(graph theory) Cheeger constant (Riemannian geometry) Eigengap Spectral gap (physics) Spectral radius "Impossible-Seeming Surfaces Confirmed Decades After...

with a spectral gap is called a gapped Hamiltonian, and those that do not are called gapless. In solid-state physics, the most important spectral gap is for...

physics, an energy gap is often known more abstractly as a spectral gap, a term which need not be specific to electrons or solids. If an energy gap exists...

The Yang–Mills existence and mass gap problem is an unsolved problem in mathematical physics and mathematics, and one of the seven Millennium Prize Problems...

In solid-state physics and solid-state chemistry, a band gap, also called a bandgap or energy gap, is an energy range in a solid where no electronic states...

Koma, Tohru (22 April 2006). "Spectral Gap and Exponential Decay of Correlations". Communications in Mathematical Physics. 265 (3): 781–804. arXiv:math-ph/0507008...

discrete set over the independent variable, with band gaps between pairs of spectral bands or spectral lines. The classical example of a continuous spectrum...

mass gap is the greatest lower bound of the energy of any state which is orthogonal to the vacuum. The analog of a mass gap in many-body physics on a...

unsolved problems grouped into broad areas of physics. Some of the major unsolved problems in physics are theoretical, meaning that existing theories...

In physics, Planck's law (also Planck radiation law: 1305 ) describes the spectral density of electromagnetic radiation emitted by a black body in thermal...

Sirtori, Carlo (2002). "Bridge for the terahertz gap" (Free PDF download). Nature. Applied physics. 417 (6885): 132–133. Bibcode:2002Natur.417..132S...

such as the spectral function) and can also be formulated in a completely ab initio way. The GW approximation seems to provide band gaps of insulators...

core). Another prominent feature is the Hertzsprung gap located in the region between A5 and G0 spectral type and between +1 and −3 absolute magnitudes (i...

Spectroscopy and Astronomical Physics. It was intended that the journal would fill the gap between journals in astronomy and physics, providing a venue for publication...

extending the Bohr model of the atom. α quantified the gap in the fine structure of the spectral lines of the hydrogen atom, which had been measured precisely...

Fourier analysis, the most used spectral method in science, generally boosts long-periodic noise in the long and gapped records; LSSA mitigates such problems...

the gap in the energy eigenvalues (spectral gap) of the Hamiltonian. Specifically, if the system is to be kept in the ground state, the energy gap between...

parameters used to evaluate the quality of a detector and is often called the spectral response to reflect its wavelength dependence. It is defined as the number...

radiation Optical window Ozone layer Radiant energy Radiation Radio window Spectral imaging Spectroscopy V band W band Mehta, Akul (25 August 2011). "Introduction...

In condensed matter physics, the density of states (DOS) of a system describes the number of allowed modes or states per unit energy range. The density...

by showing that such systems have a one-dimensional photonic band-gap, a spectral range of large reflectivity, known as a stop-band. Today, such structures...

deep-red visible spectral line of the hydrogen atom with a wavelength of 656.28 nm in air and 656.46 nm in vacuum. It is the first spectral line in the Balmer...

In mathematical physics, the almost Mathieu operator, named for its similarity to the Mathieu operator introduced by Émile Léonard Mathieu, arises in...

ISBN 978-0-471-92804-1. Eggert, John; Biltz, Martin (1938-01-01). "The spectral sensitivity of photographic layers". Transactions of the Faraday Society...

given material suppresses radiation at all wavelengths except for certain spectral intervals, and Rubens detected wavelengths of sizes around 60 μm. The measured...

well-defined spectral emission lines. Manufacturers of optical glass in general define principal index of refraction at yellow spectral line of helium...

surface from which it is emanating, including its temperature and its spectral emissivity, as expressed by Kirchhoff's law. The radiation is not monochromatic...

"Sasers: resonant transitions in narrow-gap semiconductors and in exciton system in coupled quantum wells". Physics Letters A. 282 (6). Elsevier BV: 407–414...

dispersive prism can be used to break white light up into its constituent spectral colors (the colors of the rainbow) to form a spectrum as described in the...

will also have a width and shape that are primarily determined by the spectral density or the density of states of the system. Absorption lines are typically...