  We propose a scaling ansatz for the elastic energy of a system near the
critical jamming transition in terms of three relevant fields: the compressive
strain $\Delta \phi$ relative to the critical jammed state, the shear strain
$\epsilon$, and the inverse system size $1/N$. We also use $\Delta Z$, the
number of contacts relative to the minimum required at jamming, as an
underlying control parameter. Our scaling theory predicts new exponents,
exponent equalities and scaling collapses for energy, pressure and shear stress
that we verify with numerical simulations of jammed packings of soft spheres.
It also yields new insight into why the shear and bulk moduli exhibit different
scalings; the difference arises because the shear stress vanishes as
$1/\sqrt{N}$ while the pressure approaches a constant in the thermodynamic
limit. The success of the scaling ansatz implies that the jamming transition
exhibits an emergent scale invariance, and that it should be possible to
develop a renormalization-group theory for jamming.
