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5706e24f875a6557 | A few quick announcements
I gave a new survey talk at Yale, entitled “When Exactly Do Quantum Computers Provide a Speedup?” Here are the PowerPoint slides. Thanks so much to Rob Schoelkopf for inviting me, and to everyone else at Yale for an awesome visit.
Aephraim Steinberg asks me to announce that the call for no... |
702b431b4ada3cec | TY - JOUR ID - 10442/16910 A1 - Tzeli D. A1 - A1 - Mercouris T. A1 - A1 - Theodorakopoulos G. A1 - A1 - Petsalakis I.D. Y1 - 2017/// T1 - Time-evolution study of photoinduced charge-transfer in tertiary amine-fluorophore systems JF - Computational and Theoretical Chemistry VL - 1115 SN - 2210-271X U3 - 10.1016/j.comptc... |
46c776004f3b5e20 | Hotson D
### Hotson, D.L.: (page created at November 2007 update)
## Diracs Equation and the Sea of Negative Energy, ISSUE 43, 2002 – I n f i n i t e E n e r g y Magazine from ‘HotsonPart1.pdf’, 286kb, 20 pages
Diracs Equation has profound implications both for science and for the search for new energy. If we con... |
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Condensed Matter
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[1] arXiv:2208.05490 [pdf, other]
Title: Quadrupolar excitons in a tunnel-coupled van der Waals heterotrilayer
Strongly bound e... |
d450e2ac19c25447 | Frank Znidarsic 2
##Znidarsic, Franck P.E, PART 2:
# Online preview of historic of “Zero Point Technologies” : (Open the original pages links to see the numerous pictures and videos)
(see picture on original webpage) This author conducts a cryogenic zero point energy experiment. The results were published by Hal Fo... |
a54d743faf112c3f | Singularity structure of Møller - Plesset perturbation theory
D. Z. Goodson and A. V. Sergeev
Møller-Plesset perturbation theory expresses the energy as a function E(z) of a perturbation parameter, z. This function contains singular points in the complex z-plane that affect the convergence of the perturbation series... |
aea873b4bcd6a7ea | What Kind of Writer Do I Want to Be?
Today’s post is about a personal revelation I recently had. You see, I spend a lot of time researching for this blog, making sure I understand what I’m talking about, and doing my best to explain it all clearly and concisely. And all this work, in theory, is supposed to benefit m... |
095b73bc091c4366 | Tuesday, May 3, 2016
Are Single-World Interpretations of Quantum Theory Inconsistent?
A recent eprint caught my atention: Single-world interpretations of quantum theory cannot be self-consistent by Daniela Frauchiger and Renato Renner. In the abstract we read
We find that, in such a scenario, no single-world interpre... |
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Do i need differential equations?
1. Mar 13, 2015 #1
A friend recently gave me a book on quantum mechanics. It's called Introduction to quantum mechanics. It's by David j griffiths.
I am currently taking multivariable calc.I am taking linear alg... |
edcebb5afb40b3b6 | Take the 2-minute tour ×
In quantum mechanics when we talk about the wave nature of particles are we referring in fact to the wave function? Does the wave function describes the probability of finding a particle (ex: photons) at some location? So do the "waves" describe probabilities just the way in classical physics ... |
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I can think of several, not necessarily contradictory, possibilities:
Would anyone care to explain how this issue is resolved?
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Related: and links therein. – Qmechanic Jan 27 '13 at 18:17
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96d136b13fb526f0 | quantum mechanics
the nontrivial Riemann zeta zeros interpreted as a spectrum of energy levels
"The Riemann zeta function is of interest to pure mathematicians because of its connection with prime numbers, but it is also a hugely important tool in quantum chaos because many calculations involving the Riemann zeta func... |
9a034a6c4321f709 | From Wikipedia, the free encyclopedia
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Not to be confused with Graphite, Grapheme, Graphane, or Graphyne.
For an overview of two-dimensional materials such as graphene, see Single layer materials.
Graphene is pure carbon in the form of a very thin, nearly transparent sheet, one atom thick. I... |
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Quantum Cheshire Cat: Even Weirder Than Schrödinger’s
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Just when you thought you’d heard every quantum mystery that was possible, out pops another one. Jeff Tollaksen me... |
000dee61f79ef101 | Take the 2-minute tour ×
why do atoms not collapse on themselves. Doesnt this problem rule hidden variables as invalid as the heisenburg uncertainty is the solution to the problem because it says electrons exist in a probability cloud and is in many places at once, not at a single location. If hidden variables are rig... |
ecdc33f806011d7f | Take the 2-minute tour ×
I am stuck on a QM homework problem. The setup is this:
enter image description here
(To be clear, the potential in the left and rightmost regions is $0$ while the potential in the center region is $V_0$, and the wavefunction vanishes when $|x|>b+a/2$.) I'm asked to write the Schrödinger equ... |
0dc3574894489d5f | The tightrope of truth and courtesy
A reader calling him- or herself “A Merry Clown” left a comment on my previous post which was so wise, I decided it had to be promoted to a post of its own.
