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Hubble friction
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)
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Physics
Branches of physics
Cosmology
Scale factor (cosmology)
Expansion of the universe
Hubble parameter
Created
2026-09-24
Updated
2026-09-24
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Hubble friction
is the
damping
term proportional to the
Hubble parameter
in
a
field
or fluid
equation
in an expanding
universe
.
A
homogeneous
scalar
field
, for example, has the term
3
H
ϕ
˙
in its
equation
of
motion
.
Ancestors
(7)
Hubble parameter
Expansion of the universe
Scale factor (cosmology)
Cosmology
Branches of physics
Physics
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Expansion-weighted derivative of a passive density perturbation
Gravitational instability
Inflaton equation of motion
Past exam of the mathematics course of the University of Cambridge
/
2001
/
iii
/
Paper 35
/
1
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2001
/
iii
/
Paper 41
/
2
/
ii
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2001
/
iii
/
Paper 41
/
2
/
i
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2004
/
iii
/
Paper 59
/
3
/
b
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2005
/
iii
/
Paper 61
/
3
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2006
/
iii
/
Paper 62
/
2
/
a
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2006
/
iii
/
Paper 62
/
2
/
d
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2008
/
iii
/
Paper 62
/
2
/
c
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2017
/
iii
/
Paper 310
/
4
/
a
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2018
/
iii
/
Paper 310
/
4
/
a
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2019
/
ii
/
Paper 1
/
15B
/
a
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2021
/
iii
/
Paper 310
/
2
/
d
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2026
/
iii
/
Paper 310
/
4
/
c
/
Solution
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