In a novel standard model extension it has been suggested that, even in the absence of right-handed neutrinos and type-I seesaw, purely triplet leptogenesis leading to baryon asymmetry of the universe can be realized by two heavy Higgs triplets which also provide type-II seesaw ansatz for neutrino masses. In this work we discuss this model predictions for hierarchical neutrino masses in concordance with recently determined cosmological bounds and oscillation data including ${\theta }_{23}$ in the second octant and large Dirac CP phases. We find that for both normal and inverted orderings, the model fits the oscillation data with the sum of the three neutrino masses consistent with current cosmological bounds determined from Planck satellite data. In addition, using this model ansatz for CP-asymmetry and solutions of Boltzmann equations, we also show how successful predictions of baryon asymmetry emerges in the cases of both unflavoured and two-flavoured leptogeneses. With additional $Z_2$ discrete symmetry, a minimal extension of this model is further shown to predict a scalar singlet WIMP dark matter in agreement with direct and indirect observations which also resolves the issue of vacuum instability persisting in the original model. Although the combined constraints due to relic density and direct detection cross section allow this scalar singlet dark matter mass to be $m_{\xi }=750$ GeV, the additional vacuum stability constraint pushes this limiting value to $m_{\xi }=1.3$ TeV which is verifiable by ongoing experiments. We also discuss constraint on the model parameters for the radiative stability of the standard Higgs mass.

在一种新颖的标准模型扩展中，有人提出，即使没有右手中微子和I型跷跷板，也可以通过两个重的希格斯三重态来实现导致宇宙重子不对称的纯三重态脂肪生成。 II中微子质量的跷跷板ansatz。在这项工作中，我们将根据最近确定的宇宙学界线和振荡数据（包括${\theta }_{23}$在第二个八分位数和大型Dirac CP阶段。我们发现，对于正序和反序，模型都将振动数据与三个中微子质量的总和拟合，该三个中微子质量与从普朗克卫星数据确定的当前宇宙学边界一致。此外，使用该模型ansatz进行CP不对称和Boltzmann方程的解，我们还显示了在无味和有两味瘦肉精的情况下如何成功实现重子不对称的预测。与其他${ž}_2$离散对称性，进一步证明了该模型的最小扩展可以与直接和间接观察相一致地预测标量单重态WIMP暗物质，这也解决了原始模型中持续存在的真空不稳定性问题。尽管由于文物密度和直接检测横截面而产生的综合约束使得该标量单重态暗物质质量为${米}_{\xi }=750$ GeV，附加的真空稳定性约束将这个极限值推到 ${米}_{\xi }=1.3$TeV可通过正在进行的实验验证。我们还讨论了标准希格斯质量辐射稳定性对模型参数的约束。