Recent content by renormalize

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    Graduate Some derivation in QFT in Curved SpaceTime by Birrell and Davies

    No, because your last equation for ##\Delta\tau## is wrong since it contradicts B&D's eq. (3.57). Remember that ##t## is coordinate time and ##\tau## is proper time. For an inertial trajectory they differ by a factor of ##\left(1-v^2\right)^{1/2}##.
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    Can a flow created by a fan show an Edge effect when hitting a wall?

    It's not difficult to find technical papers online that analyze 2D laminar flow around a rectangular cylinder. Here's one example picked more or less at random: Effect of Corner Curvature of Square Cylinder on Flow Transition and Heat Transfer This paper computes and compares the flow patterns...
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    Undergrad Does the scale factor need to be normalized?

    I'm just curious: is it somehow significant that you write ##1100+1## instead of ##1101\,##?
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    Undergrad Why is water pressure increased in a plastic bag in a bucket?

    I have no trouble going back to the first thread page, where post #1 does indeed show various situations for soaking clay. As far as I can see, no other posts in the entire thread have similar pictures. What is the lowest post number that you can view?
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    Graduate Consistency of Relativistic QM

    Here's a recent thread on that topic: https://www.physicsforums.com/threads/how-to-fix-relativistic-qm-so-its-consistent.1082760
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    Analysis Need Self study book for Fourier Series and Generalized Functions

    Just $1.75 IN THE U.S.A. or 65p (13s) NET IN U.K. says the cover of the 1970 reprint that I bought in the late 1970s.
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    What is the fourth dimensional equivalent of volume?

    Hypervolume, which is bounded by 3D hypersurfaces.
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    Machining Aerogel

    Sorry, I only know of Aerogel Technologies contact page at https://www.aerogeltechnologies.com/contact/, which lists their phone numbers as: US Toll-Free (844) AEROGEL (844) 237-6435 International and Boston Local +1 (617) 800-0414 and their snail-mail address as: Aerogel Technologies, LLC 106B...
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    Undergrad Rotation curve in spiral galaxy velocity and uniform velocity dispersion

    Is this deviation also expected for gravitation on the scale of the solar system? Can you cite a technical reference that derives this effect? Thanks.
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    High School Can gravitons be detected?

    Any gravitational wave detectable on Earth with current technology would consist of an immense number of gravitons: (https://physics.stackexchange.com/questions/438306/can-ligo-be-explained-in-terms-of-gravitons) Thus, the effect on the overall wave of "blocking" (absorbing) a single graviton...
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    High School Fan is pushing in the front and sucking from the back

    @Herman Trivilino, do you disagree with the illustration? It clearly depicts the fluid to be flowing through the ear tube in order to reach the ear canal.
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    Polar integral

    Just want to point out that the full version of Mathematica can evaluate the triple integral symbolically for arbitrary positive ##a\,##:
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    Graduate Wavefunction in the context of quantum physics

    https://en.wikipedia.org/wiki/Rigged_Hilbert_space
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    Undergrad Colors in a plasma globe

    Here's the link to a free PDF of that paper hosted by the US Department of Energy: https://www.osti.gov/servlets/purl/973080.
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    Undergrad Colors in a plasma globe

    How much research did you attempt before posting your question? I ask because at or near the top of a simple google search for "plasma globe colors" is the Wikipedia link https://en.wikipedia.org/wiki/Plasma_globe which states: "Plasma balls are driven by high-frequency (approximately 35 kHz)...