[ExI] EmDrive again

[William Flynn Wallace]

'wussy' is a wussy word.  bill w

On Sat, Apr 23, 2016 at 12:17 PM, Anders Sandberg <anders at aleph.se> wrote:

> I like the concept of a Hubble-scale Casimir effect. I am not convinced
> people are getting real data from the drive (still seems to be awfully
> close to noise levels), but this is at least a theory suggesting a
> nontrivial testable consequence (reversed thrust for a particular geometry).
>
> Quantized inertia is not that weird. But if the drive can only work in
> increments of the inertia quantum it will be pretty wussy. McCulloch
> formula however seems to imply potentially bigger forces for very sharp
> cavities; presumably there is a softening below the microwave wavelength.
>
>
>
> On 2016-04-22 16:17, Giulio Prisco wrote:
>
>> MIT Technology Review reports that a recent article by Plymouth
>> University physicist Mike McCulloch proposes an explanation for the
>> anomalous EmDrive experimental results. According to the physicist,
>> inertia is the pressure the Unruh radiation predicted by general
>> relativity exerts on an accelerating body, and must be quantized at
>> small accelerations. McCulloch claims that the EmDrive effect can be
>> predicted by assuming that the photons in the EmDrive cavity have
>> inertial mass caused by Unruh radiation, whose wavelengths must fit
>> exactly within the cavity.
>>
>> McCulloch derives the order of magnitude of current experimental
>> results and proposes new tests to validate or invalidate his theory.
>> As it always happens when the EmDrive is mentioned, the MIT Technology
>> Review article is already triggering strong emotional reactions and
>> mass hysteria from both enthusiasts and skeptics. McCulloch's
>> theoretical framework is explained in the book "Physics from the Edge
>> - A New Cosmological Model for Inertia."
>>
>> "It is a prediction that was first made in the early 1970s by a
>> brilliant young Canadian physicist, Bill Unruh, who was then barely
>> out of graduate school. What he found was that, as a result of quantum
>> theory and relativity, there must be a new effect, never observed but
>> still universal, whereby anything which is accelerated must experience
>> itself to be embedded in a hot gas of photons, the temperature of
>> which is proportional to the acceleration." - Lee Smolin, "Three Roads
>> to Quantum Gravity."
>>
>>
>> https://www.technologyreview.com/s/601299/the-curious-link-between-the-fly-by-anomaly-and-the-impossible-emdrive-thruster/
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>
> --
> Anders Sandberg
> Future of Humanity Institute
> Oxford Martin School
> Oxford University
>
>
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