Causality calculator

[His Divine Shadow]

http://www.hisdivineshadow.com/misc/causality.asp

I've made a causality calculator, it assumes we can send FTL signals from system to system, this calculator uses the relative velocity of the two systems and speed of the transmission to see wheter there will be a causality violation.

I am not entierly sure about the workings here, since I am a newbie at this, but if you get a negative number as the reply, there will be a causality violation.

However you can only get one of those if the transmission and recieving points are moving towards each other(thats when you use a negative number).
If they move away you use a positive number and you never get a negative number, so either it means you can go infinitely fast if the two locations move away from each other or I have missed something.

[Dalton]

Needs better documentation.

[His Divine Shadow]

Needs better documentation.

Yeah, but I'm concerned about the code and wheter anyone with the know-how can find any faults in it.

[kojikun]

causality can never be violated so long as the time it takes to travel the distance is greater then the time the signal was sent back in time.

[Loki]

Great! Want to explain what causality is for us unenlightened types who don't understand a word of the dictionary definition?

[His Divine Shadow]

Great! Want to explain what causality is for us unenlightened types who don't understand a word of the dictionary definition?

The principle of cause and effect.

This calculator will help you figure out how fast you can send a tachyonic message between two points in space without violating causality(which would mean sending the message back in time, which does not work according to saxton, it'll just generate static if so)

[Batman]

Every time I run across this thread title I read 'casualty calculator' and think WTF?

I need to have some serious words with my subconcious...

[SPOOFE]

Heh... my "casualty calculator" is my Colt .45...

[ClaysGhost]

http://www.hisdivineshadow.com/misc/causality.asp

I've made a causality calculator, it assumes we can send FTL signals from system to system, this calculator uses the relative velocity of the two systems and speed of the transmission to see wheter there will be a causality violation.

What exactly are you calculating with this? Can you be more specific as to the output? I'm worried by the way I can send a signal at many times c between two relatively stationary observers and have no casuality problems.

This calculator will help you figure out how fast you can send a tachyonic message between two points in space without violating causality

I seem to remember seeing a proof that you can't, at least not with the popular imaginary mass tachyons. Two options were available; you could send a local disturbance (message) encoded as IM tachyons, but the message would propagate at subluminal speed. However, superluminal disturbances would be non-local (infinite in extent), so you could never encode a receivable message in the first place.

[His Divine Shadow]

[What exactly are you calculating with this? Can you be more specific as to the output? I'm worried by the way I can send a signal at many times c between two relatively stationary observers and have no casuality problems.

Well at certain speeds there apparently is no causality violation, it only approaches velocites far above C, or so I am told.

I seem to remember seeing a proof that you can't, at least not with the popular imaginary mass tachyons. Two options were available; you could send a local disturbance (message) encoded as IM tachyons, but the message would propagate at subluminal speed. However, superluminal disturbances would be non-local (infinite in extent), so you could never encode a receivable message in the first place.

Hmm, this proof is?

[Crayz9000]

Well, if I put in a signal travelling at 200c and a relative velocity between the two objects of -150c, I get a very small negative result.

Edit: Tried it again, this time with a signal at 100c and a relative velocity of -1. Apparently if the two objects are moving towards each other at a speed faster than light, it results in a casuality violation...

Other than that, I can't get any casuality violations, even if the signal is moving at 1E24 times the speed of light (if the objects are static.)

[ClaysGhost]

Well at certain speeds there apparently is no causality violation, it only approaches velocites far above C, or so I am told.

What exactly does the number the calculator produces correspond to?

Hmm, this proof is?

It involves solution of the Klein-Gordon equation (relativistic generalisation of the Schrodinger equation) for an imaginary mass; the consequences come from that. I'll look it out tomorrow.

[His Divine Shadow]

What exactly does the number the calculator produces correspond to?

Well if the number is negative, there is a causality violation, or so I understood, I provided you with further information of this and the development of this calculator through PM recently

It involves solution of the Klein-Gordon equation (relativistic generalisation of the Schrodinger equation) for an imaginary mass; the consequences come from that. I'll look it out tomorrow.

Maybe by then my brain will have cooled down from reading that.