l**n
发帖数: 67 | 1 We'd better keep a clear mind even we are facing numerous jargons
in physics and maths. A few comment on what we are talking
about in comso.8 could help.
Geometry analogy
Let's look at a point P on the flat plane in the 3-D Euclidean
space. And we just consider the local property of the P.
First we notice the distance relation is given by the familiar
law of Pythagoras,
ds^2 = dx^2 + dy^2 (1)
where x, y are our local Cartesian coordinates. Then we find we
can map the plane | f*******d
发帖数: 339 | 2
My feeling is that you spend more time on trying to understand
relativity theory than cosmology.
【在 l**n 的大作中提到】
: We'd better keep a clear mind even we are facing numerous jargons
: in physics and maths. A few comment on what we are talking
: about in comso.8 could help.
: Geometry analogy
: Let's look at a point P on the flat plane in the 3-D Euclidean
: space. And we just consider the local property of the P.
: First we notice the distance relation is given by the familiar
: law of Pythagoras,
: ds^2 = dx^2 + dy^2 (1)
: where x, y are our local Cartesian coordinates. Then we find we
| l**n
发帖数: 67 | 3
They are highly related, aren't they? I don't want to just
wave my hand to other people. It's totally impossible to understand
more about black hole without knowing basic knowledge in GR and
differential geometry. And it also impossible to know more about
inflation without basic knowledge on QFT. And theories like GR, quantum
gravity, quantum topology are
interesting too. I always believe science is not only the story of a
group of people called scientists. I only think i understand it if
i ca
【在 f*******d 的大作中提到】
:
: My feeling is that you spend more time on trying to understand
: relativity theory than cosmology.
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