system
Given the following post, respond as if you're commenting on Reddit:
human
They say that to test String Theory, we need to build a particle accelerator as large as out galaxy. Is it a technical limitation or a fundamental one?
gpt
It's a little of both. With how we currently probe high energy regimes, there is a fundamental limit to the energies we can obtain from collisions, related to accelerator designs (including size). But it is, pedantically, a technological limitation, because the science doesn't say "the only way to test string theory is to use your current understanding of accelerator physics to build a very large accelerator," rather it says "if you want to avoid building a very large accelerator, you need a breakthrough in how you probe very high energy regimes."