Testing quantum mechanics in non-Minkowski space-time with high power lasers and 4th generation light sources

Crowley, B.J.B.; Bingham, R.; Evans, R. G.; Gericke, Dirk O.; Landen, O. L.; Murphy, Christopher; Norreys, P. A.; Rose, S. J.; Tschentscher, Th.; Wang, Chuangnan; Wark, J. S.; Gregori, G.

doi:10.1038/srep00491

Cited by 13 publications

(21 citation statements)

References 30 publications

(34 reference statements)

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“…The general agreement between the classical emission rate and quantum spontaneous emission rate of electromagnetic (EM) dipole radiations have been well-known at atomic scales (see e.g., [1]). Such an agreement is also clear in the classical cyclotron radiation and the quantum spontaneous emission of the Landau levels [2], in the context of detecting Unruh radiation as a quantum vacuum effect in non-inertial frames [3].…”

Section: Introductionmentioning

confidence: 65%

Bremsstrahlung of Light through Spontaneous Emission of Gravitational Waves

Wang

Mieczkowska

2021

Symmetry

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Zero-point fluctuations are a universal consequence of quantum theory. Vacuum fluctuations of electromagnetic field have provided crucial evidence and guidance for QED as a successful quantum field theory with a defining gauge symmetry through the Lamb shift, Casimir effect, and spontaneous emission. In an accelerated frame, the thermalisation of the zero-point electromagnetic field gives rise to the Unruh effect linked to the Hawking effect of a black hole via the equivalence principle. This principle is the basis of general covariance, the symmetry of general relativity as the classical theory of gravity. If quantum gravity exists, the quantum vacuum fluctuations of the gravitational field should also lead to the quantum decoherence and dissertation of general forms of energy and matter. Here we present a novel theoretical effect involving the spontaneous emission of soft gravitons by photons as they bend around a heavy mass and discuss its observational prospects. Our analytic and numerical investigations suggest that the gravitational bending of starlight predicted by classical general relativity should also be accompanied by the emission of gravitational waves. This in turn redshifts the light causing a loss of its energy somewhat analogous to the bremsstrahlung of electrons by a heavier charged particle. It is suggested that this new effect may be important for a combined astronomical source of intense gravity and high-frequency radiation such as X-ray binaries and that the proposed LISA mission may be potentially sensitive to the resulting sub-Hz stochastic gravitational waves.

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Section: Introductionmentioning

confidence: 65%

Bremsstrahlung of Light through Spontaneous Emission of Gravitational Waves

Wang

Mieczkowska

2021

Symmetry

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“…which is given at an arbitrary time t = 0, where ρ (r) is the particle density operator and the electromagnetic vector potential operator at is represented by the modal expansion [15] A…”

Section: Thomson Scattering By a System Of Many Electronsmentioning

confidence: 99%

“…We choose to give (16) in the 'time-symmetric' form [15], which is generalizable to nonequilibrium systems (see the appendix) rather than in the more usual time-asymmetric form, (A.36), to which it is entirely equivalent for systems in equilibrium.…”

Section: Thomson Scattering By a System Of Many Electronsmentioning

confidence: 99%

X-ray scattering by many-particle systems

Crowley

Gregori

2013

New J. Phys.

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This paper reviews the treatment of high-frequency Thomson scattering in the non-relativistic and near-relativistic regimes with the primary purpose of understanding the nature of the frequency redistribution correction to the differential cross-section. This correction is generally represented by a factor involving the ratio ω α /ω β of the scattered (α) to primary (β) frequencies of the radiation. In some formulae given in the literature, the ratio appears squared, in others it does not. In Compton scattering, the frequency change is generally understood to be due to the recoil of the particle as a result of energy and momentum conservation in the photon-electron system. In this case, the Klein-Nishina formula gives the redistribution factor as ω α /ω β 2 . In the case of scattering by a many-particle system, however, the frequency and momentum changes are no longer directly interdependent but depend also upon the properties of the medium, which are encoded in the dynamic structure factor. We show that the redistribution factor explicit in the quantum cross-section (that seen by a photon) is ω α /ω β , which is not squared. Formulae for the many-body cross-section given in the literature, in which the factor is squared, can often be attributed to a different (classical) definition of the cross-section, though not all authors are explicit about which definition they are using. What is shown not to be true is that the structure factor simply gives the ratio of the many-electron to one-electron differential cross-sections, as is sometimes supposed. Mixing up the cross-section definitions can lead to errors when describing x-ray scattering. We illustrate the nature of the discrepancy by deriving the energy-integrated angular

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“…A related effect exists for nonlinear uniform accelerations [8], including circular motion [9,10,11,12], and the circular motion version is related to the spin depolarisation of particle beams in accelerator storage rings [13,14,15,16], originally predicted by different methods [17,18] and observed [19], but also here establishing a direct connection between the observation and the circular motion Unruh effect has remained elusive [16]. The prospects to observe versions of the Unruh effect with highpower laser systems are discussed in [20,21,22,23]. An experimental confirmation of the Unruh effect would be significant since the mathematics underpinning the effect is closely related to the mathematics in Hawking's prediction of black hole radiation [24] and to the mathematics of the early universe quantum effects that may be responsible for the origin of structure in the present-day Universe [25,26].…”

Section: Introductionmentioning

confidence: 99%

Thermality from a Rindler quench

Louko¹

2018

Class. Quantum Grav.

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Ultracold fermionic atoms in an optical lattice, with a sudden position-dependent change (a quench) in the effective dispersion relation, have been proposed by Rodríguez-Laguna et al. as an analogue spacetime test of the Unruh effect. We provide new support for this analogue by analysing a massless scalar field on a (1 + 1)-dimensional continuum spacetime with a similar quench: an early time Minkowski region is joined at a constant time surface, representing the quench, to a late time static region in which left and right asymptotically Rindler domains are connected by a smooth negative curvature bridge. We show that the quench is energetically mild, and late time static observers, modelled as a derivative-coupling Unruh-DeWitt detector, see thermality, in a temperature that equals the Unruh temperature for observers in the asymptotic Rindler domains. The Unruh effect hence prevails, despite the energy injected into the field by the quench and despite the absence of a late time Killing horizon. These results strengthen the motivation to realise the experimental proposal.

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Testing quantum mechanics in non-Minkowski space-time with high power lasers and 4th generation light sources

Cited by 13 publications

References 30 publications

Bremsstrahlung of Light through Spontaneous Emission of Gravitational Waves

Bremsstrahlung of Light through Spontaneous Emission of Gravitational Waves

X-ray scattering by many-particle systems

Thermality from a Rindler quench

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