Question about R.Brandenerger's talk at KITP workshop on singularities

[melroysoares@hotmail.com]

Hi
I was going through R. Brandernberger's talk at the KITP workshop on
singularities which is at
http://online.kitp.ucsb.edu/online/singular_m07/brandenberger/
One thing he said somewhere in teh middle is that Eternal inflation
does not obey Bianchi identities.
This is something I am hearing for the first time. Can someone(esp.
Steve Carlip, John Baez, Ted Bunn, or
anyone else) confirm if this is really true ,or is it just that I was
misinterpreting what Robert said). If so
can someone point me to a paper(where this is discussed) or a simple
way in which this can be seen?

[ebunn@lfa221051.richmond.edu]

In article <1169854955.877747.18020@a75g2000cwd.googlegroups.c om>,
<melroysoares@hotmail.com> wrote:
>Hi
>I was going through R. Brandernberger's talk at the KITP workshop on
>singularities which is at
>http://online.kitp.ucsb.edu/online/singular_m07/brandenberger/
>One thing he said somewhere in teh middle is that Eternal inflation
>does not obey Bianchi identities.
>This is something I am hearing for the first time. Can someone(esp.
>Steve Carlip, John Baez, Ted Bunn, or
>anyone else) confirm if this is really true ,or is it just that I was
>misinterpreting what Robert said). If so
>can someone point me to a paper(where this is discussed) or a simple
>way in which this can be seen?

I haven't listened to the talk yet, and I probably won't get around to
it right away, but this sounds very odd to me. As far as I know,
eternal inflation is built on top of standard general relativity, in
which the Bianchi identities are satisfied identically.

But I'm not an expert on inflationary models (or even really on GR,
despite having written that paper on Einstein's equation with John
Baez, and despite the fact that I'm currently teaching a course on
it). So if someone better qualified (e.g., Steve or John) comes along
and contradicts me, you should certainly believe them, not me.

-Ted

--
[E-mail me at name@domain.edu, as opposed to name@machine.domain.edu.]