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Evan O'Connor Retweeted
We're advertising nine postdoctoral positions at the OKC right now! http://www.okc.albanova.se/about-us/news/nine-postdoctoral-positions-at-the-oskar-klein-centre-stockholm-1.577911 …pic.twitter.com/iaQoFE46cl
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Evan O'Connor Retweeted
The
@EuCAPT White Paper "Opportunities and Challenges for Theoretical Astroparticle Physics in the Next Decade" (135 authors, 400 endorsers, 133 pages, 1382 refs.) is now on the@arxiv!
https://arxiv.org/abs/2110.10074 pic.twitter.com/OFX9FeCRvr
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Big shout out to
#opensource science. We use data from an OS core collapse code, GR1D, as initial conditions for an OS Monte Carlo code, SedonuGR, then run the output through two OS neutrino detection codes, SNEWPY and SNOwGLoBES!Show this threadThanks. Twitter will use this to make your timeline better. UndoUndo -
Oh, and that exponential decay? It quickly gets overwhelmed by the echo, but there is still hope. The echo could be quieter depending on the star, and low-energy neutrinos still show exponential decay. We can always hope for a close-by failed supernova!pic.twitter.com/o6lYFnkYI2
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It is not huge, but we estimate current neutrino detectors like Super-K will see a few events for a galactic failed supernova, as will next-generation detectors like JUNO and
@DUNEScience.@HyperKamiokande may see dozens neutrino-echo neutrinos.Show this threadThanks. Twitter will use this to make your timeline better. UndoUndo -
The scattering increases the length of the path of the neutrinos between when it was emitted and when it arrives at Earth, so the poll asked "What happens to the neutrino signal we observe?" The answer is that it has an echo, from all the coherent scatters in the star.pic.twitter.com/d25KjvgwHu
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Except that they can interact and they do. Neutrinos exiting the central region of the supernova can
@COHERENT_NUS scatter on the matter in the star, particularly the dense matter right outside the core. This only occurs for a very small percentage of neutrinos.Show this threadThanks. Twitter will use this to make your timeline better. UndoUndo -
But, there is a star still hanging around. Aside: Why are neutrinos such a good messenger for core-collapse supernovae? They hardly interact, they exit then protoneutron star and free stream to us, they may do some oscillations, but they don't interact.
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The neat thing with the exponential decay is if we could measure it we would have a direct measurement of the birth mass of the
! The decay constant is 3sqrt(3)*GM/c^3. Jeff & Josh have also shown that for rapidly rotating s the picture gets more complicated and exciting.Show this threadThanks. Twitter will use this to make your timeline better. UndoUndo -
The poll was deliberately tricky. I didn’t ask what the neutrino signal from the failed supernova was, but rather what we see on Earth. But it is true that the neutrino emission dies out exponentially. This was known (ok, for photons) since the golden age of GR in the 60s.https://twitter.com/sphericalbeaver/status/1441314050709676047 …
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Quiz time! What happens to the neutrino signal we observe when a
forms? 1. still emits neutrinos, just because light can’t escape, doesn’t mean neutrinos can’t. 2. Abruptly turns off, com’on, I read the literature. 3. Exponential decay, I took GR. 4. Other, leave a comment!Show this threadThanks. Twitter will use this to make your timeline better. UndoUndo -
There are lots of channels, but my favorite are failed supernovae, where before the supernova explosion is even started, the protoneutron star, umm, protocompact object, accretes enough mass to become unstable and collapses to a black hole
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Neutrinos are emitted from the hot, dense material in the soon-to-be neutron star, what we call the protoneutron star. Except, perhaps a better name is protocompact object, since some core-collapse events end with a black hole instead of a neutron star.
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In fact, supernova neutrinos were arguably the first multi messenger signal. SN1987A in the LMC not only lit up (figuratively, it wasn’t that close) the southern sky, it also lit up 3 neutrino detectors. We saw about 20 neutrinos from SN1987A.
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As
@sanjanacurtis recently reminded us, core-collapse supernovae are certainly the best of the supernova types. Here are two of my favorite reasons why. Core-collapse events are prodigious producers of neutrinos
, and are where black holes are formedhttps://twitter.com/sanjanacurtis/status/1442573720984317954 …Show this threadThanks. Twitter will use this to make your timeline better. UndoUndo -
Evan O'Connor Retweeted
Neutrinos, collapsing stars, black holes - what could be more fun? Possibly re-learning general relativity and working with people like Josh Wang (rightfully lead author), Samuel Gullin, and
@evanoc.https://arxiv.org/abs/2109.11430Thanks. Twitter will use this to make your timeline better. UndoUndo -
Evan O'Connor Retweeted
Nu Paper Alert
“SNEWPY: A Data Pipeline from Supernova Simulations to Neutrino Signals” appeared on the arXiv today: https://arxiv.org/abs/2109.08188
Paper with Segev BenZvi, Jim Kneller, @evanoc and the whole@SNEWSNeutrino collaboration Summary thread below!Show this threadThanks. Twitter will use this to make your timeline better. UndoUndo -
Evan O'Connor Retweeted
Big news: All AAS journals will transition to fully open access on 1 January 2022. https://aas.org/press/aas-journals-open-access …
#OpenAccess#OA#AASOpenAccess Under this change, all articles in the AAS journal portfolio will be immediately open for anyone to freely read, download, and share.pic.twitter.com/qieG5abvsk
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