----- Mensaje original ----- De: Robert Ulanowicz <u...@umces.edu> Fecha: Sábado, 29 de Diciembre de 2012, 4:26 pm > ************************************************************************** > > Stan, > > We know that the Fine-Structure Constant, alpha, has changed > over the > course of the universe > <http://en.wikipedia.org/wiki/Fine-structure_constant>. I > wrote in my > last book how I suspect others have "evolved" as well. > > What is needed is a good dimensional analysis. Unfortunately, > dimensional analysis seems foreign to physicists. Otherwise, they > wouldn't be making some of the incredible claims that are > abroad! :) > > Cheers, > Bob > > Quoting Stanley N Salthe <ssal...@binghamton.edu>: > > > Gordana has said: > > > > > > Information and Energy/Matter > > > > What can we hope for from studies of information > related to energy/matter > > (as it appears for us in space/time)? Information is a concept > known for > > its ambiguity in both common, everyday use and in its specific > technical> applications throughout different fields of research > and technology. > > However, most people are unaware that matter/energy today is > also a concept > > surrounded by a disquieting uncertainty. What for Democritus > were building > > blocks of the whole universe appear today to constitute only > 4% of its > > observed content. (NASA 2012) [1] The rest is labeled "dark matter" > > (conjectured to explain gravitational effects otherwise > unaccounted for) > > and "dark energy" (introduced to account for the expansion of the > > universe). We do not know what "dark matter" and "dark energy" > actually> are. This indicates that our present understanding of > the structure of the > > physical world needs re-examination. [...] > > > > > > Information and Energy/Matter > > Gordana Dodig Crnkovic > > > > Information 2012, 3(4), 751-755; > > http://unam.us4.list- > manage2.com/track/click?u=0eb0ac9b4e8565f2967a8304b&id=ae24f18d1e&e=d38efa683e> > > > > Special Issue "Information and Energy/Matter" > > > > http://unam.us4.list- > manage.com/track/click?u=0eb0ac9b4e8565f2967a8304b&id=ea193b9747&e=d38efa683e> > > See it on Scoop.it ( > > http://unam.us4.list- > manage.com/track/click?u=0eb0ac9b4e8565f2967a8304b&id=cdfa764e97&e=d38efa683e)> > , via Papers ( > > http://unam.us4.list- > manage.com/track/click?u=0eb0ac9b4e8565f2967a8304b&id=e23b9e2cd9&e=d38efa683e> > ) > > > > > > I would like to inquire whether any fis'rs might react to the > following> notion: > > > > Dark matter is postulated because the amount of matter > detectable in > > galaxies would be insufficient alone to explain how they hold > together> given the value of the gravitational constant. > > > > However, the information we glean from galaxies represents > their condition > > as it was a very long time ago, in an earlier universe. > > > > Is it not possible to resolve this puzzle less radically than > by inventing > > dark matter by supposing that the gravitational constant has > not been > > constant but has instead been changing, and was much stronger > in the past, > > which is when we detect these distant clusters of > matter? Perhaps G as > > been scaled to the rate of expansion of space? Perhaps > the rate of > > expansion was greater then than now, even with current acceleration? > > > > STAN >
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