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1.
Considering the unfixed background space-time and self-gravitational interaction, we review the Hawking radiation of the Kerr–Newman
black hole by Hamilton–Jacobi method. The result shows the tunneling probability is related to the change of Bekenstein–Hawking
entropy and the radiation spectrum deviates from the precisely thermal one, which is in accordance with Parikh and Wilczek’s
result and gives another method to study the Hawking radiation of the black hole. 相似文献
2.
After taking into account energy conservation and the particle’s self-gravitation interaction, Hawking radiation of the massive
particle as tunneling from Schwarzshild-anti-de Sitter black hole is studied by using Parikh-Wilczek’s semi-classical quantum
tunneling approach. Meanwhile, Hawking radiation as tunneling from the black hole is reexamined by developing Angheben–Nadalini–Vanzo–Zerbini
(ANVZ) covariant method to cover energy conservation and the particle’s self-gravitation interaction. Both the results perfectly
generalize those obtained by Parikh and Wilczek, and show that the tunneling rate is related to the change of Bekenstein-Hawking
entropy, and the factual emission spectrum is not exactly thermal, but satisfies the underlying unitary theory.
PACS: 04.70-s, 9760. Lf. 相似文献
3.
It is shown that the macroscopic transverse dimensions of the target can strongly influence the spectrum of transition radiation
emitted by relativistic electrons in thin layers of matter and that the effect is extremely important in experiments on coherent
transition radiation in the infrared.
Pis’ma Zh. éksp. Teor. Fiz. 65, No. 8, 581–584 (25 April 1997) 相似文献
4.
The formation of radiating particles in the excitation of C60 fullerene molecules by electrons with energies E
e<100 eV is investigated by the method of crossed molecular and electron beams. A quasicontinuous (with a spectral resolution
of 3 nm) emission spectrum, close to the Planck emission spectrum of a heated body, is recorded in the wavelength range 300–800
nm. The temperature of the radiation corresponds to an internal energy of the C60 molecule of approximately 40 eV.
Pis’ma Zh. éksp. Teor. Fiz. 63, No. 12, 915–919 (25 June 1996) 相似文献
5.
The α decay of the anomalously low-lying isomeric level 3/2+ (3.5±1.0 eV) of the 229Th nucleus is studied. The lifetime of the isomer with respect to a decay is predicted and the spectrum of the emitted a particles
is calculated. It is noted that the complete α spectrum of the isomer and accelerated α decay of 229Th can be observed by exciting the nuclei with laser radiation.
Pis’ma Zh. éksp. Teor. Fiz. 64, No. 5, 319–323 (10 September 1996) 相似文献
6.
The possible use of a simplified UV absorption spectroscopic method for dosimetry of bioactive antirachitic UV radiation has
been analyzed. The method is based on the observation of the phototransformation kinetics of the provitamin D3 primary molecule in ethanol (in vitro vitamin D3 synthesis model) by measuring the decrease in the optical density at a fixed wavelength during UV exposure. The method can
be used successfully for artificial UV sources with a constant radiation spectrum. However, such a technique turns out to
be inapplicable to solar UV dosimetry in view of the variability of the solar UV spectrum that results in a varying rate of
formation of irreversible photoproducts.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 76, No. 2, pp. 256–260, March–April, 2009. 相似文献
7.
In the context of gravity’s rainbow, Planck scale correction on Hawking radiation and black hole entropy in Parikh and Wilczk’s
tunneling framework is studied. We calculate the tunneling probability of massless particles in the modified Schwarzschild
black holes from gravity’s rainbow. In the tunneling process, when a particle gets across the horizon, the metric fluctuation
must be taken into account, not only due to energy conservation but also to spacetime Planck scale effect. Our results show
that the emission rate is related to changes of the black hole’s quantum corrected entropies before and after the emission.
In the same time, for the modified black holes, a series of correction terms including a logarithmic term to Bekenstein–Hawking
entropy are obtained. Correspondingly, the spectrum of Planck scale corrected emission is obtained and it deviates from the
thermal spectrum. In addition, a specific form of modified dispersion relation is proposed and applied. 相似文献
8.
A. P. Nickolaenko 《Radiophysics and Quantum Electronics》2010,53(4):215-224
We simulate an electromagnetic pulse excited by a sharp descent of the charged upper wall of the Earth–ionosphere cavity.
The ionosphere descent by 20 km was detected over the dayside Earth’s hemisphere during a giant extragalactic gamma-ray burst
in the constellation of Sagittarius (SGR 1806–20). We show that a sharp change in the ionosphere altitude can cause a discrete
pulse of extremely low-frequency radiation with the spectrum having some specific features and the amplitude significantly
exceeding the natural regular noise background. The time of arrival of the radio pulse to an observer coincides with the gamma-burst
time. 相似文献
9.
