Do Antitachyons Travel Slower Than Light?

  • Thread starter Thread starter skywolf
  • Start date Start date
skywolf
Messages
81
Reaction score
0
if a tachyon travels faster than the speed of light would an antitachyon travel slower?
 
Physics news on Phys.org
A tachyon defines all FTL particles, not a specific particle.

If you were to define "anti-tachyons", they would simply be our garden-variety STL electrons, protons, neutrons etc.
 
skywolf said:
if a tachyon travels faster than the speed of light would an antitachyon travel slower?

I see your point; if the antiparticle of the electron (travelling slower than light on a timelike worldline) travels "backward in time" (according to Feynmann) i.e. FTL on a spacelike worldline, then it is a tachyon and its antiparticle is the timelike electron.

People keep telling us the "backward in time" is just notational; the difference between the electron wave function and the positron wave function in QED can be expressed by putting in t -> -t. So I don't think you can push this statement to draw conclusions from it.

The positron is visibly a real particle that leaves timelike tracks in detectors.
 

Thread 'Describing the Big Bang'

I started reading a National Geographic article related to the Big Bang. It starts these statements: Gazing up at the stars at night, it’s easy to imagine that space goes on forever. But cosmologists know that the universe actually has limits. First, their best models indicate that space and time had a beginning, a subatomic point called a singularity. This point of intense heat and density rapidly ballooned outward. My first reaction was that this is a layman's approximation to...
View full post »
Thread 'Dirac's integral for the energy-momentum of the gravitational field'

Thread 'Dirac's integral for the energy-momentum of the gravitational field'

See Dirac's brief treatment of the energy-momentum pseudo-tensor in the attached picture. Dirac is presumably integrating eq. (31.2) over the 4D "hypercylinder" defined by ##T_1 \le x^0 \le T_2## and ##\mathbf{|x|} \le R##, where ##R## is sufficiently large to include all the matter-energy fields in the system. Then \begin{align} 0 &= \int_V \left[ ({t_\mu}^\nu + T_\mu^\nu)\sqrt{-g}\, \right]_{,\nu} d^4 x = \int_{\partial V} ({t_\mu}^\nu + T_\mu^\nu)\sqrt{-g} \, dS_\nu \nonumber\\ &= \left(...
View full post »

Thread 'A sufficient condition for integrability of equation ##\nabla g=0##'

In Philippe G. Ciarlet's book 'An introduction to differential geometry', He gives the integrability conditions of the differential equations like this: $$ \partial_{i} F_{lj}=L^p_{ij} F_{lp},\,\,\,F_{ij}(x_0)=F^0_{ij}. $$ The integrability conditions for the existence of a global solution ##F_{lj}## is: $$ R^i_{jkl}\equiv\partial_k L^i_{jl}-\partial_l L^i_{jk}+L^h_{jl} L^i_{hk}-L^h_{jk} L^i_{hl}=0 $$ Then from the equation: $$\nabla_b e_a= \Gamma^c_{ab} e_c$$ Using cartesian basis ## e_I...
View full post »

Similar threads

I Light Speed in Dense Medium: Explained
Replies
1
Views
2K
B Let me ask a thing about the Speed of Light
Replies
6
Views
1K
B Do photons travel instantaneously?
Replies
41
Views
5K
B c^2 in Einstein‘s theory of relativity
Replies
10
Views
1K
B Does Time Move Slower for Travelers in Special Relativity Experiments?
Replies
29
Views
3K
B Time Dilation: How Does Speed Affect Aging?
Replies
10
Views
6K
B Can Curved Spacetime Enable Faster-Than-Light Travel?
Replies
12
Views
3K
I Another Time Dilation Question
Replies
23
Views
3K
B Time Travel: Can Humans Go Faster Than Ordinary Speed?
Replies
9
Views
2K
I What was the role of frequency in the Michelson-Morley experiment's null result?
Replies
3
Views
1K

Hot Threads

Recent Insights

Back
Top