- 3360 - PHYSICS - mysteries yet to be solved? Today, no physicist would dare assert that our physical knowledge of the universe is near completion. To the contrary, each new discovery seems to unlock a Pandora's box of even bigger, even deeper physics questions.
--------------------- 3360 - PHYSICS - mysteries yet to be solved?
- In 1900, the British physicist Lord Kelvin pronounced: "There is nothing new to be discovered in physics now. All that remains is more and more precise measurement."
Within three decades, quantum mechanics and Einstein's theory of relativity had revolutionized the field.
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- No matter how astrophysicists crunch the numbers, the universe simply doesn't add up. Even though gravity is pulling inward on space-time, the "fabric" of the universe, it keeps expanding outward faster and faster. The Universe expansion is accelerating!
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- To explain this astrophysicists have proposed an invisible agent that counteracts gravity by pushing space-time apart. They call it “dark energy“. In the most widely accepted model of dark energy, it is a "cosmological constant" which is an inherent property of space itself that has "negative pressure" driving space apart.
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- As space expands, more space is created, and with it, more dark energy. Based on the observed rate of expansion, scientists know that the sum of all the dark energy must make up more than 70 percent of the total mass-energy contents of the universe.
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- About 84 percent of the matter in the universe does not absorb or emit light. "Dark matter," cannot be seen directly, and it hasn't yet been detected by indirect means, either. Instead, dark matter's existence and properties are inferred from its gravitational effects on visible matter, radiation and the structure of the universe.
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- This shadowy dark matter substance is thought to pervade the outskirts of galaxies, and may be composed of "weakly interacting massive particles," or WIMPs. Worldwide, there are several detectors on the lookout for WIMPs, but so far, not one has been found.
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- Dark mater might form long, fine-grained streams throughout the universe, and that such streams might radiate out from Earth like hairs.
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- Entropy is the arrow of time? The fact that you can't un-break an egg is a common example of the law of increasing entropy. Time moves forward because a property of the universe called "entropy," roughly defined as the level of “disorder“, that only increases, and so there is no way to reverse a rise in entropy after it has occurred. You can’t unbreak an egg!
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- The fact that entropy increases is a matter of logic: There are more disordered arrangements of particles than there are ordered arrangements, and so as things change, they tend to fall into disarray. But the underlying question here is, why was entropy so low in the past? Why was the universe so ordered at its beginning, when a huge amount of energy was crammed together in a small amount of space?
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- Space-time might be "flat," rather than curved, and thus that it goes on forever. If so, then the region we can see (which we think of as "the universe") is just one patch in an infinitely large "quilted multiverse."
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- At the same time, the laws of quantum mechanics dictate that there are only a finite number of possible particle configurations within each cosmic patch (10^10^122 distinct possibilities).
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- With an infinite number of cosmic patches, the particle arrangements within them are forced to repeat, infinitely many times over. This means there are infinitely many parallel universes: cosmic patches exactly the same as ours as well as patches that differ by just one particle's position, patches that differ by two particles' positions, and so on down to patches that are totally different from ours.
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- Is there something wrong with this logic, or is its bizarre outcome true? And if it is true, how might we ever detect the presence of parallel universes? Why is there more matter than antimatter?
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- The question of why there is so much more matter than its oppositely-charged and oppositely-spinning twin, antimatter, is actually a question of why anything exists at all. One assumes the universe would treat matter and antimatter symmetrically, and thus that, at the moment of the Big Bang, equal amounts of matter and antimatter should have been produced.
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- But if that had happened, there would have been a total annihilation of both: Protons would have canceled with antiprotons, electrons with anti-electrons (positrons), neutrons with antineutrons, and so on, leaving behind a sea of photons in a matterless expanse.
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- For some reason, there was excess matter that didn't get annihilated, and here we are. We exist as leftover matter! For this, there is no accepted explanation. The most detailed test to date of the differences between matter and antimatter, announced in 2015, confirm they are mirror images of each other, providing exactly zero new paths toward understanding the mystery of why matter is far more common.
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- The fate of the universe strongly depends on a factor of unknown value: “Ω , a measure of the density of matter and energy throughout the cosmos. If density Ω is greater than 1, then space-time would be "closed" like the surface of an enormous sphere.
