- #1
jwatts
- 17
- 1
How close could a tachyon get to a black hole and still escape?
bcrowell said:I don't see why #2 and #3 have to be worded so cautiously. I don't think there's that much wiggle room in the properties of tachyons. If they exist, and if Lorentz invariance (LI) holds, then their kinematic properties are fully determined by LI.
PeterDonis said:*Which* spacelike curve will a particular tachyon, emitted at a particular event in a black hole's interior, follow? Kinematics can't tell you that.
bcrowell said:Given the initial spacelike velocity four-vector, there is a unique geodesic tangent to it.
PeterDonis said:*Which* initial spacelike vector? That's what kinematics can't tell you.
For example: I point my tachyon pistol at you. The pointing of the pistol does define a spatial direction. But it doesn't define a unique spacelike vector, because I don't know which surface of simultaneity I should use. Should I use mine? Yours? The simultaneity of the CMBR rest frame? That's what kinematics can't tell you; you need a dynamical theory of tachyons.
PAllen said:The generic dynamical theory of tachyons simply says: for a given local frame, the total energy and invariant (imaginary) mass determine the 4-vector
PeterDonis said:The total energy and invariant mass together don't determine a unique 4-vector. They only determine a particular "mass shell" hyperbola (I put "mass shell" in scare-quotes because the invariant mass is imaginary, as you say, but it works the same as an ordinary mass shell for a timelike object).
PAllen said:I'm speaking of 'classical' tachyons. No such thing as mass shell.
Tachyons are hypothetical particles that travel faster than the speed of light. According to current theories, they would not be affected by the gravitational pull of a black hole and could pass through it without being trapped.
It is believed that tachyons could escape the event horizon of a black hole, as they travel faster than the speed of light and would not be affected by the extreme gravity. However, this remains a topic of ongoing research and debate.
Since tachyons are thought to be unaffected by the gravity of a black hole, they could theoretically get as close as they want without being affected. However, due to the extreme conditions near a black hole, it is difficult to predict the exact behavior of tachyons in this scenario.
It is difficult to say for certain, as tachyons are still a theoretical concept. Some theories suggest that they may be able to pass through the black hole without colliding, while others propose that they could potentially cause a disruption in the fabric of space-time.
According to current theories, a tachyon would not be able to enter the event horizon of a black hole in the first place, as it would already be traveling faster than the speed of light. Therefore, the question of whether it could escape the gravitational pull once inside is not applicable.