Dale's latest activity
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Dale replied to the thread High School Is there anything in the Universe that is not fundamentally made up of matter?.What do you define as matter? -
Dale reacted to robphy's post in the thread High School Is there anything in the Universe that is not fundamentally made up of matter? with
Like.
Clearly, we are not all using the same definitions. So there is some ambiguity. And words are imperfect. So, it seems the question is... -
Dale reacted to Ibix's post in the thread High School Is there anything in the Universe that is not fundamentally made up of matter? with Like.
So, we're concluding that the answer is either yes or no, depending on what you include in the definition of the word "matter".
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Dale replied to the thread Graduate Regarding Relativity of Simultaneity, is non-local "now" impossible?.Who specifically claims that, and where did they claim it? Usually if you look in context then you can see why someone said something.
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Dale reacted to renormalize's post in the thread Graduate Can a causal or time-like structure emerge without assuming a metric? with Like.
@OmniThoughts, by joining this forum you agreed to abide by all the rules stated here...
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Dale reacted to robphy's post in the thread Graduate Can a causal or time-like structure emerge without assuming a metric? with Like.
I would prefer your thoughts.
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Dale replied to the thread Graduate Can a causal or time-like structure emerge without assuming a metric?.100%. Without any doubt or hesitation.
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Dale replied to the thread Graduate Can a causal or time-like structure emerge without assuming a metric?.@OmniThoughts Please don't post chatbot output here. If any of us wanted to have a conversation with a chatbot then we would just ask...
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Dale replied to the thread Undergrad Electric Field of Uniformly Charged Infinite Plane.By “usual” I meant “usual for the infinite plane”. Most people, when solving the infinite plane problem, implicitly choose a boundary...
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Dale replied to the thread Undergrad How many sorts of time are there in physics?.This is also what I would say is the key difference. They have different domains. It can be that on the worldline of a given clock they...
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Dale reacted to Ibix's post in the thread Undergrad How many sorts of time are there in physics? with Like.
I'd say that the proper time of a clock is only defined along its wordline, whereas coordinate and cosmological times are defined over a...
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Dale replied to the thread Undergrad How many sorts of time are there in physics?.No. Proper time does not have a notion of simultaneity like coordinate time does.
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Dale reacted to PeroK's post in the thread Undergrad Electric Field of Uniformly Charged Infinite Plane with Like.
Here is a valid derivation of the electric field for an infinite plane, based on the result for an infinite wire of uniform linear...
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Dale replied to the thread Undergrad Electric Field of Uniformly Charged Infinite Plane.I don’t think they did go awry. It is a valid solution to Maxwell’s equations. It is just a different boundary condition than usual.
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Dale replied to the thread Graduate Infinite scaling limit of an elliptic charged surface.It is a boundary condition. It isn’t about introducing an E field, it is about choosing the boundary condition that best matches the...