On the cosmological implications of the string Swampland
Abstract
We study constraints imposed by two proposed string Swampland criteria on cosmology. These criteria involve an upper bound on the range traversed by scalar fields as well as a lower bound on |∇ΦV|/V when V > 0. We find that inflationary models are generically in tension with these two criteria. Applying these same criteria to dark energy in the present epoch, we find that specific quintessence models can satisfy these bounds and, at the same time, satisfy current observational constraints. Assuming the two Swampland criteria are valid, we argue that the universe will undergo a phase transition within a few Hubble times. These criteria sharpen the motivation for future measurements of the tensor-to-scalar ratio r and the dark energy equation of state w, and for tests of the equivalence principle for dark matter.
- Publication Date:
- Research Org.:
- Princeton Univ., NJ (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1463040
- Alternate Identifier(s):
- OSTI ID: 1546076
- Grant/Contract Number:
- FG02-91ER40671; 1600648; SC0007968
- Resource Type:
- Published Article
- Journal Name:
- Physics Letters B
- Additional Journal Information:
- Journal Name: Physics Letters B Journal Volume: 784 Journal Issue: C; Journal ID: ISSN 0370-2693
- Publisher:
- Elsevier
- Country of Publication:
- Netherlands
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Agrawal, Prateek, Obied, Georges, Steinhardt, Paul J., and Vafa, Cumrun. On the cosmological implications of the string Swampland. Netherlands: N. p., 2018.
Web. doi:10.1016/j.physletb.2018.07.040.
Agrawal, Prateek, Obied, Georges, Steinhardt, Paul J., & Vafa, Cumrun. On the cosmological implications of the string Swampland. Netherlands. https://doi.org/10.1016/j.physletb.2018.07.040
Agrawal, Prateek, Obied, Georges, Steinhardt, Paul J., and Vafa, Cumrun. Sat .
"On the cosmological implications of the string Swampland". Netherlands. https://doi.org/10.1016/j.physletb.2018.07.040.
@article{osti_1463040,
title = {On the cosmological implications of the string Swampland},
author = {Agrawal, Prateek and Obied, Georges and Steinhardt, Paul J. and Vafa, Cumrun},
abstractNote = {We study constraints imposed by two proposed string Swampland criteria on cosmology. These criteria involve an upper bound on the range traversed by scalar fields as well as a lower bound on |∇ΦV|/V when V > 0. We find that inflationary models are generically in tension with these two criteria. Applying these same criteria to dark energy in the present epoch, we find that specific quintessence models can satisfy these bounds and, at the same time, satisfy current observational constraints. Assuming the two Swampland criteria are valid, we argue that the universe will undergo a phase transition within a few Hubble times. These criteria sharpen the motivation for future measurements of the tensor-to-scalar ratio r and the dark energy equation of state w, and for tests of the equivalence principle for dark matter.},
doi = {10.1016/j.physletb.2018.07.040},
journal = {Physics Letters B},
number = C,
volume = 784,
place = {Netherlands},
year = {Sat Sep 01 00:00:00 EDT 2018},
month = {Sat Sep 01 00:00:00 EDT 2018}
}
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https://doi.org/10.1016/j.physletb.2018.07.040
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