Wikipedia explains that String Field Theory is a part a of Quantum Field Theory while regular String Theory is not. What exactly is the difference between String Field Theory and String Theory?

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• Wikipedia explains that String Field Theory is a part a of Quantum Field Theory while regular String Theory is not. What exactly is the difference between String Field Theory and String Theory?
• What is happening at cellular and tissue levels in “muscle knots”?
• Prior to the moment of aggressive inflation of the Universe, all matter was compressed into a space smaller than a proton. I understand the hypotheses leading to an expanding Universe, but why didn't all matter in such a tiny space simply result in a Universe-massed black hole?
• How does the hardware/software stack in cell towers manage 1000s of users simultaneously?
• Why is spin imortant when talking about it in relation to particles and what is meant by spin determining how the particle looks from different directions?
• How do we know that quarks exist?
• How do we know a black holes rotate? And why would it make any difference if it rotates or not?
• What is happening on a circuitry level when I turn the brightness up or down on my phone?
• What actually kills a person when their body temperature is too low?
• Are there any diseases that affect both plants and animals?
• In a=v²/r acceleration decreases with a larger circle. In a=ω²r, acceleration increases with a larger circle. Why is this?
• I'm reading a book that mentions Nazis were able to determine the weather in London from the hourly broadcast of Big Ben's Chime on BBC. How would a physicist in 1940s find that out?
• How do lattice vibrations in conductors affect resistance?
• What is meant by the “active expulsion of the magnetic field” in the Meissner effect?
• Why does a magnet levitate above a superconductor?
• This morning I got a cardiac stress test with technetium-99. How is it made?
• How does an object cool in space if it's a vacuum with no adjacent atoms influencing it?
• Why is symmetry so important?
• There's no such thing as a perfect vacuum. But what's the closest to a perfect vacuum in nature? In the least dense part of space, how far apart are two atoms?
• Why do we sneeze, and what is happening during a sneeze?
• What determines the phasing of emitted photons?
• Why is the maximum density of water achieved at 4°C, then becomes less dense until the freezing point?

Wikipedia explains that String Field Theory is a part a of Quantum Field Theory while regular String Theory is not. What exactly is the difference between String Field Theory and String Theory? Posted: 15 Jan 2018 04:10 PM PST submitted by /u/_horus2 [link] [comments]

What is happening at cellular and tissue levels in “muscle knots”? Posted: 15 Jan 2018 06:29 PM PST submitted by /u/Wdenners [link] [comments]

Prior to the moment of aggressive inflation of the Universe, all matter was compressed into a space smaller than a proton. I understand the hypotheses leading to an expanding Universe, but why didn't all matter in such a tiny space simply result in a Universe-massed black hole? Posted: 16 Jan 2018 02:15 AM PST submitted by /u/Kruciff [link] [comments]

How does the hardware/software stack in cell towers manage 1000s of users simultaneously? Posted: 16 Jan 2018 07:29 AM PST Lots of questions here: What kind of stack does a cell tower run for management? Embedded or full-fledged OS? What kind of databases (if any)? Is the hardware industrial like data-center level stuff or can it be run on consumer-grade equipment? On an individual tower how are requests prioritized? Queues in FIFO order or something more complex? Do they use full-blown databases for state management or in-memory data structures? On an individual tower when receiving/sending packets is the "unique identifying" part of a signal solely data-based (like an IMEI encoded into each packet) or is there a hardware component as well IE signal is modulated uniquely based on device? How autonomous are individual towers? If my device is within range of 3 towers how do they decide which one will manage my device? Are there "supervisor" nodes managing multiple towers to make those kind of decisions? If so what kind of hardware does that have to run and how many towers can be managed at once? Following #4, does tower management ever have manual input from the carriers like during high-population events IE sports games, concerts, etc. where usage is out of the norm? Mainly I just want greater insight into how so many users are handled simultaneously with such little latency. More karma if I can get a developer/ops perspective on this topic! submitted by /u/FoxxMD [link] [comments]

Why is spin imortant when talking about it in relation to particles and what is meant by spin determining how the particle looks from different directions? Posted: 16 Jan 2018 06:27 AM PST submitted by /u/Xtratimesoccer [link] [comments]

How do we know that quarks exist? Posted: 16 Jan 2018 04:33 AM PST submitted by /u/lemonade_lmao [link] [comments]

How do we know a black holes rotate? And why would it make any difference if it rotates or not? Posted: 16 Jan 2018 04:17 AM PST Saw this post in r/space about a black hole spewing out matter because it rotates very fast, but it still remains its gravity right? submitted by /u/kannienchenman [link] [comments]

What is happening on a circuitry level when I turn the brightness up or down on my phone? Posted: 16 Jan 2018 07:08 AM PST submitted by /u/Yung2Neyes [link] [comments]

