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Shift-symmetry soft theorem for a scalar bispectrum
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Physics
Branch of physics
Cosmology
Field theory in cosmology
Primordial non-Gaussianity
Primordial bispectrum
2026-09-28
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If
a
scalar
vacuum
is invariant under an exact
scalar-field shift symmetry
, the
Ward identity
makes the leading soft
bispectrum
vanish:
lim
q
→
0
P
ϕ
(
q
)
B
ϕ
(
q
,
k
,
∣
k
+
q
∣
)
=
0.
(1)
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(7)
Primordial bispectrum
Primordial non-Gaussianity
Field theory in cosmology
Cosmology
Branch of physics
Physics
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Past exam of the mathematics course of the University of Cambridge
/
2021
/
iii
/
Paper 312
/
2
/
c
/
Solution
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