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f46f098a23d11646 | Research ArticlePHYSICS
Attosecond timing of electron emission from a molecular shape resonance
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Science Advances 31 Jul 2020:
Vol. 6, no. 31, eaba7762
DOI: 10.1126/sciadv.aba7762
Shape resonances, due to trapping of particles in potential barriers, are ubiquitous in nature. ... |
e575489c761e1952 | I'm trying to understand the Schrödinger equation and solving it a bit better, and I'm running into some doubts while coding, even though I am adapting the code to this situation. Also I tried asking this on the physics stack exchange and I was directed here. this is the situation I am trying to solve: enter image desc... |
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A review of three-dimensional waves on deep-water is presented. Three forms of three-dimensionality, namely oblique, forced and spontaneous types, are identified. An alternative formulation for these three-dim... |
48be2f2e5ef0fa72 | Saturday, April 8, 2017
Saturday Night Radio Drama - Philip Doherty - A Golden Triangle
Author Philip Doherty earns his second such award [ First Place in the the P. J. O'Connor Prize] with the interrupted monologues that make up A GOLDEN TRIANGLE; and a parallel double deployment in production features a distinguis... |
7f37292860a537f1 | Many-worlds interpretation
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Before many-worlds, reality had always been viewed as a single unfolding history. Many-worlds, however, views historical reality as a many-branched tree, wherein every possible quantum ... |
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Domains of major fields of physics
Physics deals with the combination of matter and energy. It also deals with a wide variety of systems, about which theories have been developed that are used by physicists. In general, theories are experimentally tested numerous times before they are acce... |
d778643d87ded1f4 | Take the 2-minute tour ×
I'm reading the Wikipedia page for the Dirac equation:
$J = -\frac{i\hbar}{2m}(\phi^*\nabla\phi - \phi\nabla\phi^*)$
with the conservation of probability current and density following from the Schrödinger equation:
$\nabla\cdot J + \frac{\partial\rho}{\partial t} = 0.$
The fact that the ... |
65df7d2d440b77d2 | Take the 2-minute tour ×
This answer of mine has been strongly criticized on the ground that it is no more than a philosophical blabbering. Well, it may well be. But people seem to be of the opinion that HUP alone does not ensure randomness and you need Bell's theorem and other features for the randomness in QM. Howev... |
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Though classical random walks have been studied for many years, research concerning their quantum analogues, quantum random walks, has only come about recently. Numerous simulations of both types of walks have been run and analyzed, and are generally well-und... |
cb7b7a7f911e760b |
Table of Contents
Section 13.1 - Rules of Randomness
Section 13.2 - Light As a Particle
Section 13.3 - Matter As a Wave
Section 13.4 - The Atom
Chapter 13. Quantum Physics
13.1 Rules of Randomness
a / In 1980, the continental U.S. got its first taste of active volcanism in recent memory with the eruption of Moun... |
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Quantum Refutations and Reproofs
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Quantum woo
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Dolphins and money
New Age
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Cosmic concepts
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If a sentence has the word "quantum" in it, and if it is coming out of a non-physicist's mouth, you can almost be certain that there's a huge quantum of BS be... |
05623c03bdbec063 | Back to namelist
Stoyan Kurtev
Wave-like patterns in behavioural data: evidence for quantum processes in the brain?
Numerosity estimation as a task for studying the behaviour of the mental state is analogous to probing properties of a particle state by measuring position and velocity using particle detectors. In tha... |
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Aether based explanation of dark matter
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b0ee164493084a6a | Cubical atom
From Wikipedia, the free encyclopedia
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The cubical atom was an early atomic model in which electrons were positioned at the eight corners of a cube in a non-polar atom or molecule. This theory was developed in 1902 by Gilbert N. Lewis and publish... |
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Winter, 2012
Quantum theory governs the universe at its most basic level. In the first half of the 20th century physics was turned on its head by the radical discoveries of Max Planck, Albert Einstein, Niels Bohr, Werner Heisenberg, and Erwin Schroedinger. An entire new logical and mathematical foun... |
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In just about every interpretation of quantum mechanics, there appears to be some form of dualism. Is this inevitable or not?