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- If there is no dark energy, such a universe would eventually stop expanding and would instead start contracting, eventually collapsing in on itself in an event dubbed the "Big Crunch."
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- If the universe is closed but there is dark energy, the spherical universe would expand forever.
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- Alternatively, if Ω is less than 1, then the geometry of space would be "open" like the surface of a saddle. In this case, its ultimate fate is the "Big Freeze" followed by the "Big Rip": first, the universe's outward acceleration would tear galaxies and stars apart, leaving all matter frigid and alone. Next, the acceleration would grow so strong that it would overwhelm the effects of the forces that hold atoms together, and everything would be wrenched apart.
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- If Ω = 1, the universe would be flat, extending like an infinite plane in all directions. If there is no dark energy, such a planar universe would expand forever but at a continually decelerating rate, approaching a standstill.
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- If there is dark energy, the flat universe ultimately would experience runaway expansion leading to the Big Rip.
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- In the strange realm of electrons, photons and the other fundamental particles, quantum mechanics is law. Particles don't behave like tiny balls, but rather like waves that are spread over a large area.
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- Each particle is described by a "wavefunction," or “probability distribution“, which tells what its location, velocity, and other properties are more likely to be, but not what those properties are.
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- The particle actually has a range of values for all the properties, until you experimentally measure one of them, its location, at which point the particle's wavefunction "collapses" and it adopts just one location.
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- But how and why does measuring a particle make its wavefunction collapse, producing the concrete reality that we perceive to exist? The issue, known as the measurement problem, may seem esoteric, but our understanding of what reality is, or if it exists at all, hinges upon the answer.
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- When physicists assume all the elementary particles are actually one-dimensional loops, or "strings," each of which vibrates at a different frequency, physics gets much easier. String theory allows physicists to reconcile the laws governing particles, called “quantum mechanics“, with the laws governing space-time, called “general relativity“, and to unify the four fundamental forces of nature into a single framework.
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- But the problem is, string theory can only work in a universe with 10 or 11 dimensions: three large spatial ones, six or seven compacted spatial ones, and a time dimension. The compacted spatial dimensions, as well as the vibrating strings themselves, are about a billionth of a trillionth of the size of an atomic nucleus.
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- There's no conceivable way to detect anything that small, and so there's no known way to experimentally validate or invalidate “string theory“.
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- The equations that describe weather and water, among other things, have not been solved. Physicists can't exactly solve the set of equations that describes the behavior of fluids, from water to air to all other liquids and gases.
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- In fact, it isn't known whether a general solution of the so-called “Navier-Stokes equations” even exists, or, if there is a solution, whether it describes fluids everywhere, or contains inherently unknowable points called “singularities“.
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- As a consequence, the nature of “chaos” is not well understood. Physicists and mathematicians wonder, is the weather merely difficult to predict, or inherently unpredictable? Does turbulence transcend mathematical description, or does it all make sense when you tackle it with the right math?
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- Do the universe's forces merge into one? The universe experiences four fundamental forces: electromagnetism, the strong nuclear force, the weak nuclear force and gravity. To date, physicists know that if you turn up the energy enough three of those forces "unify" and become a single force.
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- Physicists have run particle accelerators and unified the electromagnetic force and weak force interactions, and at higher energies, the same thing should happen with the strong nuclear force and, eventually, with gravity.
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- But even though theories say that should happen, nature doesn't always oblige. So far, no particle accelerator has reached energies high enough to unify the strong force with electromagnetism and the weak interaction. Including gravity would mean yet more energy.
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- It isn't clear whether scientists could even build one that powerful; the Large Hadron Collider (LHC), near Geneva, can send particles crashing into each other with energies in the trillions of electron volts ( 14 tera-electron volts, or TeV). To reach grand unification energies, particles would need at least a trillion times as much, so physicists are left to hunt for “indirect evidence” of such theories.
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- This Grand Unified Theories (GUTs) still have some problems because they predict other observations that so far haven't been seen. There are several GUTs that say protons, over immense spans of time (on the order of 10^36 years), should turn into other particles.
