String theory requires the existence of extra spatial dimensions for its mathematical consistency. In realistic physical models constructed from string theory, these extra dimensions are typically compactified to extremely small scales.
A kilonova is a transient astronomical event that occurs in a compact binary system when two neutron stars or a neutron star and a black hole merge into each other. Kilonovae are thought to emit...
09 October 2017 1,024 2 View
A quark is an elementary particle and a fundamental constituent of matter. Quarks combine to form composite particles called hadrons, the most stable of which are protons and neutrons, the...
03 April 2016 9,103 33 View
In supergravity theories combining general relativity and supersymmetry, the gravitino is the gauge fermion supersymmetric partner of the hypothesized graviton. It has been suggested as a...
01 February 2016 5,565 6 View
The Carnot cycle is a theoretical thermodynamic cycle proposed by Nicolas Léonard Sadi Carnot in 1824 and expanded by others in the 1830s and 1840s. It can be shown that it is the most efficient...
10 November 2014 283 6 View
In 1994, Edward Witten of the Institute for Advanced Study and other researchers suggested that the five different versions of string theory might be describing the same thing seen from different...
05 June 2014 7,433 2 View
Randall–Sundrum models (also called 5-dimensional warped geometry theory) imagines that the real world is a higher-dimensional universe described by warped geometry. The models were proposed in...
05 June 2014 2,868 2 View
parallel universe or alternative reality is a hypothetical self-contained separate reality coexisting with one's own. A specific group of parallel universes is called a multiverse, although this...
05 June 2014 1,540 3 View
Photons are traditionally said to be massless. This is a figure of speech that physicists use to describe something about how a photon's particle-like properties are described by the language of...
04 May 2014 7,893 33 View
Faster-than-light communications and travel refer to the propagation of information or matter faster than the speed of light. Under the special theory of relativity, a particle (that has rest...
04 May 2014 992 4 View
A tachyon or tachyonic particle is a hypothetical massive particle that always moves faster than light. The complementary particle types are called luxon (always moving at the speed of light) and...
04 May 2014 7,829 7 View
If we map as a continuous motion an ionising electron (beginning its journey at n=1) in an H atom, a specific hyperbolic spiral appears (see animation). When we solve this spiral formula, we find...
07 August 2024 5,343 2 View
Let's say we have a standard, regular hexagonal honeycomb with a 3-arm primitive unit cell (something like the figure attached; the figure is only representative and not drawn to scale). The...
07 August 2024 1,937 1 View
Hi, I'm currently working on a project where I need to plot the atom-projected band structure using GPAW. I've been able to calculate the band structure for my material, but I'm having trouble...
07 August 2024 269 3 View
Hi all, my experimental XPS results shown that my C3N5 sample consists of N-H bond, hence in this case I should incorporate the N-H bond into my DFT modelling. However, I do notice several papers...
07 August 2024 8,414 2 View
In order to show people the beauty of control and enhance enthusiasm for learning control theories, are there any good simple systems or platforms to recommend?
05 August 2024 10,034 1 View
Exism movements after gaining power within liberal democracies under majority rule and independent rule of law system become permanent dictatorship threats, but why this is the case is not clear...
04 August 2024 8,125 3 View
Hello, everyone. I have tried to determine carrier motilities of some materials, by Density Functional Theory, using Quantum ESPRESSO. There are a few methods to do it, like a package called...
04 August 2024 8,894 1 View
I would like to calculate the formation energy of P2-Na0.67Fe0.5Mn0.5O2 based on DFT, what should I do step by step. Any help would be appreciated. Thanks.
29 July 2024 8,248 2 View
Since 2016 Brexit, the world needed to change the thinking behind traditional democracy as the democratic landscape changed, yet traditional democratic thinkers and actors have been acting as if...
28 July 2024 6,515 1 View
Perfect democracy thinking assumes no chaos so no need for independent rule of law system and liberal democracies assume the possibility of normal democratic chaos that can be sorted out by an...
28 July 2024 473 1 View