Question What is a Neutrino?

[Harry Costas]

What is a Neutrino?
Is it important?
Does it take part in the workings of the Universe?

 

[Harry Costas]

If it is so hard to see, why even research Neutrinos?

Submitted on 16 May 2025]

Flavor Equilibration of Supernova Neutrinos: Exploring the Dynamics of Slow Modes​

Ian Padilla-Gay, Heng-Hao Chen, Sajad Abbar, Meng-Ru Wu, Zewei Xiong

Flavor Equilibration of Supernova Neutrinos: Exploring the Dynamics of Slow Modes

Neutrinos experience collective flavor conversion in extreme astrophysical environments such as core-collapse supernovae (CCSNe). One manifestation of collective conversion is slow flavor conversion (SFC), which has recently attracted renewed interest owing to its ubiquity across different...

arxiv.org

 

[Harry Costas]

Anton is sharing his knowledge.

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[Harry Costas]

simple info

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[Harry Costas]

Are we wasting our research on a particle that can hardly be observed?​

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General Relativity and Quantum Cosmology​

[Submitted on 18 May 2025]

The role of non-metricity on neutrino behavior in bumblebee gravity​

Yuxuan Shi, A. A. Araújo Filho

Within the context of bumblebee gravity, this work explores how non-metricity alters the behavior and propagation of neutrinos. Our analysis is based on the black hole configuration introduced in Ref. [1], focusing on how the spacetime deformation affects some neutrino-related processes. Three primary aspects are fundamentally taken into account: the modification in the energy deposition rate stemming from neutrino-antineutrino annihilation, the alterations in the oscillation phase caused by the background geometry, and the role of lensing effects on the transition probabilities among neutrino flavors. Complementing the analytical approach, numerical evaluations of oscillation probabilities are performed within a two-flavor scenario, accounting for both inverted and normal mass ordering configurations.

 

[Harry Costas]

The next few weeks of info will hopefully show the importance of Neutrinos.

[Submitted on 19 May 2025]

Cluster optical depth and pairwise velocity estimation using machine learning​

Yulin Gong, Rachel Bean

Cluster optical depth and pairwise velocity estimation using machine learning

We apply two machine learning methods, a CNN deep-leaning model and a gradient-boosting decision tree, to estimate individual cluster optical depths from observed properties derived from multiple complementary datasets. The models are trained and tested with simulated N-body derived halo...

arxiv.org

 

[Harry Costas]

Yep, the search is on.


[Submitted on 20 May 2025]

The dynamics of the parsec-scale jet in the neutrino blazar PKS 0735+178​

Yu-Sik Kim, Jae-Young Kim

Recent studies of individual track-like TeV-PeV IceCube neutrino events suggest that strongly jetted AGNs, blazars, can be plausible sources of extragalactic high-energy neutrinos. Although the broadband emission and neutrinos from such blazars can be modeled by hadronic jets with inverse Compton processes, various models show degeneracies. One of the reasons is the lack of high-resolution observations pinpointing the location and physical conditions of neutrino-emitting plasma. Here, we present a VLBI study of PKS 0735+178 that was recently associated with a high energy neutrino event IceCube-211208A (IC211208) as well as alerts from other neutrino observatories. We analyzed publicly available VLBA 15 and 43 GHz data of 0735+178 during 2020-2024, resolving the mas-scale jet and tracing its time evolution in flux and structure, before and after IC211208. We find significant enhancements in the radio flux density, apparent brightness temperature, and synchrotron opacity at 15-43 GHz of the VLBI nuclear region after IC211208, strengthening the temporal correlation between 0735+178 and IC211208. Furthermore, we find that the source ejected a new VLBI component C2 from the VLBI core before IC211208. C2 traveled further downstream at ~4.2c apparent speed, close to the historical maximum speed for this object. C2 then passed a subluminally moving feature in the jet C1 located at ~0.13 mas (~0.77 pc) downstream the core at the time of IC211208. The time of this apparent passage is statistically coincident with the time of IC211208 within 1sigma uncertainty, suggesting the location of this apparent passage to be a probable spatial origin of IC211208. We discuss the physical implications of these findings.

 

[billslugg]

The great thing about studying neutrinos is they can go through anything. If your neutrino source sets in the west, just keep on looking, the neutrinos don't know the Earth is in the way. Just a bit of haze to them. Now, a few light years of lead would give them pause, but a measly planet? No way. The advantage of this is we can use neutrinos to see inside places we can't normally go, like inside a supernova.

 

[promytius]

Yes neutrinos are important and have always been found throughout the universe in a very active way. They're small, but they are also made of more than one thing, so they are not the smallest bit by any means.

 

[Astraeus]

Neutrinos are indeed unique—and perhaps not in the way we often assume.

A more revealing question might be:

Are neutrinos ever created as standalone identities, or are they always byproducts?

If they’re always emitted, not formed as bound entities, what does that say about their nature?

We know photons are massless and always travel at the fastest rate a domain can convey contrast. Neutrinos, meanwhile, appear to oscillate between flavors, which we’ve interpreted as evidence of mass.

But what if this oscillation isn’t mass at all? What if it’s a signature of recursive phase drift—a domain-dependent emission reprojecting itself rhythmically through space, not persisting as a stable identity?

In this view, neutrinos and photons aren’t particles in the conventional sense. They’re recursive phase emissions—expressions of structural transitions that ripple through the domain. They don’t carry energy like electrons do; instead, they induce energy through interaction. Photons lens around gradients, delivering contrast. Neutrinos pass through nearly everything, interacting only when phase conditions align precisely.

Even redshift might need rethinking: Their "energy loss" may not be loss at all, but the changing resonance between emitter, medium, and observer—signals changing as they move through the domain’s rhythm.

Neutrinos don’t quite fit. And maybe that’s why we need to start asking different questions.

 

[Harry Costas]

Thank you for the input.
People who come to the forum will learn more about Neutrinos

 

[Harry Costas]

Just searching for the Research into Neutrinos.

[Submitted on 23 May 2025]

SN 2023gpw: exploring the diversity and power sources of hydrogen-rich superluminous supernovae​

Tuomas Kangas, Panos Charalampopoulos, Takashi Nagao, Lin Yan, Maximilian Stritzinger, Steve Schulze, Kaustav Das, Nancy Elias-Rosa, Christoffer Fremling, Daniel Perley, Jesper Sollerman, Tomás Müller-Bravo, Lluís Galbany, Steven L. Groom, Claudia Gutiérrez, Mansi Kasliwal, Rubina Kotak, Russ Laher, Peter Lundqvist, Seppo Mattila, Roger Smith

SN 2023gpw: exploring the diversity and power sources of hydrogen-rich superluminous supernovae

We present our observations and analysis of SN~2023gpw, a hydrogen-rich superluminous supernova (SLSN~II) with broad emission lines in its post-peak spectra. Unlike previously observed SLSNe~II, its light curve suggests an abrupt drop during a solar conjunction between $\sim$80 and $\sim$180~d...

arxiv.org

 

[Harry Costas]

LHC may give us more info on Neutrinos.


[Submitted on 23 May 2025]

Neutrino Physics at Future Colliders​

P. S. Bhupal Dev

This is a brief review of the collider phenomenology of neutrino physics. Current and future colliders provide an ideal testing ground for (sub)TeV-scale neutrino mass models, as they can directly probe the messenger particles, which could be either new fermions, scalars, or gauge bosons, associated with neutrino mass generation. Moreover, the recent observation of TeV-scale neutrinos produced at the LHC offers new ways to test the limits of the Standard Model and beyond.