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quantum physics

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  1. Jedothek
    Thread

    I Causality and quantum physics

    Let me present what I think is the understanding of a particular situation in quantum mechanics, and ask people to tell me whether I am right or...
    Thread by: Jedothek, Oct 12, 2018, 3 replies, in forum: Quantum Physics
  2. Warda Anis
    Thread

    Expectation value <p> of the ground state of hydrogen

    1. The problem statement, all variables and given/known data How should I calculate the expectation value of momentum of an electron in the ground...
    Thread by: Warda Anis, Oct 10, 2018, 4 replies, in forum: Advanced Physics Homework
  3. asimov42
    Thread

    I Dressed electrons are not defined as point masses...

    In @A. Neumaier 's excellent Physics FAQ, he notes under "Are electrons pointlike/structureless?" that "Physical, measurable particles are not...
    Thread by: asimov42, Sep 21, 2018, 24 replies, in forum: Quantum Physics
  4. Pouyan
    Thread

    Finding state vectors for pure states!

    1. The problem statement, all variables and given/known data Is the following matrix a state operator ? and if it is a state operator is it a pure...
    Thread by: Pouyan, Sep 8, 2018, 1 replies, in forum: Advanced Physics Homework
  5. Dazzabaijan
    Thread

    I Finding expansion coefficient of a 3-d Gaussian wave packet

    I'm having trouble with trying to find the expansion coefficients of a superposition of a Gaussian wave packet. First I'm decomposing a Gaussian...
    Thread by: Dazzabaijan, Aug 18, 2018, 12 replies, in forum: Quantum Physics
  6. Phys12
    Thread

    I Why do you need infinite size matrix which commute...

    ...to give a number? https://ocw.mit.edu/courses/physics/8-04-quantum-physics-i-spring-2016/lecture-notes/MIT8_04S16_LecNotes5.pdf On page 6, it...
    Thread by: Phys12, Aug 5, 2018, 2 replies, in forum: Quantum Physics
  7. Safder Aree
    Thread

    Wave packet width given a wave function

    1. The problem statement, all variables and given/known data Find the wave packet Ψ(x, t) if φ(k) = A for k0 − ∆k ≤ k ≤ k0 + ∆k and φ(k) = 0 for...
    Thread by: Safder Aree, Jun 13, 2018, 2 replies, in forum: Introductory Physics Homework
  8. Safder Aree
    Thread

    Harmonic Oscillator violating Heisenberg's Uncertainity

    1. The problem statement, all variables and given/known data Does the n = 2 state of a quantum harmonic oscillator violate the Heisenberg...
    Thread by: Safder Aree, Jun 12, 2018, 8 replies, in forum: Introductory Physics Homework
  9. JordanPolla
    Thread

    I Can something be caused and be ontologically random?

    Or does ontological probability exist? I was reading an article that came up in my google searches (...
    Thread by: JordanPolla, May 27, 2018, 2 replies, in forum: Quantum Physics
  10. Giulio Prisco
    Thread

    I Einstein-Bohr "photon box" debate and general relativity

    I see this has been already discussed but the old threads are closed. EPR before EPR: a 1930 Einstein-Bohr thought experiment revisited "In this...
    Thread by: Giulio Prisco, Apr 24, 2018, 12 replies, in forum: Quantum Physics
  11. Greg Bernhardt
    Thread

    Insights Interview with Astrophysicist: Adam Becker - Comments

    Greg Bernhardt submitted a new PF Insights post Interview with Astrophysicist: Adam Becker [ATTACH] Continue reading the Original PF Insights Post.
    Thread by: Greg Bernhardt, Mar 24, 2018, 132 replies, in forum: Quantum Physics
  12. Jeffrey phalen
    Thread

    B Reason for the speed of light

    Is it possible that the speed of light exists because we cannot move faster than our particles? I.e. the speed of electrons that create the...
    Thread by: Jeffrey phalen, Mar 22, 2018, 16 replies, in forum: General Physics
  13. Arik Salehi
    Thread

    B Explanation of Quantum Entanglement Please

    Hello, I am 12 years old in 6th grade and love physics and Quantum Physics, I would love an explanation of Quantum Physics and Topological Quantum...
    Thread by: Arik Salehi, Mar 7, 2018, 4 replies, in forum: Quantum Physics
  14. Jianphys17
    Thread

    I Particles as matter waves

    Hi at all, i've the following question: How the fondamental particles (electrons, protons) are seen as matter waves, what shape and size should be...
    Thread by: Jianphys17, Feb 15, 2018, 5 replies, in forum: Quantum Physics
  15. sha1000
    Thread

    A Wavelength of the pilot wave

    Hi, I am new to the Pilot Wave theory. In my understanding this theory gives a hope for reconstruction of the realism. But I have several maybe...
    Thread by: sha1000, Jan 19, 2018, 4 replies, in forum: Quantum Physics
  16. NessunDorma
    Thread

    A Why do space translations satisfy the Wigner's Theorem?

