Making the universe safe for historians: Time travel and the laws of
... in the case of deformed static wormholes) in such processes. Neither of these assstunptions need necessarily be valid. Singularities one usuMly envisages axe the type that inhabit the event horizons of black holes: points at which the scalar curvature and tidal forces diverge. Because our mathematic ...
... in the case of deformed static wormholes) in such processes. Neither of these assstunptions need necessarily be valid. Singularities one usuMly envisages axe the type that inhabit the event horizons of black holes: points at which the scalar curvature and tidal forces diverge. Because our mathematic ...
File
... 70kg person lands on firm ground after jumping from a height of 3.0m. Then estimate the average force exerted on the person’s feet by the ground, if the landing is stiff-legged and again with bent legs. With stiff legs the body moves 1cm during impact. With bent legs the ...
... 70kg person lands on firm ground after jumping from a height of 3.0m. Then estimate the average force exerted on the person’s feet by the ground, if the landing is stiff-legged and again with bent legs. With stiff legs the body moves 1cm during impact. With bent legs the ...
= ∫ ∫ - at www.arxiv.org.
... measurability at the macroscopic level [40] is beyond any doubt. But there is well-founded doubt [41] that the Leggett-Garg inequality [40] can reveal a contradiction of experimental results with macroscopic realism. In spite of similar mathematical forms of the LeggettGarg [40] and Bell’s [42,43] i ...
... measurability at the macroscopic level [40] is beyond any doubt. But there is well-founded doubt [41] that the Leggett-Garg inequality [40] can reveal a contradiction of experimental results with macroscopic realism. In spite of similar mathematical forms of the LeggettGarg [40] and Bell’s [42,43] i ...
Hirota dynamics of quantum integrability
... • No single analyticity friendly gauge for T’s of right, left and upper bands. We parameterize T’s of 3 bands in different, analyticity friendly gauges, also respecting their reality and certain symmetries. • Quantum analogue of classical ...
... • No single analyticity friendly gauge for T’s of right, left and upper bands. We parameterize T’s of 3 bands in different, analyticity friendly gauges, also respecting their reality and certain symmetries. • Quantum analogue of classical ...
Two-dimensional electron gas in InGaAs/ InAlAs quantum wells E. Diez
... Fermi energy兲. Hence, DX centers could explain the observed increasing of both the 2DEG density and of the scattering rate with increasing temperature. Indeed, at higher temperatures, more carriers are activated, which will also leave the DX centers unsaturated and lead to the increased scattering r ...
... Fermi energy兲. Hence, DX centers could explain the observed increasing of both the 2DEG density and of the scattering rate with increasing temperature. Indeed, at higher temperatures, more carriers are activated, which will also leave the DX centers unsaturated and lead to the increased scattering r ...
Chapter 13 Ideal Fermi gas
... which defines the degenerate Fermi gas. In this limit, the quantum mechanical nature of the system becomes especially important, and the system has little to do with the classical ideal gas. Since this chapter is devoted to fermions, we shall omit in the following the subscript (−) that we used for ...
... which defines the degenerate Fermi gas. In this limit, the quantum mechanical nature of the system becomes especially important, and the system has little to do with the classical ideal gas. Since this chapter is devoted to fermions, we shall omit in the following the subscript (−) that we used for ...
Inertial mass and the quantum vacuum fields
... has been used so far to develop the hypothesis connecting inertia and the quantum vacuum is a semi-classical one (stochastic electrodynamics), the objective is congruent with that of quantum field theory: we are seeking an origin of inertia based on the properties of a quantum field, although thus f ...
... has been used so far to develop the hypothesis connecting inertia and the quantum vacuum is a semi-classical one (stochastic electrodynamics), the objective is congruent with that of quantum field theory: we are seeking an origin of inertia based on the properties of a quantum field, although thus f ...
Document
... Amplitude of interference fringes is a quantum operator. The measured value of the amplitude will fluctuate from shot to shot. We want to characterize not only the average but the fluctuations as well. ...
... Amplitude of interference fringes is a quantum operator. The measured value of the amplitude will fluctuate from shot to shot. We want to characterize not only the average but the fluctuations as well. ...
Large quantum superpositions of a levitated nanodiamond through spin-optomechanical coupling
... 2.4 MHz between the |+1|Dm /2nm and |−1|−Dm /2nm components, which is much larger than the typical transition linewidth of the NV spin (in the order of kHz). So we can apply first an impulsive microwave pulse to transfer the component state |+1|Dm /2nm to |0|Dm /2nm without affecting |−1|−D ...
