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From: Evgeny Kurbatov <kurbatov_at_inasan.ru>

Date: Fri, 12 May 2006 13:29:44 +0400

Hi!

Please help me to shed light on four questions:

1. The drift factor looks as if the internal velocity variables would be

a^2 \dot{x} ,

where `x' is the comoving coordinates and `a' is the scale factor. But

procedures `init' and `fill_write_buffer' tell us that internal velocity is

a^{3/2} \dot{x}

(I mean that the `\dot{x}' stores in a snapshots).

2. Why the gravkick factor is

\int da / (a^2 H) ?

3. Why the hydrokick factor differs from the gravkick factor?

4. How in the GADGET-2 the cooling due to cosmological expansion

realizes? Looking into the code I didn't find corresponding term in the

DtEntropy calculation.

Thanks!

Received on 2006-05-12 12:30:27

Date: Fri, 12 May 2006 13:29:44 +0400

Hi!

Please help me to shed light on four questions:

1. The drift factor looks as if the internal velocity variables would be

a^2 \dot{x} ,

where `x' is the comoving coordinates and `a' is the scale factor. But

procedures `init' and `fill_write_buffer' tell us that internal velocity is

a^{3/2} \dot{x}

(I mean that the `\dot{x}' stores in a snapshots).

2. Why the gravkick factor is

\int da / (a^2 H) ?

3. Why the hydrokick factor differs from the gravkick factor?

4. How in the GADGET-2 the cooling due to cosmological expansion

realizes? Looking into the code I didn't find corresponding term in the

DtEntropy calculation.

Thanks!

Received on 2006-05-12 12:30:27

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