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arXiv · 2412.09449

de Sitter Excited State in Heterotic E_8 x E_8 Theory

Suddhasattwa Brahma·Keshav Dasgupta·Bohdan Kulinich·Archana Maji·P. Ramadevi·Radu Tatar
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Abstract

We devise a novel duality sequence to study late-time cosmology in the heterotic E_8 x E_8 setup of Horava and Witten with dynamical walls that are moving towards each other. Surprisingly, we find that the dimensionally reduced four-dimensional theory does not violate NEC and therefore we do not see either a bouncing or an ekpyrotic phase. Instead, our four-dimensional setup shows a transient de Sitter phase that lies well within the trans-Planckian bound. This opens up a myriad of possibilities of addressing both phenomenological and cosmological issues, and here we concentrate on one such interesting model, an axionic cosmology with temporally varying axionic coupling.

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Suddhasattwa Brahma, Keshav Dasgupta, Bohdan Kulinich, Archana Maji, P. Ramadevi, Radu Tatar. 2024-12-12. de Sitter Excited State in Heterotic E_8 x E_8 Theory. https://doi.org/10.1002/prop.70047

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