>>balsam+13
No, it's philosophy. I believe theoretical physics and math are special, as you recognize, because they need a lot of additional vetting. My work is mostly in formal philosophy, which does involve a bit of math, and I'm constantly worried the reviewers might not spot a mistake and send it to colleagues for additional checking. This must be a hundred times more pressing in math and physics, so they developed open archives. As for CS, the reason for more open access archives may be a bit different. My personal impression from reading many CS papers is that 90% of publications are garbage whose only purpose is to satisfy some publication requirements. There is also a lot of repetition by authors. That's in my view understandable since many funding authorities also expect fancy prototype systems and concrete implementations, and computer scientists have only 7 days a week to achieve all this. So in CS hurdles for publication are kept low by having a lot of proceedings and open access journals and archives.