Originally Posted by

**Nic321**
Ok, but there has to be a deep reason why the constants keep their values across time and space. Understanding why these constants keep their values would tell a lot on how the universe works, how space time emerges etc...

Originally Posted by

**Nic321**
In any case, there has to be a mecanism that change those constants over time, in the very long term ( like in an inflationary universe). I have trouble buying the idea that the universe would necessarily have certain exact constants values that would suit our existence. There has to be some degree of evolution of the constants to explore all the possible values. So this means there has to be a mechanism that make these constants change

No. The fundamental constants are not the parametisation of degrees of freedom of reality. For example,

,

, and

together describe the scale of the standard units of measure relative to the fundamental scale of reality. This can be seen most clearly by combining

,

, and

to form

,

, and

, the Planck units of length, time, and mass respectively. Together, these Planck units are

*equivalent* to

,

, and

. That is, one can recover

,

, and

from the Planck units, and therefore replace

,

, and

by

,

, and

as fundamental constants.

Numerically, the Planck units are expressions of the fundamental units in terms of the corresponding standard units. But the Planck units ought to be able to stand alone as units to which all measurements are referred. In other words, the current standard units, though convenient, are redundant. In this case without other standard units, how does one specify the magnitude of the Planck units? In particular, how does one specify the magnitude of the Planck units in a way that any

*change* in the magnitude becomes meaningful? Thus, the notion that the fundamental constants can be changed is meaningless when the true nature of the fundamental constants is considered.