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Escape from the swampland with a spectator field
- Source :
- Physical Review D. 101
- Publication Year :
- 2020
- Publisher :
- American Physical Society (APS), 2020.
-
Abstract
- In the context of string theory, several conjectural conditions have been proposed for low energy effective field theories not to be in swampland, the UV-incomplete class. The recent ones represented by the de Sitter and trans-Planckian censorship conjectures in particular seem to conflict with the inflation paradigm of the early universe. We first point out that scenarios where inflation is repeated several times (multiphase inflation) can be easily compatible with these conjectures. In other words, we relax the constraint on the single inflation for the large scale perturbations to only continue at least around 10 e-folds. In this context, we then investigate if a spectator field can be a source of the almost scale-invariant primordial perturbations on the large scale. As a consequence of such an isocurvature contribution, the resultant perturbations exhibit the nonvanishing non-Gaussianity in general. Also the perturbation amplitude on smaller scales can be completely different from that on the large scale due to the multiplicity of inflationary phases. These signatures will be a smoking gun of this scenario by the future observations.
- Subjects :
- Physics
010308 nuclear & particles physics
Perturbation (astronomy)
Swampland
String theory
01 natural sciences
General Relativity and Quantum Cosmology
Theoretical physics
Amplitude
Low energy
De Sitter universe
Non-Gaussianity
0103 physical sciences
Effective field theory
010306 general physics
Subjects
Details
- ISSN :
- 24700029 and 24700010
- Volume :
- 101
- Database :
- OpenAIRE
- Journal :
- Physical Review D
- Accession number :
- edsair.doi...........f59cb32b661a855b4e10db4260b3c652
- Full Text :
- https://doi.org/10.1103/physrevd.101.103514