tag:blogger.com,1999:blog-2846514233477399562.post3528705448785713196..comments2024-01-08T09:37:04.406+01:00Comments on RÉSONAANCES: Dark matter signal in Fermi?Jesterhttp://www.blogger.com/profile/08947218566941608850noreply@blogger.comBlogger9125tag:blogger.com,1999:blog-2846514233477399562.post-42792514125414685372012-04-18T12:24:49.524+01:002012-04-18T12:24:49.524+01:00I'm afraid Juan has already used up all his cr...I'm afraid Juan has already used up all his credit points.Jesterhttps://www.blogger.com/profile/08947218566941608850noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-8317558731764844312012-04-18T05:39:37.735+01:002012-04-18T05:39:37.735+01:00Did you see the latest paper by Juan Collar?
He ma...Did you see the latest paper by Juan Collar?<br />He made a 5.7 sigma discovery... But not in his data! In CDMS! This will be embarrassing for someone. The question is who...Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-8727646697496095322012-04-17T17:38:07.883+01:002012-04-17T17:38:07.883+01:00...sorry... size is right, i see that they are rou......sorry... size is right, i see that they are roughly the sqrt(counts),<br />however below 150 GeV the points are fluctuating in a not-gaussian way:<br />7 are roughly +1 sigma and 9 are roughly -1 sigma. I cannot find events in the +/- 0.5 sigma range, probability of this fact is small. Above 150 GeV i found a normal behavior. Maybe errors below 150 GeV are underestimated in this plot, however other plots of the same paper have better distributions.Francesco Nozzolihttps://www.blogger.com/profile/14961174913449763733noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-54412592555558018842012-04-17T17:00:25.162+01:002012-04-17T17:00:25.162+01:00Aren't they smaller just because the event cou...Aren't they smaller just because the event count is smaller? (assuming the errors are statistics dominated, not 100% sure about it but their sizes roughly look like sqrt n).Jesterhttps://www.blogger.com/profile/08947218566941608850noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-18020000297729184302012-04-17T16:51:05.096+01:002012-04-17T16:51:05.096+01:00Very interesting.
But i cannot understand why the ...Very interesting.<br />But i cannot understand why the error bars are smaller for E>150 GeV and larger below. It seems that the peak position is just near the error bar size transition.Francesco Nozzolihttps://www.blogger.com/profile/14961174913449763733noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-83448445638913183382012-04-17T16:11:55.910+01:002012-04-17T16:11:55.910+01:00I forgot to mention my own most likely candidate f...I forgot to mention my own most likely candidate for the galatic dark matter. It is not enough to criticize; one must also offer a credible alternative.<br /><br />I believe that the galactic dark matter is primarily in the form of primordial black holes, and microlensing observations support that possibility. The trillions of unbound planetary-mass "nomad" objects discovered in the last year may be the low-end tail of the PBH mass function.<br /><br />The main questions regarding PBHs are their abundance and their mass function.<br /><br />Microlensing observations are in the process of sorting this out.<br /><br />Robert L. Oldershaw<br />Discrete Scale RelativityRobert L. Oldershawhttps://www.blogger.com/profile/15396555790655312393noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-66323166172448214542012-04-17T15:26:57.364+01:002012-04-17T15:26:57.364+01:00Dark matter constitutes at least 20% of all matter...Dark matter constitutes at least 20% of all matter. Therefore, it should not be like looking for the proverbial needle in a haystack.<br /><br />Here we have yet another "mystery bump", which are so popular in particle physics these days.<br /><br />The author admits that it will probably take a few years to get the uncertainty down to the point where we can know what, if anything, we are dealing with.<br /><br />The Fermi team has virtually ruled out the most likely "WIMP" candidates.<br /><br />Dare we consider the possibility that the dark matter is not in the form of any kind of subatomic particle? Or do we chase the equivalent of unicorns forever?<br /><br />Robert L. Oldershaw<br />Discrete Scale RelativityRobert L. Oldershawhttps://www.blogger.com/profile/15396555790655312393noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-33079051283050112062012-04-17T12:39:06.096+01:002012-04-17T12:39:06.096+01:00No, the plot shows the energy of *single* photons ...No, the plot shows the energy of *single* photons as measured by Fermi, not the invariant mass of photon pairs. In this case the quantization of the photon energy is (supposedly) due to 2-to-2 kinematics of dark matter annihilation at rest.Jesterhttps://www.blogger.com/profile/08947218566941608850noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-90004455285176532942012-04-17T12:18:43.628+01:002012-04-17T12:18:43.628+01:00Interesting post. About the plot, how is the invar...Interesting post. About the plot, how is the invariant mass calculated, with any pairs of detected photon ? Thanks.Anonymousnoreply@blogger.com