Stack Exchange

Jim

Toronto, Canada, eh?

http://arXiv.org

I'm a cosmologist. I did my undergraduate in space engineering (rocket science) and my graduate degree in cosmology. I enjoy Dark Energy, curvature, and modified gravity, but I mainly focus on inflation.

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Top Questions
Top Answers
80
What technology can result from such expensive experiment as undertaken in CERN?
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71
Why are some people are claiming that the Big Bang never happened?
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70
Why does a bowling ball roll down faster on a slope than a tennis ball, yet both hits the ground at the same time if they're dropped from the rooftop?
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69
Is gravity just electromagnetic attraction?
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55
Why is the sky never green? It can be blue or orange, and green is in between!
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54
Why can Hiroshima be inhabited when Chernobyl cannot?
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52
How fast would someone have to run to travel vertically up a wall?
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43
Cooling a satellite
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40
Build a ring around Earth, then remove the supports
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37
Can a human size object move so fast that it ceases to be observable?
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36
Shine a beam of light horizontally, drop a stone from same height - would both hit the ground at the same time?
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28
What if photons are not the fastest particles?
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25
Why do we need to know the shape of the slide to find the time to slide down it?
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24
Contradiction between law of conservation of energy and law of conservation of momentum?
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23
Can a mouse rotating a wheel violate conservation of angular momentum?
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22
Does General Relativity imply loops in space?
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22
Minkowski Metric Signature
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22
Why is jumping into water from high altitude fatal?
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20
Three polarizers, 45° apart
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19
Can an object falling in vacuum generate electricity by itself?
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18
What is the evidence for a supermassive black hole at the center of Milky Way?
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18
Rocky Planet in the center of System
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17
Direction of angular velocity
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17
Is the Big Bang defined as before or after Inflation?
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15
How many more galaxies are out there in the Universe (beyond the observable radius)?
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15
Why is the sky dark at night?
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14
If two particles are entangled and you collapse the wave function of one of the particles. Does the other particle collapse as well?
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14
Why don't we see solar and lunar eclipses often?
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14
Does everything orbit around some universal “center of mass”?
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14
Do quasars exist today?
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