A discussion of 'Tachyons, the 4-momentum ...'

Liste des GroupesRevenir à p relativity 
Sujet : A discussion of 'Tachyons, the 4-momentum ...'
De : hitlong (at) *nospam* yahoo.com (gharnagel)
Groupes : sci.physics.relativity
Date : 03. Oct 2024, 11:10:06
Autres entêtes
Organisation : novaBBS
Message-ID : <7b7801803ba85c52030404bcf149487d@www.novabbs.com>
User-Agent : Rocksolid Light
In DOI: 10.13189/ujpa.2023.170101, Figure 4 depicts a thought
experiment involving FTL communication.  This figure is
attached to this post.  We, the viewers, are at rest with
observers A and B.
At event E1, observer A, at x = 0, t = vL/c^2, sends an
infinitely-fast tachyon signal to observer B, who receives
it at x = L, t = vL/c^2.  B immediately passes it to D, who
is moving at velocity v.  D's clock reads t' = 0.
D is now going to send it to C.  The question is, where is
C?  Is C at x = 0 or is C at x = Lv^2/c^2?  According to
us (the viewers), C is at x = Lv^2/c^2, but if we (the
viewers) switched frames so we're at rest with C and D,
(see Figure 5 in DOI: 10.13189/ujpa.2023.170101).  Now,
it appears that D can send a signal to c at t' = t = 0
(infinitely-fast).
But according to our (the viewers) present position in
Figure 5, A (at t = 0) could only send the original signal
to B, who would receive it at t = vL/c^2, or the loop
would not be completed (because of the relativity of
simultaneity).
Let's move back to Figure 4.  So in order to complete
the loop, D must send the signal to where C is not (at
t = 0, x = 0), which flouts RoS.  But at t = vL/c^2, C
is not adjacent to A, so no closed loop can be completed
in this scenario.
Comments, Prok?

Date Sujet#  Auteur
3 Oct 24 * A discussion of 'Tachyons, the 4-momentum ...'13gharnagel
3 Oct 24 +- Re: A discussion of 'Tachyons, the 4-momentum ...'1Maciej Wozniak
3 Oct 24 +* Re: A discussion of 'Tachyons, the 4-momentum ...'7Richard Hachel
3 Oct 24 i`* Re: A discussion of 'Tachyons, the 4-momentum ...'6gharnagel
3 Oct 24 i `* Re: A discussion of 'Tachyons, the 4-momentum ...'5Richard Hachel
4 Oct 24 i  `* Re: A discussion of 'Tachyons, the 4-momentum ...'4gharnagel
4 Oct 24 i   `* Re: A discussion of 'Tachyons, the 4-momentum ...'3Richard Hachel
4 Oct 24 i    `* Re: A discussion of 'Tachyons, the 4-momentum ...'2gharnagel
4 Oct 24 i     `- Re: A discussion of 'Tachyons, the 4-momentum ...'1Richard Hachel
5 Oct 24 `* Re: A discussion of 'Tachyons, the 4-momentum ...'4gharnagel
5 Oct 24  `* Re: A discussion of 'Tachyons, the 4-momentum ...'3Richard Hachel
6 Oct 24   `* Re: A discussion of 'Tachyons, the 4-momentum ...'2Python
6 Oct 24    `- Re: A discussion of 'Tachyons, the 4-momentum ...'1Maciej Wozniak

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