Null energy condition

  • Thread starter touqra
  • Start date
284
0
What is null energy condition?
I'm not sure whether this is the right forum to post but I come across this word when reading article about wormholes.
 

hellfire

Science Advisor
1,047
1
The null energy condition means that:

[tex]T_{\mu \nu} A^{\mu} A^{\nu} \geq 0[/tex]

With A a null vector. For a perfect fluid, it can be proven that this implies:

[tex]\rho + p \geq 0[/tex]

I think that for [tex]\inline{\rho > 0}[/tex], the violation of the NEC is equivalent to a violation of the DEC (dominant energy condition). A perfect fluid that violates the DEC has faster than light effects, see https://www.physicsforums.com/showthread.php?t=78361
 

Related Threads for: Null energy condition

  • Posted
Replies
2
Views
3K
Replies
1
Views
2K
Replies
0
Views
1K
Replies
4
Views
2K
Replies
17
Views
2K
Replies
0
Views
2K
Replies
11
Views
3K

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top