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Questions tagged [neutrinos]

Questions regarding a family of extremely low-mass, electrically neutral particles described in the Standard Model of particle physics.

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Would (almost all) neutrinos pass straight through a neutron star? [duplicate]

What percentage of them would not?
Miss_Understands's user avatar
10 votes
2 answers
2k views

How are neutrinos able to cause a supernova explosion?

I was trying to understand the type II supernovae's core collapse mechanism from Wikipedia. As the core's density increases, it becomes energetically favorable for electrons and protons to merge via ...
Kshitij Kumar's user avatar
8 votes
1 answer
562 views

References about neutrinos getting clumped in "structures" in the future?

I was wondering whether (standard model) neutrinos could form clumped structures (like halos perhaps). The problem with this is that neutrinos have a very light mass, have a great speed and do not ...
vengaq's user avatar
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7 votes
2 answers
3k views

Is there a limit to the Schwarzschild radius?

The Schwarzschild radius is a way for us to calculate the extent to which something has to be shrunk in order for it to become a black hole but I was wondering is there a limit to the object that we ...
Shubhankar Dixit's user avatar
4 votes
0 answers
155 views

If a Milky Way supernova were to happen, how long would it take for astronomers to be notified?

If a Supernova were to happen in the Milky Way, how long would it take for astronomers to be notified? How long would it take for the people running the gravitational wave and neutrino detectors to ...
blademan9999's user avatar
2 votes
1 answer
82 views

Could we detect neutrinos from a supernova in Andromeda?

Could we detect neutrinos from a supernova in Andromeda? Are our neutrino detectors sensitive enough to do so? They detected 13 neutrinos from SN1987A, which was 186,000 light years away, but our ...
blademan9999's user avatar
5 votes
1 answer
637 views

When did our neutrino detectors become sensitive enough to detect supernovas in the core of the Milky Way?

When did our neutrino detectors become sensitive enough to be able to detect supernovas occurring in the Core of the Milky Way galaxy? I know the answer is well before 1987, because we detected the ...
blademan9999's user avatar
5 votes
0 answers
122 views

When's the most recent time that we could have missed a supernova?

I know that if a supernova were to happen in the galactic Core, the dust there would prevent the visible light from it from reaching us, so if one were to have occurred there in say 1900, we wouldn't ...
blademan9999's user avatar
1 vote
0 answers
32 views

How can scientists deduce the number of types of neutrinos, or 'effective number', from Planck satellite data?

Is it related to the way they deduce the Hubble constant from Planck data? Would more types of oscillating and mixing neutrinos mean faster or slower expansion of the universe? Would a fourth mass ...
Kurt Hikes's user avatar
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1 vote
0 answers
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Why does the 'Big Bang Nucleosynthesis' theory require that neutrinos, or at least sterile neutrinos, have a LARGE mass rather than a tiny one?

From Wikipedia, Sterile neutrino Particles that possess the quantum numbers of sterile neutrinos and masses great enough such that they do not interfere with the current theory of Big Bang ...
Kurt Hikes's user avatar
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5 votes
0 answers
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A new (radio) neutrino telescope in Greenland?

I just stumbled upon ScienceMag news from July 14th, 2021 which says: By placing hundreds of radio antennas on the ice surface and dozens of meters below it, they hope to trap elusive particles known ...
B--rian's user avatar
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5 votes
2 answers
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Is there an equivalent of the red shift effect for cosmic rays?

I had read somewhere that light from very distant sources can be measured to be increasingly red shifted the further away the object is (due to cosmic inflation?). Suppose you had an object emitting ...
Sidharth Ghoshal's user avatar
18 votes
2 answers
2k views

How can astronomers pinpoint the location of the source of a neutrino?

In the popular press, in recent months, we have heard a lot about high-energy neutrinos from far outside our solar system reaching our detectors.... But I wonder... If a single neutrino from a great ...
Kurt Hikes's user avatar
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5 votes
1 answer
118 views

How can astrophysicists discriminate between pp-chain solar neutrinos and CNO-cycle ones?

Astrophysicists at the Borexino experiment in Italy have recently claimed that they have detected CNO-cycle neutrinos coming from the Sun. It was the Cover story for the November 26 issue of Nature. I ...
Kurt Hikes's user avatar
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4 votes
2 answers
256 views

Could not slow neutrinos orbit galaxies and clusters, thus comprising a large component of even COLD dark matter?

Cold dark matter is the type of dark matter that is most eminently neutrino-free. But neutrinos themselves suffer a large survivorship detection bias (“all the neutrinos you can detect necessarily ...
Mark Besser's user avatar
1 vote
1 answer
85 views

Could neutrinos be at least a part of Dark Matter?

What we know about neutrinos - its are almost invisible the same as Dark Matter, right? Why Dark Matter could not consist of neutrinos?
fstawyug4i's user avatar
9 votes
3 answers
2k views

Can exoplanets be found using neutrino detectors?

I read that KamLAND can detect geoneutrinos produced by thorium and uranium decay in Earth's crust. Could a larger detector detect neutrinos from other planets in the solar system or perhaps even ...
Daniel's user avatar
  • 205
10 votes
1 answer
757 views

How much mass per year may the black hole at the center of the Milky Way gain by capturing neutrinos?

If we are immersed in a sea of neutrino, then a black hole should be constantly capturing the ones crossing its event horizon, and gaining mass. How much neutrino mass falls inside a black hole per ...
tutizeri's user avatar
  • 357
2 votes
2 answers
433 views

What kind of radiation do supernova remnants emit?

