eprintid: 1467847
rev_number: 36
eprint_status: archive
userid: 608
dir: disk0/01/46/78/47
datestamp: 2015-04-29 18:24:27
lastmod: 2021-10-04 00:59:09
status_changed: 2018-03-23 15:16:38
type: article
metadata_visibility: show
item_issues_count: 0
creators_name: Price, LC
creators_name: Peiris, HV
creators_name: Frazer, J
creators_name: Easther, R
title: Gravitational Wave Consistency Relations for Multifield Inflation
ispublished: pub
divisions: UCL
divisions: B04
divisions: C06
divisions: F60
keywords: Science & Technology, Physical Sciences, Physics, Multidisciplinary, Physics, FLUX COMPACTIFICATIONS
note: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
abstract: We study the tensor spectral index 
n
t
 and the tensor-to-scalar ratio 
r
 in the simplest multifield extension to single-field, slow-roll inflation models. We show that multifield models with potentials 
V
∼
∑
i
λ
i
|
ϕ
i
|
p
 have different predictions for 
n
t
/
r
 than single-field models, even when all the couplings are equal 
λ
i
=
λ
j
, due to the probabilistic nature of the fields’ initial values. We analyze well-motivated prior probabilities for the 
λ
i
 and initial conditions to make detailed predictions for the marginalized probability distribution of 
n
t
/
r
. With 
O
(
100
)
 fields and 
p
>
3
/
4
, we find that 
n
t
/
r
 differs from the single-field result of 
n
t
/
r
=
−
1
/
8
 at the 
5
σ
 level. This gives a novel and testable prediction for the simplest multifield inflation models.
date: 2015-01-22
date_type: published
publisher: AMER PHYSICAL SOC
official_url: https://doi.org/10.1103/PhysRevLett.114.031301
vfaculties: VMPS
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
article_type_text: Article
verified: verified_manual
elements_source: PubMed
elements_id: 1016573
doi: 10.1103/PhysRevLett.114.031301
lyricists_name: Peiris, Hiranya
lyricists_id: HVPEI01
actors_name: Dewerpe, Marie
actors_id: MDDEW97
actors_role: owner
full_text_status: public
publication: Physical Review Letters
volume: 114
article_number: 031301
pages: 6
issn: 1079-7114
citation:        Price, LC;    Peiris, HV;    Frazer, J;    Easther, R;      (2015)    Gravitational Wave Consistency Relations for Multifield Inflation.                   Physical Review Letters , 114     , Article 031301.  10.1103/PhysRevLett.114.031301 <https://doi.org/10.1103/PhysRevLett.114.031301>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/1467847/1/Peiris_PhysRevLett.114.031301.pdf