A bstract method to unitarize the scattering amplitude produced by infinite-range forces is developed and applied Born terms. In order apply S -matrix techniques, based on unitarity analyticity, we first derive an free of infrared divergences. This achieved removing a divergent phase factor due interactions mediated massless particles in crossed channels, procedure that related previous formali...

We derive new representations of the Einstein-Hilbert action in which graviton perturbation theory is immensely simplified. To accomplish this, we recast the Einstein-Hilbert action as a theory of purely cubic interactions among gravitons and a single auxiliary field. The corresponding equations of motion are the Einstein field equations rewritten as two coupled first-order differential equatio...

In our previous work (Phys. Rev. D63, 085010, hep-th/0011290), we showed that the brane universe on the giant graviton moving in the near-horizon background of the dilatonic D(6 − p)-brane is described by the mirage cosmology. We study thermodynamic properties of the moving giant graviton by applying thermodynamics of cosmology and the recently proposed holographic principles of cosmology. We f...

We compute graviton scattering amplitudes in M theory using Feynman rules for a scalar particle coupled to gravity in eleven dimensions. The processes that we consider describe the single graviton exchange and the double graviton exchange, that in M~atrix! theory correspond to the v/r and v/r term, respectively. We argue that the v/r term appearing in M~atrix! theory at two loops can be obtaine...

We compute graviton scattering amplitudes in M-theory using Feynman rules for a scalar particle coupled to gravity in eleven dimensions. The processes that we consider describe the single graviton exchange and the double graviton exchange, that in M(atrix) theory correspond to the v/rand v/r-term respectively. We further show that the v/r-term appearing in M(atrix) theory at two-loops can be ob...

Gravitational interferometers and cosmological observations of the cosmic microwave background offer us prospect to probe laws gravity in primordial universe. To study interpret these datasets we need know possible graviton non-Gaussianities. this end, derive most general tree-level three-point functions (bispectra) for a massless all orders derivatives, assuming scale invariance. Instead worki...

In arXiv:2008.04330 it was shown that supertranslation and $\overline{SL(2,\mathbb C)}$ current algebra symmetries, corresponding to leading subleading soft graviton theorems, are enough determine the tree level MHV scattering amplitudes. this note we clarify role of subsubleading theorem in context.