... 2.4 MHz between the |+1|Dm /2nm and |−1|−Dm /2nm components, which is much larger than the typical transition linewidth of the NV spin (in the order of kHz). So we can apply first an impulsive microwave pulse to transfer the component state |+1|Dm /2nm to |0|Dm /2nm without affecting |−1|−D ...
Impact and Momentum - definition and units
... F dt. For motion in one dimension only, F = F i, v = vi dv and if we integrate Newton’s second law of motion, F = m , with respect to time, we obtain: dt Z ...
... F dt. For motion in one dimension only, F = F i, v = vi dv and if we integrate Newton’s second law of motion, F = m , with respect to time, we obtain: dt Z ...
Impact and Momentum - definition and units
... 3. A badmington player hits a shuttlecock, that came over the net at 32 m s−1 , back in the same direction that it came from, with a velocity of 28 m s−1 . If the shuttlecock has a mass of 40 grams, what is the impulse that the player (through the racket) imparts on the shuttlecock? 4. A bus, of mas ...
... 3. A badmington player hits a shuttlecock, that came over the net at 32 m s−1 , back in the same direction that it came from, with a velocity of 28 m s−1 . If the shuttlecock has a mass of 40 grams, what is the impulse that the player (through the racket) imparts on the shuttlecock? 4. A bus, of mas ...
University of London Physics MSci STUDENT HANDBOOK
... Each course has a code number used by the Intercollegiate MSci board, shown at the left hand side. Colleges use local codes for the courses they teach. The number is usually the same as the MSci code, but some are different; beware! All courses are a half course unit (15 credits). In QMUL language, ...
... Each course has a code number used by the Intercollegiate MSci board, shown at the left hand side. Colleges use local codes for the courses they teach. The number is usually the same as the MSci code, but some are different; beware! All courses are a half course unit (15 credits). In QMUL language, ...
Notes on Logarithms
... base 12, which would have made a lot of arithmetic much easier. Other bases have been used. The ancient Babylonians, for example, are said to have counted to base 60, though perhaps only a few of them did much counting at all. Base 10 for logarithms was chosen for convenience in arithmetic, but it w ...
... base 12, which would have made a lot of arithmetic much easier. Other bases have been used. The ancient Babylonians, for example, are said to have counted to base 60, though perhaps only a few of them did much counting at all. Base 10 for logarithms was chosen for convenience in arithmetic, but it w ...
PHYS 1443 – Section 501 Lecture #1
... Conservation of Linear Momentum in a Two Particle System Consider an isolated system with two particles that does not have any external forces exerting on it. What is the impact of Newton’s 3rd Law? If particle#1 exerts force on particle #2, there must be another force that the particle #2 exerts o ...
... Conservation of Linear Momentum in a Two Particle System Consider an isolated system with two particles that does not have any external forces exerting on it. What is the impact of Newton’s 3rd Law? If particle#1 exerts force on particle #2, there must be another force that the particle #2 exerts o ...
Renormalization group
In theoretical physics, the renormalization group (RG) refers to a mathematical apparatus that allows systematic investigation of the changes of a physical system as viewed at different distance scales. In particle physics, it reflects the changes in the underlying force laws (codified in a quantum field theory) as the energy scale at which physical processes occur varies, energy/momentum and resolution distance scales being effectively conjugate under the uncertainty principle (cf. Compton wavelength).A change in scale is called a ""scale transformation"". The renormalization group is intimately related to ""scale invariance"" and ""conformal invariance"", symmetries in which a system appears the same at all scales (so-called self-similarity). (However, note that scale transformations are included in conformal transformations, in general: the latter including additional symmetry generators associated with special conformal transformations.)As the scale varies, it is as if one is changing the magnifying power of a notional microscope viewing the system. In so-called renormalizable theories, the system at one scale will generally be seen to consist of self-similar copies of itself when viewed at a smaller scale, with different parameters describing the components of the system. The components, or fundamental variables, may relate to atoms, elementary particles, atomic spins, etc. The parameters of the theory typically describe the interactions of the components. These may be variable ""couplings"" which measure the strength of various forces, or mass parameters themselves. The components themselves may appear to be composed of more of the self-same components as one goes to shorter distances.For example, in quantum electrodynamics (QED), an electron appears to be composed of electrons, positrons (anti-electrons) and photons, as one views it at higher resolution, at very short distances. The electron at such short distances has a slightly different electric charge than does the ""dressed electron"" seen at large distances, and this change, or ""running,"" in the value of the electric charge is determined by the renormalization group equation.