Speaker
Description
In this talk we discuss how the chiral effective Lagrangian is generalized systematically to curved spacetime and how the corresponding energy-momentum tensor (EMT) is obtained. As next, we discuss the nucleon and delta gravitational form factors, which are described by the diagonal hadronic matrix elements of the EMT at low energies. Furthermore, we discuss the transition gravitational form factors corresponding to the one pion graviproduction off the nucleon, in which the initial nucleon scatters on external gravitational field and emits a pion in the final state. This process is described by the non-diagonal hadronic matrix elements of the EMT at low energies. Moreover, we discuss how various non-diagonal matrix elements of the EMT can be parametrized in terms of independent and conserved Lorentz invariant structures.
