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PeroK's latest activity
PeroK
reacted to
Tomas Vencl's post
in the thread
B
Falling into a black hole
with
Skeptical
.
Sure, but you are not sure (since we do not have exact metric) that your assumptions (event horizon + evaporation) are even together...
Today, 3:29 PM
PeroK
reacted to
ShadowKraz's post
in the thread
I
Questions about Black Holes, Hawking Radiation, and Dark Matter
with
Skeptical
.
It's all relative... lol. From our perspective, a black hole is spinning, but... well, maybe it isn't. hmmm... ok, I think it may be...
Today, 12:46 PM
PeroK
reacted to
Nugatory's post
in the thread
B
Falling into a black hole
with
Like
.
I expect that it is largely historical. When we're solving the EFE for a spherically symmetrical spacetime, it's just another...
Today, 9:55 AM
PeroK
reacted to
Tomas Vencl's post
in the thread
B
Falling into a black hole
with
Skeptical
.
May be, but fact is that exact metric for evaporating “black hole” is unknown, so claiming that “in an evaporating spacetime it does not...
Today, 9:27 AM
PeroK
replied to the thread
Continuous functions on metric spaces part 2
.
I'll make this general comment for the last time. You are not thinking through these problems in terms of what you are trying to prove...
Today, 6:48 AM
PeroK
reacted to
pasmith's post
in the thread
Continuous functions on metric spaces part 2
with
Like
.
We are not even given that X is a vector space, so we don't have a concept of linearity. @Lambda96: All you have available to you are...
Today, 6:39 AM
PeroK
replied to the thread
I
How to manipulate functions that are not explicitly given?
.
It's probably a good time to move on. That's the imprecise "physicists" way of doing calculus. There are so many books that do it that...
Today, 4:19 AM
PeroK
reacted to
Rick16's post
in the thread
I
How to manipulate functions that are not explicitly given?
with
Like
.
I understand what you mean, and yet I wanted to check the validity of Taylor's result using the formal differentiation process with the...
Today, 4:14 AM
PeroK
reacted to
Dale's post
in the thread
B
Falling into a black hole
with
Love
.
This is wrong on a couple of levels. First, it is wrong because in a basic sense there are no physical coordinate systems. Coordinate...
Today, 4:11 AM
PeroK
reacted to
Tomas Vencl's post
in the thread
B
Falling into a black hole
with
Skeptical
.
Many Many of you responsed in sense that this is not true, but…. Although I know and do not dispute the possibility of using comoving...
Today, 4:10 AM
PeroK
reacted to
PeterDonis's post
in the thread
B
Falling into a black hole
with
Like
.
YouTube videos are not good ways to learn actual science. Yes, you should expect to be "lied to" if you watch them expecting to learn...
Today, 4:10 AM
PeroK
replied to the thread
I
How to manipulate functions that are not explicitly given?
.
Although the conclusion is somewhat correct, you are falling into the trap of taking the dummy variable ##x## as inherently part of the...
Today, 2:15 AM
PeroK
replied to the thread
I
How to manipulate functions that are not explicitly given?
.
For a multi-variable function, you of course have to distinguish between the first and second arguments. Is ##\frac{\partial f}{\partial...
Yesterday, 1:20 PM
PeroK
replied to the thread
I
Only one type of elementary electric charge?
.
In the quark model, electric charge is not the only elementary one. There is also color charge, which is a property of quarks, as well...
Yesterday, 12:16 PM
PeroK
replied to the thread
I
How to manipulate functions that are not explicitly given?
.
It is an inherent notational problem. When you define a function ##f##, the definition is independent of the dummy variable you choose...
Yesterday, 11:29 AM
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