What actually kills a person when their body temperature is too low? Posted: 15 Jan 2018 04:59 PM PST What is the first fatal effect of lowering a person's body temperature? I bet a lot of bodily functions cease to function at too low temperature on different scales. Is there a big one? Maybe one that occurs way before the rest. Thanks. submitted by /u/minminminmin [link] [comments]

Are there any diseases that affect both plants and animals? Posted: 15 Jan 2018 04:57 PM PST If not are there any diseases that would be especially scary if animals could contract them? submitted by /u/Neato_Orpheus [link] [comments]

In a=v²/r acceleration decreases with a larger circle. In a=ω²r, acceleration increases with a larger circle. Why is this? Posted: 16 Jan 2018 04:47 AM PST To me this does not make sense because in both cases the object must be changing direction more slowly with a larger circle, yet the acceleration increases. Is there some intuitive way to understand this? submitted by /u/ten_mile_river [link] [comments]

I'm reading a book that mentions Nazis were able to determine the weather in London from the hourly broadcast of Big Ben's Chime on BBC. How would a physicist in 1940s find that out? Posted: 15 Jan 2018 08:16 AM PST In Sapiens, Yuval Noah Harari mentions During World War Two, BBC News was broadcast to Nazi occupied Europe. Each news programme opened with a live broadcast of Big Ben tolling the hour - the magical sound of freedom. Ingenious German physicists found a way to determine the weather conditions in London based on the tiny differences in the tone of the broadcast ding-dongs. This information offered invaluable help to the Luftwaffe. When the British Secret Service discovered this, they replaced the live broadcast with a set of recordings of the famous clock. I couldn't find a source for this information except a WW2 Forum that is discussing the same book and a reddit thread that links to a podcast. Therefore, I wonder if this is true at all. If it is, how would a physicist go about finding weather of a place from a live television broadcast? Will the tiny differences in pitch not fade out in the broadcast? submitted by /u/Volis [link] [comments]

How do lattice vibrations in conductors affect resistance? Posted: 16 Jan 2018 06:54 AM PST submitted by /u/nomitycs [link] [comments]

What is meant by the “active expulsion of the magnetic field” in the Meissner effect? Posted: 16 Jan 2018 06:31 AM PST submitted by /u/nomitycs [link] [comments]

Why does a magnet levitate above a superconductor? Posted: 16 Jan 2018 06:06 AM PST Simple as possible please :) submitted by /u/nomitycs [link] [comments]

This morning I got a cardiac stress test with technetium-99. How is it made? Posted: 15 Jan 2018 03:08 PM PST What form is it in as an injectable drug? What kind of radiation does it emit? How long will I be radioactive? :) submitted by /u/joegee66 [link] [comments]

How does an object cool in space if it's a vacuum with no adjacent atoms influencing it? Posted: 15 Jan 2018 06:35 PM PST Without any adjacent atoms vibrating slower to cool an object, how does it cool down in space? Why doesn't it just stay at the same temperature? If it loses energy, what causes it to lose energy and cool vs. just keep the same temperature without any external influence? submitted by /u/dr1zzzt [link] [comments]

Why is symmetry so important? Posted: 15 Jan 2018 08:44 PM PST submitted by /u/skxllbo [link] [comments]

There's no such thing as a perfect vacuum. But what's the closest to a perfect vacuum in nature? In the least dense part of space, how far apart are two atoms? Posted: 15 Jan 2018 10:05 AM PST And could the area in between them be considered a "vacuum"? How large of an area do you have to have for a void of any matter to be considered a "vacuum"? submitted by /u/anonymous123421 [link] [comments]

Why do we sneeze, and what is happening during a sneeze? Posted: 15 Jan 2018 05:30 PM PST I'm couious about sneezing, why we sneeze, and how it works. submitted by /u/Stormtrooper-85 [link] [comments]

What determines the phasing of emitted photons? Posted: 15 Jan 2018 06:14 PM PST When EM radiation is emitted by a particle (as a result of electron energy transitions, ro-vibrational transitions, etc.), what determines the phasing of those emitted photons? I know that in the case of stimulated radiation the phasing of the new photon is the same as the incident photon, but what about spontaneous emissions? Background: Was reading about free electron lasers on Wikipedia and was confused by the following portion: This energy modulation evolves into electron density (current) modulations with a period of one optical wavelength. The electrons are thus longitudinally clumped into microbunches, separated by one optical wavelength along the axis. Whereas an undulator alone would cause the electrons to radiate independently (incoherently), the radiation emitted by the bunched electrons is in phase, and the fields add together coherently. I don't understand how having the electrons bunched up together in real space causes their emissions to all be in phase. submitted by /u/fleshwad [link] [comments]

Why is the maximum density of water achieved at 4°C, then becomes less dense until the freezing point? Posted: 15 Jan 2018 01:23 PM PST Someone explained this to me as to why lakes cycle and form ice on the top rather than the bottom of the lakes. It just doesn't make sense to me that liquid water can continue to get colder but will become less dense after crossing 4°C. submitted by /u/genghis_haun [link] [comments]

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