Simulating the universe(s) II: phenomenology of cosmic bubble collisions in full general relativity
Simulating the universe(s) II: phenomenology of cosmic bubble collisions in full general relativity
复制标题
模拟宇宙 II：完全广义相对论中宇宙气泡碰撞的现象学
DOI：
10.1088/1475-7516/2014/10/024
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发表时间：
2014
影响因子：
6.4
通讯作者：
H. Peiris
中科院分区：
文献类型：
--
作者：
C. Wainwright;M. Johnson;A. Aguirre;H. Peiris
观察气泡宇宙之间碰撞的遗迹将为永恒膨胀的多重宇宙的存在提供直接证据。无法观测到此类事件也可能对暴胀物理学产生重要的限制。实现这些前景需要根据永恒膨胀背后可能的拉格朗日标量场的性质对可观测值进行定量预测。基于之前的工作，我们详细地建立了这种联系。我们对单个标量场模型中的气泡碰撞现象进行了完全相对论数值研究，计算了各种模型中产生的共动曲率扰动。我们还构建了一组分析预测，使我们能够识别标量场拉格朗日的唯象相关属性。相关区域的分析预测和数值之间的一致性非常好，使我们能够将我们的结果推广到我们采用的数值研究模型之外。具体来说，签名完全由碰撞气泡在碰撞前的空间轮廓以及气泡中心之间的德西特不变距离决定。分析和数值结果支持指数 1< κ ≲ 2 的幂律拟合。对于相同气泡之间的碰撞，我们建立了观察到的碰撞幅度的下限，该下限由当前曲率能量密度设置。
Observing the relics of collisions between bubble universes would provide direct evidence for the existence of an eternally inflating Multiverse; the non-observation of such events can also provide important constraints on inflationary physics. Realizing these prospects requires quantitative predictions for observables from the properties of the possible scalar field Lagrangians underlying eternal inflation. Building on previous work, we establish this connection in detail. We perform a fully relativistic numerical study of the phenomenology of bubble collisions in models with a single scalar field, computing the comoving curvature perturbation produced in a wide variety of models. We also construct a set of analytic predictions, allowing us to identify the phenomenologically relevant properties of the scalar field Lagrangian. The agreement between the analytic predictions and numerics in the relevant regions is excellent, and allows us to generalize our results beyond the models we adopt for the numerical studies. Specifically, the signature is completely determined by the spatial profile of the colliding bubble just before the collision, and the de Sitter invariant distance between the bubble centers. The analytic and numerical results support a power-law fit with an index 1< κ ≲ 2. For collisions between identical bubbles, we establish a lower-bound on the observed amplitude of collisions that is set by the present energy density in curvature.
扭结冲突：碰撞不可积孤子中的相移。
影响因子：
8.6
作者：
Amin MA
通讯作者：
Amin MA
影响因子：
5
作者：
Amin M
通讯作者：
Amin M