# Generating primordial features at large scales in two field models of inflation

@article{Braglia2020GeneratingPF, title={Generating primordial features at large scales in two field models of inflation}, author={Matteo Braglia and Dhiraj Kumar Hazra and L. Sriramkumar and Fabio Finelli}, journal={arXiv: Cosmology and Nongalactic Astrophysics}, year={2020} }

We investigate the generation of features at large scales in the primordial power spectrum (PPS) when inflation is driven by two scalar fields. In canonical single field models of inflation, these features are often generated due to deviations from the slow-roll regime. While deviations from slow-roll can be naturally achieved in two field models due to a sharp turn in the trajectory in the field space, features at the largest scales of the types suggested by CMB temperature anisotropies are…

## 12 Citations

Nonminimal Couplings and the Forgotten Field of Axion Inflation

- Physics
- 2020

We study the multifield dynamics of axion models nonminimally coupled to gravity. As usual, we consider a canonical $U(1)$ symmetry-breaking model in which the axion is the phase of a complex scalar…

Comparing multi-field primordial feature models with the Planck data

- Physics
- 2021

In this paper, we use a complete model of classical primordial standard clocks as an example to develop a methodology of directly comparing numerical predictions from complicated multi-field feature…

Gravitational waves and primordial black holes from supersymmetric hybrid inflation

- PhysicsPhysical Review D
- 2021

We study the effect of supergravity corrections due to a linear and a squared term in the Kähler potential, in the context of a supersymmetric hybrid inflation model. By appropriate choice of the…

Inflation story: slow-roll and beyond

- Physics
- 2021

We present constraints on inflationary dynamics and features in the primordial power spectrum of scalar perturbations using the Cosmic Microwave Background temperature, polarization data from Planck…

Integrable cosmological models with an additional scalar field

- Physics, MathematicsThe European Physical Journal C
- 2021

We consider modified gravity cosmological models that can be transformed into two-field chiral cosmological models by the conformal metric transformation. For the $$R^2$$
R
2
gravity model…

Opening the reheating box in multifield inflation

- PhysicsJournal of Cosmology and Astroparticle Physics
- 2021

The robustness of multi-field inflation to the physics of reheating is investigated. In order to carry out this study, reheating is described in detail by means of a formalism which tracks the…

Primordial Standard Clock Models and CMB Residual Anomalies

- Physics
- 2021

Matteo Braglia, 2, ∗ Xingang Chen, † and Dhiraj Kumar Hazra 2, ‡ Instituto de Fisica Teorica, Universidad Autonoma de Madrid, Madrid, 28049, Spain INAF/OAS Bologna, via Gobetti 101, I-40129 Bologna,…

Revisiting small-scale fluctuations in $\alpha$-attractor models of inflation

- Physics
- 2021

Cosmological α–attractors stand out as particularly compelling models to describe inflation in the very early universe, naturally meeting tight observational bounds from cosmic microwave background…

A manifestly covariant theory of multifield stochastic inflation in phase space: solving the discretisation ambiguity in stochastic inflation

- PhysicsJournal of Cosmology and Astroparticle Physics
- 2020

Stochastic inflation is an effective theory describing the super-Hubble, coarse-grained, scalar fields driving inflation, by a set of Langevin equations. We previously highlighted the difficulty of…

My title

- 2020

In this paper, we use a complete model of classical primordial standard clocks as an example to develop a methodology of directly comparing numerical predictions from complicated multi-field feature…

## References

SHOWING 1-10 OF 152 REFERENCES

Observational test of two-field inflation

- Physics
- 2002

We study adiabatic and isocurvature perturbation spectra produced by a period of cosmological inflation driven by two scalar fields. We show that there exists a model-independent consistency…

Strongly coupled perturbations in two-field inflationary models

- Physics
- 2011

We study models of inflation with two scalar fields and non-canonical kinetic terms, focusing on the case in which the curvature and isocurvature perturbations are strongly coupled to each other. In…

Influence of heavy modes on perturbations in multiple field inflation

- Physics
- 2012

We investigate linear cosmological perturbations in multiple field inflationary models where some of the directions are light while others are heavy (with respect to the Hubble parameter). By…

Punctuated inflation and the low CMB multipoles

- Physics
- 2009

We investigate inflationary scenarios driven by a class of potentials which are similar in form to those that arise in certain minimal supersymmetric extensions of the standard model. We find that…

Isocurvature perturbations in multiple inflationary models.

- Physics, MedicinePhysical review. D, Particles and fields
- 1994

The dynamics of long-wave isocurvature perturbations during an inflationary stage in multiple (multicomponent) inflationary models is calculated analytically for the case where scalar fields…

On the viability of m2phi2 and natural inflation

- Physics
- 2015

In the context of single field inflation, models with a quadratic potential and models with a natural potential with subplanckian decay constant are in tension with the Planck data. We show that,…

Slow-roll inflation for generalized two-field Lagrangians

- Physics
- 2005

We study the slow-roll regime of two-field inflation, in which the two scalar fields are also coupled through their kinetic terms. Such Lagrangians are motivated by particle physics and by…

Multiple field inflation

- Economics, Physics
- 2007

Inflation offers a simple model for very early evolution of our universe and the origin of primordial perturbations on large scales. Over the last 25 years we have become familiar with the…

Inflation with whip-shaped suppressed scalar power spectra.

- Physics, MedicinePhysical review letters
- 2014

It is found that a transition from a cubic to quadratic form of inflaton potential generates an appropriate suppression in the power of the scalar primordial spectrum that provides a significant improvement in fit compared to the power law model when compared with Planck and BICEP2 data together.

Higher order corrections to primordial spectra from cosmological inflation

- Physics
- 2001

Abstract We calculate power spectra of cosmological perturbations at high accuracy for two classes of inflation models. We classify the models according to the behaviour of the Hubble distance during…