If they're right, these gamma rays may already have been detected by space-based telescopes meaning that the evidence is already there for any enterprising astronomer to tease apart.
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I doubt they said that, and whether they did or not the data is not there for any enterprising astronomer to tease out.
Any black hole of any realistic mass (say, 2.5 Solar masses and up) will take much, much longer than the current duration of our universe to evaporate. So, maybe this will happen, maybe not, but it for sure hasn't happened yet. Come back in 10^100 years and let's talk,
From doing a little digging here, in the original greek version of 1 Corinthians the translation of the word "esoptrou" (translated as mirror in the KJV) is uncertain.
However, the Latin Vulgate has " speculum" instead of "glass" - a speculum was a mirror. Given the age of the Vulgate, I think I would trust that translation and assume that a mirror was intended.
Knowing something of Biblical translation, I expect to be criticized for coming to any definite conclusion, but there it is.
Note that, unlike the KJV, PKD did not include the comma. Not sure what that means, but I doubt (in the title of a book) that it was done without reason.
I actually had to memorize that exact passage and recite it in class in 8th grade. I can still remember pacing back and forth in my parent's kitchen, trying to get it down.
Phillip K. Dick, "A Scanner Darkly," 1977. One of the main plot points is that the protagonist, a police informant, has to keep his true identity a secret from everyone, including his police handlers.
ancient city has a staggering ratio of 70 cars per 100 residents
I don't find that staggering. What I do find staggering is that the seems to be a ratio of about 70 cars per every parking space. Rome is a place where triple parking is pretty much routine.
It seems to me, from the British TV I watch, that the UK is clearly in need of a Time Lord's Charter, authorizing the use of the Tardis and associated technology in solving existential threats to the Earth.
We just had this last Friday, except that was for the search for WIMPs in an Italian mountain. Not much changed in the search for WIMPs in the last week.
I thought it sounded crazy until he told me the list of famous billionaires who have invested in the company.
Unfortunately, American politics shows that all too many billionaires are, in fact, crazy, and American business shows that all too many billionaires make bad investment decisions.
Er, \Lambda_CDM is the consensus cosmology these days, as it fits well with so much observational data, and predicted to an exquisite degree the anisotropies in the CMB as confirmed by everything from COBE & BOOMERANG to the latest WMAP data.
True, but all that means is that any DM theory must be consistent with Lambda CDM (which is true for all the ones I mentioned, at least for a suitable choice of prameters). Note that there is still the "core-cusp" problem, which it now doesn't look like _Warm_ Dark Matter can solve, and thus remains a problem for all of these theoretical choices. (Macroscopic DM can act as WDM for suitable choices of mass and density.)
CDM here is Cold Dark Matter, which of course need not just be WIMPs, but it was always a stretch to consider non-WIMP solutions, and MACHOs are effectively ruled out and axions have yet to appear in QCD experiments.
MACHOs are not ruled out for masses less than that of the Moon (although there are interesting new limits for some lower masses from femtolensing - see here for a more fine grained description of mass spectrum constraints for dense macroscopic DM).
As for axions, it seems strange to bring up that evidence for them has "yet to appear in QCD experiments," when of course evidence for WIMPs also has "yet to appear in QCD experiments." (There are of course also direct searches for both WIMPs, such as at Gran Sasso, and for axions, such as with the CERN helioscope, but in both cases these are also negative at present.)
Although pretty much all \LCDM cosmologists are gauge theorists,
Let's just say that, coming at this from an astronomical perspective, very few of the cosmologists I have known personally are particle physicists, and of course the Lambda part of Lambda CDM was forced upon us by astronomical observers. (I can, FWIW, remember going to cosmological talks in the 1980's where particle physicists confidently explained that the apparently large vacuum field energy in quantum field theories meant that the cosmological constant just had to be zero.)
that does not mean that they necessarily ever supported SUSY; being general relativists as well makes it pretty easy to adapt to pretty much arbitrary mechanisms that generate the metric, and sky observations suggest what those mechanisms are likely to be, constrained by what is already proven in SM/BTSM physics.
I don't think that anything has been experimentally proven in beyond standard model physics (except that neutrinos have mass).
