The importance of being warm (during inflation)

Sam Bartrum; Mar Bastero-Gil; Arjun Berera; Rafael Cerezo; Rudnei O. Ramos; Joao G. Rosa

doi:10.1016/j.physletb.2014.03.029

The importance of being warm (during inflation)

Sam Bartrum, Mar Bastero-Gil, Arjun Berera, Rafael Cerezo, Rudnei O. Ramos, Joao G. Rosa^*

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract / Description of output

The amplitude of primordial curvature perturbations is enhanced when a radiation bath at a temperature T > H is sustained during inflation by dissipative particle production, which is particularly significant when a non-trivial statistical ensemble of inflaton fluctuations is also maintained. Since gravitational modes are oblivious to dissipative dynamics, this generically lowers the tensor-to-scalar ratio and yields a modified consistency relation for warm inflation, as well as changing the tilt of the scalar spectrum. We show that this alters the landscape of observationally allowed inflationary models, with for example the quartic chaotic potential being in very good agreement with the Planck results for nearly-thermal inflaton fluctuations, whilst essentially ruled out for an underlying vacuum state. We also discuss other simple models that are in agreement with the Planck data within a renormalizable model of warm inflation.

Original language	English
Pages (from-to)	116-121
Number of pages	6
Journal	Physics Letters B
Volume	732
Early online date	21 Mar 2014
DOIs	https://doi.org/10.1016/j.physletb.2014.03.029
Publication status	Published - 1 May 2014

Keywords / Materials (for Non-textual outputs)

Warm inflation
Chaotic inflation
Cosmic Microwave Background
SYMMETRY-BREAKING
PHASE-TRANSITION
FIELD-THEORY
DYNAMICS
UNIVERSE
FLATNESS
HORIZON
MODEL

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10.1016/j.physletb.2014.03.029Licence: Creative Commons: Attribution (CC-BY)

bererapaper10Submitted manuscript, 290 KB

Particle Theory at the Tait Institute
Ball, R., Berera, A., Boyle, P., Del Debbio, L., Figueroa-O'Farrill, J., Gardi, E., Horsley, R., Kennedy, A., Kenway, R., Pendleton, B. & Simon Soler, J.
STFC
1/10/11 → 30/09/15
Project: Research

Arjun Berera
- abph.ed.acuk
- School of Physics and Astronomy - Personal Chair in Theoretical Physics
Person: Academic: Research Active

Cite this

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title = "The importance of being warm (during inflation)",

abstract = "The amplitude of primordial curvature perturbations is enhanced when a radiation bath at a temperature T > H is sustained during inflation by dissipative particle production, which is particularly significant when a non-trivial statistical ensemble of inflaton fluctuations is also maintained. Since gravitational modes are oblivious to dissipative dynamics, this generically lowers the tensor-to-scalar ratio and yields a modified consistency relation for warm inflation, as well as changing the tilt of the scalar spectrum. We show that this alters the landscape of observationally allowed inflationary models, with for example the quartic chaotic potential being in very good agreement with the Planck results for nearly-thermal inflaton fluctuations, whilst essentially ruled out for an underlying vacuum state. We also discuss other simple models that are in agreement with the Planck data within a renormalizable model of warm inflation. ",

keywords = "Warm inflation, Chaotic inflation, Cosmic Microwave Background, SYMMETRY-BREAKING, PHASE-TRANSITION, FIELD-THEORY, DYNAMICS, UNIVERSE, FLATNESS, HORIZON, MODEL",

author = "Sam Bartrum and Mar Bastero-Gil and Arjun Berera and Rafael Cerezo and Ramos, {Rudnei O.} and Rosa, {Joao G.}",

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doi = "10.1016/j.physletb.2014.03.029",

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journal = "Physics Letters B",

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T1 - The importance of being warm (during inflation)

AU - Bartrum, Sam

AU - Bastero-Gil, Mar

AU - Berera, Arjun

AU - Cerezo, Rafael

AU - Ramos, Rudnei O.

AU - Rosa, Joao G.

PY - 2014/5/1

Y1 - 2014/5/1

N2 - The amplitude of primordial curvature perturbations is enhanced when a radiation bath at a temperature T > H is sustained during inflation by dissipative particle production, which is particularly significant when a non-trivial statistical ensemble of inflaton fluctuations is also maintained. Since gravitational modes are oblivious to dissipative dynamics, this generically lowers the tensor-to-scalar ratio and yields a modified consistency relation for warm inflation, as well as changing the tilt of the scalar spectrum. We show that this alters the landscape of observationally allowed inflationary models, with for example the quartic chaotic potential being in very good agreement with the Planck results for nearly-thermal inflaton fluctuations, whilst essentially ruled out for an underlying vacuum state. We also discuss other simple models that are in agreement with the Planck data within a renormalizable model of warm inflation.

AB - The amplitude of primordial curvature perturbations is enhanced when a radiation bath at a temperature T > H is sustained during inflation by dissipative particle production, which is particularly significant when a non-trivial statistical ensemble of inflaton fluctuations is also maintained. Since gravitational modes are oblivious to dissipative dynamics, this generically lowers the tensor-to-scalar ratio and yields a modified consistency relation for warm inflation, as well as changing the tilt of the scalar spectrum. We show that this alters the landscape of observationally allowed inflationary models, with for example the quartic chaotic potential being in very good agreement with the Planck results for nearly-thermal inflaton fluctuations, whilst essentially ruled out for an underlying vacuum state. We also discuss other simple models that are in agreement with the Planck data within a renormalizable model of warm inflation.

KW - Warm inflation

KW - Chaotic inflation

KW - Cosmic Microwave Background

KW - SYMMETRY-BREAKING

KW - PHASE-TRANSITION

KW - FIELD-THEORY

KW - DYNAMICS

KW - UNIVERSE

KW - FLATNESS

KW - HORIZON

KW - MODEL

U2 - 10.1016/j.physletb.2014.03.029

DO - 10.1016/j.physletb.2014.03.029

M3 - Article

SN - 0370-2693

VL - 732

SP - 116

EP - 121

JO - Physics Letters B

JF - Physics Letters B

ER -

The importance of being warm (during inflation)

Abstract / Description of output

Keywords / Materials (for Non-textual outputs)

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Particle Theory at the Tait Institute

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Arjun Berera

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