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InertialObservr's profile
〈 Berger | Dillon 〉
〈 Berger | Dillon 〉
〈 Berger | Dillon 〉
@InertialObservr

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〈 Berger | Dillon 〉

@InertialObservr

PhD student of Theoretical Particle Physics @UCIrvine l @NSF Fellow l Physics & Math Animations l Patreon: https://www.patreon.com/inertialobserver …

DC → CA
youtube.com/c/InertialObse…
Joined August 2015

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    1. Tom Ruen‏ @Tom_Ruen 2 Mar 2019
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      Tom Ruen Retweeted Ethan Siegel

      "Even though the energy falls off as 1/r^2, the amplitude only falls off as 1/r. That's why gravitational waves fall off according to a different law than electromagnetic waves."https://twitter.com/StartsWithABang/status/1101754561260249088 …

      Tom Ruen added,

      Ethan Siegel @StartsWithABang
      Ask Ethan: Why Don't Gravitational Waves Get Weaker Like The Gravitational Force Does? https://www.forbes.com/sites/startswithabang/2019/03/02/ask-ethan-why-dont-gravitational-waves-get-weaker-like-the-gravitational-force-does/ … The gravitational force gets weaker like 1/r^2, but gravitational waves scale as just 1/r. Why? Here's the explainer you've never seen before.
      2 replies 5 retweets 13 likes
    2. John Carlos Baez‏ @johncarlosbaez 2 Mar 2019
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      Replying to @Tom_Ruen

      Huh??? Electromagnetic waves also fall off in amplitude as 1/r. Is Ethan forgetting his physics or am I misunderstanding this quote? https://en.wikipedia.org/wiki/Dipole_antenna … For both gravitational and electromagnetic waves, energy density goes as amplitude squared, which goes like 1/r.

      2 replies 0 retweets 14 likes
    3. John Carlos Baez‏ @johncarlosbaez 2 Mar 2019
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      Replying to @johncarlosbaez @Tom_Ruen

      Actually Ethan's blog says "The gravitational force gets weaker like 1/r^2, but gravitational waves scale as just 1/r". That's right - and again it's the same for gravitational and electric.

      1 reply 0 retweets 10 likes
    4. Ethan Siegel‏ @StartsWithABang 2 Mar 2019
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      Replying to @johncarlosbaez @Tom_Ruen

      The difference is what shows up in your detector. For light, it's intensity or energy. For GWs, it's the amplitude of the wave that stretches or compresses space. That's why GWs scale as 1/r, and why brightness scales as 1/r^2.

      3 replies 1 retweet 12 likes
    5. Mustafa Gündoğan‏ @mustgundogan 2 Mar 2019
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      Replying to @StartsWithABang @johncarlosbaez @Tom_Ruen

      The reason is technical. There is no light detector that is fast enough to see the oscillations of an EM field in the visible (~400 THz). So the detector sees the average intensity:https://www.researchgate.net/post/Is_output_current_of_photodiode_a_DC_or_an_AC_signal …

      1 reply 0 retweets 5 likes
    6. John Carlos Baez‏ @johncarlosbaez 2 Mar 2019
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      Replying to @mustgundogan @StartsWithABang @Tom_Ruen

      Nice. At about what frequency of light can we build a detector that sees the amplitude?

      1 reply 0 retweets 0 likes
    7. Alex Knochel‏ @Quantensalat 2 Mar 2019
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      Replying to @johncarlosbaez @mustgundogan and

      I guess you can still comfortably measure the voltage at a radio antenna, so it has got to be somewhere between 10^9 and 10^14 Hz...😀

      1 reply 0 retweets 0 likes
    8. Alex Knochel‏ @Quantensalat 2 Mar 2019
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      Replying to @Quantensalat @johncarlosbaez and

      But am I correct to suspect that measuring the amplitude requires a sufficient # of photons in the radiation field?

      1 reply 0 retweets 1 like
      〈 Berger | Dillon 〉‏ @InertialObservr 2 Mar 2019
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      Replying to @Quantensalat @johncarlosbaez and

      I can tell you this.. you will at least need one photon

      4:41 PM - 2 Mar 2019
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      • Alex Knochel
      0 replies 0 retweets 1 like

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