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Quantum Gravity: Difference between revisions
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{{ | |image=Eric profile picture.jpg | ||
{{ | |nameurl=https://x.com/EricRWeinstein/status/1762181012732441040 | ||
|name=Eric Weinstein | |||
|usernameurl=https://x.com/EricRWeinstein | |||
|username=EricRWeinstein | |||
|content=āString theory approaches experimental verification.ā | |||
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āNew Breakthrough in [[Quantum Gravity]] upends everything.ā | |||
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āBlack holes discovered for the first time inside quantum computer.ā | |||
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āAI to deliver theory of everything within 18 months say experts.ā | |||
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āHuman Teleportation inches closer.ā | |||
|quote= | |||
{{Tweet | |||
|image=Debriefmedia-profile-GpTlhl96.png | |||
|nameurl=https://x.com/Debriefmedia/status/1762097142309474395 | |||
|name=The Debrief | |||
|usernameurl=https://x.com/Debriefmedia | |||
|username=Debriefmedia | |||
|content=Quantum gravity breakthrough: Physicists report they are now one step closer to the measurement of gravity at the quantum level. https://thedebrief.org/breakthrough-in-quantum-measurement-of-gravity-achieved-using-levitating-magnets/#sq_hn75ogbo69 | |||
|timestamp=12:47 PM Ā· Feb 26, 2024 | |||
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|timestamp=6:21 PM Ā· Feb 26, 2024 | |||
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{{Tweet | |||
|image=Eric profile picture.jpg | |||
|nameurl=https://x.com/EricRWeinstein/status/1769147019254481113 | |||
|name=Eric Weinstein | |||
|usernameurl=https://x.com/EricRWeinstein | |||
|username=EricRWeinstein | |||
|content=[Nerd Alert. You may want to skip this tweet.] | |||
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There is a very subtle problem here for [[Quantum Gravity|āQuantum Gravityā]] that worries me that doesnāt seem to worry physicists. | |||
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If gravity becomes uncertain, the force particle medium continues to exist. | |||
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Bosonic Waves: UNCERTAIN </br> | |||
Bosonic Medium: CERTAIN</br> | |||
Bosonic Norm: UNCERTAIN</br> | |||
Bosonic Derivative: EXISTS | |||
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So the photon medium exists. And there is still a derivative called the exterior derivative. | |||
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This is not true for matter waves. Unless there is a metric 2-tensor g_ij (i.e. the rulers and protractors I always mention) then the matter medium is not defined. | |||
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Fermionic Waves: UNCERTAIN </br> | |||
Fermionic Medium: UNCERTAIN</br> | |||
Fermionic Norm: NONE</br> | |||
Fermionic Derivative: NONE | |||
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That to me is a major difference between GL(4,R) double cover and SL(2,C). And there is no Dirac operator either. There is no DeRahm type theory for Spinors. Only a Hodge like Dirac theory. | |||
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I am always assured that this is no problem at all. Mumble mumble tetradsā¦.Vierbien thisā¦moving framesā¦Ashtekar Variablesā¦something somethingā¦not a problem. | |||
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I donāt believe it. I think itās a problem. I could be wrong. But I am not yet convinced. Maybe Iām just not getting it. But Iām really really not getting it. I think itās wrong that there is no big deal here. | |||
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Iām not going to get into a major back and forth on X. But if you know what I am talking about, respond and perhaps we can maybe hash it out in a better forum if it makes sense. | |||
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Thx. | |||
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|image=Kaju_Nut-profile-z4klG7sx.jpg | |||
|nameurl=https://x.com/Kaju_Nut/status/1769065754769473859 | |||
|name=Nirmalya Kajuri | |||
|usernameurl=https://x.com/Kaju_Nut | |||
|username=Kaju_Nut | |||
|content=Question for physicists: If superposition of macroscopic objects is achieved, their gravitational potentials could be in a state of superposition. | |||
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Is there a sense in which such experiments probe quantum gravity? | |||
|timestamp=6:18 PM Ā· Mar 16, 2024 | |||
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|timestamp=11:41 PM Ā· Mar 16, 2024 | |||
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{{Tweet | |||
|image=Eric profile picture.jpg | |||
|nameurl=https://x.com/EricRWeinstein/status/1769157667166310487 | |||
|name=Eric Weinstein | |||
|usernameurl=https://x.com/EricRWeinstein | |||
|username=EricRWeinstein | |||
|content=That I can explain. I am convinced that there are clear reasons that gravity/metrics are different than all other fields that indicate that the entire 70 year [[Quantum Gravity|quantum gravity]] program hasnāt been thought through at a basic level. This says āMaking Gravity quantum destroys all matter.ā Thatās sorta sloppy. But you canāt DEFINE matter (spinors) without gravity (a metric). So you CANāT casually quantize gravity. It seems kinda basic. | |||
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Maybe Iām just not getting it. Donāt want to confuse others if Iām wrong. But I donāt get any of the explanations that come back. And that usually means the [[Quantum Gravity|quantum gravity]] community is not on top of their game historically. | |||
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|image=_Jake_Rogers_-profile-Tv9iGDRV.jpg | |||
|nameurl=https://x.com/_Jake_Rogers_/status/1769153956872348125 | |||
|name=Jake Rogers | |||
|usernameurl=https://x.com/_Jake_Rogers_ | |||
|username=_Jake_Rogers_ | |||
|content=I ask because I'd love to see WHY you care so much about all this. I get hints from your videos speaking on gauge. But your commentary here is not super approachable and maybe that's fine. | |||
|timestamp=12:09 AM Ā· Mar 17, 2024 | |||
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|timestamp=12:23 AM Ā· Mar 17, 2024 | |||
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