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We present a successful realization of sneutrino tribrid inflation modelbased on a gauged $U(1)_{B-L}$ extension of Minimal Supersymmetric StandardModel (MSSM). A single interaction term involving the $B-L$ Higgs field and theright-handed neutrinos serves multiple purposes. These include the generationof heavy Majorana masses for the right-handed neutrinos to provide anexplanation for the tiny neutrino masses via the seesaw mechanism, a realisticscenario for reheating and non-thermal leptogenesis with a reheat temperatureas low as $10^6$ GeV, and a successful realization of inflation withright-handed sneutrino as the inflaton. The matter parity which helps avoidrapid proton decay survives as a $Z_{2}$ subgroup of a $U(1)$ $R$-symmetry.Depending on the choice of model parameters yields the following predictedrange of the tensor to scalar ratio, $3 \times 10^{-11}\lesssim r\lesssim7\times 10^{-4}$ ($ 6 \times 10^{-7} \lesssim r \lesssim 0.01 $), and therunning of the scalar spectral index, $-0.00022 \lesssim dn_s/d\ln k \lesssim-0.0026$ ($-0.00014 \lesssim dn_s/d\ln k \lesssim 0.005$), along with the $B-L$breaking scale, $ 3 \times 10^{14}\lesssim M/ \text{GeV}\lesssim 5 \times10^{15}$ ($ 6 \times 10^{15}\lesssim M/ \text{GeV}\lesssim 2 \times 10^{16}$),calculated at the central value of the scalar spectral index, $n_s =0.966$,reported by Planck 2018. The possibility of realizing metastable cosmic stringsin a grand unified theory setup is briefly discussed. The metastable cosmicstring network admits string tension values in the range $10^{-8} \lesssimG\mu_s \lesssim 10^{-6}$, and predicts a stochastic gravitational wavebackground lying within the 2-$\sigma$ bounds of the recent NANOGrav 12.5-yrdata.

Sneutrino Tribrid Inflation, Metastable Cosmic Strings and Gravitational Waves