Observational constraints on the massive neutrinos induced late-time cosmic acceleration

We study a scenario based upon mass-less $\lambda \phi^4$ theory coupled to massive neutrino matter with $Z_2$ symmetry using conformal coupling, $A(\phi)=1-\alpha\phi^2/2M_{pl}^2;~\alpha=M^2_{pl}/M^2$ where $M$ is cut off mass. The chosen coupling generically leads the spontaneous breaking at late times such that field acquires non-zero mass, $m_\phi=(\alpha \Omega_{0\nu})^{1/2}H_0 \ll H_0 $ and rolls slowly around true ground state which emerges after breaking. For statistical analysis, we utilize Pantheon+Multi-Cycle Treasury OHD data sets. find even small fraction of density together its scalar can actually make our model behave like weakly dynamical dark energy have $\Lambda$CDM as limiting case.