    Some books argue that typical coordinate transformations such as space translations and rotations are represented in quantum mechanics by unitary...
    Thread by: NessunDorma, Dec 28, 2017, 7 replies, in forum: Quantum Physics
  17. Abu
    Thread

    B Planck-Einstein relation and the Photoelectric Effect

    Hi everyone, I just have some confusion regarding Planck's and Einstein's equation. The following is an explanation of the photoelectric effect...
    Thread by: Abu, Dec 16, 2017, 3 replies, in forum: Quantum Physics
  18. Bananen
    Thread

    Derive the relation between the P & R branches

    Hi, I have an assignment to derive the two following expressions: R(J)-P(J)=2B'(2J+1) R(J-1)-P(J+1)=2B''(2J+1) where Bis the rotational constant...
    Thread by: Bananen, Dec 4, 2017, 2 replies, in forum: Advanced Physics Homework
  19. Jacques Marrot
    Thread

    B Quantum Teleportation Question from a Curious 10 year old

    I am doing a GT project for elementary school. The questions I have to ask are not too complicated, and I only have 2 questions. I know that...
    Thread by: Jacques Marrot, Dec 1, 2017, 14 replies, in forum: Quantum Physics
  20. mr1batman
    Thread

    How can i start in quantum physics and quantum mechanics?

    i want an article or video that i can start with at the journy of understanding the basics of quantum physics and quantum mechanics i don't want...
    Thread by: mr1batman, Nov 4, 2017, 10 replies, in forum: Academic Guidance
  21. nnope
    Thread

    Point me in the right direction -- Quantum Physics learning resources

    I am trying to learn all about Quantum Physics on my own but I am struggling to find credible sources of information. As you are probably aware...
    Thread by: nnope, Oct 7, 2017, 9 replies, in forum: Academic Guidance
  22. nnope
    Thread

    B Entanglement, what is it?

    I dont have much of a background in quantum physics so be patient with my questions please. Basically I want to know how does entanglement...
    Thread by: nnope, Oct 1, 2017, 79 replies, in forum: Quantum Physics
  23. Randall B
    Thread

    My Introduction

    Hi All, I am brand new here, still trying to navigate the website so please forgive me if this is not the appropriate space for the following. I...
    Thread by: Randall B, Sep 29, 2017, 1 replies, in forum: New Member Introductions
  24. asimov42
    Thread

    A Observable particles as asymptotic states...

    I've read Arnold Neumaier's excellent Insight article on virtual particles, but I'm very confused about one thing: Observable particles are...
    Thread by: asimov42, Sep 20, 2017, 47 replies, in forum: Quantum Physics
  25. ProgrammingGodJordan
    Thread

    A ‘Transverse Field Ising Spin’-compatible Super Hamiltonian

    Is it possible to create a ‘Transverse Field Ising Spin’-compatible Super Hamiltonian? I want to apply the Super Hamiltonian to this paper:...
    Thread by: ProgrammingGodJordan, Sep 8, 2017, 2 replies, in forum: Quantum Physics
  26. Daria K
    Thread

    B Does this theorem “theoretically” falsify macrorealism?

    Hello! Recently I found this article: http://quantum-journal.org/papers/q-2017-07-14-13/pdf/ Being familiar with some basis of quantum...
    Thread by: Daria K, Aug 19, 2017, 3 replies, in forum: Quantum Physics
  27. KBon
    Thread

    I Does the wave function shorten when approaching light speed?

    Relative to the observer, objects shorten when approaching the speed of light exponentially. Does this rule also apply to the wave function? Does...
    Thread by: KBon, Aug 8, 2017, 2 replies, in forum: Quantum Physics
  28. KBon
    Thread

    B Are there Hadrons with more than three quarks?

    As far as I know there are Mesons (quark-Antiquark pair) and Baryons (three quarks). But are there Hadrons which contain more than 3 Quarks?
    Thread by: KBon, Aug 3, 2017, 8 replies, in forum: High Energy, Nuclear, Particle Physics
  29. KBon
    Thread

    A theorist has joined the game

    Hey there! My name is Karol and I am 16 years old. I joined the Physics Forums becuause I have many questions and ideas on how the universe might...
    Thread by: KBon, Aug 3, 2017, 3 replies, in forum: New Member Introductions
  30. smartypants123
    Thread

    B What is an electrostatic/Coulomb barrier? How is it created?

    I learned that for nuclear fusion to take place, particles must overcome the electrostatic field but what exactly is it? And how is it created/formed?
    Thread by: smartypants123, Aug 2, 2017, 4 replies, in forum: General Physics
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