<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">I think it’s totally possible to travel faster than light without traveling faster than time. <div><br></div><div>Sure you could see light from the past, but we do that all the time. <br><br><div dir="ltr">SR Ballard</div><div dir="ltr"><br><blockquote type="cite">On Sep 2, 2021, at 5:44 PM, Adrian Tymes via extropy-chat <extropy-chat@lists.extropy.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr"><div dir="ltr">On Thu, Sep 2, 2021 at 2:26 PM Ben Zaiboc via extropy-chat <<a href="mailto:extropy-chat@lists.extropy.org">extropy-chat@lists.extropy.org</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<blockquote type="cite">On
Thu, 2 Sept 2021 at 18:02, Adrian Tymes via extropy-chat<br>
<<a href="mailto:extropy-chat@lists.extropy.org" target="_blank">extropy-chat@lists.extropy.org</a>>
wrote:<br>
><br>
<snip><br>
> But clearly it is not time travel</blockquote>
<p>So Adrian, are you saying that FTL flight wouldn't involve
time-travel?</p></div></blockquote><div>I am saying that it doesn't necessarily involve time travel. There may be certain versions that might involve it, but there exists at least one version that does not. </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>
<p>I thought that under certain circumstances it would (specifically
FTL travel to a location that was accelerating away at a
significant rate relative to the point of departure, then FTL
return. I think). Or is there no problem, and it's just the simple
fact that nothing with mass can travel at, or faster than,
light-speed that stops us being able to do it? (and tricks like
Acubierre Drive, if it could exist, would work without causing
paradoxes)?</p></div></blockquote><div>The latter. Normal acceleration beyond light speed might cause it, but is impossible, so it doesn't matter what the math says if it were - and even if it were possible, it would not be the only way. As you note, there exist tricks to get around the limit, and said tricks also (so far as we currently know) cut off the potential for time travel.</div><div><br></div><div>Thus: not all forms of FTL that are possible, cause time travel. It may be that no forms of FTL that are possible, cause time travel, but I have not yet done that analysis.</div><div><br></div><div>The matter at hand was the objection that FTL always causes time travel, which I believe is not a true claim.</div></div></div>
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