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Mar
8
comment Anticlock wise nature of motion of planets and electrons.
What does it mean to say electrons move in some direction around a nucleus?
Mar
8
comment Can I blow soap bubbles (of air) inside a vacuum chamber?
The bubble would have to be blown, so wouldn't there be increased pressure inside?
Mar
8
comment Can I blow soap bubbles (of air) inside a vacuum chamber?
That's pure water. Does a dissolved detergent change the phase diagram?
Feb
3
comment Gravitational waves: novel or confirmatory?
I assumed the rumor was that they had made a 5-sigma type of discovery, not just a single detection on one detector. I read it on lubos motl site...but no details. I'll continue to spread this rumor until I find out the facts.
Feb
2
comment Gravitational waves: novel or confirmatory?
My impression was that if the waves are not consistent with GR, they will not be detectable with the equipment and algorithms they are using. In other words, something other than than what GR predicts will be filtered out. Perhaps not...
Feb
2
asked Gravitational waves: novel or confirmatory?
Dec
20
comment Theoretical limit to gravity detection?
Thank you. I thought I remembered reading something by Alex Vilenkin about how there is a limit to the fine-grainedness--and therefore the number of possible states--of the universe, as a result of the HUP. Would this not place a limit on the minimum defection of a needle that could be in principle detected, for example?
Dec
19
asked Theoretical limit to gravity detection?
Sep
26
comment Would a tachyon be able to escape a black hole?
I presume they would be constrained by the black hole, but the tachyon horizon would be further "in" than the photon horizon.
Sep
26
asked Would a tachyon be able to escape a black hole?
Aug
11
comment If an event happens 10 light years away and we observe it here, did it actually happen 10 years ago?
It's not just events that are light years away. If I see someone do something across the room, I'm seeing it after it actually happened because it took a small but finite amount of time for the light to reach me.
Jul
12
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Jul
3
awarded  Popular Question
Jun
28
comment Can gravity in principle be made to flow through a “wire”?
Thank you. Is there a way to posit mathematically "negative mass" and model in a theory whether gravity could then be made to flow, if negative mass existed? Don't tachyons have negative mass (excluding the question of whether or not they can actually exist).
Jun
28
comment Can gravity in principle be made to flow through a “wire”?
I see your point but thats not really what I meant. I don't have the physical sophistication to say precisely why it isn't. What I'm imagining is a large mass in region one transmitting its gravitational potential (or its gravity, however it should be phrased) to another region and making, for example, water fall 100 miles away.
Jun
28
asked Can gravity in principle be made to flow through a “wire”?
Jun
21
asked Does a laser beam generate an equal and opposite force
Jun
1
awarded  Notable Question
May
11
awarded  Popular Question
May
7
asked Could there be a dark matter planet?