Swampland conjectures and single-field inflation in nonstandard cosmological scenarios
نویسندگان
چکیده
Swampland conjectures have attracted quite some interest in the cosmological community. They been shown to wide ranging implications, like constraints on inflationary models, primordial black holes, dark energy name a few. Particularly, their implications single-field models general relativity-based cosmology gathered huge attention. usual form be incompatible with these kinds of or induce severe fine tuning for them consistent conjectures. In this work, we show that large class can fact bypass problems faced by paradigms GR-Based cosmology. We use exact solution approach inflation same purpose and how string theoretic motivations swampland perfect symphony various nonstandard scenarios.
منابع مشابه
Testing and comparing tachyon inflation to single standard field inflation
We study the evolution of perturbations during the domination and decay of a massive particle species whose mass and decay rate are allowed to depend on the expectation value of a light scalar field. We specialize to the case where the light field is slow-rolling, showing that during a phase of inhomogeneous mass-domination and decay the isocurvature perturbation of the light field is converted...
متن کاملTachyon inflation : tests and comparison with single scalar field inflation
We compare the standard single scalar field inflationary predictions with those of an inflationary phase driven by a tachyon field. A slow-roll formalism is defined for tachyon inflation, and we derive the spectra of scalar and tensor perturbations as well as the consistency relations. At lowest order the predictions of standard and tachyon inflation are shown to be the same. Higher order devia...
متن کاملTrispectrum versus bispectrum in single-field inflation
In the standard slow-roll inflationary cosmology, quantum fluctuations in a single field, the inflaton, generate approximately Gaussian primordial density perturbations. At present, the bispectrum and trispectrum of the density perturbations have not been observed and the probability distribution for these perturbations is consistent with Gaussianity. However, Planck satellite data will bring a...
متن کاملLarge Non-Gaussianities in Single Field Inflation
We compute the 3-point correlation function for a general model of inflation driven by a single, minimally coupled scalar field. Our approach is based on the numerical evaluation of both the perturbation equations and the integrals which contribute to the 3-point function. Consequently, we can analyze models where the potential has a “feature”, in the vicinity of which the slow roll parameters ...
متن کاملOn non-gaussianities in single-field inflation
We study the impact of higher dimension operators in the inflaton Lagrangian on the non-gaussianity of the scalar spectrum. These terms can strongly enhance the effect without spoiling slow-roll, though it is difficult to exceed fNL ∼ 1, because the scale which suppresses the operators cannot be too low, if we want the effective field theory description to make sense. In particular we explicitl...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: International Journal of Modern Physics D
سال: 2022
ISSN: ['1793-6594', '0218-2718']
DOI: https://doi.org/10.1142/s0218271822501309