What are quantum fluctuations, really? - Physics Stack Exchange
2018年1月28日 · But sometimes (e.g. in strongly coupled quantum systems) the state of interest is a fairly uniform superposition over a very wide range of different classical states, so the "single classical state plus small quantum fluctuations" picture is no longer useful.
heisenberg uncertainty principle - What is exactly a quantum ...
2019年5月15日 · $\begingroup$ Quantum fluctuations are not related to the uncertainty principle: you need not have 2 quantities at the same time to have fluctuations. Take the position alone and measure the position only : still you get different outcomes (unless you're in …
What's so "quantum" about quantum fluctuations in the CMB?
2023年6月20日 · Quantum fluctuations are the only known way to produce fluctuations small enough so as to be amplified by 10^30 to see what we see today as the ~1.8E-4 Kelvin fluctuations around the 2.7255K average of the perfectly random, isotropic and gaussian distribution (indistinguishable from a theoretical curve) of temperatures in the CMB.
How does the uncertainty principle relate to quantum fluctuations?
2016年4月19日 · I found a webpage that just kind of mentions the uncertainty principle lightly but doesn't really go into detail as to why we need it in the first place when considering quantum fluctuations and particles/anti-particles. I want to understand why we care about this equation as it is related to the creation and annihilation of virtual particles.
terminology - In layman's terms, what is a quantum fluctuation ...
2011年11月11日 · Quantum fluctuations are a popular buzzword for the statistical triviality that the variance (the spread of values) of a random variable A (in context of quantum physics, this could be the position of a particle or the amount of energy that it has) with zero mean is typically not zero - except that A is now an operator.
particle physics - Did quantum fluctuations create matter and …
2016年8月24日 · The problem is that "quantum fluctuations of the vacuum" doesn't actually mean anything like those articles make it sound like. If you look at In layman's terms, what is a quantum fluctuation? , the only rigorous meaning we can give to a "fluctuation" is that we have some average expectation value in the vacuum but the actual measurements can ...
What is the difference between quantum fluctuations and thermal ...
A simple (and quite accurate) answer is that quantum fluctuations are the fluctuations that exist at zero temperature. What it means is that even at zero temperature, there might be fluctuations in the measurements of observables, which does not happen for classical systems at zero temperature, due to the non-commutativity of the dynamical and ...
Confusion in understanding of quantum fluctuations and vacuum …
2016年5月20日 · In quantum physics, a quantum fluctuation (or quantum vacuum fluctuation or vacuum fluctuation) is the temporary change in the amount of energy in a point in space, as explained in Werner Heisenberg's uncertainty principle. No, not at all. In quantum mechanics, there are no fluctuations, at all.
Are quantum fluctuations observable? - Physics Stack Exchange
2020年11月27日 · It has also been hypothesized that energy from quantum fluctuations in the vacuum contributes to the energy required for the accelerated expansion of the universe, even though there is an ~80 orders of magnitude discrepancy between what the vacuum gives and what the universe requires for its observed acceleration.
Are quantum fluctuations completely uncaused events?
However it's more subtle than that - actually these quantum fields are subject to the uncertainty principle, and the "twitch" that is a quantum vacuum fluctuation is merely a potential field configuration arising from the uncertainty principle. these particles appear to be a completely uncaused event which defies reason