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Grishchuk, L. V.

doi:10.1023/a:1023966827299

Cited by 9 publications

(13 citation statements)

References 2 publications

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“…The stochastic background of GWs is assumed to be isotropic [30][31][32] and must exist at present as a result of an amplification of vacuum fluctuations of gravitational field to other mechanisms that can take place during or after inflation [33]. Inflationary processes and the hypothetical cosmic strings are potential candidates of the GW background with some differences in the predicted intensity and spectral features [30][31][32].…”

Section: Overview Of High Frequency Gw Sources and Detection Amplmentioning

confidence: 99%

Upper limits on the amplitude of ultra-high-frequency gravitational waves from graviton to photon conversion

Ejlli

Cruise

et al. 2019

Eur. Phys. J. C

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In this work, we present the first experimental upper limits on the presence of stochastic ultrahigh-frequency gravitational waves. We exclude gravitational waves in the frequency bands from (2.7−14)×10 14 Hz and (5−12)×10 18 Hz down to a characteristic amplitude of h min c ≈ 6×10 −26 and h min c ≈ 5 × 10 −28 at 95% confidence level, respectively. To obtain these results, we used data from existing facilities that have been constructed and operated with the aim of detecting WISPs (Weakly Interacting Slim Particles), pointing out that these facilities are also sensitive to gravitational waves by graviton to photon conversion in the presence of a magnetic field. The principle applies to all experiments of this kind, with prospects of constraining (or detecting), for example, gravitational waves from light primordial black hole evaporation in the early universe.

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Section: Overview Of High Frequency Gw Sources and Detection Amplmentioning

confidence: 99%

Upper limits on the amplitude of ultra-high-frequency gravitational waves from graviton to photon conversion

Ejlli

Cruise

et al. 2019

Eur. Phys. J. C

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“…In fact, the EM perturbation effects produced by the HFGWs and their detections had been discussed. These EM detection systems include constructed and proposed ones like the two coupled spherical cavities [46], high-frequency phonon trapping acoustic cavities [47], closed cylindrical superconducting cavity [48] and coupling system between the planar superconducting open cavity and static magnetic field [49]. However, in this previous research, the HFGWs interacting with such EM systems are almost restricted to GWs in the GR framework, i.e., they satisfy the TT-gauge condition.…”

Section: (): V-volmentioning

confidence: 99%

“…In this case from Eqs. (20), (45) and (48), in the same way, under the resonance condition (ω e = ω g ), the transverse PPFs can be given by…”

Section: And Onlŷ E (0)mentioning

confidence: 99%

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Electromagnetic response to high-frequency gravitational waves having additional polarization states: distinguishing and probing tensor-mode, vector-mode and scalar-mode gravitons

Wen

Fang

et al. 2020

Eur. Phys. J. C

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Gravitational waves (GWs) from extra dimensions, very early universe, and some high-energy astrophysical processes might have at most six polarization states: tensor- and nontensor-mode gravitons. The peak regions or partial peak regions (of the amplitudes or energy densities) of some of such GWs are just distributed in the GHz or higher frequency band, which would be an optimal frequency band for the electromagnetic (EM) response to such high-frequency GWs (HFGWs). In this paper we investigate the EM response to the HFGWs, and for the first time we obtain the concrete form of analytic solutions of the perturbative EM fields caused by all six possible polarizations of the HFGWs in the background stable EM fields and in the proposed three dimensional synchro-resonance system (3DSR system), respectively. It is found that all such six polarizations may in principle show separability and detectability. Moreover, the detection frequency band ($$\sim 10^{8}$$ ∼ 10 8 to $$10^{12}$$ 10 12 Hz or higher) of the signal photon fluxes by the 3DSR system and the observation frequency range ($$\sim 7\times 10^{7}$$ ∼ 7 × 10 7 to $$3\times 10^{9}$$ 3 × 10 9 Hz) of the signals by the FAST (Five-hundred-meter Aperture Spherical Telescope, China) have a certain overlapping property, and thus their coincidence experiments in the future for observations will have high complementarity.

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“…As mentioned in the introduction, the cross spectrum C TE l can be useful in revealing the presence of RGWs in the zero-multipole method [32,33,41,42,60]. The 5-year WMAP [7,8] has given the observed C TE l , which is negative (anticorrelation) in a range l ' ð50; 220Þ.…”

Section: A the Nfsmentioning

confidence: 99%

Analytic spectra of CMB anisotropies and polarization generated by relic gravitational waves with modification due to neutrino free-streaming

Xia

Zhang

2008

Phys. Rev. D

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We present an analytical calculation of the spectra of CMB anisotropies and polarizations generated by relic gravitational waves (RGWs). As a substantial extension to the previous studies, three new ingredients are included in this work. First, the analytic C TT l and C TE l are given; especially the latter can be useful to extract signal of RGWs from the observed data in the zero-multipole method. Second, a fitting formula of the decaying factor on small scales is given, coming from the visibility function around the photon decoupling. Third, the impacts by the neutrino free-streaming (NFS) is examined, a process that occurred in the early universe and leaves observable imprints on CMB via RGWs. It is found that the analytic C TT l and C TE l have profiles agreeing with the numeric ones, except that C TT l in a range l 10 and the first trough of C TE l around l $ 75 have some deviations. With the new damping factor, the analytic C EE l and C BB l match with the numeric ones with the maximum errors only $3% up to the first three peaks for l 600, improving the previous studies substantially. The correspondence of the positions of peaks of C XX l and those of RGWs are also demonstrated explicitly. We also find that NFS reduces the amplitudes of C XX l by ð20% $ 35%Þ for l ' ð100 $ 600Þ and shifts slightly their peaks to smaller angles. Detailed analyses show that the zero multipoles l 0 , where C TE l crosses 0, are shifted to larger values by NFS. This shifting effect is as important as those caused by different inflation models and different baryon fractions.

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Cited by 9 publications

References 2 publications

Upper limits on the amplitude of ultra-high-frequency gravitational waves from graviton to photon conversion

Upper limits on the amplitude of ultra-high-frequency gravitational waves from graviton to photon conversion

Electromagnetic response to high-frequency gravitational waves having additional polarization states: distinguishing and probing tensor-mode, vector-mode and scalar-mode gravitons

Analytic spectra of CMB anisotropies and polarization generated by relic gravitational waves with modification due to neutrino free-streaming

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