| 1. |
- Cetoli, Alberto, 1979-, et al.
(författare)
-
Interaction of gravitational waves with normal and superconducting matter
- 2012
-
Ingår i: Physical Review D. - : American Physical Society. - 1550-7998 .- 1550-2368. ; 85:6, s. 064036-
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- We develop a unified formalism for describing the interaction of gravitational waves with matterthat clearly separates the effects of general relativity from those due to interactions in the matter.This allows one to take into account the microscopic character of the matter, and we derive a generalexpression for the dispersion of gravitational waves in matter in terms of correlation functions forthe matter in flat spacetime. The formalism enables one to derive simply previous results for thedispersion of gravitational waves in astrophysical plasmas. We also consider metals and show that,while simple estimates indicate that contributions of electrons to the stress tensor could be large,screening of the Coulomb interaction reduces these effects considerably. We consider both normaland superconducting metals, and show that in both cases, electrons and ions are locked togetherunder the influence of a gravitational wave with a frequency much less than the plasma frequencyand, consequently, charge separation has little effect on gravitational waves.
|
|
| 2. |
- Dinu, Victor, et al.
(författare)
-
Infrared divergences in plane wave backgrounds
- 2012
-
Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 86:8, s. 085037-
-
Tidskriftsartikel (refereegranskat)abstract
- We show that the emission of soft photons via nonlinear Compton scattering in a pulsed plane wave (laser field) is in general infrared divergent. We give examples of both soft and soft-collinear divergences, and we pay particular attention to the case of crossed fields in both classical and quantum theories.
|
|
| 3. |
- Forsberg, Mats, et al.
(författare)
-
Linear theory of gravitational wave propagation in a magnetized, relativistic Vlasov plasma
- 2010
-
Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 82:12
-
Tidskriftsartikel (refereegranskat)abstract
- We consider propagation of gravitational waves in a magnetized plasma, using the linearized Maxwell-Vlasov equations coupled to Einstein's equations. A set of coupled electromagnetic-gravitational wave equations are derived that can be straightforwardly reduced to a single dispersion relation. We demonstrate that there is a number of different resonance effects that can enhance the influence of the plasma on the gravitational waves.
|
|
| 4. |
- Harvey, Christopher, et al.
(författare)
-
Covariant worldline numerics for charge motion with radiation reaction
- 2011
-
Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 83, s. 076013-
-
Tidskriftsartikel (refereegranskat)abstract
- We develop a numerical formulation to calculate the classical motion of charges in strong electromagnetic fields, such as those occurring in high-intensity laser beams. By reformulating the dynamics in terms of SL(2,C) matrices representing the Lorentz group, our formulation maintains explicit covariance, in particular the mass-shell condition. Considering an electromagnetic plane wave field where the analytic solution is known as a test case, we demonstrate the effectiveness of the method for solving both the Lorentz force and the Landau-Lifshitz equations. The latter, a second order reduction of the Lorentz-Abraham-Dirac equation, describes radiation reaction without the usual pathologies.
|
|
| 5. |
- Harvey, Christopher, et al.
(författare)
-
Symmetry Breaking from Radiation Reaction in Ultra-Intense Laser Fields
- 2011
-
Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 84:11, s. 116005-
-
Tidskriftsartikel (refereegranskat)abstract
- We discuss radiation reaction effects on charges propagating in ultraintense laser fields. Our analysis is based on an analytic solution of the Landau-Lifshitz equation. We suggest quantifying radiation reaction in terms of a symmetry breaking parameter associated with the violation of null translation invariance in the direction opposite to the laser beam. As the Landau-Lifshitz equation is nonlinear, the energy transfer within the pulse is rather sensitive to initial conditions. This is elucidated by comparing colliding and fixed target modes in electron laser collisions.
|
|
| 6. |
- Hebenstreit, Florian, et al.
(författare)
-
Strong field effects in laser pulses : the Wigner formalism
- 2011
-
Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 83:6
-
Tidskriftsartikel (refereegranskat)abstract
- We investigate strong field vacuum effects using a phase space approach based on the Wigner formalism. We calculate the Wigner function in a strong null-field background exactly, using lightfront field theory. The Wigner function exhibits the distinct features of strong field QED: in particular we identify the effective mass in a laser pulse, compare it to the well-known mass shift in a periodic plane wave and identify signals of multi-photon absorption and emission. Finally, we show how to extend our results to descibe vacuum pair production in colliding laser pulses.
|
|
| 7. |
- Heinzl, Thomas, et al.
(författare)
-
Laser intensity effects in noncommutative QED
- 2010
-
Ingår i: Physical review D. - 1550-7998 .- 1550-2368. ; 81:5, s. 051902(R)-5 pages
-
Tidskriftsartikel (refereegranskat)abstract
- We discuss a twofold extension of QED assuming the presence of strong external fields provided by an ultraintense laser and noncommutativity of spacetime. While noncommutative effects leave the electron’s intensity induced mass shift unchanged, photons change significantly in character: they acquire a quasimomentum that is no longer lightlike. We study the consequences of this combined noncommutative strong-field effect for the basic lepton-photon interactions.
|
|
| 8. |
- Ilderton, Anton, et al.
(författare)
-
Scattering in plane-wave backgrounds : infrared effects and pole structure
- 2013
-
Ingår i: Physical Review D. - : American Physical Society. - 1550-7998 .- 1550-2368. ; 87:8
-
Tidskriftsartikel (refereegranskat)abstract
- We consider two aspects of scattering in strong plane-wave backgrounds. First, we show that the infrared divergences in elastic scattering depend on the structure of the background, but can be removed using the usual Bloch-Nordsieck approach. Second, we analyze the infinite series of shifted-mass-shell poles in the particle (Volkov) propagator using lightfront quantization. The complete series of poles is shown to describe a single, on-shell, propagating particle.
|
|
| 9. |
- Penner, A. J., et al.
(författare)
-
Tidal deformations of neutron stars : The role of stratification and elasticity
- 2011
-
Ingår i: Physical Review D. - College Park, MD : American Physical Society. - 1550-7998 .- 1550-2368. ; 84:10, s. 103006-
-
Tidskriftsartikel (refereegranskat)abstract
- We discuss the response of neutron stars to the tidal interaction in a compact binary system, as encoded in the Love number associated with the induced deformation. This problem is of interest for gravitational-wave astronomy as there may be a detectable imprint on the signal from the late stages of binary coalescence. Previous work has focused on simple barotropic neutron star models, providing an understanding of the role of the stellar compactness and overall density profile. We add realism to the discussion by developing the framework required to model stars with varying composition and an elastic crust. These effects are not expected to be significant for the next generation of detectors, but it is nevertheless useful to be able to quantify them. Our results show that (perhaps surprisingly) internal stratification has no impact whatsoever on the Love number. We also show that crust elasticity provides a (predictably) small correction to existing models.
|
|
