Generation of Ultrashort Light Pulses by Means of Lasers

Zel'dovich, Boris Ya; Kuznetsova, T. I.

doi:10.1070/pu1972v015n01abeh004943

Cited by 41 publications

(24 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It might be tempting to interpret the viscosity mediated kind of tidal friction in material bodies as an electromagnetic mediated kind of interaction, on the grounds that viscosity is an electromagnetic process. It seems to us, however, that the electromagnetic tidal friction is of the type discussed in Zel'dovich [5,6], and Richartz & Saa [8], in which the electromagnetic field actually mediates between the two bodies, and in which one can think of the effect as electromagnetic superradiance. Accordingly one should think of the black hole and the hypercompact ultraviscous star as fully equivalent systems.…”

Section: Concluding Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Superradiance-tidal friction correspondence

2014

View full text Add to dashboard Cite

Since the work of Hartle in the 1970s, and the subsequent development of the the Membrane Paradigm approach to black hole physics it has been widely accepted that superradiant scattering of gravitational waves bears strong similarities with the phenomenon of "tidal friction" (well-known from Newtonian gravity) operating in binary systems of viscous material bodies. In this paper we revisit the superradiance-tidal friction analogy within the context of ultracompact relativistic bodies. We advocate that as long as these bodies have non-zero viscosity they should undergo tidal friction that can be construed as a kind of superradiant scattering from the point of view of the dynamics of an orbiting test-body. In addition we consider the presence of anisotropic matter, which is required for at least some ultracompact bodies, if they are to sustain a radius very close to the gravitational radius. We find that the tidal friction/superradiance output is enhanced with increasing anisotropy and that strongly anisotropic systems exhibit an unconventional response to tidal and centrifugal forces. Finally, we make contact with the artificial system comprising a black hole with its horizon replaced by a mirror (sometimes used as a proxy for ultracompact material bodies) and discuss superradiance and tidal friction in relation to it.

show abstract

Section: Concluding Discussionmentioning

confidence: 99%

“…Although superradiance is today associated with rotating black holes, and therefore with both the presence of an event horizon and an ergoregion, in fact it requires neither. The phenomenon was first discussed by Zel'dovich in the context of electromagnetic waves scattering off a non-relativistic cylinder [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Superradiance-tidal friction correspondence

2014

View full text Add to dashboard Cite

show abstract

“…In a Kerr-Newman geometry, the occurrence of pair production has been predicted with the classical example of superradiance by Zel'dovich [401] and has been confirmed for massless fields by Starobinsky [362]. The formulation of this problem in the framework of second-quantized massless field (spin 0 and spin 1/2) has been given in Unruh [378].…”

Section: Vacuum Polarization Around a Black Hole With Electromagneticmentioning

confidence: 99%

The Blackholic energy and the canonical Gamma-Ray Burst

Ruffini¹,

Bernardini²,

Bianco³

et al. 2007

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract. Gamma-Ray Bursts (GRBs) represent very likely "the" most extensive computational, theoretical and observational effort ever carried out successfully in physics and astrophysics. The extensive campaign of observation from space based X-ray and γ-ray observatory, such as the Vela, CGRO, BeppoSAX, HETE-II, INTEGRAL, Swift, R-XTE, Chandra, XMM satellites, have been matched by complementary observations in the radio wavelength (e.g. by the VLA) and in the optical band (e.g. by VLT, Keck, ROSAT). The net result is unprecedented accuracy in the received data allowing the determination of the energetics, the time variability and the spectral properties of these GRB sources. The very fortunate situation occurs that these data can be confronted with a mature theoretical development. Theoretical interpretation of the above data allows progress in three different frontiers of knowledge: a) the ultrarelativistic regimes of a macroscopic source moving at Lorentz gamma factors up to ∼ 400; b) the occurrence of vacuum polarization process verifying some of the yet untested regimes of ultrarelativistic quantum field theories; and c) the first evidence for extracting, during the process of gravitational collapse leading to the formation of a black hole, amounts of energies up to 10 55 ergs of blackholic energy -a new form of energy in physics and astrophysics. We outline how this progress leads to the confirmation of three interpretation paradigms for GRBs proposed in July 2001. Thanks mainly to the observations by Swift and the optical observations by VLT, the outcome of this analysis points to the existence of a "canonical" GRB, originating from a variety of different initial astrophysical scenarios. The communality of these GRBs appears to be that they all are emitted in the process of formation of a black hole with a negligible value of its angular momentum. The following sequence of events appears to be canonical: the vacuum polarization process in the dyadosphere with the creation of the optically thick self accelerating electron-positron plasma; the engulfment of baryonic mass during the plasma expansion; adiabatic expansion of the optically thick "fireshell" of electronpositron-baryon plasma up to the transparency; the interaction of the accelerated baryonic matter with the interstellar medium (ISM). This leads to the canonical GRB composed of a proper GRB (P-GRB), emitted at the moment of transparency, followed by an extended afterglow. The sole parameters in this scenario are the total energy of the dyadosphere E dya , the fireshell baryon loading M B defined by the dimensionless parameter B ≡ M B c 2 /E dya , and the ISM filamentary distribution around the source. In the limit B → 0 the total energy is radiated in the P-GRB with a vanishing contribution in the afterglow. In this limit, the canonical GRBs explain as well the short GRBs. In these lecture notes we systematically outline the main results of our model comparing and contrasting them with the ones in the current literature. In both cases, we have li...

show abstract

“…wave scattering in a Kerr black hole spacetime), low-frequency incident waves can be amplified in the scattering process. This amplification effect, known as superradiance, was first discovered by Zel'dovich in the context of electromagnetic waves [24], and later shown to be a more general phenomenon in physics [18,19], in which classical as well as quantum field excitations can be amplified.…”

Section: Introductionmentioning

confidence: 93%

Super-radiant scattering of dispersive fields

Richartz

Prain

Weinfurtner

et al. 2013

Class. Quantum Grav.

View full text Add to dashboard Cite

Motivated by analogue models of classical and quantum field theory in curved spacetimes and their recent experimental realizations, we consider wave scattering processes of dispersive fields exhibiting two extra scattering channels. In particular, we investigate how standard superradiant scattering processes are affected by subluminal or superluminal modifications of the dispersion relation. We analyze simple 1+1dimensional toy-models based on fourth-order corrections to the standard second order wave equation and show that low-frequency waves impinging on generic scattering potentials can be amplified during the process. In specific cases, by assuming a simple step potential, we determine quantitatively the deviations in the amplification spectrum that arise due to dispersion, and demonstrate that the amplification can be further enhanced due to the presence of extra scattering channels. We also consider dispersive scattering processes in which the medium where the scattering takes place is moving with respect to the observer and show that superradiance can also be manifest in such situations.

show abstract

Generation of Ultrashort Light Pulses by Means of Lasers

Cited by 41 publications

References 8 publications

Superradiance-tidal friction correspondence

Superradiance-tidal friction correspondence

The Blackholic energy and the canonical Gamma-Ray Burst

Super-radiant scattering of dispersive fields

Contact Info

Product

Resources

About