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"The Hubble Constant"
Neal Jackson
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Abstract
1
Introduction
1.1
A brief history
1.2
A little cosmology
2
One-Step Distance Methods
2.1
Megamaser cosmology
2.2
Gravitational lenses
2.3
The Sunyaev–Zel’dovich effect
2.4
Gamma-ray propagation
3
Local Distance Ladder
3.1
Preliminary remarks
3.2
Basic principle
3.3
Problems and comments
4
The CMB and Cosmological Estimates of the Distance Scale
4.1
The physics of the anisotropy spectrum and its implications
4.2
Degeneracies and implications for
H
0
5
Conclusion
Acknowledgements
References
Footnotes
Updates
Figures
Tables
Historically, the Hubble constant has often been quoted as
, as a way of maintaining
agnosticism in an era where observations allowed a wide range in
. This is largely disappearing, but papers using
can
be hard to interpret
[
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]