Bose-Einstein condensation of paraexcitons in stressed<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>O
Reducing the multiplicity of the orthoexciton ground state in ${\mathrm{Cu}}_{2}$O by applying uniaxial stress greatly increases the quantum degeneracy of the excitonic gas prod...