In this paper, we analyze the inflationary cosmology using string field theory. This is done by using the zero level contribution from string field theory, which is a non-local tachyonic action. We will use the non-local Friedmann equations for this model based on string field theory, and calculate the slow-roll parameters for this model. We will then explicitly obtain the scalar and tensorial power spectrum, their related indices, and the tensor-to-scalar ratio for this model. Finally, we use cosmological data from Planck 2013 to 2018 to constrain the free parameters in this model, and find that string field theory is compatible with them.

中文翻译：

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弦场理论中的通货膨胀

在本文中，我们使用弦场理论来分析通货膨胀宇宙学。这是通过使用弦场理论的零电平贡献来完成的，这是一种非局部的速动作用。我们将基于弦场理论对该模型使用非局部Friedmann方程，并计算该模型的慢速滚动参数。然后，我们将明确获得该模型的标量和张量功率谱，它们的相关指标以及张量与标量之比。最后，我们使用普朗克2013年至2018年的宇宙学数据来约束该模型中的自由参数，并发现弦场理论与之兼容。