Hubble data on 11 Type Ia supernova puts constraints on Dark Energy

[thed]

Press release can be read here. The paper submitted to ApJ can be read here.


Edited to add, <a href="http://supernova.lbl.gov/">Also read the Supernova Cosmology Project</a>

[Mark]

Originally posted by thed
Press release can be read here. The paper submitted to ApJ can be read here.


Edited to add, <a href="http://supernova.lbl.gov/">Also read the Supernova Cosmology Project</a>

thed thanks for posting this
and especially for including the link to the preprint
so one can go directly to the paper itself and skip
the press release

it looks as if the percentage estimates of dark matter and
energy did not shift significantly but just got more
reliable and sharply defined

what seems remarkable is that with the prevailing assumption
of flatness they have a handle on the "equation-of-state"
parameter "w" of dark energy
if it has been constant over time they say it is pretty close to
-1, which has been assumed by other people but with less confidence

in case anyone is curious about w, it being minus one means that the pressure exerted by dark energy equals -1 times it's energy density. w being negative is what makes the pressure negative----which when plugged into the cosmological model (Friedmann equation) accelerates the expansion, so w is a good thing to have an observational grip on

glad to see this, appreciate your posting it!