Shedding Light on Dark Matter


	Shedding Light on Dark Matter

RoadsideRay

12-8-2008 10:59 AM

195 views

tags:

dark matter, astrophysics, theory, dark radiation

RoadsideRay says:

Dark matter and dark energy have often gotten a bum rap. They have been accused of everything from altering cellular structure*, to speeding the expansion of the universe. I think further investigation is needed before we sully Dark Matter's good name.

*X-Files "Soft Light" Second Season

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12-9-2008 2:53 PM

balthazarus

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color:#ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/33ff223c-c164-4cae-bd03-208970c74d4a/ECF56A34-ED85-4E70-9553-B02D06A18297/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.sciam.com/article.cfm?id=new-theories-dark-matter" href="http://www.sciam.com/article.cfm?id=new-theories-dark-matter" style="font-size: 11px;">www.sciam.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.sciam.com/article.cfm?id=new-theories-dark-matter"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/www.sciam.com/img/87AD5635-1A3E-4A30-9BB1-FDAF4306FBB0" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.sciam.com/article.cfm?id=new-theories-dark-matter"><P class="caption" id="articleImgCap"><STRONG></STRONG> COME OVER TO THE DARK SIDE: The presence of dark matter [<I>purple</I>] is inferred by its gravitational pull in this composite image of the Bullet Cluster.<BR /><SPAN>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.</SPAN></P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.sciam.com/article.cfm?id=new-theories-dark-matter"><DIV>
A group of researchers at the California Institute of Technology proposes that dark matter <A href="http://arxiv.org/abs/0810.5126">could have its own force</A> analogous to electromagnetism—mediated, naturally, by "dark photons". Just as in regular electromagnetism, the force would act over long ranges, and the photon (the discrete unit of light energy) would be massless. As noted by study co-author Sean Carroll, a Caltech physicist, on the blog <EM>Cosmic Variance,</EM> the theory opens the door to a rich, as yet unseen world of dark radiation, even dark magnetic and electric fields.</DIV></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/ECF56A34-ED85-4E70-9553-B02D06A18297/blog/" title="blog or email this clip"><img src="http://content7.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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