Neutrino emission cooling

[Tom Mazanec]

Assume a Clarkean technology ("indistinguishable from magic") that cools matter by converting the thermal energy of the atoms into a 50-50 mixture of neutrinoes and anti-neutrinoes. What temperature could you get a sample of matter down to until the thermal energy of an atom would be too small to make up the mass of {neutrino + anti-neutrino} (I assume it would be different for different elements)?

Also, while I do not have a shadow of a ghost of a clue how to actually make such a cooler, is there any fundamental reason why it would be impossible?

[trinitree88]

Assume a Clarkean technology ("indistinguishable from magic") that cools matter by converting the thermal energy of the atoms into a 50-50 mixture of neutrinoes and anti-neutrinoes. What temperature could you get a sample of matter down to until the thermal energy of an atom would be too small to make up the mass of {neutrino + anti-neutrino} (I assume it would be different for different elements)?

Also, while I do not have a shadow of a ghost of a clue how to actually make such a cooler, is there any fundamental reason why it would be impossible?

Tom. If you actually had empty space, with neither the CMB photon flux, nor the ambient neutrino/antineutrino sea, nor the Zero Point Radiation from the Heisenberg Uncertainty Principle.....and you had your lump of normal baryonic matter at room temperature, it would have a few options:
1. If metallic,shaped like a blackbody (hollow cannonball with a small hole), it would radiate photons with an SED near-blackbody from it's spherical surface, and pretty blackbody from the small hole aperture (Stefan-Boltzmann Law), cooling as it did to the ZPR temperature. The surrounding space would develop a CMB temperature far below that of the presently observed one of... ~2.724 Kelvins.
2. It is not forbidden for weak interactions involving the neutral current (Z⁰) to occur, and they can only be photon/antiphoton or neutrino/antineutrino below 1.022 Mev/c²......so it's possible for it to cool some via that mechanism AFAIK.....suppositioned on your initial boundary conditions, until it reaches the ZPR temperature.

But, the reality is that your boundary conditions do not exist and a metallic cannonball is immersed in the CMB, ZPR, and the neutrino sea....even if far removed to some arbitrary void of stars and galaxies. As such it will reach an equilibrium temperature near to the CMB in short order via Newtonian cooling...exponential to the temperature difference.