Do supernova remnants emit EM radiation? Moreover can neutrinos be emitted by these remnants?
learner's user avatar
  • 341
2 votes
1 answer
305 views

Neutrino Modelling in Friedmann Equation

I'm trying to model neutrinos in the Friedmann Equation. I've covered the case of the Benchmark Model where we have matter, radiation, curvature, and the cosmological constant, Lambda. I know my ...
Robin Dhillon's user avatar
13 votes
1 answer
1k views

How much mass does the Sun lose as light, neutrinos, and solar wind?

In this answer I estimate the loss of gravitational mass of the Sun to be about 1.3E+17 kilograms per year using $E = m c^2$ and 1360 W/m^2 at 1 AU. While writing that answer I realized that solar ...
uhoh's user avatar
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9 votes
1 answer
386 views

How are neutrinos produced in blazar jets?

I was watching the press release about measuring neutrinos and gamma rays from a distant blazar. One of the presenters mentioned that the neutrinos are associated with very high energy protons caught ...
PSR-1937-21's user avatar
12 votes
1 answer
766 views

What object in the universe is most opaque to neutrinos?

I had this thought, and my first guess was "high density = lots of absorption, so I guess it's neutron stars" but this physics.se question about that has a great answer which covers why that's ...
llama's user avatar
  • 333
5 votes
1 answer
175 views

Star - Black Hole binary. Star core Collapses. Does the black hole immediately grow from neutrinos?

I was reading on how Type II Supernovae release as much as 99% of their energy as neutrinos. So I was thinking: suppose there was a large star and black hole binary system, but the two were not close ...
Broton's user avatar
  • 51
4 votes
2 answers
195 views

How Does IceCube Trace a Neutrino to its Source?

I read the following claim in an article (Lisa Grossman, "Origin of Cosmic Oddities Proposed," Science News, February 17, 2018, 8). ... IceCube has already traced an especially high-energy neutrino ...
euler1944's user avatar
5 votes
1 answer
287 views

Delay between neutrino pulse and visible flash of supernova

If you were orbiting a star undergoing a core-collapse supernova, what would be the delay between the neutrino pulse from the collapse and the first visible effects on the surface? Basically, I'm ...
Colin Paddock's user avatar
12 votes
1 answer
2k views

Do neutron stars shine?

Ignore pulsars and the like, just a neutron star in empty space – does it emit light and neutrinos?
user6760's user avatar
  • 2,501
1 vote
2 answers
171 views

Is there any cosmological evidence that neutrinos travel at a speed other than c?

I've been looking into neutrinos. One thing I'm puzzled about is how fast they travel. See the Wikipedia SN1987A article where you can read this: “approximately two to three hours before the visible ...
John Duffield's user avatar
2 votes
2 answers
179 views

Why do neutrinos take time to scatter?

After a supernova neutrinos get released by electron capture,and they escape in a flood. My guess is because they have tiny masses and get momentum from momentum conservation. However, the huge ...
kingW3's user avatar
  • 465
7 votes
1 answer
938 views

Neutrinos passing through black holes

What would happen to a neutrino that, traveling parallel to the black hole, crossed it's event horizon? Would it come through the other side unaffected? Or, A neutrino and a black hole just happen to ...
Harlemme's user avatar
  • 189
22 votes
1 answer
593 views

Multi-messenger astronomy: what is the potential of simultaneous detection of gravitational waves and neutrinos from a supernova?

Thanks to the efforts of the aLIGO team, gravitational wave astronomy is a reality. At the same time, neutrino detectors like Hyperkamiokande are becoming much more sensitive. My question is: what ...
ProfRob's user avatar
  • 155k
10 votes
2 answers
2k views

Is the earth bombarded equally in all directions by neutrinos?

Perhaps it is hard to known for sure because neutrinos are very difficult to detect, although they do go through the earth in very large numbers. But are they passing through the earth equally from ...
Marijn 's user avatar
  • 1,826
3 votes
1 answer
205 views

Do neutrinos have as much information as photons do?

If neutrino detectors keep improving so that a fair number of neutrinos can be observed, would they be as informative for astronomy as photons are? They are of course a very valuable complement to ...
LocalFluff's user avatar
  • 11.4k
1 vote
2 answers
118 views

Why do we have so few neutrinos to study?

According to Wikipedia most neutrinos passing through the Earth emanate from the Sun. About 65 billion (6.5^10) solar neutrinos per second pass through every square centimeter perpendicular to the ...
questionhang's user avatar
  • 3,137
13 votes
2 answers
789 views

How Are Radioactive Decay Rates Influenced by Neutrinos - On Earth and Other Dense Planets

I read a science report recently that mentioned an accidental discovery where radioactive decay rates shifted slightly slower in advance ( about a day and a half) of solar storms or in sync with sun's ...
Cymatical's user avatar
  • 351
2 votes
1 answer
333 views

Are neutrinos affected by gravity fields?

Am asking if a neutrino can be pull by the gravity field of a quasar or a black hole, assuming the neutrino have momentum. It could be possible in the that a neutrino can orbit a black hole at an ...
Albert00's user avatar
-1 votes
2 answers
265 views

Nuetrino interaction with plasma and electromagnetism [closed]

Following question enter link description here After watching the Thunderbolt Project on Youtube I have a very very very fresh perspective on the universe - the electric universe. From the electric ...
Cymatical's user avatar
  • 351
10 votes
2 answers
161 views

Neutrino interaction with dense molecular structures

Would dense molecular structures on heavier planets (crystalline or other compounds which are generally unknown to us) allow neutrinos to pass through as easily as on Earth?
Cymatical's user avatar
  • 351
15 votes
1 answer
269 views

How Does Cosmology Constrain the Number of Neutrino Species?

I've asked this question already on the Physics SE, but I felt it would be worth posting here as well. I know that based upon theories of structure formation cosmologists can constrain the sum of the ...
astromax's user avatar
  • 5,953