lightcone output with a flat backward surface

From: Yucheng Zhang <>
Date: Fri, 15 Apr 2022 00:46:07 -0400

Dear Volker and Gadget users,

I have been wondering if it's possible to generate lightcone output with a
flat backward surface (i.e. assuming that light travels in parallel to a
certain direction instead of a point observer)?
In the documentation, the type=3 (disk) seems to be a similar option but
I'm a bit confused about what's the relation between (a_start, a_end) and
the additional thickness parameter.

The reason this might be useful is that we can then run the simulation in a
long box assuming that the lightcone backward surface is moving from one
end to the other.
Then the output lightcone is simply the same box including all the
particles with the long side being the redshift.
Compared to pencil beams, in some discussions where geometry is not very
important, this simplification could be more efficient.

Thanks in advance for any help or suggestions!

Best regards,

Yucheng Zhang
Ph.D. Candidate | CCPP | Physics | NYU
Received on 2022-04-15 06:46:38

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