Critical exponents from seven-loop strong-coupling<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>φ</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>theory in three dimensions

Using strong-coupling quantum field theory, we calculate highly accurate critical exponents $\ensuremath{\nu},\ensuremath{\eta}$ following from new seven-loop expansions in three dimensions. Our theoretical value for the critical exponent \ensuremath{\alpha} of the specific heat near the \ensuremath{\lambda} point of superfluid helium is \ensuremath{\alpha}=-0.01294\ifmmode\pm\else\textpm\fi{}0.00060, in excellent agreement with the space shuttle experimental value \ensuremath{\alpha}=-0.01285\ifmmode\pm\else\textpm\fi{}0.00038.

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