Ok, now I understand. You appeared as the natural CEO, and one of the tech guys wants to be CEO and did what is necessary to get the job. You should have known this question should be decided very early when creating a startup. But it is the past, and you can't change it.
So it is only a question of power. Who has the big balls/cojones/chutzpah/whatever. Now the answer seems quite clear to me: you have the biggest, and you don't know it yet. Here is why: if the wannabe CEO really had big balls, he wouldn't act like this. Creating the startup without you is not the sign of the badass, it's is the sign of the weakest. And if you knew you are stronger than him, you wouldn't need to post here for advice.
You are strong because you think you could be the CEO. And now you are stronger because they made a big fault. They can't be trusted because they are not honest. And they are easy to manipulate because they proved they are weak. As soon as this affair becomes public, they are done. Knowing the facts, anyone having relationship with them can have only two attitudes: not trusting them, or taking advantage of them. No partnership can be made, and nobody will help them.
Now, you have many choices, depending on your personality and will. You can talk to them and convince them they can't succeed without you (this is certainly true). You may forgive, take the CEO position, and run the company. In this scenario, you can be sure your authority is granted, but they will never be your friends anymore.
If they refuse to talk, you can create the company on your own: they abandoned you in the middle of your project, your idea, but you have nearly everything: business plan, business model, pitch, contact with incubator... you just need a tech co-founder. If the incubator does not know you are aware of their plans, you can simply talk to your contact and tell him your co founders disappeared but you still want to create the company... it may have a stunning effect :)
You can talk about this story to everybody, blog it, tweet it. You are a founder and your tech co-founder gave up and you still want to create your company. You did nothing wrong, so you can play the buzz and hype card. They cheated, so the must stay in the dark. Noise is good for you, bad for them. Their PR policy can be only "no comment".
Last but not least, you have another choice: giving up. After all, if you give up now, you essentially lost half a year. Probably not completely because you learned many interesting things. Whereas fighting against your ex-co-founders will be a real and tough fight. It will be long and results are not guaranteed. It's up to you. You certainly can afford to loose this personal investment if you give up now, and this fight can be won if you really work hard for it. It's a difficult choice.