 3/12/17 at 8:43 am
Posted on 3/12/17 at 5:04 pm to Commander Data
Funny. I thought this was a thread about the NBA.
Posted on 3/19/17 at 5:31 am to Commander Data
Might dark matter actually be primordial black holes?
LINK
LINK
Posted on 3/19/17 at 7:26 pm to Commander Data
That link is a rather fanciful article. "Primordial" black holes insinuates that they have been around since the Big Bang. If we consider them the explanation for dark matter, we immediately run up against a major problem, dark energy.
As we understand black holes, not even energy can escape them. So, if dark energy accounts for 73% of the Universe, how did that happen? It should have been tied up in these primordial black holes as well. And, of course, there's also classic matter. If the Big Bang generated black holes then classic matter should have been affected, too.
The idea does provoke a strong question, however. Since we know that black holes originate because of the gravity associated with the collapse of big stars, the amount of gravity at the Big Bang must have been phenomenal. Every bit of the Universe was supposedly there at one point so why didn't everything just stay together in one humongous black hole?
Because inflation. According to Alan Guth's theory on the subject, inflation caused spacetime to come into existence at the Big Bang, thereby providing something for the rest of the Universe's components to explode into. Apparently, a black hole didn't have time to form after the Big Bang and not until after the war between matter and antimatter.
My personal thought on the subject is that just after the Big Bang happened, matter and antimatter annihiliated each other, creating dark matter and maybe dark energy, too. We know that this annihiliation wasn't 100% because we exist.
For some reason not all matter was annihiliated. Perhaps not all antimatter was converted to dark matter, either. There may well be a part of the extant Universe that is made up of just antimatter. Some scientists are looking for it but with no luck so far.
As we understand black holes, not even energy can escape them. So, if dark energy accounts for 73% of the Universe, how did that happen? It should have been tied up in these primordial black holes as well. And, of course, there's also classic matter. If the Big Bang generated black holes then classic matter should have been affected, too.
The idea does provoke a strong question, however. Since we know that black holes originate because of the gravity associated with the collapse of big stars, the amount of gravity at the Big Bang must have been phenomenal. Every bit of the Universe was supposedly there at one point so why didn't everything just stay together in one humongous black hole?
Because inflation. According to Alan Guth's theory on the subject, inflation caused spacetime to come into existence at the Big Bang, thereby providing something for the rest of the Universe's components to explode into. Apparently, a black hole didn't have time to form after the Big Bang and not until after the war between matter and antimatter.
My personal thought on the subject is that just after the Big Bang happened, matter and antimatter annihiliated each other, creating dark matter and maybe dark energy, too. We know that this annihiliation wasn't 100% because we exist.
For some reason not all matter was annihiliated. Perhaps not all antimatter was converted to dark matter, either. There may well be a part of the extant Universe that is made up of just antimatter. Some scientists are looking for it but with no luck so far.
This post was edited on 3/19/17 at 10:43 pm
Posted on 3/20/17 at 3:45 am to Kentucker
Absolutely. Sometimes physicists really reach with their theories. I doubt this one got much consideration from the community.
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