论文标题
重力作为重新加热，瘦肉和暗物质的门户
Gravity as a Portal to Reheating, Leptogenesis and Dark Matter
论文作者
论文摘要
我们表明，仅利用重力作为充气，黑暗部门和标准模型（SM）之间的中间信使的最小情况，能够同时生成$ $ $ $ $ $ $ $ $ $ $，即通过瘦肉的生成，以及足够的热浴，可通过瘦肉生成的重生器不对称，baryon不对称。我们假设表格$ v（ϕ）\ propto ϕ^k $的充气电位约为通货膨胀结束时的最低限度。通过最小的重力相互作用加热的可能性已被对通货膨胀产生的过度重力波的限制所限制。因此，我们以几种方式扩展了最小模型：i）我们考虑非最小引力耦合 - 这指向dm质量的参数范围$ m_ {n_1} \ simeq 2-10 $ pev，右手中微质量和右手中性质量$ m_ $ t_ \ text {rh} \ sillsim 3 \ times 10^5 $ gev（$ k \ le 20 $）; ii）当DM与SM直接但小的Yukawa耦合时，我们提出了ICECUBE观察到的PEV过量的解释。 iii）我们还提出了一个新的方案，其中DM的重力产生是一个两步过程，首先是通过生产两个标量的生产，然后衰减到费米米奇DM最终状态。在这种情况下，没有螺旋性抑制会增强DM和BARYON不对称的产生，并为参数提供了很大的范围，包括MEV以下的暗物质质量，即使在重力相互作用负责重新加热的情况下，也可以通过宇宙21 cm线路观察到暗物质温暖度。我们还表明，可检测的原始引力波信号为$ t_ \ text {rh} \ Lessim 5 \ times 10^6 $ GEV探测这种情况的机会，例如BBO，Decigo，CE，CE和ET。
We show that a minimal scenario, utilizing only the graviton as an intermediate messenger between the inflaton, the dark sector and the Standard Model (SM), is able to generate $simultaneously$ the observed relic density of dark matter (DM), the baryon asymmetry through leptogenesis, as well as a sufficiently hot thermal bath after inflation. We assume an inflaton potential of the form $V(ϕ)\propto ϕ^k$ about the minimum at the end of inflation. The possibility of reheating via minimal gravitational interactions has been excluded by constraints on dark radiation for excessive gravitational waves produced from inflation. We thus extend the minimal model in several ways: i) we consider non-minimal gravitational couplings--this points to the parameter range of DM masses $M_{N_1} \simeq 2-10 $ PeV, and right-handed neutrino masses $M_{N_2} \simeq (5-20) \times 10^{11}$ GeV, and $T_\text{rh} \lesssim 3 \times 10^5$ GeV (for $k \le 20$); ii) we propose an explanation for the PeV excess observed by IceCube when the DM has a direct but small Yukawa coupling to the SM; and iii) we also propose a novel scenario, where the gravitational production of DM is a two-step process, first through the production of two scalars, which then decay to fermionic DM final states. In this case, the absence of a helicity suppression enhances the production of DM and baryon asymmetry, and allows a great range for the parameters including a dark matter mass below an MeV where dark matter warmness can be observable by cosmic 21-cm lines, even when gravitational interactions are responsible for reheating. We also show that detectable primordial gravitational wave signals provide the opportunity to probe this scenario for $T_\text{rh}\lesssim 5\times 10^6$ GeV in future experiments, such as BBO, DECIGO, CE and ET.
