That was his inspiration, but it doesn't mean he couldn't later also
look at it as a force. Why worry about what it's called or what
Einstein thought about it. Einstein is certainly not the last word on
general relativity. He thought black holes couldn't form, much less
radiate.
Brent
On 3/16/2025 4:48 AM, Alan Grayson wrote:
On Friday, March 14, 2025 at 11:41:45 PM UTC-6 Alan Grayson wrote:
On Friday, March 14, 2025 at 11:03:37 PM UTC-6 Brent Meeker wrote:
Except he didn't show any such thing and he generally did
regard it as a force, although he saw merit in Minkowski's
geometric interpretation.
Brent
Poor choice of a word on my part; he didn't "show" gravity wasn't
a force; rather he concluded it from a thought experient of man in
free fall. You can conclude this from his direct quote, which I
recently read. AG
*Here is the quote I referred to above:*
*
*
*https://en.wikipedia.org/wiki/Equivalence_principle*
*
*
*"Soon after completing work on his theory of gravity (known asgeneral
relativity <https://en.wikipedia.org/wiki/General_relativity>)^[6]
<https://en.wikipedia.org/wiki/Equivalence_principle#cite_note-6>
^: 111 and then also in later years, Einstein recalled the importance
of the equivalence principle to his work:*
*The breakthrough came suddenly one day. I was sitting on a chair
in my patent office in Bern. Suddenly a thought struck me: If a
man falls freely, he would not feel his weight. I was taken aback.
This simple thought experiment made a deep impression on me. This
led me to the theory of gravity.*
*— **Einstein, 1922*^[7]
<https://en.wikipedia.org/wiki/Equivalence_principle#cite_note-7>*"*
*
*
*CMIIAW, but Wiki incorrectly says this is the EP. Doesn't Einstein's
statement above just show how he concluded gravity isn't a force, not
that gravity is equivalent to acceleration, and not that all bodies
fall at the same rate in gravitational fields (the WEP)? AG *
On 3/14/2025 2:59 AM, Alan Grayson wrote:
Maybe the EP just showed Einstein that graity is not a force,
so it must be modeled differently, possibly by geometry? AG
On Wednesday, March 12, 2025 at 3:37:55 PM UTC-6 Alan Grayson
wrote:
As precisely as possible, can anyone describe the
function and value of the EP in the construction of GR?
Alternatively, how are the field equations implied by the
EP? TY, AG
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