TY  - JOUR
TI  - Gravitational Wave Consistency Relations for Multifield Inflation
VL  - 114
AV  - public
Y1  - 2015/01/22/
EP  - 6
N1  - This version is the version of record. For information on re-use, please refer to the publisher?s terms and conditions.
N2  - 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
?
i
|
?
i
|
p
 have different predictions for 
n
t
/
r
 than single-field models, even when all the couplings are equal 
?
i
=
?
j
, due to the probabilistic nature of the fields? initial values. We analyze well-motivated prior probabilities for the 
?
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
?
 level. This gives a novel and testable prediction for the simplest multifield inflation models.
ID  - discovery1467847
UR  - https://doi.org/10.1103/PhysRevLett.114.031301
PB  - AMER PHYSICAL SOC
SN  - 1079-7114
JF  - Physical Review Letters
A1  - Price, LC
A1  - Peiris, HV
A1  - Frazer, J
A1  - Easther, R
KW  - Science & Technology
KW  -  Physical Sciences
KW  -  Physics
KW  -  Multidisciplinary
KW  -  Physics
KW  -  FLUX COMPACTIFICATIONS
ER  -