Scientific discourse is the art of juggling decorum, truth and humor. A high-wire feat, attempted under imposing shadows cast... |
a1b380afd01e5ea7 | Copyright © 2004 jsd
How to Draw Molecules ...
Just Like Lewis Dot Diagrams, Only Easier & Better
1 Introduction
Our primary goal for today is to be able to draw diagrams of molecules, such as we see in figure 1.
Figure 1: A Few Small Molecules
These diagrams tell us that the F2 molecule has a single bond, the CO... |
86e982a75b0932ea | Higgs field: Wikis
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From Wikipedia, the free encyclopedia
Quantum field theory
Feynmann Diagram Gluon Radiation.svg
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In particle physics, the Higgs mechanism is a theoretical framework which explains how the masses of the W and Z bosons arise th... |
a7fcacc407f2364a | Consciousness, Causality, and Quantum Physics
David Pratt
(Reprinted with permission from Journal of Scientific Exploration, 11:1, pp. 69-78, Spring 1997)
Abstract -- Quantum theory is open to different interpretations, and this paper reviews some of the points of contention. The standard interpretation of quantum p... |
4cc52670fdda7995 | My long, complexity-theoretic journey
So, what was I doing these past few weeks that could possibly take precedence over writing ill-considered blog entries that I’d probably regret for the rest of my life?
1. On the gracious invitation of Renato Renner, I visited one of Al Einstein’s old stomping-grounds: ETH Zürich... |
8049b7867c6970fd | Big Bad Quantum Computer Revisited
A recent DefenseNews article again put Shor's algorithm front and center when writing about Quantum Computing. Yet, there is so much more to this field, and with Lockheed Martin working with D-Wave one would expect this to be an open secret in the defence sector. At any rate, this ... |
cc9b5d57a2453c05 | Measurement problem
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The measurement problem in quantum mechanics is the problem of how (or whether) wavefunction collapse occurs. The inability to observe this process directly has given rise to different interpretations of quantum mechanics, and poses... |
774329a8669d90e3 | Feynman Diagrams for the Masses (part 1)
If you want to win a Nobel Prize in Physics by finding the unified field theory, it’s pretty obvious that you will have to learn how to make Quantum field theory (QFT) calculations. In the 1940s, Richard Feynman and Ernest Stueckelberg independently developed a notation (now kn... |
846c510bb112eb5c | Electronic correlation
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Electronic correlation is the interaction between electrons in the electronic structure of a quantum system.
Atomic and molecular systems[edit]
Electron correlation energy in terms of various levels of theory of solutions for t... |
5f1fe8f284c8db4a | Relational Quantum Mechanics
First published Mon Feb 4, 2002; substantive revision Wed Jan 2, 2008
Relational quantum mechanics is an interpretation of quantum theory which discards the notions of absolute state of a system, absolute value of its physical quantities, or absolute event. The theory describes the way sy... |
bcd3c3dc40c8880d | Orbital hybridisation
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Not to be confused with s-p mixing in Molecular Orbital theory. See Molecular orbital diagram.
In chemistry, hybridisation (or hybridization) is the concept of mixing atomic orbitals into new hybrid orbitals (with different energi... |
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Basic QM questions
1. Sep 10, 2004 #1
I have just started an introductory course on quantum mechanics, and there are some things that I can't figure out. Similar questions have probably been answered several times before, so links to other threads are very welcome (I c... |
19ec1913761a7639 | Take the tour ×
Consider a free-particle with a Gaussian wavefunction,
$$\psi(x)~=~\left(\frac{a}{\pi}\right)^{1/4}e^{-\frac12a x^2},$$ find $\psi(x,t)$.
The wavefunction is already normalized, so the next thing to find is coefficient expansion function ($\theta(k)$), where:
$$\theta(k)=\int_{-\infty}^{\infty} \psi... |
94dd1d0188c72bb3 | Take the tour ×
How do we normalize a wavefunction that's a linear combination of sines and cosines (or of $Ae^{ikx}+Be^{-ikx}$ -- they're the same, right)? One you square it, wouldn't the integrand be oscillating through all space, and thus infinite?
share|improve this question
Could you please specify which "things... |
efe767952845fba6 | Take the tour ×
The energy eigenstates of the infinite square well problem look like the Fourier basis of L2 on the interval of the well. So then we should be able to for example make square waves that are an infinite linear combination of those energy eigenstates. But since linear superpositions of solutions are solu... |
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b6a95d49c5e4d066 | EPR paradox
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Albert Einstein
The EPR paradox yields a dichotomy that physical reality as described by quantum mechanics is incomplete.