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Why do we consider evolution of a wave function and why is the evolution parameter taken as time, in QM.
If we look at a simple wave function $\psi(x,t) = e^{kx - \omega t}$, $x$ is a point in configuration space and $t$ is the evo... |
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Over at the theoretical physics beach party, Moshe is talking about teaching quantum mechanics, specifically an elective course for upper-level undergraduates. He’s looking for some suggestions of special topics:
The course it titled “Applications of quantum mechanics”, and is coveri... |
bbd32cbca0eec12c | Friday, April 20, 2012
Schrödinger has never met Newton
Sabine Hossenfelder believes that
Schrödinger meets Newton.
But is the story about the two physicists' encounter true?
Yes, these were just jokes. I don't think that Sabine Hossenfelder misunderstands the history in this way. Instead, what she completely misun... |
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d651f2edfbefea0a | Monday, May 17, 2010
Abramowitz/Stegun goes online
Did you ever need to learn about the properties of some obscure mathematical function which turns up when you try to solve, say, the Schrödinger equation with a linear potential?
In the times before Wikipedia and Eric Weisstein's World of Mathematics/MathWorld, the ... |
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When I read descriptions of the many-worlds interpretation of quantum mechanics, they say things like "every possible outcome of every event defines or exists in its own history or world", but is this really accurate? This seems to imply that the universe only split at particular moments when ... |
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By Philip L. Taylor
This reader-friendly advent to the idea that underlies the various attention-grabbing homes of solids assumes simply an straightforward wisdom of quantum mechanics. Taylor and Heinonen describe the equipment for appear... |
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Assuming time and space are continuous, identical quantum states seem impossible even without the principle. I guess saying something like: the closer the states are the less likely they are to exist, would make sense, but the principle is ... |
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6d5a15cf1230f98e | If television were the prime cause of illiteracy, then the remedy would be simple: Turn it off.
Anticipation – A Spooky Computation
Conference on Computing Anticipatory Systems (CASYS 99), Liege, Belgium, August 8-11, 1999
Mihai Nadin
Program in Computational Design
University of Wuppertal
Computer Science, Center... |
b394ac90cb093653 | Constitutional Paradox: Schrödinger’s Quantum Theory on Superposition
A Quantum superposition is a fundamental principle of quantum mechanics. It refers to a property of pure state solutions to the Schrödinger equation; since the Schrödinger equation is linear, any linear combination of solutions to a particular equ... |
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Condensed matter physics is a branch of physics that deals with the physical properties of condensed phases of matter,[1] where particles adhere to each other. Condensed matter physicists seek to understand the behavior of these phases by using physical laws. In particular, they include the... |
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Richard Feynman
From Wikipedia, the free encyclopedia
Richard Feynman
Richard Feynman Nobel.jpg
Born Richard Phillips Feynman
May 11, 1918
New York City
Died February 15, 1988 (aged 69)
Los Angeles, California
Residence United States
Nation... |
e87b209e62a7d0ac | December 9, 2005
Intellectual flirting
Transcribo dos páginas de la novela escocesa Mobius Dick, donde Andrew Crumey presenta un buen ejemplo del intellectual flirting. La novela, por lo demás, trata acerca de física cuántica, genialidad y locura, casualidad, azar y fortuna, y el Doppelgänger.
His affair with Helen ... |
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By Robert McCaughey
During this entire social heritage of Columbia University's tuition of Engineering and utilized technological know-how (SEAS), Robert McCaughey combines archival examine with oral testimony and modern interviews to construc... |
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Secret of Laser vs Secret of Piano
torsdag 28 juli 2016
New Quantum Mechanics 10: Ionisation Energy
Below are sample computations of ground states for Li1+, C1+, Ne1+ and Na1+ showing good agreement with table data of first ionisation energies of 0.2, 0.4, 0.8 and 0.2, respectively.
