30544
The combination of the energy variation needed to create these particles , and the time during which they exist , fall under the threshold of detectability expressed by the Heisenberg uncertainty relation , Δ " E " " · " Δ " t " " ≥ " " ħ " .
 Heisenberg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Heisenberg