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

2020 ◽  
Vol 80 (9) ◽  
Author(s):  
Fang-Yu Li ◽  
Hao Wen ◽  
Zhen-Yun Fang ◽  
Di Li ◽  
Tong-Jie Zhang
Keyword(s):  
Gravitational Waves ◽  
Frequency Band ◽  
High Frequency ◽  
Three Dimensional ◽  
High Energy ◽  
Analytic Solutions ◽  
Electromagnetic Response ◽  
Detection Frequency ◽  
Signal Photon ◽  
Polarization States

AbstractGravitational 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.

Comparative Feature Analysis of Ground Surface Vibration Induced by High-Speed Train Running on Viaduct and Embankment

2014 ◽  
Vol 638-640 ◽  
pp. 1229-1232
Author(s):  
Kun Ming Mao ◽  
Ting Ting Wang ◽  
Qian Wen Ru ◽  
Yan Li
Keyword(s):  
Frequency Band ◽  
High Frequency ◽  
High Speed ◽  
Fourier Spectrum ◽  
Three Dimensional ◽  
Low Frequency ◽  
Ground Surface ◽  
Vertical Acceleration ◽  
High Frequency Band ◽  
Surface Vibration

Based on the Abaqus parallel computing cluster system platform, the three-dimensional finite element model of train-track-viaduct/embankment-foundation-soil coupling is established. The three-dimensional space-time variation and Fourier spectrums characters of ground surface vibration vertical accelerations by high-speed train running on viaduct and embankment are simulated. The result shows that ground surface vibration is mainly excited by periodic axle force of the train in the site near the viaduct pier. In the site far from the viaduct pier, ground surface vibration is mainly from the transmission of the site near the viaduct pier. With the increased distance between the viaduct pier, the peak value of ground surface vibration vertical acceleration decreases, and decreases significantly when the distance is within 10m. There are two main frequency bands of Fourier spectrum of ground surface vibration vertical acceleration: low-frequency band 0-12Hz and high-frequency band 35-47Hz of viaduct route, and low-frequency band 0-21Hz and high-frequency band 25-45Hz of embankment route. In general, with the increased distance between viaduct/embankment, Fourier spectrum amplitude of every frequency band decrease, and attenuation speed of high-frequency band is much faster than-frequency band’s.

ELECTROMAGNETIC DETECTION OF HIGH-FREQUENCY GRAVITATIONAL WAVES

2002 ◽  
Vol 11 (07) ◽  
pp. 1049-1059 ◽  
Author(s):  
FANG-YU LI ◽  
MENG-XI TANG
Keyword(s):  
Gravitational Waves ◽  
High Frequency ◽  
High Energy ◽  
High Energy Particle ◽  
Energy Particle ◽  
Particle Beams ◽  
Detection Systems ◽  
Extremely High Frequency ◽  
Electromagnetic Detection ◽  
Inflationary Models

Unlike usual astrophysical sources of gravitational wave (GW), strong electromagnetic (EM) oscillation systems, high-energy particle beams, solar plasma and crystal arrays are able to produce GWs of extremely high-frequency. Their frequencies may reach up to 108 Hz or higher, but the corresponding amplitude orders are only 10-33 - 10-40. We review the possibility of EM detection for the above GWs. In addition, the maximal signal of high-frequency relic GWs, recently expected by quintessential inflationary models, may be firmly localized in the GHz region. We estimate perturbative effects of the relic GWs to the EM detection systems, and show that the effects can possibly provide a new scheme for the EM detection of the relic GW in the GHz window.

scholarly journals GRAVITATIONAL WAVES, DARK ENERGY AND INFLATION

2010 ◽  
Vol 25 (11n12) ◽  
pp. 922-935 ◽  
Author(s):  
WEI-TOU NI
Keyword(s):  
Dark Energy ◽  
Gravitational Wave ◽  
Gravitational Waves ◽  
Frequency Band ◽  
High Frequency ◽  
Low Frequency ◽  
Big Bang ◽  
Complete Classification ◽  
High Frequency Band ◽  
Very High Frequency

In this paper we first present a complete classification of gravitational waves according to their frequencies: (i) Ultra high frequency band (above 1 THz); (ii) Very high frequency band (100 kHz–1 THz); (iii) High frequency band (10 Hz–100 kHz); (iv) Middle frequency band (0.1 Hz–10 Hz); (v) Low frequency band (100 nHz–0.1 Hz); (vi) Very low frequency band (300 pHz–100 nHz); (vii) Ultra low frequency band (10 fHz–300 pHz); (viii) Hubble (extremely low) frequency band (1 aHz–10 fHz); (ix) Infra-Hubble frequency band (below 1 aHz). After briefly discussing the method of detection for different frequency bands, we review the concept and status of space gravitational-wave missions — LISA, ASTROD, ASTROD-GW, Super-ASTROD, DECIGO and Big Bang Observer. We then address to the determination of dark energy equation, and probing the inflationary physics using space gravitational wave detectors.

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