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Old Jan 3rd 2010, 07:57 AM   #1
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Question Ultra-relativistic and Quasi-relativistic

Can someone tell me the definition, physical description of the following three words and what are their differences:

Relativistic
Ultra-relativistic
Quasi-relativistic

Thank you very much!
If you have any comments and suggestions, please feel free to contact me via email. nathanzzf AT sina dot com. I am waiting for your advice.
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Old Jan 3rd 2010, 09:29 AM   #2
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detail

maybe i should ask what is the quasirelativistic particle and what is ultrarelativistic particls?

hope someone can give me a reply.

Thanks!
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Old Jan 3rd 2010, 09:17 PM   #3
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The prefix ultra is normally used when some limit is exceeded , like in ultraviolet . So ultrarelativistic should refer to particles with velocities greater than that of light (though forbidden by special relativity, there are references to tachiones etc.)

Quasi relativistic i think would refer to particles which approach relativistic speeds, when effects start to show up, but are not drastically different from non relativistic treatments.

Why dont you buzz pmb? He will definitely give you a clearer picture.
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Old Jan 3rd 2010, 11:26 PM   #4
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Originally Posted by physicsquest View Post
The prefix ultra is normally used when some limit is exceeded , like in ultraviolet . So ultrarelativistic should refer to particles with velocities greater than that of light (though forbidden by special relativity, there are references to tachiones etc.)

Quasi relativistic i think would refer to particles which approach relativistic speeds, when effects start to show up, but are not drastically different from non relativistic treatments.

Why dont you buzz pmb? He will definitely give you a clearer picture.

Hi, physicsquest. Happy New Year.
Sorry, I am a newcomer. Who is pmb? can you give me the link or something?
Thank you very much!
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Old Jan 4th 2010, 04:07 AM   #5
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Thank you and wish you the same. pmb is also one of us who helps out on this forum and has a very good command over relativity and other advanced topics. Please check out the "View forum leaders" link and you will find him there. You can either send him a private message or post in the box which appears when you click on his name.
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