论文标题
具有Kination和早期物质统治的非热暗物质的签名：重力波与实验室搜索
Signatures of Non-thermal Dark Matter with Kination and Early Matter Domination: Gravitational Waves versus Laboratory Searches
论文作者
论文摘要
暗物质（DM）的非热生产通常需要黑暗部门与可见扇区的微小耦合，因此众所周知，在实验室实验中狩猎是充满挑战的。在这里，我们提出了一种新的途径，以使用重力波（GW）和实验室搜索，在非标准宇宙学历史的背景下测试这种生产。我们研究了DM从标量场的衰减中形成的，我们将其称为重型顿，因为它在衰减时也会加热宇宙。我们考虑到宇宙在重新启动宇宙的能量密度并最终腐烂到标准模型和DM颗粒之前，宇宙将使用\ textit {类似kination {类似kination的} {kination like}僵硬方程（$ w _ {\ rm kin}> 1/3 $）进行阶段百分比。然后，我们研究通货膨胀期间的一阶张量扰动是如何产生的，其幅度可能会在Kination时代放大并导致可检测到的GW信号。要求Reheaton产生观察到的DM遗物密度，我们表明Reheaton的寿命和分支分数是由宇宙学场景决定的。特别是，我们表明它是长寿的，可以通过沙丘，Faser，Faser-II，Mathusla，Ship等各种实验进行搜索。我们还确定了导致GW探测器（例如Lisa和U-Decigo）互补可观察物的参数空间。特别是，我们发现具有状态方程参数$ W _ {\ rm kin} \大约0.5 $和一个re-Heaton Mass $ \ Mathcal o（0.5-5）$ GEV和DM $ $ \ MATHCAL O（10-100）$ KEV可能会导致两种separees separees的separts seprints of separts of separts。
The non-thermal production of dark matter (DM) usually requires very tiny couplings of the dark sector with the visible sector and therefore is notoriously challenging to hunt in laboratory experiments. Here we propose a novel pathway to test such a production in the context of a non-standard cosmological history, using both gravitational wave (GW) and laboratory searches. We investigate the formation of DM from the decay of a scalar field that we dub as the reheaton, as it also reheats the Universe when it decays. We consider the possibility that the Universe undergoes a phase %of kination with \textit{kination-like} stiff equation-of-state ($w_{\rm kin}>1/3$) before the reheaton dominates the energy density of the Universe and eventually decays into Standard Model and DM particles. We then study how first-order tensor perturbations generated during inflation, the amplitude of which may get amplified during the kination era and lead to detectable GW signals. Demanding that the reheaton produces the observed DM relic density, we show that the reheaton's lifetime and branching fractions are dictated by the cosmological scenario. In particular, we show that it is long-lived and can be searched by various experiments such as DUNE, FASER, FASER-II, MATHUSLA, SHiP, etc. We also identify the parameter space which leads to complementary observables for GW detectors such as LISA and u-DECIGO. In particular we find that a kination-like period with an equation-of-state parameter $w_{\rm kin}\approx 0.5$ and a reheaton mass $\mathcal O(0.5-5)$ GeV and a DM mass of $\mathcal O (10-100)$ keV may lead to sizeable imprints in both kinds of searches.
