Universality of the Poincaré gravitational form factor constraints

Abstract

Relativistic spin states are convention dependent. In this work we prove that the zero momentum-transfer limits of the leading two form factors in the decomposition of the energy-momentum tensor matrix elements are independent of this choice. In particular, we demonstrate that these constraints are insensitive to whether the corresponding states are massive or not, and that they arise purely due to the Poincaré covariance of the states.

arXiv comment11 pages; v2: additional comments added, matches published version

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• Stress out of charmonia
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• Gravitational formfactors of the $\rho$ meson in QCD sum rules
• Gravitational form-factors of the $\pi$ and $K$ mesons in QCD sum rules