The differential energy spectrum of cosmic rays that is obtained on the basis of the measurements of Cherenkov radiation from
extensive air showers in an energy range of 1015–1020 eV is compared with the model of the propagation of primary particles in the interstellar medium with fractal properties.
It is found that the shape of the experimental spectrum is in good agreement with the shape of the calculated spectrum of
“all particles” at 1015–1018 eV. The average mass composition of cosmic rays that is calculated on the basis of five components does not contradict the
average mass composition obtained from the experimental data for several parameters in this energy range.
Original Russian Text ? S.P. Knurenko, A.A. Ivanov, A.V. Saburov, 2007, published in Pis’ma v Zhurnal éksperimental’noĭ i
Teoreticheskoĭ Fiziki, 2007, Vol. 86, No. 10, pp. 709–712. 相似文献
10.
Kerner and Mann’s recent research shows that the Hawking temperature and tunneling rate can be obtained by the fermion tunneling
method from the Rindler space-time and a general non-rotating black hole. In this paper, considering the tunneling particles
with spin 1/2 and taking into account the particle’s self-gravitation in the dynamical background space-time, we further improve
Kerner and Man’s fermion tunneling method to investigate Hawking radiation via tunneling from a non-static black hole with
the internal global monopole. The result shows that the tunneling rate of the non-static black hole is related to the integral
of the changing horizon besides the change of Bekenstein–Hawking entropy, which is different from the stationary cases. It
also essentially implies that the unitary is violated for the reason that the black hole is non-stationary and cannot be treated
as an isolated system. 相似文献
11.
The boundary problem of nonlinear optics was investigated for a trial wave reflected (refracted) by an excited region of a
nonlinear medium considered as a system of multilevel atoms in the spectrum of which there are two closely-spaced energy levels
excited by a powerful quasi-resonant radiation. It is shown that under interference conditions of the atomic states in the
field of the trial and resonance waves there exist three types of waves: an inverse wave and two polarization waves. By way
of extension of the Ewald-Oseen procedure to this case a formula for the complex refractive index of a nonlinear medium for
the three types of waves as well as a generalized extinction theorem have been obtained. It is shown that the trial wave can
be amplified without inversion of the interfering atomic states and that the refractive index can be markedly changed at certain
concentrations of atoms in the medium. General formulas for the amplitudes of the reflected and refracted waves have been
obtained.
Ul’yanovsk State University, 42, Tolstoi Str., Ul’yanovsk, 432700, Russia. Translated from Zhurnal Prikladnoi Spektroskopii,
Vol. 65, No. 4, pp. 568–575, July–August, 1998. 相似文献
12.
The radiation from relativistic particles channeled in a microscopic undulator created by applying transverse ultrasonic vibrations
to a single crystal is investigated. The results of numerical investigations are presented for real crystal undulators. The
calculations show the radiation spectra in the particle and photon energy ranges where narrowing of the spectrum occurs when
the particle energy is close to a definite threshold energy.
Pis’ma Zh. éksp. Teor. Fiz. 68, No. 6, 437–441 (25 September 1998) 相似文献
13.
Xian-Ming Liu Su-Jun Cheng Wen-Biao Liu 《International Journal of Theoretical Physics》2012,51(2):518-525
Under the extended dynamical tortoise coordinate transformation, Damour-Ruffini method has been applied to calculate the charged
particles’ Hawking radiation from the apparent horizon of a dynamical Kerr-Newman black hole. It is shown that Hawking radiation
is still purely thermal black body spectrum. Moreover, the temperature of Hawking radiation is corresponding to the apparent
horizon surface gravity and the first law of thermodynamics can also be constructed successfully on the apparent horizon in
the dynamical Kerr-Newman black hole. 相似文献
14.
Applying the Hamilton–Jacobi method, we investigate the Hawking radiation as tunneling from the non-stationary Vaidya–Bonner
black hole by considering the unfixed background space-time and self-gravitational interaction. The result shows the actual
radiation spectrum deviates from the purely thermal one and the tunneling rate is related not only to the change of Bekenstein–Hawking
entropy but also to the integral to the black hole mass and charge. This implies information loss is possible. 相似文献
15.
R. Coisson P.V. Hôi P. Podini B. Huy V.D. Thinh 《Applied physics. B, Lasers and optics》2000,71(6):905-907
‘Low-coherence interferometry’ is an old technique which has had a wide development recently, and is based on the fact that
interference with a path difference much longer that the coherence length gives rise to a ‘channeled spectrum’, which can
be detected either by a dispersive spectroscope or by a second interferometer with a variable delay. We have tested an alternative
way to detect path differences in this kind of interferometry, by analyzing the output intensity fluctuation correlations
by a radiofrequency spectrum analyzer, and Fourier transforming the data. This method is suitable for very long path differences.