It's not that WIMPs came from particle physics, it's that literally they must not interact electromagnetically at all, they must not feel the strong nuclear force, they must be essentially collisionless, they must not clump significantly (distributions are gaslike and stay that way all the way down to where a "cusp" could be), they must be individually massive, and they must move mostly thermally, or there would be easily-observed sky artifacts.
Limits on DM only limits on the Cross Section / Mass ratio. As Ariel Zhitnitsky is fond of pointing out, if the mass is small, the cross section has to be tiny, but if the mass is macroscopic, the cross section can be fairly large.
Those restrictions sure seems like a good fit for some sort of heavy neutrino, and hey if SUSY's (well, say MSSM's) neutralinos might fit (they don't totally) why oppose searches for them in labs motivated by particle theories?
I certainly do not oppose such searches.
Especially if the searches narrow the particle space in which various other WIMP candidates might hide.
However, in \LCDM there is nothing precluding a DM sector with arbitrary numbers of interacting fields; there could even be a whole "dark chemistry", with
Mussolini was on top of the massif, these detectors are deep inside the mountain (in a tunnel bored off of the 10-km A24 Autostrada tunnel underneath the mountain, which makes driving equipment in very convenient).
To be accurate, the search in Gran Sasso is a search for WIMPs (Weakly Interacting Massive Particles), which are one microphysical explanation for dark matter. I personally do not like the common conflation of dark matter (for which there is abundant evidence) with WIMPs (for which there is no evidence at all).
A lot of the interest in WIMPs comes from particle physics, due to the "WIMP miracle" (that hypothetical particles at the electro-weak scale, i.e., ~ 100 GeV, apparently have the right mass to explain dark matter) and the hypothesized connection between WIMPs and supersymmetry (i.e., that the WIMP could be a supersymmetric neutralino). After much experimental work, the WIMP miracle is almost dead experimentally, and the supposed connection to supersymmetry is not doing so well either.
I thought it was fairly conclusive that it wasn't a cypher - the symbols simply lack the entropy to represent language. It's just what you'd expect from someone combining a few symbols in nonsense ways as a hoax, and not statistically what cyphertext looks like at all. A bit disappointing, really.
At this stage, you do not need to "marginalize the non-believers," they have done that nicely for themselves. The real scientific debates over this were back in the 1980's, for pete's sake (I participated in some of them). Now it's all just politics.
Slashdot Mirror
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I doubt they said that, and whether they did or not the data is not there for any enterprising astronomer to tease out.
Any black hole of any realistic mass (say, 2.5 Solar masses and up) will take much, much longer than the current duration of our universe to evaporate. So, maybe this will happen, maybe not, but it for sure hasn't happened yet. Come back in 10^100 years and let's talk,
From doing a little digging here, in the original greek version of 1 Corinthians the translation of the word "esoptrou" (translated as mirror in the KJV) is uncertain.
However, the Latin Vulgate has " speculum" instead of "glass" - a speculum was a mirror. Given the age of the Vulgate, I think I would trust that translation and assume that a mirror was intended.
Knowing something of Biblical translation, I expect to be criticized for coming to any definite conclusion, but there it is.
Note that, unlike the KJV, PKD did not include the comma. Not sure what that means, but I doubt (in the title of a book) that it was done without reason.
There is a tide in the affairs of men
Which taken at the flood leads on to fortune;
Omitted, all the voyage of their life
Is bound in shallows and in miseries.
On such a full sea are we now afloat,
And we must take the current when it serves,
Or lose our ventures.
I actually had to memorize that exact passage and recite it in class in 8th grade. I can still remember pacing back and forth in my parent's kitchen, trying to get it down.
I cannot imagine a better argument for unionization than such gizmos.
Can you even imagine the nightmare of tracking those on people that don't want to wear them?
Sure. Do you know how call centers work? Having your actions tracked is part of the job. Don't follow the system, and you won't have a job.
Phillip K. Dick, "A Scanner Darkly," 1977. One of the main plot points is that the protagonist, a police informant, has to keep his true identity a secret from everyone, including his police handlers.
I don't find that staggering. What I do find staggering is that the seems to be a ratio of about 70 cars per every parking space. Rome is a place where triple parking is pretty much routine.
Now, now, that is clearly the Dalek's charter.
It seems to me, from the British TV I watch, that the UK is clearly in need of a Time Lord's Charter, authorizing the use of the Tardis and associated technology in solving existential threats to the Earth.
