Would the universe eventually return to a low entropy state after heat death due to quantum tunneling? |
- Would the universe eventually return to a low entropy state after heat death due to quantum tunneling?
- Can the equations of fluid dynamics be used to describe/model the flow of electrons?
- Does electron capture have a bearing on the particulate nature of the electron, versus its wave description?
- Has SETI changed their search parameters to account for recently-announced discoveries of exoplanets in habitable zones?
- On average, how far back do we need to trace an individual's family tree in order to find their most recent common ancestor with any other random person from the population?
- How do mirrors and the concept of left and right generalize to 4 and higher dimensional spaces?
- What does phase coherence mean experimentally when considering individual molecules?
- What are some unsolved problems in Computer Science?
- Why is escape velocity a thing? Isn't it escape force?
- Is it possible for planets to collide in orbit?
- If you get metal plates or if you have prosthetics, are you unable to enter into MRI's due to magnets?
- How does NASA detect planets near star with perpendicular disc to us as observer?
- Is there a physical limit to how much "space" can be put on a USB disk?
- Does knowing (or presuming) that a problem is solvable increase the likelihood of solving it?
- Is there any/could there be any two elements that could undergo both synthesis and decomposition in the same environment?
- How did we domesticate cats?
- Why are all deep trenches on Earth underwater?
- Does there exist an infinite series for all numbers?
- How are captured asteroids possible?
- Is a plane of single atoms visible?
| Posted: 25 Feb 2017 10:47 PM PST If the universe reached heat death (assuming something like the big rip didn't happen first), would quantum tunneling still occur? If so, would the universe be expected to eventually randomly reach a sufficiently low energy state that stars, galaxies, and planets could reform? I assume the odds of this happening are incredibly low, but if the universe is going to sit around in heat death forever wouldn't the probability approach 1? [link] [comments]  |
| Can the equations of fluid dynamics be used to describe/model the flow of electrons? Posted: 26 Feb 2017 07:05 AM PST |
| Posted: 25 Feb 2017 08:11 PM PST Does electron capture have a bearing on the particulate nature of the electron, versus its wave description? Quantum Field Theory demands that we commit to an ontology of the electron as a local ripple in the electromagnetic field, above and beyond that field's vacuum state. Beryllium is known to decay via a process of electron capture . (see http://hyperphysics.phy-astr.gsu.edu/hbase/Nuclear/radact2.html#c3 ) The Compton Wavelength of the electron has a size that is roughly on the order of the distance between the nucleus of the beryllium atom and its first inner electron orbital. This distance is between 0.90x10-10 m and 1.05 x 10-10 m . The radius of the nucleus, however is on the order of 10-15 meters. Imagine that we have committed to an ontology of the electron as synonymous with its Schroedinger Wave. Then we dispense with having to discuss the electron's "actual location" (as if it were also a localized particle or perhaps a point particle). We may even go on to say something clever like : "the actual location has no physical meaning". In this situation, we expect that the wave-like nature of the electron denies it's ability to interact with features of the universe smaller than the deBroglie wavelength. But from peak-to-peak of that wave, the nucleus of beryllium is approximately a factor of 0.0000159 times smaller. If electron capture physically happens (and it does happen) , and the nucleons are transformed into other particles as a result of this absorption, can we justifiably deny any meaning to the electron having a more "localized" character beyond its Schroedinger Wave and a purely QFT framework? Your thoughts .. ? [link] [comments]  |
| Posted: 25 Feb 2017 08:43 AM PST If SETI can now locate potentially-habitable exoplanets and calculate the round-trip time of electromagnetic emissions/broadcasts, are they focusing efforts on those locations? [link] [comments]  |
| Posted: 25 Feb 2017 07:40 AM PST |
