What is Collapse: Definition and 468 Discussions

Collapse! is a series of tile-matching puzzle video games by GameHouse, a software company in Seattle, Washington. In 2007, Super Collapse! 3 became the first game to win the Game of the Year at the inaugural Zeebys. The series has been discontinued since 2015 due to RealNetworks shutting down its internal games studio.In 2006, a spin-off series called Super Collapse Puzzle Gallery! was developed into 5 games.

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  1. C

    Description of Wave Function Collapse

    Hello, I'm new to Physics Forums, so I apologize if this question seems somewhat uninformed, but I have recently started studying quantum mechanics, and was curious about the idea of the wave function collapse, and how, from what I can tell, it seems to be approached completely independently...
  2. C

    Why did WTC7 collapse at free fall speed despite resistance from structure?

    I am having trouble understanding a building collapse. According to NIST, on 9/11 WTC7 collapsed after fire weakened its structural steel. They have however admitted that WTC7 fell for 2.25 seconds at free fall. (http://wtc.nist.gov/NCSTAR1/PDF/NCSTAR%201A.pdf) However isn't all the...
  3. I

    Does this experiment demonstrate that conscoiusness causes collapse?

    http://www.bottomlayer.com/bottom/reality/chap2.html#difference The beginning part of this source is cursory, scroll all the way down to the bullet points labeled with numbers 1., 2., 3., 4. and read them.
  4. P

    Collapse of wavefunction - how long it takes?

    Let's consider the following desitegration \pi^0 \rightarrow e^+ + e^- . If measure the spin of electron we know the spin of positron but what if particles are far away. Is it still true. Does anyone measure the correlation of spins if the particles are really far off. Maybe we observe the...
  5. F

    Question on the Collapse of the wave function?

    Fact 1.From relativity we have come to view the universe as 4 Dimensional. That is 3 Dimensions of space and 1 of time. As such I have the following questions. Questions 1. Given the universe is 4D, does it not follow that all objects within the universe is 4D? 2. If 1 is true, does it mean...
  6. G

    Why dont air molecules cause collapse

    Hey everyone, I'm not a math or physics major. I've just read a bit about quantum physics and find it interesting. If i understand it correctly, with the two slit experiment, when you send one particle at a time through without a particle detector by the slit, it results in an interference...
  7. S

    What is the current status of Colony Collapse Disorder?

    Hi I read an article on this about a year ago or so which outlined the issues and the possible causes. Aside from cellphone radiation, it seemed like none of the other proposed causes had been conclusively ruled out. I'm just wondering if anyone could give me a bit of an update on this...
  8. B

    Wave Collapse and Degenerate States - A Quick Question

    Let's say you have some quantum particle whose eigenvalues for some observable Q are either degenerate or non-degenerate. If you measure the observable and find it to be in a non-degenerate state, then you know that the wave function has collapsed onto this state. Now if you measure the...
  9. D

    Will a Photon Inside a Perfectly Reflecting Box Eventually be Detected?

    I have a sphere or a box with ideally reflecting sufraces (inside). I open a cover, catch 1 photon, and close a cover. Photon is infinitely reflected back and forth inside. I can open a cover later and analyze it. Now say I can a 'superposition' with 50% of the chance that I have a photon and...
  10. C

    Are Black Holes Real? Investigating Gravitational Collapse

    hi, I have a question. Is it a reasonable assumption that there is no force that will prevent collapse to a singularity? Without knowledge of the physics involved, and with the impossiblity of singularities in nature (which again might be suspect reasoning), why are black holes considered...
  11. C

    Gravitational collapse of a cloud of hydrogen

    I often hear that stars form when giant clouds of hydrogen start to collapse under gravitational forces, so I started thinking about this. Gravity depends on the masses and distances of objects. So how many atoms of hydrogen would you need, and at what average distance would the atoms need to...
  12. A

    Exploring the Tacoma Narrows Bridge Collapse

    Homework Statement Hi, i want to do a science fair project on the Tacoma Narrows Bridge Collapse. I want to do a research on the Tacoma Narrows Bridge collapse and how it taught us what structures stabilize a bridge against wind forces. I also want to build something that would demonstrate the...
  13. P

    Can a Black Hole's Event Horizon Ever Collapse in on Itself?

    I saw this question posted in a Yahoo forum. I would be interested in the answers from the people here: "We can all agree that the more massive a black hole is the smaller the circumference of the black hole's event horizon will be. Therefore, can a black hole ever have enough mass to where...
  14. baywax

    Younger Dryas Caused by Ice Dam Collapse?

    This is a story that just came out today (Nov. 16, 2009): Here's the story: http://www.nationalpost.com/todays-paper/story.html?id=2228018 Here's the paper: http://cat.inist.fr/?aModele=afficheN&cpsidt=20683217 Of course, its all Canada's fault again. :tongue2:
  15. L

    Wave function collapse and the statistical nature of quantum states

    Sorry for a (maybe) dumb question, but... I understand that according to QM, the description of the situation for a particle or system is described by a linear superposition of the wave functions of all the possible states (eigenstates) of the system. When a measurement is made, the wave...
  16. S

    Why does air way collapse when pressure outside exceeds pressure inside?