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- This has never been observed, so either protons last much longer than anyone thought or they really are stable forever. Another prediction of some types of GUT is the existence of magnetic monopoles, isolated "north" and "south" poles of a magnet, and nobody has seen one of those, either. It's possible we just don't have a powerful enough particle accelerator. Or, physicists could be wrong about how the universe works.
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- According to the current theories, if you were to drop a cube of iron into a blackhole, there would be no way to retrieve any of that information. That's because a blackhole's gravity is so strong that its escape velocity is faster than light and light is the fastest thing there is.
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- However, quantum mechanics says that quantum information can't be destroyed. “Quantum information” is a bit different from the information we store as “1s’ and “0s” on a computer, or the stuff in our brains.
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- That's because quantum theories don't provide exact information about where an object will be, like calculating the trajectory of a baseball in mechanics. Instead, such theories reveal the most likely location or the most likely result of some action.
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- As a consequence, all of the probabilities of various events should add up to 1, or 100 percent. When you roll a six-sided die, the chances of a given face coming up is one-sixth, so the probabilities of all the faces add up to 1, and you can't be more than 100 percent certain something will happen. Quantum theory is, therefore, called “unitary“. If you know how a system ends, you can calculate how it began.
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- To describe a blackhole, all you need is mass, angular momentum (if it's spinning) and charge. Nothing comes out of a blackhole except a slow trickle of thermal radiation called “Hawking radiation“.
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- As far as anyone knows, there's no way to do that reverse calculation to figure out what the blackhole actually gobbled up. The information is destroyed. However, quantum theory says that information can't be completely out of reach. Therein lies the "information paradox."
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- Rather than information being stored within the deep clutches of a blackhole, the information remains on its boundary, called the “event horizon“. Do naked singularities exist?
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- A singularity occurs when some property of a "thing" is infinite, and so the laws of physics as we know them break down. At the center of blackholes lies a point that is infinitely small and dense, packed with a finite amount of matter, a point called a “singularity“.
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- In mathematics, singularities come up all the time, dividing by zero is one instance, and a vertical line on a coordinate plane has an "infinite" slope. In fact, the slope of a vertical line is just undefined.
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- What would a singularity look like? And how would it interact with the rest of the universe? What does it mean to say that something has no real surface and is infinitely small?
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- A "naked" singularity is one that can interact with the rest of the universe. Blackholes have event horizons, spherical regions from which nothing, not even light, can escape. At first glance, you might think the problem of naked singularities is partly solved for black holes at least, since nothing can get out of the event horizon and the singularity can't affect the rest of the universe. It is "clothed," while a naked singularity is a blackhole without an event horizon.
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- Whether singularities can form without an event horizon is still an open question. And if they can exist, then Albert Einstein's theory of general relativity will need a revision, because it breaks down when systems are too close to a singularity.
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- Naked singularities might also function as wormholes, which would also be time machines ,though there's no evidence for this in nature.
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- If you swap a particle with its antimatter sibling, the laws of physics should remain the same. So the positively charged proton should look the same as a negatively charged antiproton. That's the principle of “charge symmetry“.
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- If you swap left and right, again, the laws of physics should look the same. That's parity symmetry. Together, the two are called “CP symmetry“. Most of the time, this physics rule is not violated. However, certain exotic particles violate this symmetry. There shouldn't be any violations of CP in quantum mechanics. We don't know why that is.
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- Though particle-physics questions account for many unsolved problems, some mysteries can be observed on a bench-top lab setup. “Sonoluminescence” is one of those. If you take some water and hit it with sound waves, bubbles will form.
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- Those bubbles are low-pressure regions surrounded by high pressure; the outer pressure pushes in on the lower-pressure air, and the bubbles quickly collapse. When those bubbles collapse, they emit light, in flashes that last trillionths of a second.
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- The problem is, it's far from clear what the source of the light is. Theories range from tiny nuclear fusion reactions to some type of electrical discharge, or even compression heating of the gases inside the bubbles.
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- Physicists have measured high temperatures inside these bubbles, on the order of tens of thousands of degrees Fahrenheit, and taken numerous pictures of the light they produce. But there's no good explanation of how sound waves create these lights in a bubble.
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- The Standard Model is one of the most successful physical theories ever devised. It's been standing up to experiments to test it for four decades, and new experiments keep showing that it is correct.
