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Do black body radiation of a 40-Earth mass osmium planet with radius of Earth which was just formed and has a temperature of 10000 degrees Celcius emit photons not just near it but even at infinity kind of like a black hole does? The only difference is that Hawking Radiation increases but the osmium planet Radiation will decrease unless there is another energy source from the core. So in theory it is possible to send information faster than light by just heating up the planet and then telling somebody 1 light year away to detect radiation particles because some of them can spawn many osmium planet radii away and then information can be sent faster than light through this process. Assume that the object is not surrounded by any matter and is in intergalactic space and atleast 10000 light years from any other object.

The reason is because in Hawking Radiation photons don't necessarily have to spawn in 4-5 event horizon radii, and can spawn in millions of radii away so there should be an analog for non-black hole objects that radiate as well right?

Qmechanic
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Roghan Arun
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1 Answers1

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No, the hot osmium planet generates blackbody photons by vibrations among the electrons near the surface, not in the nonlocal way Hawking radiation is emitted due to event horizons.

Both hot planets and black holes have blackbody spectra (give or take a few details of emissivity and greybody factors) because they represent the maximum entropy state of a photon gas (in the hole case, also a gas of other particles - there are corrections for higher temperatures). But the mechanisms of generating them are very different.

And no, you don't get superluminal signalling this way.

Anders Sandberg
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