Journal
FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS
Volume 67, Issue 1-2, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/prop.201800063
Keywords
swampland; primordial gravitational waves; string theory; inflation
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Funding
- ERC Consolidator Grant STRINGFLATION under the HORIZON 2020 grant [647995]
- German Science Foundation (DFG) within the Collaborative Research Centre 676 Particles, Strings and the Early Universe
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The swampland conjectures seek to distinguish effective field theories which can be consistently embedded in a theory of quantum gravity from those which can not (and are hence referred to as being in the swampland). We consider two such conjectures, known as the Swampland Distance and de Sitter Conjectures, showing that taken together they place bounds on the amplitude of primordial gravitational waves generated during single field slow-roll inflation. The bounds depend on two parameters which for reasonable estimates restrict the tensor-to-scalar ratio to be within reach of future surveys.
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