    Ok this makes sense but pressure inside an airway is determined by hydrostatic pressure and when air moves fast hydrostaic pressure is decreased and converted to kinetic energy. So this collapses the airway. My question is doesn't kinetic energy of moving molecules exert a pressure on the walls...
  17. N

    Temperature during black hole collapse

    Let's say you are an observer on the surface of a massive object that is collapsing to form an eventual black hole. As the object's surface approaches its own Schwarzschild radius, light from the object is increasingly redshifted, as seen by distant observers, approaching infinite redshift as...
  18. G

    Measurement collapse as a perturbation?

    Is it possible to describe the measurement process in QM simply as a perturbation to the system (either a small one or a very large one) so that effectively the eigenstates of the Hamiltonian evolve into eigenstates of an additional measuring operator? So at t=0 the Hamiltonian H turns into...
  19. Ivan Seeking

    What caused the 2008 Global Economic Collapse?

    One year ago this week, the failure of the banking and investment systems turned the global economy upside down. Apparently we define the beginning of the collapse to be the failure of Lehman Brothers. IIRC, by this time, Fannie and Freddie had already been bailed out. Late edit: Okay...
  20. M

    Neutron star collapse can produce GBBs?

    If a neutron star accumulate materials from its companion star ,then it's mass exceeded Tolman–Oppenheimer–Volkoff limit, it will collapse into a black hole! My question is ,in this case ,it will produce "gamma-ray burst"?
  21. T

    News Is economic collapse in the United States imminent?

    http://www.nytimes.com/2009/08/26/business/economy/26deficit.html http://www.americanbankingnews.com/2009/08/25/white-house-predicts-1-6-trillion-dollar-deficit-in-2009/ If you need more stories then google it. (I posted the New York Times article because they're notorious for liberal spin and...
  22. zonde

    Wave function collapse and entanglement

    Sorry people but some quantum mysteries look quite trivial to me. Wave function collapse for photons is actually subsampling of whole sample of photons. That way wave function collapse can happen instantaneously in the whole experimental setup or even backwards in time. Photon entanglement...
  23. elfmotat

    Having trouble understanding the wave function collapse.

    What about the act of observation actually causes a particle to break the superpostion and "decide" what its state is? What property does the observer posses that changes the the way particles behaves?
  24. F

    Gravitational collapse to form a black hole

    Ok so if we have some matter(a star or whatever) and under classical laws of gravity(GR) this matter is going to form a black hole. If we're in the frame A of the collapsing matter then there will come a time(measured in that frame) that the matter crosses the event horizon after which no events...
  25. M

    Particle collisions collapse wave function?

    I am imagining the collision between two subatomic particles. For the particles to have collided, do we say that the spatial wave functions for each particle must have collapsed to the same point? Or do we say that the particles are just in a very close vicinity, and the wave functions need not...
  26. L

    Collapse of Pauli exclusion principle

    What happens when a neutron star collapses into a black hole and it's no longer obeying the Pauli exclusion principle? In terms of quantum mechanics? Say it collapses because it gets more massive. A "neutron degeneracy pressure" can be calculated, which is what keeps the neutron star from...
  27. M

    Entropy increase in gravitational collapse.

    I want to hear your opinion on this: Let's say that the universe in time zero consists just of a cloud of matter. Now as the time progresses, and the matter interacts gravitationally, it will gradually collapse into a sphere. Will the entropy of the universe really increase?
  28. jaketodd

    Momentum transferred even though no collapse?

    For example, in the double slit experiment, is momentum transferred to say, the wall in between the slits even when the particle manifests on the wall behind the slits? In other words: Is momentum transferred to places where the particle does not manifest? Thanks! Jake
  29. U

    Structure formation/Gravitational collapse

    Homework Statement Suppose that the stars in a disk galaxy have a constant orbital speed v out to the edge of its spherical dark halo, at a distance R_{halo} from the center of the galaxy. 1. What is the average density \rho for the galaxy, including its dark halo? 2. If a bound structure...
  30. C

    Antarctic ice shelf half the size of Scotland on verge of collapse

    http://www.guardian.co.uk/world/2009/apr/05/ice-shelf-wilkins-antarctic"
  31. E

    How would one collapse a molecular wavefunction?

    In NMR for molecules, one can collapse the nuclear spin wavefunction \psi_{nucspin} by applying the magnetic moment operator \mu. That is, \psi_{nucspin} becomes one of the eigenfunctions of \mu. This physically corresponds to hitting the nuclei with photons in the radiofrequency range. In...
  32. F

    Schrodinger Equation and wavefunction collapse

    If we solve the Schrodinger Equation for hydrogen atom, we get discrete energy levels that agree with experiment. But no where we need the wave function collapse. So my question is where the wave function come from and why do we need it?
  33. A

    The effect of wavefunction collapse on spacetime?