The experiments have been performed with different lengths of single-mode fibre, in Mach–Zehnder and Fabry–Pérot configurations.
Received: 30 March 2000 / Revised version: 17 Juli 2000 / Published online: 20 September 2000 相似文献
16.
The entropy spectrum of a spherically symmetric black hole was derived via the Bohr–Sommerfeld quantization rule in Majhi and Vagenas’s work. Extending this work to charged and rotating black holes, we quantize the horizon area and the entropy of an Einstein–Maxwell–Dilaton–Axion black hole via the Bohr–Sommerfeld quantization rule and the adiabatic invariance. The result shows the area spectrum and the entropy spectrum are respectively equally spaced and independent on the parameters of the black hole. 相似文献
17.
E. V. Derishev V. V. Kocharovsky Vl. V. Kocharovsky 《Radiophysics and Quantum Electronics》1997,40(1-2):93-102
The spectral evolution of the soft (≲1 MeV) gamma-ray radiation of neutron stars in a strong magnetic field (B ≳ 6·1012 G) is analyzed. It is shown that the radiation transfer equation for the photon splitting cascade has a one-parameter set
of self-similar solutions whose integral expansion is an efficient method for study of the general solution. An arbitrary
initial spectrum converges quickly to a self-similar solution provided that most of the radiation energy is concentrated in
the hard spectral range. We consider the possible observational consequences of the photon splitting, including the polarization
and softening of the output spectrum as well as the occurrence of a spectral break and condensation of all hard-energy radiation
near that break.
Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii,
radiofizika, Vol. 40, Nos. 1–2, pp. 146–160, January–February, 1997. 相似文献
18.
The spatial distribution of the electromagnetic field in a two-dimensional photonic crystal with a lattice defect is investigated.
It is shown that in such a structure the field can be localized in a region smaller than one wavelength in size. The dependence
of the spectrum of defect modes on the parameters of a two-dimensional photonic crystal is investigated. The light field at
the exit of the photonic crystal possesses properties of a nonradiative mode, making it possible to achieve spatial resolution
in the near-field much higher than the radiation wavelength. The possibilities of using this phenomenon in optical near-field
microscopy to produce optical memory devices and to increase the efficiency of nonlinear optical interactions are discussed.
Pis’ma Zh. éksp. Teor. Fiz. 70, No. 5, 323–328 (10 September 1999) 相似文献
19.
Yu. K. Zemtsov A. Yu. Sechin A. N. Starostin A. G. Leonov D. I. Chekhov 《JETP Letters》1997,65(11):839-844
The purely thermal infrared emission spectra of a resonance medium (sodium vapor) are investigated experimentally. It is shown
that the emission intensity in the 2–3 μm range at temperatures of 600–1200 K is several orders of magnitude higher than the
intensity obtained from the standard theory of resonance radiation transfer. This phenomenon can be conventionally termed
an “infrared catastrophe.” The form of the recorded spectra and the absolute intensity of the emission in both the infrared
and visible regions of the spectrum are in agreement with the theory developed by Yu. L. Zemtsov and A. M. Starostin, Zh.
éksp. Teor. Fiz. 103, 345 (1993) [JETP 76, 186 (1993)], in which the Boltzmann spectral distribution of the population of the resonance level is proportional to exp(−ħω/T).
Pis’ma Zh. éksp. Teor. Fiz. 65, No. 11, 807–811 (10 June 1997) 相似文献
20.
Galina A. Vergunova Sergey Yu. Gus’kov Vladislav B. Rozanov Olga N. Rozmej 《Journal of Russian Laser Research》2010,31(5):509-518
We investigate theoretically the formation of a plasma in a plane layer of polymer foam (density ρ = 0.002 g/cm3 and thickness 800 μm) under the action of an external source of soft X-ray radiation under the conditions of PHELIX experiments. The incident
flux is assumed to have a Planck’s distribution over the spectrum with T
rad = 20–40 eV. In numerical calculations, the flux of incident X-ray radiation and the spectral constants of the target substance
are varied. The action of an external X-ray radiation source on a low-density foam substance with a density of 2 mg/cm3 causes a plasma to be formed with relatively homogeneous profiles of density and temperature T = 15–35 eV. Absorption of externalradiation energy is distributed in the volume. The plasma temperature increases with increase
in the external energy, and the energy passed through the plasma also increases. The results prove to be sensitive to the
values of optical constants used in numeral simulation. The spectral flux of external radiation passed through the plasma
is chosen as a criterion of correctness of the optical constants used in the calculations. In future experiments using the
PHELIX facility, we plan to investigate the slowing-down of an ion beam in a plasma formed as a result of indirect heating
of low-density polymer triacetate cellulose (TAC) foam with densities ρ = 0.001–0.01 g/cm3 under the action of a pulse of X-ray radiation, into which the laser radiation is preliminarily transformed. 相似文献