Oct. 27, 2006: dark matter, dark energy

 
 
An email written on Oct. 27, 2006:
 

 
Hi,

I’ve just come across this article (pointed to by FermiToday) :
http://www.nytimes.com/2006/10/24/science/space/24essa.html?_r=1&ref=science&oref=slogin

It puts together a few useful nos. in the same article. Not just the universe lifetime 13.7 +/- 0.15 billion years,
it also puts together the composition of matters in the universe:
                                        ordinary matter ~4%
                                         dark  matter   ~20%
                                         dark  energy  ~76% (+/- 2%)

I’ve been quite aware of the 96% (actually I remembered 95% — who can remember the 1% difference anyway).  But I’ve never quite remembered the division between dark matter and dark energy.   Particle physicists should hopefully start to have real dark matter candidates (actually neutrinos are part of it as it’s no longer massless) but dark energy has to be sorted out mostly by astrophysicists.

It also seems that the relatively new book that I’ve reserved from our town library : "Not even wrong : the failure of string theory and the search for unity in physical law" is ready for me to pick up !   I first heard about it from a Polish physicist during a Lancaster conference (UK) this July.  It seems very interesting …

Just to show that I still read stuff besides watching Ruby’s TV series ….

Kin

PS:   The word ‘glib’ in that NY Times article is one that I’ve only learnt during Tom Cruise’s awkward interview in the "Today Show" with Matt Lauer — when Tom slammed Brooke Shields’ drug use …

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About kinyip

An experimental particle physicist ...
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