The next-to-leading Wilson coefficient in D=7 maximal supergravity is minimized at the same U-duality symmetric point as the leading coefficient, supporting string universality.
The Quartic Effective Action for the Heterotic String,
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Bounds on the next-to-leading Wilson coefficient in maximal supergravity
The next-to-leading Wilson coefficient in D=7 maximal supergravity is minimized at the same U-duality symmetric point as the leading coefficient, supporting string universality.