Wednesday, April 29, 2009

Most distance object seen in Universe


The most distant object seen in universe was detected in April 23 by NASA Swift satellite.
A Gamma ray burst detected in redshift of 8.2 is the farthest object ever seen.
GRB 090423 was seen when it is about 630 million years after big-bang!!!
read the news here.

Sunday, April 5, 2009

Physics and dimensions


Why physics is so much bizarre in different dimensions.

Starting the course of galactic dynamics in SUT we start to take a look to Poisson equation in two and three dimensions.It is interesting that the dimensionality effect so much on physics of gravitation. A test particle in a 3 dimensional symmetric sphere feels no force.But in 2 dimensions from a homogeneous ring exerts gravitational force on a test particle just because of dimensionality!!
Consequently one can I ask why we are living in 3+1 extended/for believers of higher dimension/ dimensions.Is there any fundamental physical reason behind it?