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Hawking radiation,virtual particles & vacuum energy.

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Physicist
Hi ppl,
do u khow about vacuum energy?
I have a doubt on virtual perticles.R they massless?If not how hawking radiation is possible?
Bikerman
Physicist wrote:
Hi ppl,
do u khow about vacuum energy?
I have a doubt on virtual perticles.R they massless?If not how hawking radiation is possible?


You are conflating two separate phenomena. Virtual particles are not massless - they are particles and the equivalent anti-particles with no special properties.
Hawking radiation is another thing entirely, although it does rely on the virtual particle phenomenon.
For a scientific critical look at Hawking Radiation I recommend the paper on my site as a starting point :
PDF Version
http://camres.frih.net/resources/GeneralPhysics/blackholes/hawkingradiation.pdf
HTML Version
http://camres.frih.net/resources/GeneralPhysics/blackholes/hawkingradiation.htm
Physicist
Biker,
Hawking radiation is not different.A particle anti particle pair are created near the event horizon. Ok.. Of of the is sucked by black hole . Another one scape away.And more..But why r u telling they r different?They r related.
You better study this in wikipedia.Ok?
Bikerman
Physicist wrote:
Biker,
Hawking radiation is not different.A particle anti particle pair are created near the event horizon. Ok.. Of of the is sucked by black hole . Another one scape away.And more..But why r u telling they r different?They r related.
You better study this in wikipedia.Ok?


And you had better read what I wrote, which was :
Quote:
Hawking radiation is another thing entirely, although it does rely on the virtual particle phenomenon.

I know the classic theory of Hawking Radiation which is, I think, both oversimplistic and wrong. That is why I gave you a reference to a more considered and less simplistic paper on the subject. Maybe you should read it first and then comment on what I need to study ?
Chris
Physicist
Ok ok biker, u dont need 2 study.U r bigboss.
Anyway plz tell me one thing.Bcoz i hav doubt- when a particle scape away energy hole is created.By quantum tunneling energy comes 4m blackhole 2 fill it.So black lose energy,means mass.Bt my qsn is another particle is fallen.So total energy/mass shd b same.Plz make me clear if u can.Bye
Bikerman
Physicist wrote:
Ok ok biker, u dont need 2 study.U r bigboss.
Anyway plz tell me one thing.Bcoz i hav doubt- when a particle scape away energy hole is created.By quantum tunneling energy comes 4m blackhole 2 fill it.So black lose energy,means mass.Bt my qsn is another particle is fallen.So total energy/mass shd b same.Plz make me clear if u can.Bye


I'm not any sort of boss and I have to study very hard to progress.
Why not read the link I gave?
I'll try to explain one possible method for mass loss using the principle that the escaping particle is accelerated due to the Gravity of the BH.
To show the math I'll have to do it in html and link to it.....
http://camres.frih.net/resources/GeneralPhysics/blackholes/hawkingradiationcalc.htm

OK ?

Now, as I said earlier I personally think this may be wrong, which is why I gave you a link to a more comprehensive treatment of this, but it is one possibility.

Chris.
Physicist
But why one pair is scaping and another is falling.Explain me plz.
And i khew photon is massless but u r telling about their mass! Explain plz.
Oh i hav seen ur profile. U r my senior...
Bikerman
Physicist wrote:
But why one pair is scaping and another is falling.Explain me plz.
And i khew photon is massless but u r telling about their mass! Explain plz.
Oh i hav seen ur profile. U r my senior...


Photons have mass because of their kinetic energy.....relativistic mass. Although the rest mass is 0, the photon is never at rest and, therefore, is deemed to have a relativistic mass all the time.
This is calculated simply as I outlined in my answer...

The photon which is captured obviously gives up the energy it has gained when it joins the singularity but the photon which escapes takes the energy with it and therefore removes it from the BH.

OK ?

Chris
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