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Who said the fourth Dimension has to be time? 
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#19
Apr413, 06:49 PM

P: 784




#20
Apr413, 06:58 PM

P: 8

Thanks a lot for the hint, really helpful! 


#21
Apr413, 10:00 PM

P: 39

Okay, I did not read every posting here but there should be something clarified: There is a pretty big difference between the four dimensions of SRT (and GRT): You can call the four x_i, x_j, x_k and x_m, but I am not sure why in this thread it is not told that  let us say x_m is the time  the light sphere is (x_i)^2+(x_j)^2+(x_k)^2=(x_m)^2? You can reorder and call it whatever you want  but the "time dimension" is not the same a space dimension?! You should clearly point that out.



#22
Apr513, 01:43 PM

P: 148

Whoever told you this nonsense is most likely not a physicist, is not educated, is making things up and is lying to you. It doesn't make sense for a dimension to contain anything. A dimension is a degree of freedom. Unlearn what this person had taught you. You need to be more careful when learning physics. Don't just trust any information anyone gives you. Do your research to see if they actually are a physicist. 


#23
Apr513, 04:11 PM

P: 853

It actually doesn't matter who tells you what all it matters is are you being told the truth or lies easy as that.
ofcourse it is easier to learn in sites like this one where there are people who sort out fake things but it's not like everyone needs a Phd to understand or be qualified to open his mouth. As long as the person is right it's ok.But just as every teacher also every student or self taught especially has the responsibility not only to demand and seek information but to also check the validity of it. Even professors can get things wrong or messed up we all are just humans you know. But believe me and I can assure you both Gacha and others the one who seeks always finds.It jst is like that. Now in the end of the day most of the time when one gets something wrong it's not because he would have been deliberately tough wrong rather it was his or hers choice to follow up some explanations that are not right. i know many crackpots who have actually some pretty good skills and thinking they just reject the reality because they like what they make up more than what someone else has validated and experimented. The things that we like an accept are the ones that make us who we are. 


#24
Apr513, 04:17 PM

Mentor
P: 17,526

OK, I think that this thread has outlived its usefulness. The idea of time as the fourthdimension comes from special relativity. It is incredibly wellvalidated experimentally:
http://www.eduobservatory.org/physi...periments.html If you have followup questions about relativity, please post them to the relativity forum. The idea of more than 3 spatial dimensions is associated with string theory and its spinoffs. If you have followup questions about that, please post them to the beyond the standard model forum. Be sure and read the sticky before posting there. That forum is not for personal theories. 


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