Doppler effect

[High prince of geeks]

Does the Doppler effect effect those who are of the third heightening.

[Guest]

Doppler is usually in regards to sound, did you mean 2nd Heightening?

3rd heightening allows them to perfectly identify the colour they are seeing, but does not actually change what they are seeing. This wouldn't have any real effect unless they were moving VERY fast.

 

Doppler should work normally in both cases, though someone of the 2nd Heightening with a lot of education and a very fast calculator could probably work out the speed an object was moving based on the pitch changes.

Edited May 16, 2015 by LabRat

[Haradion Drogon]

Doppler effect does affect light, as well as sound. Anything which behaves as a wave can experience it.
It is only observable in distant light, from galaxies which are accelerating away from or towards earth.

The huge velocities involved mean that the light is compressed or stretched - and since colour is determined by the wavelength of the light, shifts the colour away.

In fact, it is due to this acceleration that we know that the universe is expanding away from itself - and is doing so at an accelerated rate. This is perplexing, since over time, it should decellerate. This points towards some other force in the universe, causing it to accelerate apart. We have named this force due to "Dark Matter/Energy".


However, since the "Perfect Colour" identification, tells the exact hue of the colour, and this hue will Shift slightly, even if it is by a millionth of a metre of wavelength, whenever a person accelerates away from you, the colour is actually shifting.

This means thats the colour is changing by a very slight amount.
 

Does the 3rd heightening provide the hue of the material "At rest"? Even if it is accelerating away?

in which case, the observation of far galaxies on Nalthis, could be interesting, since it would allow one to accuratly calculate the distance of far galaxies, without relying on pulsars or nova or other such standard, meaning that the starnavigation of Nalthis will be highly advanced.

Given the requirement of specific distances, for the use of some transportation magics, it could be very useful, and might allow someone with access to both Selish and Nalthis magics to "Worldhop" while bypassing Shadesmere.
 

Edited May 17, 2015 by Haradion Drogon

[ostrichofevil]

I'd guess that the 3rd heightening is affected by the doppler effect, since the color information is based on the light waves the eye gets, and the doppler effect affects the light coming to your eyes.

[Senor Feesh]

I'd guess that the 3rd heightening is affected by the doppler effect, since the color information is based on the light waves the eye gets, and the doppler effect affects the light coming to your eyes.

You're assuming real-world science applies here. Gravity in the Cosmere works because of spiritual connections. It's been hinted that the nuclear forces may work on similar principles. I see no reason to assume that Realmatics shouldn't interfere with optics or relativity either

[natc]

Gravity as a spiritual connection, however, does not at all interfere with how gravity functions. Even lashed objects still accelerate consistently with how it happens normally, save for going the wrong way. It's more of an in-world explanation of the forces' existence than of any of it's fundamental properties.

Even when investiture breaks physics in the cosmere it never quite seems to completely break.

[Mr. Mister]

The huge velocities involved mean that the light is compressed or stretched - and since colour is determined by the wavelength of the light, shifts the colour away.

In fact, it is due to this acceleration that we know that the universe is expanding away from itself - and is doing so at an accelerated rate. 

Actually knowledge of that accelerated expansion comes not from the Doppler effect, but from cosmological redshift. It's better if first I introduce them more formally:

 

The "classic" Doppler effect takes place when the sender and the receiver have non-zero relative radial velocity from each other (that is, they're either separating or coming together), and the wave in question travels at a given speed relative to the medium, which also has its own reference system.

 

Sound can suffer from the classic Doppler effect. If c is soundspeed in the air, and v_s and v_r are the components of the velocities parallel to the source -> receiver axis, and as measured from the reference system where the air doesn't move, then the relation between the frequence f₀ at which the source emmits (NOT the one at which it travels) and f at which the receiver hears, is:

 

With light is more complicated, as the "medium", space-time, has no favorite reference system. The final result is that (with no accelerations), if the receiver moves at speed v as measured by the source and at that angle over there:

 

Now, cosmological redshift... instead of relative velocity between source and receiver, it is caused by the expansion of space. Space increases continuously, at a rate proportional to itself. So while a lightwave is traveling from a very distant galaxy, the distance between its oscillations will keep increasing because the space between them expands. This is only noticeable if the photon has been traveling for a stormton of time, but comparing its effects on galaxies at different distances has let us study the rate at which space expanded at previous points in the past, and we've determined that it's currently doing so acceleratedly.