| How do mirrors and the concept of left and right generalize to 4 and higher dimensional spaces? Posted: 25 Feb 2017 10:16 AM PST For example, does 4D space have another left/right type of symmetry that is independent of left/right? And how do mirrors work in 4D and higher spaces? I'm reading Martin Gardner's book entitled The Ambidextrous Universe, and this thought occurred to me. [link] [comments]  |
| What does phase coherence mean experimentally when considering individual molecules? Posted: 25 Feb 2017 04:19 PM PST For example, in superfluids and quantum optics the concept of phase coherence implies that the phase of each molecule's wave function is a constant difference away from its neighbouring molecules. I also realize that phase differences can result in interference effects. But what exact "observable" or tuneable property does phase correspond to here? Can an experimentalist (with perhaps advanced technology) independently modify the phase of a single molecule in some desired way? If so, how? [link] [comments]  |
| What are some unsolved problems in Computer Science? Posted: 25 Feb 2017 10:42 AM PST |
| Why is escape velocity a thing? Isn't it escape force? Posted: 25 Feb 2017 10:42 AM PST If I had a tiny rocket with an infinite energy supply but it could never move faster than 1 km/hr, wouldn't it eventually escape earth's atmosphere, albeit at a very slow speed? Alternatively, if escape velocity refers to a speed where no more thrust is required to escape, doesn't that make phrases like "earth's escape velocity" really imprecise? Doesn't it depend on starting elevation and the rate of acceleration to that escape velocity? [link] [comments]  |
| Is it possible for planets to collide in orbit? Posted: 25 Feb 2017 08:40 AM PST |
| Posted: 25 Feb 2017 08:27 AM PST Or as a broader question, if you have metal anywhere in your body due to medical issues, do you have issues being around magnets? [link] [comments]  |
| How does NASA detect planets near star with perpendicular disc to us as observer? Posted: 25 Feb 2017 06:13 AM PST |
| Is there a physical limit to how much "space" can be put on a USB disk? Posted: 25 Feb 2017 08:07 AM PST |
| Does knowing (or presuming) that a problem is solvable increase the likelihood of solving it? Posted: 25 Feb 2017 11:54 AM PST Regarding the story of George Dantzig solving 2 unsolved math problems because he didn't know that they were unsolved, I was wondering if there's evidence/studies showing that a presumption of solvability increases the probability of solving a problem. [link] [comments]  |
| Posted: 25 Feb 2017 03:20 PM PST I'm asking if you could have elements X and Y you could have both X + Y --> XY and XY --> X + Y but not have to change the surroundings, and would therefore spontaneously switch between XY and X + Y [link] [comments]  |
| Posted: 25 Feb 2017 03:11 AM PST They're not pack-animals (apart from lions I guess) and most wild cats are ferocious killers (as far as I know). So how did we manage to breed the small docile housecats? [link] [comments]  |
| Why are all deep trenches on Earth underwater? Posted: 25 Feb 2017 04:12 AM PST I know that approximately 70% of the Earth's surface is underwater therefore it would make sense for most of the deep trenches on earth to be underwater, but why aren't there any massively deep trenches/canyons/ravines on land? While asking this question I realized that most of the deep places on earth would naturally be filled with water because it would drain in, but even the deepest lakes and seas are nowhere near as deep as a somewhat deep area of the pacific ocean, let alone a trench such as the Mariana Trench. Why is this? [link] [comments]  |
| Does there exist an infinite series for all numbers? Posted: 25 Feb 2017 12:11 PM PST We know from basic taylor series that we can sum the reciprocals of all the factorials up to infinity and get e. We also have similar series for calculating pi and ln(2). Excluding the case of Riemann paradox, can we generate an infinite sum for all real numbers? And I suppose this naturally leads to another question, what about the complex numbers? [link] [comments]  |
| How are captured asteroids possible? Posted: 25 Feb 2017 05:12 AM PST How is it possible for a planets gravity to pull an asteroids into a stable orbit? [link] [comments]  |
| Is a plane of single atoms visible? Posted: 25 Feb 2017 01:51 AM PST Let's say someone produced a sheet with infinite area that is one atom thick of some element. Could you see this sheet and if not at what thickness of atoms do you start seeing it? [link] [comments]  |
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