Not... |
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You remember last "Physics Friday" post: We showed a phase space map of a billiard in a magnetic fields as an example for a system showing classical chaos. As in classical Hamiltonian systems, the concept of integrability can also be applied to quantum systems. In the form of quantum n... |
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Qian Niu, Department of Physics, The University of Texas at Austin, Austin, TX 78712-0264, USA and International Center for Quantum Materials, Peking University, Beijing, China
Published June 11, 2012 | Physics 5, 65 (2012) | DOI: 10.1103/Physics.5.65
+Enlarge image Figure 1
(Lef... |
2ae6144808714671 | Critique of a Metaphysics of Process
demarcating things as they are
conventionally & ultimately
moving along swimmingly
Part I : General Metaphysics
I pay homage to Je Tsongkhapa
inspired by the profound philosophies of
Protector Nâgârjuna, Emmanuel Kant & Alfred North Whitehead
with thanks to Willem of Ockh... |
4c2e1b922e8efca9 | • Chemistry & Biochemistry
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1010C Essentials of General Chemistry 4 credits
Introduces students to the essential theories and principles of general chemistry and their application to modern society. Topics include chemical reactions, atomic and molecular structure, stoichiometry, bonding, the per... |
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BANKRUPTING PHYSICS by Alexander Unzicker
How Today's Top Scientists Are Gambling Away Their Credibility
by Alexander Unzicker, Sheilla Jones
Pub Date: July 30th, 2013
ISBN: 978-1-137-27823-4
Publisher: Palgrave Macmillan
With assistance from science writer Jones (The Quantum Ten, 2008), the... |
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1. In electrodynamics, the Coulomb gauge is specified by [tex]\nabla \cdot A=0 [/tex], i.e., the 3-divergence of the 3-vector potential is zero.
This condition is not Lorentz invariant, so my first question is how can something that is not Lorentz invariant be allowed in the laws of physics?
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by Jorge Cham
– “I don’t remember anything I learned in college”
Screen Shot 2013-06-11 at 12.15.21 AM
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Watch the first installment of this series:
Transcription: Noel Dilworth
Thanks to: Spiros Micha... |
2c3aa17957001a5c | From Wikipedia, the free encyclopedia
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Stylised atom with three Bohr model orbits and stylised nucleus.png
Lithium atom model
Showing nucleus with four neutrons (blue),
three protons (red) and,
orbited by three electrons (black).
Smallest recognised division of a chemical element
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Do you already believe in emergent gravity?
Popular writer Sabine Hossenfelder gave a highly authoritative explanation for what emergent gravity is (see this). Actually, she started by bravely expanding the notion of emergence: not only gravitation but also free will, cell, and brain emer... |
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DNA as topological quantum computer: XIV
I have worked hardly in refining the chapters about quantum biology in TGD Universe. DNA as topological quantum computer was the original idea that has generalized considerably and led to a beautiful unification of various basic ideas. I attach below th... |
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In physics, relativistic quantum mechanics (RQM) is any Poincaré covariant formulation of quantum mechanics (QM). This theory is applicable to massive particles propagating at all velocities up to those comparable t... |
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07 September 2016
Could dark matter be super cold neutrinos?
Probably the greatest physics problems of the current generation are the cosmological questions. Thanks to the development of powerful new telescopes (many of them in space) in the last years of the twentieth century, startling new a... |
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DeBroglie equation applied to atoms & molecules: not so obvious
1. Jun 29, 2014 #1
One of the first things about QM we were taught in my undergraduate physics program is the deBroglie relation:
λ = h/p
Now, it makes sense that that this might hold for all eleme... |
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Mr Clay and a Meaningless Navier-Stokes Prize Problem
Turbulent flow around a landing gear as non-smooth solution of the 3d incompressible Navier-Stokes equations, by CTLab KTH. Watch also turbulent flow around an airplane in landing configuration. To argue that these flows are smooth would be a m... |
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Haven’t been posting for a while, but here’s something new… Earlier I showed how to solve the 1D Schrödinger equation numerically in different situations. Now I’m going to show how to calculate the evolution of a 2D wavepacket in a potential energy field tha... |
fabe20b2be5f8d34 | The Unabashed Academic
07 September 2016
Could dark matter be super cold neutrinos?