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- The Standard Model describes the behavior of the particles that make up everything around us, as well as explaining why, for example, particles have mass. In fact, the discovery of the Higgs boson, a particle that gives matter its mass, in 2012 was a historic milestone because it confirmed the long-standing prediction of its existence.
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- But the Standard Model doesn't explain everything. The Standard Model has made many successful predictions, the Higgs boson, the W and Z boson (which mediate the weak interactions that govern radioactivity), and quarks among them, so it is difficult to see where physics might go beyond it.
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- Most physicists agree that the Standard Model is not complete. There are several contenders for new, more complete models ,string theory is one such model, but so far, none of these have been conclusively verified by experiments.
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- Dimensionless constants are numbers that don't have units attached to them. The speed of light, for example, is a fundamental constant measured in units of meters per second (or 186,282 miles per second). Unlike the speed of light, dimensionless constants have no units and they can be measured, but they can't be derived from theories, whereas constants like the speed of light can be.
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- Certain "dimensionless constants" are considered fundamental to physics. In fact, there are many more than six; about 25 exist in the Standard Model. For example, the “fine structure constant“, usually written as alpha, governs the strength of magnetic interactions.
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- It is about 0.007297. What makes this number odd is that if it were any different, stable matter wouldn't exist. Another is the ratio of the masses of many fundamental particles, such as electrons and quarks, to the Planck mass, which is 1.22 ´1019 GeV/c2.
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- Physicists would love to figure out why those particular numbers have the values they do, because if they were very different, the universe's physical laws wouldn't allow for humans to be here. And yet there's still no compelling theoretical explanation for why they have those values. That is just what God decided.
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- What is gravity? Other forces are mediated by particles. Electromagnetism is the exchange of photons. The weak nuclear force is carried by W and Z bosons, and gluons carry the strong nuclear force that holds atomic nuclei together.
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- All of the other forces can be quantized, meaning they could be expressed as individual particles and have non-continuous values. Gravity doesn't seem to be like that. Most physical theories say it should be carried by a hypothetical massless particle called a “graviton“.
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- The problem is, nobody has found gravitons yet, and it's not clear that any particle detector that could be built could see them, because if gravitons interact with matter, they do it very, very rarely. So seldom that they'd be invisible against the background noise.
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- It isn't even clear that gravitons are massless, though if they have a mass at all, it's very, very small, smaller than that of neutrinos, which are among the lightest particles known.
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- String theory posits that gravitons (and other particles) are closed loops of energy, but the mathematical work hasn't yielded much insight so far. Because gravitons haven't been observed yet, gravity has resisted attempts to understand it in the way we understand other forces, as an exchange of particles.
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- Gravity may be operating as a particle in extra dimensions beyond the three of space (length, width, and height) and one of time (duration)we are familiar with, but whether that is true is still unknown.
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- The universe seems relatively stable. It has been around for about 13.8 billion years. But what if the whole thing were a massive accident? It all starts with the Higgs Boson and the universe's vacuum.
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- Vacuum, or empty space, should be the lowest possible energy state, because there's nothing in it. Meanwhile, the Higgs boson, via the so-called Higgs field, gives everything its mass.
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- The energy state of the vacuum can be calculated from the potential energy of the Higgs field and the masses of the Higgs and top quark. So far, those calculations appear to show that the universe's vacuum might not be in the lowest possible energy state.
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- That would mean it's a “false vacuum“. If that's true, our universe might not be stable, because a false vacuum can be knocked into a lower energy state by a sufficiently violent and high-energy event.
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- If that were to happen, there would be a phenomenon called “bubble nucleation“. A sphere of lower-energy vacuum would start growing at the speed of light. Nothing, not even matter itself, would survive. Effectively, we'd be replacing the universe with another one, which might have very different physical laws. We May Live in a Multiverse.
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- The idea of a false vacuum means that our universe might have popped into existence in just that way, when a previous universe's false vacuum was knocked into a lower energy state. Perhaps we were the result of an accident with a particle accelerator.
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- Those guys better e careful with throwing the wrong switch on that particle accelerator. We may get swallowed up by another universe. Then what would we do?
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November 28, 2021 PHYSICS - mysteries yet to be solved? 3360
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