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Andreas_Hansen: PhysLink.com Expert
Andreas Birkedal-Hansen
M.A. Physics
Physics Grad Student
UC Berkeley
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Questions answered
to date:
11
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Biography
Andreas Birkedal-Hansen was born in Copenhagen, Denmark in 1972. He grew up in Denmark and Birmingham,
Alabama. He received a B.A. in mechanical engineering and a B.S. in physics from Georgia Tech at the end of
1996. In 1999, he earned an M.A. in physics from UC Berkeley. He is currently at UC Berkeley working on a Ph.D. in physics.
His studies currently focus on theoretical particle physics, investigating implications for particle physics
from recent and
near-future cosmological data. His research efforts also touch on strengthening the connection between string
theory and low-energy phenomenology through the use of effective supergravity models.
Click here for more information about his research interests. You can get more information about him by visiting: http://www.birkedal-hansen.com
Published Answers
All answers by Andreas Birkedal-Hansen published at PhysLink.com up to date are listed here:
- Theoretically would light infinitely bounce, in a room made of perfect mirrors?
- What exactly is the heat death of the universe and where can I find out more?
- Why is it that when you put your finger over the tip of a hose the water shoots out farther?
- Why isn't the electron considered a black hole? It does have mass and its radius is infinitely small, isn't it?
- If two lasers 1 mile apart and facing each other emitted a pulse of light at the same time surely the relative velocity between these 2 pulses of light would be 2c (c=speed of light). I was under the impression that nothing could exceed the speed of light so what is the true relative velocity between the 2 pulses?
- When high velocity particles travel faster than the speed of light in a medium they create a blue flash. This is called Cerenkov Radiation, why does this happen and why is it blue?
- Why is it easier to accelerate an electron to a speed that is close to the speed of light, compared to accelerating a proton to the same speed?
- Now that the universe is proven flat, what implications does it have on the special theory of relativity, particularly the gravitational aspect?
- How was the critical density of the universe calculated?
- How are solar sails possible? If photons have no mass, how can they push on something?
- When annihilation occurs what happens with the charge of the interacting particles?
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