It is an early and influential critique levelled against the Copenhagen interpreta... |
9b88b0d8e6a35ba4 | Quantum Zeno effect
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The quantum Zeno effect is a situation in which an unstable particle, if observed continuously, will never decay.[1] The term was coined by George Sudarshan and Baidyanath Misra of the University of Texas in 1977. One can "freeze" t... |
24d79c70ecbd352d | Take the tour ×
Is the Born rule a fundamental postulate of quantum mechanics, or can it be inferred from unitary evolution?
share|improve this question
As the page about postulates you linked to correctly says, the Born-like rules to calculate probabilities from state vectors and operators are among the general post... |
d98fef9baf0a1513 | The Einstein-Podolsky-Rosen Argument in Quantum Theory
First published Mon May 10, 2004; substantive revision Tue Nov 5, 2013
1. Can Quantum Mechanical Description of Physical Reality Be Considered Complete?
1.1 Setting and prehistory
By 1935 the conceptual understanding of the quantum theory was dominated by Niel... |
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40b54b3f9fd44470 | Dear Reader,
Best regards,
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52Symmetry in Physical Laws
52–1Symmetry operations
The subject of this chapter is what we may call symmetry in physical laws. We have already discussed certain features of symmetry in physical laws in conne... |
6fb72ff9e24e5346 | Deceleration Formula
Deceleration FormulaAccelerator is the device used to measure both acceleration and deceleration. It is common to use acceleration to mean speeding up and the word deceleration to mean slowing down. Body start to accelerate and at some point it needs to start decelerating. 7 m from the speed that ... |
651a09c5fc021960 | New Monadology
Leibniz_Monadology_2The first manuscript page of the Monadology
Leibniz surmised that there are indefinitely many substances individually ‘programmed’ to act in a predetermined way, each substance being coordinated with all the others. This description of reality is elegant to the ear that believes Zeu... |
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Conceptually different from the decoherence program, in 2007 we introduced a novel theoretical approach to macroscopic realism and classical physics from within quantum theory [1]. It focuses on the limits of observability of quantum effects for macroscopic objects, i.e., on the required precision of our measurement ... |
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Mars Exploration Rover (MER) aeroshell, artistic rendition
Atmospheric entry is the movement of an object from outer space into and through the gases of an atmosphere of a planet, dwarf planet, or natural satellite. There are two main types of atmospheric entry: uncontrolled entry, such as the entr... |
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Quantum Dots : a True “Particle in a Box” System
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631654274c1c0d9e | NOT a duplictae, see EDIT below
It is common knowledge that the Schrödinger equation can be solved exactly only for the simplest of systems - such the so-called toy models (particle in a box, etc), and the Hydrogen atoms; and not for relatively complex systems, such as the Helium atom and other multielectron systems.
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krypy 2.1.2
Krylov subspace methods for linear systems
# KryPy [![Build Status]] [![doi]]
KryPy is a Python (versions 2 and 3) module for Krylov subspace methods for the solution of linear algebraic systems. This includes enhanced versions of CG, MINRES and GMRES as... |
971e81fd98023724 | The Reciprocal System of Physical Theory
The Reciprocal System of Physical Theory (RST) is a new system of physical theory in which the properties of all physical entities from the photons of radiation, to subatomic particles, to the atoms of elements, to galactic clusters, is deduced solely on the basis of the assump... |
777c1cc7776ba9b1 | Orbital hybridisation
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This article is about hybridisation in valence bond theory. For s-p mixing, see molecular orbital diagram.
Chemist Linus Pauling first developed the hybridisation theory in 1931 in order to explain the structure of simple molecu... |
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5b85704e9b8303a1 | Second Edition of the Textbook
The Front Cover Picture's Message to Principles of Physical Chemistry
A Comment by Hans Kuhn and Horst-Dieter Försterling
The picture symbolizes the importance of inventing simplifying models to treat complex phenomena. Such models are crucial in developing the modern topics considered ... |
5afb37b991387897 | Take the 2-minute tour ×
My question is in regards to the stance that the 'wave function collapse' is not an actual physical occurrence. That is, you are not, by observation, changing the particles position from a wave to a particle, it is merely that the wave function is the probability of finding the particle at a p... |
27a103958c99f46a | Divine Neutrality, Blog. Science, Philosophy
Measurement Problem
December 11th, 2007
A commonplace computational practice in quantum mechanics generates the most profound conceptual challenge to the theory. The challenge is called the measurement problem. Here are some quotes summarizing the problem.
“The quantum m... |
97d26de3face7324 | Saturday, December 08, 2012
TED Tries to Clean Up Its Act
Hello TEDx Community,
Please know this above all:
1. What an extremely heartening response to the criticism!!
2. The Alexander Tsiaras presentation that you wrote about didn't exactly fail your accuracy test, and it wasn't pseudoscience either. ... |
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d3b7102cf84abdbf | Chapter 1. Hydrogen-like atoms.
Chapter 1. Hydrogen-like atoms.
[Note]Development note
Chapter 2 through Chapter 4 are currently under active development.
The time-independent Schrödinger equation can be written as
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The Equations: Icons of Knowledge
Sander Bais
Harvard University Press
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David M. Bressoud
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The world is awash is popularizations of modern physics. Here is one more. The author writes clearly and incisively about the physical ideas, but so have other ... |
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Physics LibreTexts
4.2: Cartesian Symmetry
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11392f212c1f0782 | CHEM 125a: Freshman Organic Chemistry I
Lecture 14
- Checking Hybridization Theory with XH3
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Freshman Organic Chemistry I
CHEM 125a - Lecture 14 - Checking Hybridization Theory with XH3
Chapter 1. A Relationship between Hybridization and Molecular Struct... |
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