Probably the greatest physics problems of the current generation are the cosmological questions. Thanks to the development of powerful new telescopes (many of them in space) in the last years of the twentieth century, startling new a... |
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Question about schrodinger equation
1. Dec 11, 2006 #1
Note that this is not homework... im just curious
The time independant Schrodinger equation can be written as
[tex] \hat{H} \psi = E\psi[/tex]
IS there ever a time taht the above equation is not true??... |
056483605f1dbda1 | Take the 2-minute tour ×
Following up on the previous MO question "Are there any important mathematical concepts without discrete analogue?", I'd like to ask the opposite: what are examples of notions in math that were not originally discrete, but have good discrete analogues? While a few examples arose in the answers... |
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All of us have probably been exposed to questions such as: "What are the applications of group theory...". This is not the subject of this MO question.
Here is a little newspaper article that I found inspiring:
Madam, – In response to Marc Morgan’s question, “Does mathematics have any practi... |
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a framework for simulating open quantum dynamics – generic elements
Table of supported general-purpose elements
This is a list of general-purpose free and interaction elements (residing in CPPQEDelements), that are supported in the framework, meaning that they will always remain an integ... |
bdb365a5db85c731 | Physicist, Startup Founder, Blogger, Dad
Wednesday, April 23, 2008
Feynman and Everett
A couple of years ago I gave a talk at the Institute for Quantum Information at Caltech about the origin of probability -- i.e., the Born rule -- in many worlds ("no collapse") quantum mechanics. It is often claimed that the Born ... |
c87d32864b1a9e83 | Skip to content
Open Access
Models in biology: ‘accurate descriptions of our pathetic thinking’
BMC Biology201412:29
Received: 3 February 2014
Published: 30 April 2014
In this essay I will sketch some ideas for how to think about models in biology. I will begin by trying to dispel the myth that quantitative mod... |
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Psychic Contributions to Physics
Extrasensory Perception of Subatomic Particles (PDF), (HTML)
Abstract - A century-old claim by two early leaders of the Theosophical Society to have used a form of ESP to observe subatomic particles is evaluated. Their observations are found to be consistent wi... |
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Quantum Contradictions 2: Pauli Exclusion Principle
Wolfgang Pauli stated in General Principles of Quantum Mechanics (1958) on the Pauli Exclusion Principle (PEP):
• The fact that quantum mechanics yields more states than actually occur in nature (multiD wave function), is still a puzzle and it i... |
34e4129bf794eba8 | Saturday, August 4, 2012
Orthogonal: Riemannian Quantum Mechanics [Extra] - Greg Egan
"Units Throughout these notes, we've adopted a system where time and distance are measured in identical units. This is the equivalent of setting the speed of light, c, equal to 1 in our own universe (for example, by measuring distan... |
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Give a Guy a Hammer ...
Mathematician Max Tegmark thinks the fundamental reality is math. A review of Our Mathematical Universe.
The unknown seems to drive us into conniptions, whether one's habit of thought is theology, science, or formal philosophy. The idea that the fundamental reality of o... |
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quinta-feira, agosto 18, 2016
Quantum asymmetry between time and space
Joan A. Vaccaro
Published 20 January 2016. DOI: 10.1098/rspa.2015.0670
Prof. Joan Vaccaro - Source/Fonte: Griffith University
An asymmetry exists between time and space in the sense that physical... |
bb9c8930aaa31b35 | Cover Story
Unlike linear waves, solitons create their own channel as they travel in a uniform medium, remaining localized and preserving their shape. Whereas linear waves always pass through one another, solitons can be dramatically altered by... more>>
Massive Soliton WDM Transmission at N × 10 Gbit/sec, Error-fre... |
39ccea1cae9d1f94 | Share This
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Gabriella has a calling to understand how things work, capture the beauty of these processes, and exp... |
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From Wikipedia, the free encyclopedia
Quantum mechanics
Uncertainty principle
Introduction · Mathematical formulation
Fundamental concepts
Quantum state · Wave function
Superposition · Entanglement
Measurement · Uncertainty
Exclusion · Duality
Decoherence · Ehrenfest theorem · Tunnelling
... |
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At all." The design of the hatches only allowed for a static pressure of less t... |
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Effective Nonlinear Coefficient
Definition: a coefficient for quantifying the strength of a nonlinear interaction
German: effektiver nichtlinearer Koeffizient
Category: nonlinear optics
How to cite the article; suggest additional literat... |
746ab51cc8ea89b7 | Remark: All the answers so far have been very insightful and on point but after receiving public and private feedback from other mathematicians on the MathOverflow I decided to clarify a few notions and add contextual information. 08/03/2020.
