Rights statement: © 2005 The American Physical Society
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Non-Gaussianity from preheating
AU - Enqvist, Kari
AU - Jokinen, Asko
AU - Mazumdar, Anupam
AU - Multamaki, Tuomas
AU - Vaihkonen, Antti
N1 - © 2005 The American Physical Society 4 pages ReVTeX4, discussion and references added, conclusions unchanged
PY - 2005/4/29
Y1 - 2005/4/29
N2 - We consider a two-field model for inflation where the second order metric perturbations can be amplified by a parametric resonance during preheating. We demonstrate that there can arise a considerable enhancement of non-Gaussianity sourced by the local terms generated through the coupled perturbations. We argue that the non-Gaussianity parameter could be as large as f_{NL} ~ 50. Our results may provide a useful test of preheating in future CMB experiments.
AB - We consider a two-field model for inflation where the second order metric perturbations can be amplified by a parametric resonance during preheating. We demonstrate that there can arise a considerable enhancement of non-Gaussianity sourced by the local terms generated through the coupled perturbations. We argue that the non-Gaussianity parameter could be as large as f_{NL} ~ 50. Our results may provide a useful test of preheating in future CMB experiments.
U2 - 10.1103/PhysRevLett.94.161301
DO - 10.1103/PhysRevLett.94.161301
M3 - Journal article
VL - 94
JO - Physical review letters
JF - Physical review letters
SN - 1079-7114
IS - 16
M1 - 161301
ER -