If infinite parallel universes exist…
“I would be very interested in a post about quantum fields. Are they generally/universally believed to be real and the most fundamental aspect of our universe or just a mathematical construct? I’ve read that there are 24 fundamental quantum fields: 12 fields for fermions and 12 for bosons. But I’ve also read about quantum fields for atoms, molecules, etc. How does that work? Does everything emerge from these 24 fields and their interactions?”
When you think about the Universe, you probably think about it in a very particular fashion. There’s spacetime: the backdrop upon which the matter in the Universe exists, and then there are particles and antiparticles, which make up everything we can conceive of in the cosmos. Only, the quantum nature of reality is very different from this intuitive picture, and quantum field theory goes a few steps farther than even the unintuitive pictures we have in our heads. What if Heisenberg uncertainty, the Pauli exclusion principle, wave-particle duality and more were all just manifestations of something very basic: quantum fields themselves?
“Our Universe is an intricate, amazing place, and yet our greatest hopes of a unified theory — a theory of everything — seek to decrease the number of fundamental constants we need. In reality, though, the more we learn about the Universe, the more parameters we’re learning it takes to fully describe it. It’s important to recognize where we are and what it takes, today, to describe the entirety of what’s known.
But we still don’t know everything, and so it’s also important to keep searching for a more complete paradigm. If we’re successful, it will give us absolutely everything the Universe has in it, including solutions to our current mysteries. The hope of many, but not a requirement, is that the Universe will wind up being simpler than we currently know. Right now, unfortunately, anything simpler than what’s been put forth here is too simple to work. Our Universe may not be elegant, after all.”
Think about everything that exists in our Universe. We have the four fundamental forces: gravity, electromagnetism, and the strong and weak nuclear forces. We have all the particles and antiparticles of the Standard Model; we have the bosons; we have the ways that particle behavior changes dependent on energy. We have hundreds of known composite particles and the ways that they interact, couple and decay. For everything that’s known, there are at least 26 fundamental constants required to explain the Universe on top of the laws of physics themselves, and still, they don’t give us everything.
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“But for the 25,000+ other satellites in low-Earth orbit, there is no controlled re-entry coming. Earth’s atmosphere will take them down, extending far beyond the artificial edge of space, or Kármán line, that we typically draw. If we were to cease launching satellites today, then in under a century, there would be no remaining trace of humanity’s presence in low-Earth orbit.
Sputnik 1 was launched in 1957, and just three months later, it spontaneously de-orbited and fell back to Earth. The particles from our atmosphere rise far above any artificial line we’ve drawn, affecting all of our Earth-orbiting satellites. The farther your perihelion is, the longer you can remain up there, but the harder it becomes to send-and-receive signals from here on the surface. Until we have a fuel-free technology to passively boost our satellites to keep them in a more stable orbit, Earth’s atmosphere will continue to be the most destructive force to humanity’s presence in space.”
On October 4th, 1957, the world changed forever with the launch of Sputnik 1. One of the common questions that astronomers get asked is whether we can still see it or not. The answer surprises most people: not only can’t we see it, but it crashed back to Earth just 3 months after launch, before the United States even launched its first successful satellite: Explorer 1. Moreover, the reason this happened wasn’t due to any technical flaw or malfunction, but due to the simple physical fact that Earth’s atmosphere doesn’t end where we erroneously and arbitrarily define the “edge of space” to be. Instead, atmospheric drag affects all satellites in low-Earth orbit, and will eventually take down everything from the International Space Station to the Hubble Space Telescope.
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