    Hi folks, I'm not sure if it's best to ask this question here, or in the Special & General Relativity section - it's probably more appropriate for this forum. I've been wondering about the following question: what effect does wavefunction collapse have on space-time? For example, if we...
  34. K

    If a wavefunction can only collapse onto a few eigenstates

    I just started learning QM. I was wondering, if a wavefunction can only collapse onto a few eigenstates, how come the probability distribution graph is a usually continuous one? :S
  35. H

    Quantum Collapse: Unravelling the Mechanics

    this is a question that has been bugging me from the beginning of my learning of quantum mechanics. why does the the wavefunction collapse when we do a measurement? since we have no concrete idea about collapse, we use probability theory to understand quantum phenomenon. but at least from...
  36. O

    Could the Universe Be Collapsing Without Our Knowledge?

    Could it be that the universe is collapsing upon us without us yet knowing since the nearest star to us is about four light years away and therefore we have no present way of knowing what has happened during the last four years beyond that nearest star?
  37. stevebd1

    Collapse to a ring singularity

    One thing I’ve always found a bit of a curiosity is how a rapidly rotating star might collapse to a ring singularity relative to the speed of light and what the final parameters of the ring singularity might be (i.e. reduced circumference considering r=0 at the ring edge). Due to the...
  38. MTd2

    Wave function collapse causes gravity? (article title)

    http://arxiv.org/abs/0902.1464 Does wave function collapse cause gravity? Authors: Lajos Diósi (Submitted on 9 Feb 2009) Abstract: We give a twist to the assumption - discussed in various earlier works - that gravity plays a role in the collapse of the wave function. This time we discuss...
  39. N

    Thermal radiation during black hole collapse

    My question is, when a compact star collapses to form a black hole, how does it manage to dispose of the heat necessary to make this transition? Naively, it would seem that the object can never cool itself fast enough due to increasing gravitational redshift of its thermal radiation. Each...
  40. thenewmans

    The collapse of one wave function is the creation of another

    Poor title. Actually I have a whole bunch of wave function questions. I don’t know the boundaries of this concept. Assuming a correct wave function, can a particle have more than one? Can 2 observers each have their own wave function? The moment a particle encounters another particle, does one...
  41. Ivan Seeking

    News The up side of economic collapse and terrorism

    http://www.ft.com/cms/s/0/7a03e5b6-c541-11dd-b516-000077b07658.html?nclick_check=1 This is something that Astro and I were talking about recently. I suspect that one ramification of the current economic crisis is that nations are being forced to work together in ways that we've never seen on...
  42. Demystifier

    Does collapse violate exchange symmetry?

    Consider a system of two bosons with spin, say photons. The wave function must be symmetric under the exchange of the two particles. For example, |psi> = |up> |down> + |down> |up> So far, so good. Now let us measure the spin of the particles, and let the outcome of the measurement be that...
  43. P

    Electron wave function collapse

    As far as I understand it, an electron exists as a probability cloud around an atom, representing all the possible places it could be. Then when we make an observation the wave function collapses to one point where we see the electron. So what happens if we keep looking at it? Does the elctron...
  44. rootX

    News Impact of economies collapse on global society

    http://news.bbc.co.uk/2/hi/business/7659086.stm I was wondering how this will affect the humans' migration and global culture (authority too) etc. It seems like China is getting ahead and migration flow will be reversed. I don't have enough data and knowledge to make any predictions but for...
  45. Q

    Collapse calculation (surce code?)

    Hello, I would like to define (calculate/plot) the radius of collapsing interstellar cloud as a function of temperature, density and presure of the star. I would like to describe the collapse calculations of an originally homogenous cloud of one solar mas, with low initial presure and...
  46. wolram

    Life without Intraweb: Super Virus Impact

    What would life be like with no intraweb, may be caused by some super virus, how would the world carry on?
  47. A

    Wave collapse vs. Friis transmission equation

    If waves collapse upon detection, how is it that the Friis transmission equation yields accurate results? Regards, Bill
  48. H

    Challenging the Collapse: Examining the Proof of State in Quantum Physics

    Proof of state "collapse? Maybe I don't even have the terminology correct for this... I'm a quantum physics noob :) My question is this: take the EPR experiment for example. What I've heard is that each electron in the pair is in an indefinite state of spin (either + or - with respect to a...
  49. L

    Density to spherical radius collapse ratio?

    So in the world of protons, neutrons and electrons, these pieces of matter combine to create what we see around us. Solids, liquids and gases. What I'm trying to figure out is the spatial area to mass ratio before this general structure of protons, neutrons, and electrons collapses into...
  50. D

    Is there a description of collapse in QFT ?

    In QM we have the postulate of measure giving rise to the notion of wave function collapse throught measurement. Is there an analog description of collapse in QFT (even an effective one) ? And what is then collapsing ? The field ? What would that mean ? I'm interested for references on the...
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