Vacuum Repels
General Relativity: both energy and momentum gravitate
  Ñ2 f = 4 p G ( r + 3 p )  .

But vacuum (L) has negative pressure

  pL = - rL  .

Hence vacuum repels.

  If vacuum has negative pressure, why doesn't vacuum suck?

 
First Proof that pL = - rL:
dE + p dV = 0  .
If E = rLV with rL constant, then
( rL + pL ) dV = 0  .
QED.
 
Second Proof that pL = - rL:
The energy-momentum tensor Tmn of vacuum must be proportional to the only available tensor, the metric tensor gmn:
Tmn º æ
ç
ç
ç
è
rL 0 0 0
0 pL 0 0
0 0 pL 0
0 0 0 pL
ö
÷
÷
÷
ø
= rL gmn = rL æ
ç
ç
ç
è
1 0 0 0
0 -1 0 0
0 0 -1 0
0 0 0 -1
ö
÷
÷
÷
ø
 .
QED.

  Why doesn't vacuum suck?