<s>
Novikov	O
intended	O
it	O
to	O
solve	O
the	O
problem	O
of	O
paradoxes	B-Application
in	O
time	O
travel	O
,	O
which	O
is	O
theoretically	O
permitted	O
in	O
certain	O
solutions	O
of	O
general	O
relativity	O
that	O
contain	O
what	O
are	O
known	O
as	O
closed	O
timelike	O
curves	O
.	O
</s>
<s>
The	O
principle	O
asserts	O
that	O
if	O
an	O
event	O
exists	O
that	O
would	O
cause	O
a	O
paradox	B-Application
or	O
any	O
"	O
change	O
"	O
to	O
the	O
past	O
whatsoever	O
,	O
then	O
the	O
probability	O
of	O
that	O
event	O
is	O
zero	O
.	O
</s>
<s>
It	O
would	O
thus	O
be	O
impossible	O
to	O
create	O
time	B-Application
paradoxes	I-Application
.	O
</s>
<s>
After	O
discussions	O
with	O
the	O
lead	O
author	O
of	O
the	O
1990	O
paper	O
,	O
John	O
Friedman	O
,	O
they	O
convinced	O
themselves	O
that	O
time	O
travel	O
need	O
not	O
lead	O
to	O
unresolvable	O
paradoxes	B-Application
,	O
regardless	O
of	O
the	O
object	O
sent	O
through	O
the	O
wormhole	O
.	O
</s>
<s>
Thorne	O
would	O
refer	O
to	O
this	O
scenario	O
as	O
"	O
Polchinski	O
's	O
paradox	B-Application
"	O
in	O
1994	O
.	O
</s>
<s>
In	O
the	O
revised	O
scenario	O
,	O
the	O
ball	O
from	O
the	O
future	O
emerges	O
at	O
a	O
different	O
angle	O
than	O
the	O
one	O
that	O
generates	O
the	O
paradox	B-Application
,	O
and	O
delivers	O
its	O
younger	O
self	O
a	O
glancing	O
blow	O
instead	O
of	O
knocking	O
it	O
completely	O
away	O
from	O
the	O
wormhole	O
.	O
</s>
<s>
This	O
only	O
applies	O
to	O
initial	O
conditions	O
outside	O
of	O
the	O
chronology-violating	O
region	O
of	O
spacetime	O
,	O
which	O
is	O
bounded	O
by	O
a	O
Cauchy	O
horizon	O
.	O
</s>
<s>
Specifically	O
,	O
it	O
assumes	O
either	O
that	O
there	O
is	O
only	O
one	O
timeline	B-Application
,	O
or	O
that	O
any	O
alternative	O
timelines	O
(	O
such	O
as	O
those	O
postulated	O
by	O
the	O
many-worlds	O
interpretation	O
of	O
quantum	O
mechanics	O
)	O
are	O
not	O
accessible	O
.	O
</s>
<s>
Time-loop	O
logic	O
,	O
coined	O
by	O
roboticist	O
and	O
futurist	O
Hans	O
Moravec	O
,	O
is	O
a	O
hypothetical	O
system	O
of	O
computation	O
that	O
exploits	O
the	O
Novikov	O
self-consistency	O
principle	O
to	O
compute	O
answers	O
much	O
faster	O
than	O
possible	O
with	O
the	O
standard	O
model	O
of	O
computational	O
complexity	O
using	O
Turing	B-Architecture
machines	I-Architecture
.	O
</s>
<s>
A	O
simple	O
example	O
is	O
an	O
iterative	B-Algorithm
method	I-Algorithm
algorithm	O
.	O
</s>
<s>
Deutsch	O
shows	O
that	O
quantum	O
computation	O
with	O
a	O
negative	O
delaybackwards	O
time	O
travelproduces	O
only	O
self-consistent	O
solutions	O
,	O
and	O
the	O
chronology-violating	O
region	O
imposes	O
constraints	O
that	O
are	O
not	O
apparent	O
through	O
classical	O
reasoning	O
.	O
</s>
<s>
Steins	B-Application
;	I-Application
Gate	I-Application
(	O
2009	O
)	O
:	O
Cited	O
by	O
Makise	O
Kurisu	O
during	O
her	O
presentation	O
on	O
time	O
travel	O
.	O
</s>
<s>
Outer	B-Application
Wilds	I-Application
(	O
2019	O
)	O
:	O
A	O
video	O
game	O
involving	O
time	O
travel	O
which	O
does	O
not	O
follow	O
the	O
principle	O
,	O
causing	O
a	O
game	O
over	O
if	O
the	O
player	O
experiments	O
to	O
test	O
it	O
.	O
</s>
