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We study the new physics contributions to neutrinoless double beta decay($0\nu\beta\beta$) in a TeV scale left-right model with spontaneous D-paritybreaking mechanism where the values of the $SU(2)_L$ and $SU(2)_R$ gaugecouplings, $g_L$ and $g_R$ are unequal. Neutrino mass is generated in the modelvia gauge extended inverse seesaw mechanism. We embed the model in anon-supersymmetric $SO(10)$ GUT with a purpose of quantifying the results dueto the condition $g_{L} \neq g_{R}$. We compare the predicted numerical valuesof half life of $0\nu\beta\beta$ decay, effective Majorana mass parameter andother lepton number violating parameters for three different cases; (i) formanifest left-right symmetric model ($g_L = g_R$), (ii) for left-right modelwith spontaneous D parity breaking ($g_L \neq g_R$), (iii) for Pati-Salamsymmetry with D parity breaking ($g_L \neq g_R$). We show how differentcontributions to $0\nu\beta\beta$ decay are suppressed or enhanced dependingupon the values of the ratio $\frac{g_R}{g_L}$ that are predicted fromsuccessful gauge coupling unification.

A comparative study of $0\nu\beta\beta$ decay in symmetric and asymmetric left-right model