Is it possible to communicate through an Einstein-Rosen bridge without violating causality?
I suspect that it is possible as long as time dilation occurs during the process of moving one end of the bridge at relativistic speeds as in the following scenario:
Imagine an Einstein-Rosen bridge that...
Well either way there isn't a huge problem here because causality is preserved using this type of FTL communication. For instance, picture the SR twins using this FTL phone. When they are both on Earth with v=0, they can communicate FTL. When one twin starts moving towards a star 10 lyrs away at...
So in any real experiment the non-entangled photons would vastly outnumber the entangled photons. Alice would see 1 for when Bob sends a 1 and 1 99.9% of the time Bob sends 0 making communication impossible. You say the use of a coincidence counter will filter out the entangled particles but...
Thanks for pointing out the vagueness SpectraCat. I think I need to add more detail to this picture. By interferometer I do not mean something like a Fabry-Perot interferometer but something like a double slit experiment. DrChinese thanks for that link. This is precisely what I am talking about...
First, let me point out that this is probably wrong. Anytime I hear faster than light travel I am automatically skeptical. I just haven’t figured out why it’s wrong yet. Any ideas?
1. Two devices situated in between Bob and Alice produce two streams of entangled pairs of qubits. Each pair...
I think you can only measure the relative velocity of an object by measuring frequency. Thats how we know that the further away a galaxy is from us the faster it is moving and thus the universe is expanding. However, in order to measure distance you need light intensity, the inverse square law...
I hear a lot about astronomers using type IA supernovae to accurately measure large scale distances over billions of light years to do things like measure the rate of expansion of the universe. I doubt that the calculation of this distance is simply based on the inverse square law. So my...
I talked to Martin Bojowald today seeing as he would have some knowledge in the matter. I think stevebd1 was getting at the same thing. It's not that the black hole forms as a point at the center of a collapsing star, but rather when some spherical region of space centered at the core has enough...
There are a couple separate things you're mixing up here. First, gravitational waves are what travel at the speed of light. If you have an area of flat space and suddenly introduce a large mass you create a disturbance that propagates away as a gravitational wave. This is like having a long...
Most people on this forum know the basic theory of black hole formation. When a massive star runs out of fuel there is no longer enough heat pressure pushing out against the gravity pulling in and the star collapses. The density of the core and resulting remnant become so large that nothing, not...
At first, wave-particle duality may seem incomprehensible, but if it is real you can comprehend it. Since many experiments have repeatedly verified quantum mechanics, it is very real. Perhaps weird but definitely real.
To understand the answer you have to understand we are talking about a...
That is something like what I got. The units do work out as well. I guess the problem is I asked the question using a helicopter as an example. This is problematic because it's connected to its surroundings via its blades and thus can have arbitrarily high efficiency. I was originally thinking...
This is not my homework this is just a random thought. Say you have a 1 kg helicopter hovering in midair. The question is, given perfect efficiency, how much power is it using to hover?
My approach is to think of the given information first. We know that g= 9.8. So you have a 1 kg mass that...
Thanks ZapperZ, that's some useful info. So what are the BEST known superconductors based on these additional factors? (by best I mean most useful to practical applications)