Sorry, no online dictionaries contain the exact phrase boundary theory.
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Reverse dictionary results:
1. rule
 2. confine
3. confines
4. confining
5. form
6. outline
7. outlined
8. deep
9. quantum
10. area
 11. coast
12. define
13. defined
14. demarcation
15. fold
16. frontier
17. frontline
18. limitation
19. limiting
20. line
 21. margin
22. partition
23. screen
24. short
25. shorts
26. circuit
27. cover
28. division
29. draw
30. fence
 31. front
32. fronting
33. graduation
34. limes
35. limit
36. mark
37. round
38. rounds
39. side
40. spill

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You can look up the words in the phrase individually using these links:   boundary ?   theory ?
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