Tootfinder

2-loop scattering on superstring and supermembrane in flat space
M. Beccaria, R. Roiban, A. A. Tseytlin
https://arxiv.org/abs/2507.09528 https://

2-loop scattering on superstring and supermembrane in flat space
We consider the S-matrix of transverse scalar excitations on an infinite $D=10$ GS superstring and $D=11$ supermembrane in flat target space. We compute the 4-particle scattering amplitude in the 2-loop approximation and demonstrate that, like in the Nambu string case, the $D=10$ GS string S-matrix does not contain non-trivial 2d UV divergences (UV pole not accompanied by terms with logarithms of momenta is an artifact of dimensional regularization). This is consistent with underlying integrabi…

Late-Time Cosmic Acceleration from QCD Confinement Dynamics
Jonathan Rinc\'on, Humberto Mart\'inez-Huerta, Adolfo Huet, Alberto Hern\'andez-Almada, Miguel A. Garc\'ia-Aspeitia
https://arxiv.org/abs/2506.13812

Late-Time Cosmic Acceleration from QCD Confinement Dynamics
We explore a phenomenological extension of the Polyakov-Nambu-Jona-Lasinio (PNJL) model by introducing a coupling between the Polyakov loop potential and the Hubble parameter $H(t)$, inspired by the hypothesis that the QCD vacuum, particularly in the confined phase, may be sensitive to the large-scale dynamics of the universe. The coupling term, proportional to $(H(t)/H_0)^d f(Φ)$, vanishes in the deconfined regime and acts as a dynamical dark energy contribution at late times, without invokin…