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Can PCT application based on US provisional patent without claim?

AFAIK, US provisional patent is valid for later use even without any claim, but I heard that some countries require patent having claims. So does PCT application accepts US provisional patent without ...
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Can I file US provisional patent, and publish the invention, then file for PCT after that? For how long can it be legal?

I will file provisional patent, then publish it. Can I file PCT application after that based on US provisional priority date? If yes, what is the maximum time I can have before filing PCT ...
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What is a PCT number?

What does a published PCT number mean exactly? (Of the form PCT/IB2011/nnnnnn). Does it grant any legal/intellectual rights in any way? Does it have any effect in this regard that a WO2013nnnnnnA1 ...
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If I file a provisional patent application, could someone else file a PCT application for the same invention during the first 12 months?

I'm working in a startup with a limited amount of investment. We'd like to file for a US provisional patent. My understanding is that after 12 months, I can upgrade to a PCT application. For this ...
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Rule 131 Antedating for a National Stage application

For the given circumstances: Reference filed on Jan. 1, 2010. PCT Application filed on Feb. 1, 2010. US National Stage claiming priority to the PCT Application filed on Mar. 1, 2010. Reference was ...