I recently had an interesting exchange with several computational neuroscie... |
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Post scriptum note added on 11 July 2016: This is one of the more speculative posts which led to my e-publication analyzing the wavefunction as an energy propagation. With the benefit of hindsight, I would recommend you to immediately the more recent exposé on the matter that is... |
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PDF version… | Download Code… | DOI
1 Introduction
We are interested in the numerical discretization of the Kolmogorov equation [12]
(1) \begin{equation*} \left\{ \begin{array}{lll} \partial_t f - \mu \partial_{xx} f - v(x) \partial_y f =0, & (x,y)\in\R^2, t>0,\\ f(x,y,0) =f... |
218788515413fe37 | Aneesur Rahman Prize for ETH-Zurich professor Matthias Troyer
Matthias Troyer, a professor of computational physics at ETH Zurich, has received the Aneesur Rahman Prize 2016 for outstanding achievements in his field. As the Selection Committee stated, Troyer was honoured for his ground-breaking work in many “seemingly... |
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Author Affiliations +
J. of Nanophotonics, 11(3), 036016 (2017). doi:10.1117/1.JNP.11.036016
In the race to realize ultrahigh-speed processors, silicon photonics research is part of the efforts. Overcoming the sili... |
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The periodic table of elements is among the corner stones of chemistry. In the given order, in both the periods (rows) and groups (columns), elements show some specific properties. However, when going around the bottom of the periodic table (transitions metals) few el... |
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By Sean Carroll | April 16, 2012 8:20 am
Several different things (all pleasant and work-related, no disasters) have been keeping me from being a good blogger as of late. Last week, for example, we hosted a visit by Andy Albrecht from UC Davis. Andy is one of the pioneers of infl... |
6fffad28d21de508 | A+ A A-
Chemical Dynamics and Kinetic Modelling
In recent years, quantum chemistry has become truly accurate, with uncertainties comparable to typical uncertainties in many experiments. This should be leading to a complete transformation of chemistry, but so far it has not. A major cause of this failure has been that... |
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Line-Shape Code Comparison through Modeling and Fitting of Experimental Spectra of the C ii 723-nm Line Emitted by the Ablation Cloud of a... |
c112e36a100a3e63 | Quantum Mechanics(QM) from Special Relativity(SR)
A physical derivation of Quantum Mechanics (QM) using only the assumptions of Special Relativity (SR) as a starting point...
Quantum Mechanics is not only compatible with Special Relativity, QM is derivable from SR!
The SRQM Interpretation of Quantum Mechanics
SiteMap... |
8cf4a66c0b7a791e | Take the 2-minute tour ×
In order to calculate the cross-section of an interaction process the following formula is often used for first approximations:
$$ \sigma = \frac {2\pi} {\hbar\,v_i} \left| M_{fi}\right|^2\varrho\left(E_f\right)\,V $$ $$ M_{fi} = \langle\psi_f|H_{int}|\psi_i\rangle $$
Very often plane waves ... |
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A Florida State University high performance computing researcher has predicted a physical effect that would help physicists and astronomers provide fresh evidence of the correctness of Einstein’s ge... |
5a6324856126009a | Singularities and Black Holes
First published Mon Jun 29, 2009
A spacetime singularity is a breakdown in the geometrical structure of space and time. It is a topic of ongoing physical and philosophical research to clarify both the nature and significance of such pathologies. Because it is the fundamental geometry tha... |
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This article is about the chemistry of hydrogen. For the physics of atomic hydrogen, see Hydrogen atom. For other uses, see Hydrogen (disambiguation).
