For decades it was baffling. Out of the still night sky, astronomers peering through their telescopes would occasionally glimpse quick bursts of high-energy light popping off like flashbulbs at the far side of the universe. These bursts seemed impossibly powerful: to appear so bright from so very far away, they must vastly outshine entire galaxies [...]
Archive for the ‘Astronomy & Cosmology’ Category
Short Gamma-ray Bursts
Posted in Astronomy & Cosmology, tagged GRB on October 20, 2008 | 1 Comment »
Gravitational fields as generalized string models
Posted in Astronomy & Cosmology, Physics, String theory, tagged Gravity, strings on September 29, 2008 | Leave a Comment »
This week a paper puplished arxiv titled :Gravitational fields as generalized string models We show that Einstein’s main equations for stationary axisymmetric fields in vacuum are equivalent to the motion equations for bosonic strings moving on a special nonflat background. This new representation is based on the analysis of generalized harmonic maps in which the [...]
Listen to the echo of Big Bang
Posted in Astronomy & Cosmology, tagged Big Bang, CMB on August 9, 2008 | 2 Comments »
The Big Bang theory predicts that the early universe was a very hot place and that as it expands, the gas within it cools. Thus the universe should be filled with radiation that is literally the remnant heat left over from the Big Bang, called the “cosmic microwave background radiation”, or CMB. In 1965, two [...]
Gravitational Wave : What is It ?
Posted in Astronomy & Cosmology, Physics, tagged Astronomy, Gravitational waves, Video on August 5, 2008 | 1 Comment »
Gravitational wave is a prediction of Einstein’s General Relativity . Gravitational waves are disturbance in curvature of space-time caused by the motions of matter and they propagate as a wave, traveling outward from a moving object or system of objects. Important examples of systems which emit gravitational waves are binary star systems, where the two [...]
