From effective actions to actual effects

Gies, Holger

doi:10.1063/1.1374969

Cited by 3 publications

(5 citation statements)

References 13 publications

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“…[21]. Suppose for instance that the particle m b carries spin, then the spin vector satisfies the transversal condition 5) implying that in the non-relativistic regime p → 0 the 4-vector becomes purely spatial, i.e. S µ → (0, S).…”

Section: Kinematical Considerations and The Hclmentioning

confidence: 99%

“…where y := − z (β−1) 2 and we now define the contour to enclose the emergent pole at y = ∞, i.e. Γ LS = S 1 ∞ 5 The internal massless momenta are given by…”

Section: -Loop Amplitude: Triangle Leading Singularitymentioning

confidence: 99%

“…Since the early days of QFT, the use of effective methods to describe the low energy regime of more fundamental theories [1][2][3] has proven extremely successful [4][5][6]. One of the most powerful applications of Effective Field Theories (EFTs) is the case where the high energy completion of the underlying theory is unknown.…”

Section: Introductionmentioning

confidence: 99%

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Holomorphic classical limit for spin effects in gravitational and electromagnetic scattering

Guevara

2019

J. High Energ. Phys.

166

216

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We provide universal expressions for the classical piece of the amplitude given by the graviton/photon exchange between massive particles of arbitrary spin, at both tree and one loop level. In the gravitational case this leads to higher order terms in the post-Newtonian expansion, which have been previously used in the binary inspiral problem. The expressions are obtained in terms of a contour integral that computes the Leading Singularity, which was recently shown to encode the relevant information up to one loop. The classical limit is performed along a holomorphic trajectory in the space of kinematics, such that the leading order is enough to extract arbitrarily high multipole corrections. These multipole interactions are given in terms of a recently proposed representation for massive particles of any spin by Arkani-Hamed et al. This explicitly shows universality of the multipole interactions in the effective potential with respect to the spin of the scattered particles. We perform the explicit match to standard EFT operators for S = 1 2 and S = 1. As a natural byproduct we obtain the classical pieces up to one loop for the bending of light.

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Section: Kinematical Considerations and The Hclmentioning

confidence: 99%

“…where y := − z (β−1) 2 and we now define the contour to enclose the emergent pole at y = ∞, i.e. Γ LS = S 1 ∞ 5 The internal massless momenta are given by…”

Section: -Loop Amplitude: Triangle Leading Singularitymentioning

confidence: 99%

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Holomorphic classical limit for spin effects in gravitational and electromagnetic scattering

Guevara

2019

J. High Energ. Phys.

166

216

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“…Schwinger pair production at nonzero temperature has been considered before [11][12][13][14][15][16][17][18][19][20] without discovering this process 2 or the rate of Eq. 2.…”

Section: T > T Cmentioning

confidence: 99%

Schwinger pair production at nonzero temperatures or in compact directions

Brown

2018

Phys. Rev. D

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Electric fields may decay by quantum tunneling: as calculated by Schwinger, an electronpositron pair may be summoned from the vacuum. In this paper I calculate the pairproduction rate at nonzero temperatures. I find that at high temperatures the decay rate is dominated by a new instanton that involves both thermal fluctuation and quantum tunneling; this decay is exponentially faster than the rate in the literature. I also calculate the decay rate when the electric field wraps a compact circle (at zero temperature). The same new instanton also governs this rate: I find that for small circles decay is dominated by a process that drops the electric field by one unit, but does not produce charged particles.

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“…In the presence of the electric field, the correction to the speed of light due to the nonlinear interaction is [23][24][25][26][27][28][29][30][31][32][33]…”

Section: The Trajectory Equationmentioning

confidence: 99%

Light bending by nonlinear electrodynamics under strong electric and magnetic field

Kim¹,

Lee²

2011

J. Cosmol. Astropart. Phys.

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We calculate the bending angles of light under the strong electric and magnetic fields by a charged black hole and a magnetized neutron star according to the nonlinear electrodynamics of Euler-Heisenberg interaction. The bending angle of light by the electric field of charged black hole is computed from geometric optics and a general formula is derived for light bending valid for any orientation of the magnetic dipole. The astronomical significance of the light bending by magnetic field of a neutron star is discussed.

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From effective actions to actual effects

Cited by 3 publications

References 13 publications

Holomorphic classical limit for spin effects in gravitational and electromagnetic scattering

Holomorphic classical limit for spin effects in gravitational and electromagnetic scattering

Schwinger pair production at nonzero temperatures or in compact directions

Light bending by nonlinear electrodynamics under strong electric and magnetic field

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