Department of Mathematics  
Seminars  
Address: Mathematics
25337

Caltech

Pasadena,
CA 91125
Telephone: (626) 3954335  Fax: (626) 5851728 
Project MATHEMATICS!  Caltech Home 
Mathematics
Colloquium
2013  2014 
Tuesday,
January
21, 2014 4:00 p.m. // 151 Sloan Clifford Taubes (Harvard)  What we know and don't know about 4dimensions Abstract: What with the 3spatial dimensions and then time, our observable universe can be viewed as a 4dimensional space. Astronomers seek to understand the large scale structure of this particular 4dimensional space. A mathematical question asks for the list of all possible 4dimensional spaces. I hope to give a sense for what we know and don't know about such a list. 
