Neutrino flux at event horizon

In summary, the conversation discusses the potential mass of a black hole with a certain size event horizon and the amount of neutrino flux that could contribute to its accretion. The estimated mass of the black hole would only increase by 238 grams, showing that the neutrino mass is irrelevant in this scenario. The speaker also mentions that the values used could be inaccurate and that the neutrino flux may be smaller if not near a star. Overall, the conclusion is that the mass of neutrinos is not significant in the accretion of black holes.
  • #1
corbymite
Hi, Assuming an average Neutrino mass of 2.0 Electron volts how much mass will a black hole with an event horizon the size of the one at the center of our galaxy accrete in a year? I've seen estimates of how many Neutrinos pass through our bodies each second and it seems like the mas would really add up over the surface area of a black hole.

Cheers,
Corby
 
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  • #2
What do you get if you take this neutrino flux and multiply it with the black hole cross section? Compare it to the mass of the black hole.

2 eV is above the limits from cosmology, by the way. Stellar neutrinos will have most of their energy as kinetic energy and the neutrino mass is irrelevant for them.
 
  • #3
OK use .2 Electron volts, a radius of 13 million kilometers, and an area of 2.12E+17 square Centimeters. If the Neutrino flux is say 1E+11 per square Centimeter then the total Neutrino flux would be 2.12E+28 per second or 6.68E+35 per year. Looks like this only would increase the black holes mass by 238 grams! Of course my values could be way off?
 
  • #4
The neutrino flux is smaller if you are not near a star, but the neutrino energies are higher. Anyway, the mass is completely negligible, even 20 orders of magnitude more wouldn't have a notable effect.
 

Related to Neutrino flux at event horizon

1. What is a neutrino flux?

Neutrino flux refers to the number of neutrinos passing through a specific area in a certain amount of time. It is measured in units of particles per square meter per second.

2. How is neutrino flux at the event horizon calculated?

The neutrino flux at the event horizon is calculated using the equation F = L/4πr^2, where F is the flux, L is the luminosity of the source, and r is the distance from the source to the event horizon.

3. What is the significance of studying neutrino flux at the event horizon?

Studying neutrino flux at the event horizon can provide valuable information about the properties and behavior of black holes. It can also help us better understand the processes happening at the event horizon and in the surrounding environment.

4. How does the neutrino flux at the event horizon differ from other regions?

The neutrino flux at the event horizon is significantly higher than in other regions due to the extreme gravitational forces and intense radiation present at the event horizon of a black hole.

5. Can neutrino flux at the event horizon be directly observed?

Currently, neutrino flux at the event horizon cannot be directly observed due to the difficulty in detecting neutrinos. However, scientists are working on developing new technologies and methods to potentially detect this flux in the future.

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