Yeah, the story editing on slashdot has always been poor. I just care more about the physics articles.
We just had this last Friday, except that was for the search for WIMPs in an Italian mountain. Not much changed in the search for WIMPs in the last week.
Must not have very many trees in your country.
Let's just say that the city has a long history of not dealing with snow well, and leave it at that.
Unfortunately, American politics shows that all too many billionaires are, in fact, crazy, and American business shows that all too many billionaires make bad investment decisions.
Iron curtain, no. Stasi, maybe.
Opposition parties should oppose stupid things (even if they would do the exact same thing if they were in power).
The problem with the GOP not that they oppose, it's that they seem to have lost the element of selection.
True, but all that means is that any DM theory must be consistent with Lambda CDM (which is true for all the ones I mentioned, at least for a suitable choice of prameters). Note that there is still the "core-cusp" problem, which it now doesn't look like _Warm_ Dark Matter can solve, and thus remains a problem for all of these theoretical choices. (Macroscopic DM can act as WDM for suitable choices of mass and density.)
MACHOs are not ruled out for masses less than that of the Moon (although there are interesting new limits for some lower masses from femtolensing - see
here for a more fine grained description of mass spectrum constraints for dense macroscopic DM).
As for axions, it seems strange to bring up that evidence for them has "yet to appear in QCD experiments," when of course evidence for WIMPs also
has "yet to appear in QCD experiments." (There are of course also direct searches for both WIMPs, such as at Gran Sasso, and for axions, such as with the CERN helioscope, but in both cases these are also negative at present.)
Let's just say that, coming at this from an astronomical perspective, very few of the cosmologists I have known personally are particle physicists, and of course the Lambda part of Lambda CDM was forced upon us by astronomical observers. (I can, FWIW, remember going to cosmological talks in the 1980's where particle physicists confidently explained that the apparently large vacuum field energy in quantum field theories meant that the cosmological constant just had to be zero.)
I don't think that anything has been experimentally proven in beyond standard model physics (except that neutrinos have mass).
Limits on DM only limits on the Cross Section / Mass ratio. As Ariel Zhitnitsky is fond of pointing out, if the mass is small, the cross section has to be tiny, but if the mass is macroscopic, the cross section can be fairly large.
I certainly do not oppose such searches.
Mussolini was on top of the massif, these detectors are deep inside the mountain (in a tunnel bored off of the 10-km A24 Autostrada tunnel underneath the mountain, which makes driving equipment in very convenient).
It's annoying to have a slashdot article that is not completely acronymed. For example, the first sentence of this article
could be
or even
You see? Every bit as clear, and less than half the length !
To be accurate, the search in Gran Sasso is a search for WIMPs (Weakly Interacting Massive Particles), which are one microphysical explanation for dark matter. I personally do not like the common conflation of dark matter (for which there is abundant evidence) with WIMPs (for which there is no evidence at all).
A lot of the interest in WIMPs comes from particle physics, due to the "WIMP miracle" (that hypothetical particles at the electro-weak scale, i.e., ~ 100 GeV, apparently have the right mass to explain dark matter) and the hypothesized connection between WIMPs and supersymmetry (i.e., that the WIMP could be a supersymmetric neutralino). After much experimental work, the WIMP miracle is almost dead experimentally, and the supposed connection to supersymmetry is not doing so well either.
However (not that you would know from reading most articles on the subject), there are a number of other viable theories for dark matter. These include axions, primordial black holes (maybe), and macroscopic quark nuggets, which would have important practical implications should they be detected.
I thought it was fairly conclusive that it wasn't a cypher - the symbols simply lack the entropy to represent language. It's just what you'd expect from someone combining a few symbols in nonsense ways as a hoax, and not statistically what cyphertext looks like at all. A bit disappointing, really.
That is wrong. The word entropy is similar to English, and, while the second order entropy is low, it is similar to Polynesian languages.
This is a nice nice review of Voynich studies.
AKA the billion Euro gamble. The Mars flyby was (if a much shorter blackout) considerably more dicey.
At this stage, you do not need to "marginalize the non-believers," they have done that nicely for themselves. The real scientific debates over this were back in the 1980's, for pete's sake (I participated in some of them). Now it's all just politics.
How many of this supposed 23% are watchers of Fox News ? Given their circulation, I am surprised it is not a bit higher.