Hydrogen, 1H
Hydrogen discharge tube.jpg
Purple glow in i... |
f79564053088c8e8 | Take the 2-minute tour ×
I saw this video of the double slit experiment by Dr. Quantum on youtube. Later in the video he says, the behavior of the electrons changes to produce double bars effect as if it knows that it is being watched or observed.
What does that mean? How is that even possible? An atom knows if it is... |
51eb3d8608746955 | A Deleuzean Move
June 24, 2012 § Leave a comment
It is probably one of the main surprises in the course of
growing up as a human that in the experience of consciousness we may meet things like unresolvable contradictions, thoughts that are incommensurable, thoughts that lead into contradictions or paradoxes, or thou... |
00951602e3b7eab5 | Heat equation
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In this example, the heat equation in two dimensions predicts that if one area of an otherwise cool metal plate has been heated, say with a torch, over time the temperature of that area will gradually dec... |
d3b2f37d8e99683c | A Single 3N-Dimensional Universe: Splitting vs. Decoherence
A common way of viewing Everettian quantum mechanics is to say that in an act of measurement, the universe splits into two. There is a world in which the electron has x-spin up, the pointer points to “x-spin up,” and we believe the electron has x-spin up. The... |
ad17a9714b8b12cd | Take the 2-minute tour ×
I'm an undergraduate mathematics student trying to understand some quantum mechanics, but I'm having a hard time understanding what is the status of the Schrödinger equation.
In some places I've read that it's just a postulate. At least, that's how I interpret e.g. the following quote:
(fro... |
734a5d5dd1db6dd7 | Take the 2-minute tour ×
The uncertainty principle (UP) comes up in engineering and physics, but it is a mathematical idea. An old text describes it as "reciprocal spreading." If $f$ is a well-behaved function, the UP might be expressed as $W(f)W(\hat{f}) \geq k$, where $k$ is some constant. If $g$ is a Gaussian, we g... |
583e15b321caa724 | Will the real god God please stand up?
There are many reasons why I’m not retired, but one of the bigger ones is that I haven’t figured out yet how to get at least a quarter (if not a dollar bill) from every person who’s ever asked me how I can believe in “a god or gods” in an age of “science” and “reason”. The questi... |
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krypy 2.1.6
Krylov subspace methods for linear systems
KryPy gives you an easy-to-use yet flexible interface to Krylov subspace methods for linear algebraic systems. Compared to the implementations in SciPy (or MATLAB), KryPy allows you to supply additional arguments that may he... |
761f350079c76904 | Sunday, January 31, 2016
The Greatest Guitar Player You Probably Never Heard Of
Danny Gatton began his career playing in bands while still a teenager. He began to attract wider interest in the 1970s while playing guitar and banjo for the group Liz Meyer & Friends. He made his name as a performer in the Washington, ... |
f30b108a0431ab17 | Take the 2-minute tour ×
I am basically a Computer Programmer, but Physics has always fascinated and often baffled me.
I have tried to understand probability density in Quantum Mechanics for many many years. What I understood is that Probability amplitude is the square root of the probability of finding an electron a... |
5103f6e47434435e | Translate this page in your language
Thursday, December 8, 2011
Hydrogen is the chemical element with atomic number 1. It is represented by the symbol H. With an average atomic weight of 1.00794 u (1.007825 u for Hydrogen-1), hydrogen is the lightest and most abundant chemical element, constituting roughly 75% of t... |
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Measuring angular momentum in atomic systems
1. Oct 30, 2008 #1
Perhaps rather an elementary question, but I can't find a clear answer in my textbooks:
Would I be right in thinking that we never actually measure directly the angular momentum of atomic systems, but ... |
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