论文标题
宇宙撞机物理学中的标量化学潜力
The Scalar Chemical Potential in Cosmological Collider Physics
论文作者
论文摘要
非高斯双光谱中共同移动动量中的非分析性是通货膨胀期间壳颗粒产生的独特迹象，它为质量的“直接检测”具有与通货膨胀哈勃规模（$ h $）一样大的“直接检测”。但是，这种非分析性的强度通常会因块状质量超过$ h $而被类似玻尔兹曼的因子指数下降。在本文中，我们研究了一个尺寸-5衍生物与重粒子电流的尺寸衍生物耦合提供的例外，并专门应用于两个实际标量。操作员具有“化学势”形式，它利用了充气的大动能尺度，$ \ dotx_ {0}^{1/2} \大约60h $，以充当标量粒子产生的有效来源。充气的衍生耦合可确保缓慢滚动电位的辐射稳定性，进而维持通货膨胀相关性的（近似）规模不变。我们表明，可以在双光谱中以强度$ f _ {\ mathrm {nl}} \ sim \ sim \ Mathcal {o}（0.01-10）$获得的信号可以获得boltzmann抑制作用。 $ 10^{15} $ GEV，在即将到来的LSS和更多未来派21 cm实验的灵敏度内。该机制不会调用任何特定的参数微调或扰动理论控制的崩溃。领先的贡献出现在树级上，与早期的非零旋转化学势研究相比，该计算在分析上可以分析并消除环的抑制。稳定的颗粒产生使我们能够推断出重颗粒的有效质量，并从双光谱振荡变化中推断出与共同移动动量的变化所产生的化学势。我们的分析为对具有非零自旋的重型玻色子的概括奠定了基础。
Non-analyticity in co-moving momenta within the non-Gaussian bispectrum is a distinctive sign of on-shell particle production during inflation, presenting a unique opportunity for the "direct detection" of particles with masses as large as the inflationary Hubble scale ($H$). However, the strength of such non-analyticity ordinarily drops exponentially by a Boltzmann-like factor as masses exceed $H$. In this paper, we study an exception provided by a dimension-5 derivative coupling of the inflaton to heavy-particle currents, applying it specifically to the case of two real scalars. The operator has a "chemical potential" form, which harnesses the large kinetic energy scale of the inflaton, $\dotϕ_{0}^{1/2} \approx 60H$, to act as an efficient source of scalar particle production. Derivative couplings of inflaton ensure radiative stability of the slow-roll potential, which in turn maintains (approximate) scale-invariance of the inflationary correlations. We show that a signal not suffering Boltzmann suppression can be obtained in the bispectrum with strength $f_{\mathrm{NL}} \sim \mathcal{O}(0.01-10)$ for an extended range of scalar masses, $M \lesssim \dotϕ_{0}^{1/2}$, potentially as high as $10^{15}$ GeV, within the sensitivity of upcoming LSS and more futuristic 21-cm experiments. The mechanism does not invoke any particular fine-tuning of parameters or breakdown of perturbation-theoretic control. The leading contribution appears at tree-level, which makes the calculation analytically tractable and removes the loop-suppression as compared to earlier chemical potential studies of non-zero spins. The steady particle production allows us to infer the effective mass of the heavy particles and the chemical potential from the variation in bispectrum oscillations as a function of co-moving momenta. Our analysis sets the stage for generalization to heavy bosons with non-zero spin.
