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billtodd's latest activity
billtodd
replied to the thread
I
Questions about paper "How closed is cosmology"
.
:oldbiggrin: one should be really careful with words and their context. As I am quite acquainted with both maths and physics. :cool:
Tuesday, 12:54 PM
billtodd
reacted to
Bandersnatch's post
in the thread
I
Questions about paper "How closed is cosmology"
with
Like
.
Finite but >without a boundary<. The term 'bounded' when referring to metric spaces is tantamount to finite. A 3-sphere is boundaryless...
Tuesday, 12:51 PM
billtodd
replied to the thread
I
Questions about paper "How closed is cosmology"
.
Well the sphere is bounded by the fact that it's the boundary between the interior of a 4-d ball and the outside of the ball. But the...
Tuesday, 12:48 PM
billtodd
replied to the thread
I
Questions about paper "How closed is cosmology"
.
I don't understand this claim. if it's spatially finite then it should be bounded, if it's unbounded then it cannot be spatially finite...
Tuesday, 10:41 AM
billtodd
replied to the thread
Transformations with the Mukhanov variable (Cosmology)
.
What is ##\partial_i R##? Derivative w.r.t what?
May 9, 2024
billtodd
replied to the thread
Transformations with the Mukhanov variable (Cosmology)
.
Is it taken from some book or paper this question of yours?
May 9, 2024
billtodd
replied to the thread
High Energy
Possible typo in Peskin & Schroeder's QFT Textbook (p. 666)?
.
First thing first. They write before deriving eq (19.74) that: "...according to eq (16.107), in our present conventions, this equation...
May 4, 2024
billtodd
reacted to
arivero's post
in the thread
A
"The 7 Strangest Coincidences in the Laws of Nature" (S. Hossenfelder)
with
Haha
.
I like to call it the Motl-Lenz formula, because Lubos claimed it in his blog as an independent discovery when he was playing with a...
May 3, 2024
billtodd
replied to the thread
A
"The 7 Strangest Coincidences in the Laws of Nature" (S. Hossenfelder)
.
'is' is just is, isn't it? :oldbiggrin: or should I have said ain't it?
May 3, 2024
billtodd
replied to the thread
A
"The 7 Strangest Coincidences in the Laws of Nature" (S. Hossenfelder)
.
the symbol '=' means different thing for different people. :cool:
May 3, 2024
billtodd
replied to the thread
A
"The 7 Strangest Coincidences in the Laws of Nature" (S. Hossenfelder)
.
Regarding the fine-tuning issue. I remember reading the Hebrew translation of "The whole She Bang", where he wrote that the universe...
May 1, 2024
billtodd
reacted to
anuttarasammyak's post
in the thread
Engineering
How to find the impulse function?
with
Like
.
Transform 1 and -e^2i##\omega## each and sum them up. It does not work?
Apr 27, 2024
billtodd
replied to the thread
Engineering
How to find the impulse function?
.
It's ok, thanks!
Apr 27, 2024
billtodd
posted the thread
Engineering
How to find the impulse function?
in
Engineering and Comp Sci Homework Help
.
So I have: ##H(\omega)=(\exp(-i\omega)-\exp(i\omega))\exp(i\omega)##, I denote by ##Z(\omega)=\exp(i\omega)##, to get...
Apr 25, 2024
billtodd
replied to the thread
A
Quantum Groups as a Generalization of String Theory
.
Let's say it's April's Fool. :oldbiggrin: Did your read the paper it's only 5-6 pages, but I guess you like me don't know a lot about...
Apr 24, 2024
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