Ivan Esteban

286 posts

Ivan Esteban

@iesteban_ph

Physicist. "We shall not cease from exploration. And the end of all our exploring will be to arrive where we started and know the place for the first time."

UPV/EHU, Bilbao Katılım Ocak 2021

131 Takip Edilen387 Takipçiler

Ivan Esteban retweetledi

Marco Kraan@MarcoJKraan·6 Şub

📢 Big news coming up from @km3net! 🗓️ Tune into it on Wednesday 12th of Feb, at 16:50 CET to hear about some exciting KM3NeT results! 🔗 Details can be found on the website: km3net.org/km3net-webinar/

Amstelveen, Nederland 🇳🇱 English

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Ivan Esteban@iesteban_ph·26 Kas

One of the issues of cosmological neutrino-mass determinations is that we see the combination of many different effects, so understanding what physics are we really measuring is tricky. See this thread on how we break down different effects, with interesting conclusions! 👇🏻

Rasmi Hajjar@RasmiHajjar

🚨New paper !🚨 📰arxiv.org/abs/2411.14524 Together with @tbertolez, @iesteban_ph, Olga Mena and Jordi Salvadó, we break down the cosmological CMB measurement that places bounds on neutrino masses: it is mostly constraining the evolution of the average energy in neutrinos!

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Ivan Esteban retweetledi

Rasmi Hajjar@RasmiHajjar·25 Kas

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Ivan Esteban@iesteban_ph·25 Haz

@LucienHeurtier @HostertMatheus @km3net @DMOPalmer This is indeed an option! We expect cosmic rays as such high energies to be extragalactic, and if the neutrino were galactic we would naively expect gamma rays with comparable energies from the galactic center; but in astrophysics few things are 100% certain :-)

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Lucien Heurtier@LucienHeurtier·21 Haz

@iesteban_ph @HostertMatheus @km3net @DMOPalmer And what about directions? The Mediterranean faces more the galactic center than the south pole does, isn't it? Any thought about that?

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Ivan Esteban@iesteban_ph·21 Haz

@LucienHeurtier @HostertMatheus @km3net @DMOPalmer Unfortunately, not: the IceCube detection efficiency approximately flattens out at high energies, and indeed they've conducted (null) searches for very-high-energy neutrinos arxiv.org/abs/2308.07656

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Lucien Heurtier@LucienHeurtier·21 Haz

@iesteban_ph @HostertMatheus @km3net @DMOPalmer Ok puzzling indeed. Can it be that the event is actually much more energetic than we think, that KM3net only saw a fraction of it and IceCube is just not designed to resolve such high energy events ?

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Ivan Esteban@iesteban_ph·21 Haz

@LucienHeurtier @HostertMatheus @km3net My point was statistical: in principle, we expect several sources of such cosmic rays, ~isotropically distributed. IceCube has been observing for a longer time, so on average it should've seen more (unless, as @DMOPalmer pointed out, IceCube got unlucky and KM3net lucky)

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Lucien Heurtier@LucienHeurtier·21 Haz

@HostertMatheus @iesteban_ph @km3net I am not sure why IceCube SHOULD have seen it. Can't the cosmic ray simply not have gone through IceCube? If we are talking about 1° of emergence angle at the level of the Mediterranean sea, I don't really see how it could have gone through the south pole...

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David Palmer@DMOPalmer·19 Haz

@iesteban_ph @HostertMatheus @km3net Or IceCube should have O(1) and they got lucky to be first with O(0.1) expected.

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Ivan Esteban@iesteban_ph·20 Haz

@DMOPalmer @HostertMatheus @km3net Absolutely!! This might even indicate a broken power law at high energies, which would be very exciting...

