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Is solid metallic hydrogen metastable at room temperature?

Solid metallic hydrogen has apparently been recently created in the lab. If verified (see some doubts raised here), this could be a big deal (see accompanying question on citations), as the substance has been theorized for decades and may have very interesting properties.

Along with superconductivity (see accompanying question), a key issue is whether solid metallic hydrogen will be metastable at room temperature, i.e. stay in the same form even when the ultra-high pressure is released. The researchers apparently plan to test this after doing as many other tests as possible on their sample.

Will a solid metallic hydrogen be metastable at room temperature?

Resolution is positive if by Jan 1, 2020 a credible preprint or published paper reports that (a) solid metallic hydrogen has been created (by the Harvard group or another), and (b) remains stable at > 0 centigrade and < 2 atm of pressure for > 1 hour.


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