
TL;DR
The paper explores the implications of the Swampland conjecture on inflationary models and particle phenomenology, suggesting it could challenge slow-roll inflation and influence dark matter theories.
Contribution
It analyzes how the Swampland conjecture constrains inflation and introduces the concept of a drainon scalar field affecting cosmological evolution.
Findings
Swampland conjecture challenges slow-roll inflation models.
Scalar fields, including drainons, can satisfy the conjecture and influence dark matter.
Potential tension between the conjecture and observed scalar power spectrum.
Abstract
We discuss some implications of the recently suggested Swampland conjecture , together with a previous one . We list some implications for particle phenomenology and the Early Universe. The most intriguing implication of the conjecture could be a significant shift in allowed inflationary models, if not ruling out slow-roll (single field) inflation altogether. The tension of inflation and the conjecture does not only regard the amplitude of the tensor spectrum, but also its tilt, as implies both a yet unobserved tensor to scalar ratio, and an enhancement of the observed scalar power spectrum on large scales in discord with current data that favors a suppression on these scales. Scalar fields are abundant in theories of quantum gravity. Considering a second scalar field, its dynamics are dictated by the relation…
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