[Guille]

Originally Posted by Mohan.C Dimensions are human invented. hmmm... I don't think so then it would be much like telling that universe is there because u are there.

The anthropic principle asserts that the universe exists ultimatelly for the existence of humans. I don't believe in it, but it is true that all science is limited to our experiences of the world, and we cannot experience something directly itself, but our perception of it.

Originally Posted by Mohan.C Dimensions are the understanding of human thought. That doesn't mean they are human invented. And yes we can explain the universe in a much simpler way than giving all those extra dimensions. Space time is continous is what i believe but it does become discrete at special circumstances like beginning of the universe and in the singularities.

But I differentiate between natural dimensions and cultural dimensions. Natural dimensions are those like space 3d and time. But cultural dimensiosn are those that arrised from our history: logic is a dimensions, as something can be logical or illogical, but not out of the dimension. Also love, someone can love a lot or little or nothing or everything, but is always in the dimension of love. etz, etz... The probelm if space-time is continuous, what is it, a wave, a field, or simply ios it what matter occupies, in that there is no space-time if there is no matter in a place?

Originally Posted by Mohan.C Do i believe in string i don't know because i don't know anything about it. If you could name a good book i can follow.

I got introduced to it with Brian Greene's The Elegant Universe. A series of documentaries were done and are available on the internet for free 8they are very good, just search on google there is a web with all of them). He has also written The Fabric Of The Cosmos. Another good physicist writing is Michio Kaku. However, I don't believe in string theory (totally: some aprts are very correct).