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News from the Swampland - constraining string theory with astrophysics and cosmology

N. Schöneberg, L. Vacher, J. D. F. Dias, M. M. C. D. Carvalho, C. J. A. P. Martins

Our current best guess for a unified theory of gravitation and quantum field theory (string theory) generically predicts a set of requirements for a consistently quantized theory, the Swampland criteria. Refined versions of these criteria have recently been shown to be in mild tension with cosmological observations. We summarize the status of the current impact of and constraints on the Swampland conjectures from cosmology, and subject a variety of dark energy quintessence models to recently released cosmological datasets. We find that instead of tightening the tension, the new data allows for slightly more freedom in the Swampland criteria. We further demonstrate that if there is no theoretical argument made to prevent interactions of the moduli fields with the electromagnetic sector, a novel fine-tuning argument arises from the extremely tight current constraints on such interactions. Finally, we conclude with a cautionary tale on model-independent reconstructions of the Swampland criteria from expansion rate data.

cosmology of theories beyond the SM; string theory and cosmology; dark energy theory; particle physics - cosmology connection; Astrophysics - Cosmology and Nongalactic Astrophysics;

Journal of Cosmology and Astroparticle Physics
Volume 10, Issue 039
2023 October

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Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia