Tag Archives: Sean Carroll

Memories Arise Out of a Equilibrium

Posted on August 6, 2008 by PlatoHagel

Sean Carroll of Cosmic Variance, California Institute of Technology and David Albert-Columbia UniversityScience Saturday: Time’s Arrow Some highlights at different spots of the exchange. How a philosopher of science spends his time (08:34) David describes his run-in with the “What … Continue reading →

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Incompatible Arrows

Posted on April 6, 2008 by PlatoHagel

Commerce is of trivial import; love, faith, truth of character, the aspiration of man, these are sacred.Ralph Waldo Emerson I just happen to visit Cosmic Variance yesterday after not visiting for some time. The timing seemed appropriate to my questions … Continue reading →

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Boltzmann’s Brain

Posted on January 15, 2008 by PlatoHagel

There is a new article by Dennis Overbye in the New York Times called, Big Brain Theory: Have Cosmologists Lost Theirs? It could be the weirdest and most embarrassing prediction in the history of cosmology, if not science. If true, … Continue reading →

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Bullet Cluster

Posted on December 21, 2007 by PlatoHagel

A purple haze shows dark matter flanking the “Bullet Cluster.” Image Credit: X-ray: NASA/CXC/M.Markevitch et al. Optical: NASA/STScI; Magellan/U.Arizona/D.Clowe et al. Lensing Map: NASA/STScI; ESO WFI; Magellan/U.Arizona/D.Clowe et al The amount of matter, or “mass,” in a galaxy is made … Continue reading →

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Dark Matter Issue

Posted on November 5, 2007 by PlatoHagel

We’re faced with the same choices today, with galaxies and clusters playing the role of the Solar System. Except that the question has basically been answered, by observations such as the Bullet Cluster. If you modify gravity, it’s fairly straightforward … Continue reading →

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The Arrow of Time

Posted on February 15, 2005 by PlatoHagel

Rudolf Julius Emanuel Clausius There is but one kind of entropy change. Entropy change is due to energy dispersal to, from, or within a system (as a function of temperature.), measured by microstate change: S = kB ln [microstates final … Continue reading →

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