Re: Gravitational interference between parallel paths?

"David Deutsch david.deutsch-LR/[email protected] [Fabric-of-Reality]" <[email protected]> Wed, 19 Nov 2014 09:42:22 +0000
Newsgroups	gmane.science.physics.fabric-of-reality
Message-ID	<[email protected]>
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On 3 Nov 2014, at 12:04, [email protected] [Fabric-of-Reality=
] <[email protected]> wrote:
> 
> To predict the interferen=
ce pattern of a single photon interference experiment then you have to calc=
ulate all the possible paths of all photons.  


Yes.
> In each possible pat=
h, won't the curvature of space time be slightly different due to the diffe=
rent distribution of mass/energy?
> 


Yes.
>  How does this different curva=
ture of space in each path affect the other paths?
> 


It shifts the interf=
erence pattern slightly.


This is related to what happens in the Pound-Rebk=
a experiment: http://en.wikipedia.org/wiki/Pound=E2=80=93Rebka_experiment 
=
>  Is there some kind of gravitational interference between universes? Does=
 this question even make any sense?
> 
> 
'Gravitational interference betwe=
en universes' would mean interference between different states of the gravi=
tational field itself. That is a different issue but presumably happens too=
.


-- David Deutsch
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      <p><br class><div><div class>On 3 Nov 2014, at 12:04, <a href=3D"mail=
to:[email protected]" class>[email protected]</a>=
 [Fabric-of-Reality] &lt;<a href=3D"mailto:Fabric-of-Reality-hHKSG33Tihh9OS/[email protected]=
m" class>[email protected]</a>&gt; wrote:</div><blockquote =
type=3D"cite" class><br class=3D"Apple-interchange-newline"><div class><spa=
n style=3D"word-spacing: normal;" class>To predict the interference pattern=
 of a single photon interference experiment then you have to calculate all =
the possible paths of all photons. &nbsp;</span><br class></div></blockquot=
e><div><br class></div>Yes.<br class><blockquote type=3D"cite" class><div c=
lass><p style=3D"padding: 15px 0px 3px;overflow: hidden;font-family: Monaco=
;font-size: 14px;font-style: normal;font-variant: normal;font-weight: norma=
l;letter-spacing: normal;text-align: start;text-indent: 0px;" class><span s=
tyle=3D"word-spacing: normal;" class>In each possible path, won't the curva=
ture of space time be slightly different due to the different distribution =
of mass/energy? </span></p></div></blockquote><div><br class></div>Yes.<br =
class><blockquote type=3D"cite" class><div class><p style=3D"padding: 15px =
0px 3px;overflow: hidden;font-family: Monaco;font-size: 14px;font-style: no=
rmal;font-variant: normal;font-weight: normal;letter-spacing: normal;text-a=
lign: start;text-indent: 0px;" class><span style=3D"word-spacing: normal;" =
class>&nbsp;How does this different curvature of space in each path affect =
the other paths? </span></p></div></blockquote><div><br class></div>It shif=
ts the interference pattern slightly.</div><div><br class></div><div>This i=
s related to what happens in the Pound-Rebka experiment: <a href=3D"http://=
en.wikipedia.org/wiki/Pound=E2=80=93Rebka_experiment" class>http://en.wikip=
edia.org/wiki/Pound=E2=80=93Rebka_experiment</a>&nbsp;<br class><blockquote=
 type=3D"cite" class><div class><p style=3D"padding: 15px 0px 3px;overflow:=
 hidden;font-family: Monaco;font-size: 14px;font-style: normal;font-variant=
: normal;font-weight: normal;letter-spacing: normal;text-align: start;text-=
indent: 0px;" class><span style=3D"word-spacing: normal;" class>&nbsp;Is th=
ere some kind of gravitational interference between universes? Does this qu=
estion even make any sense?</span></p><div class><br class></div></div></bl=
ockquote>'Gravitational interference between universes' would mean interfer=
ence between different states of the gravitational field itself. That is a =
different issue but presumably happens too.</div><div><br class></div><div>=
-- David Deutsch</div></p>

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