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Ivan Esteban@iesteban_ph·10 Nis

Lo mismito que mi universidad diciéndome que no me van a aplicar los incentivos por intensificación investigadora porque en los rankings aún consta mi afiliación anterior, y el objetivo de esos incentivos es que el nombre de la universidad figure en los rankings...😂

José María Torralba@JoseMTorralba

La Universidad de Zúrich, que actualmente aparece en la posición 80 del QS, ha decidido dejar de participar en los rankings internacionales por sus efectos negativos en la educación y la ciencia. swissinfo.ch/eng/education/…

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Ivan Esteban@iesteban_ph·5 Nis

@VivPoulin @nu_phases A related point: to exclude a hierarchy, one always excludes it _with respect to the other hierarchy_. So the important comparison is not between IH and the peak of the posterior, but between IH and NH. This usually has a much lower significance (arxiv.org/abs/2302.14159) 🙂

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Vivian Poulin@VivPoulin·4 Nis

@nu_phases Looks to me like we are closer to show that Mnu is 0 in cosmology than 0.06 eV ;)

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Daniel Green@nu_phases·4 Nis

I’m very excited to see analyses coming from DESI. A key highlight of this release is the new upper limit on the sum of neutrino masses, 70 meV at 95% which excludes the inverted hierarchy! The minimum is 60 meV which they should have evidence for soon.

DESI Survey@desisurvey

Breaking news!🎉 Today we announce the most precise measurements of our expanding Universe using the BAO signal in 6.1 Million galaxies and quasars from Year 1, tracing dark energy through cosmic time. See @BerkeleyLab PR at newscenter.lbl.gov/2024/04/04/des… 1/10 📸 Credit: @ClaireLamman

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Ivan Esteban@iesteban_ph·5 Nis

And this is just 1 year of data! 😍

DESI Survey@desisurvey

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Ivan Esteban retweetledi

Neutrino Arxiv preprints ⚛️📊📈@nuarxiv·30 Oca

📌 "The forest as a neutrino detector" 👤 Steven Prohira 🔗 arxiv.org/abs/2401.14454 #neutrino #hepex

Neutrino Arxiv preprints ⚛️📊📈 tweet media

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Ivan Esteban@iesteban_ph·3 Kas

@Lafe_Nelson @upvehu @ehuscientia @joachimkopp @ProfJohnBeacom Good question! I'm no expert in the topic, but there might be 2 potential avenues: * The details of the signal depend on the neutron star mass and radius * Neutron-star common envelope *is* very important o understand neutron-star mass growth, see ui.adsabs.harvard.edu/abs/2015ApJ...…

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Lafe Nelson@Lafe_Nelson·3 Kas

@iesteban_ph @upvehu @ehuscientia @joachimkopp @ProfJohnBeacom Congratulations! This is awesome work. Could this signal eventually be useful in identifying the upper mass limit for neutron stars?

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Ivan Esteban@iesteban_ph·2 Kas

New paper! arxiv.org/abs/2310.19868 Together with @ProfJohnBeacom and @joachimkopp, we unveil a potential new source of low-energy astrophysical neutrinos: giant stars engulfing a neutron star! Thread below 🧵

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Ivan Esteban@iesteban_ph·3 Kas

@AndrzOdrz @ProfJohnBeacom @joachimkopp Detectable common-envelope could also be way more common

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Ivan Esteban@iesteban_ph·3 Kas

@AndrzOdrz @ProfJohnBeacom @joachimkopp Very interesting question! The common-envelope energies are larger, plus of course for a pre-supernova you get supernova neutrinos later.

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Ivan Esteban@iesteban_ph·3 Kas

@AndrzOdrz @ProfJohnBeacom @joachimkopp The exact number depends on the details of the process, but estimates are of order a few months.

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Andrzej Odrzywołek@AndrzOdrz·3 Kas

@iesteban_ph @ProfJohnBeacom @joachimkopp For how long time these neutrinos are emitted?

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Ivan Esteban@iesteban_ph·3 Kas

@martinmbauer Thanks for sharing! 😃

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Martin Bauer@martinmbauer·3 Kas

Great thread!

Ivan Esteban@iesteban_ph

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Ivan Esteban@iesteban_ph·2 Kas

This is also my first paper with my new affiliation, @upvehu, my alma mater where I'm now assistant professor. It's been an incredibly hectic time, but I'm very excited about this career stage! #EHUpaper @ehuscientia And kudos to my collaborators! @joachimkopp @ProfJohnBeacom

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Ivan Esteban@iesteban_ph·2 Kas

The rate of these events is uncertain. It is definitely rarer than a supernova (~1/century), but theoretical estimates are not extremely small, ~0.1/century. And upcoming detectors could be sensitive to the whole galaxy. The only way of getting a signal is by looking for it!

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Keşfet

@km3net @tbertolez @LucienHeurtier @DMOPalmer @VivPoulin @nu_phases @Lafe_Nelson @upvehu