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From: Mikko <mikko.levanto@iki.fi>
Newsgroups: sci.physics.relativity
Subject: =?utf-8?Q?Re:_Paper_Series:_Shift-symmetry_in_Einstein=E2=80=99s_Universe?=
Date: Fri, 12 Jul 2024 12:29:34 +0300
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On 2024-07-11 13:33:32 +0000, gharnagel said:

> On Thu, 11 Jul 2024 7:53:05 +0000, Mikko wrote:
>> 
>> Perfect conservation of energy is not essential to relativity. However,
>> relativity requires that if energy or momentum is conserved then both
>> are.
> 
> Our universe seems quite rigid about conservation of both.

So it seems.

>> The time direction symmetry is not an essential part of relativity.
> 
> Our universe seems quite rigid about that, too.

Not to the same extent. In particular, the second law of thermodynamics
is asymmetric.

-- 
Mikko