On Friday, August 30, 2019 at 7:41:35 AM UTC-5, John Clark wrote:
>
> On Tue, Aug 27, 2019 at 3:08 AM Bruce Kellett <[email protected]
> <javascript:>> wrote:
>
> *> Virtual particles are a useful heuristic for evaluating a perturbation
>> series.*
>
>
> In the same way the existence of the sun is a useful heuristic for
> evaluating the Earth's future position in its orbit?
>
Virtual particles are not directly detectable. It is odd however that an
observer in an accelerated frame should in fact observe them. Accelerated
motion transforms virtual particles into a black body spectrum of radiation
with 1K for 10^{21}m/sec^2. This is Unruh radiation that is related to
Hawking radiation from a black hole. A black hole has a set of Boulware
vacua, where empty space in one is equivalent to another with radiation.
This is odd, and a probe on an accelerated frame will record a temperature,
even if another observer on an inertial frame witnesses no such radiation.
>
> *> There are no such things as quantum fluctuations in the requisite sense*
>
>
> What experimental results would be different if there *WAS *such a thing
> as quantum fluctuations in the requisite sense?
>
Quantum fluctuations simply represent the occurrence of a quantum particle
after decoherence or detection that deviates from the most expected value.
So in many ways a fluctuation refers not just to quantum mechanics, but
also quantum measurement or decoherence. Quantum mechanics is perfectly
deterministic, but measurements correspond to probability amplitudes so it
is also stochastic.
LC
>
> John K Clark
>
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