Diffraction from Embedded Reflectors in Li-Baker HFGW Detector

Woods, R.C.

doi:10.1016/j.phpro.2012.08.012

Cited by 7 publications

(10 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In conditions in which the gaussian local oscillator beam is parallel to the incoming signal and at right angles to the static magnetic field, an additional beam of electromagnetic waves is generated by the conversion process, travelling at right angles to the incoming beam and the locally generated beam. The technical challenge is then to distinguish this perpendicular beam of, say, 800 photons/second from the locally generated beam at the same frequency and carrying 10 24 photons/second at frequencies of several GHz (Woods 2012). This demands a geometric purity in the Gaussian beam of better than 10 À21 , far beyond the current state of the art.…”

Section: Heterodyne Enhancement Of Magnetic Conversionmentioning

confidence: 99%

Challenges and opportunities of gravitational-wave searches at MHz to GHz frequencies

et al. 2021

View full text Add to dashboard Cite

The first direct measurement of gravitational waves by the LIGO and Virgo collaborations has opened up new avenues to explore our Universe. This white paper outlines the challenges and gains expected in gravitational-wave searches at frequencies above the LIGO/Virgo band, with a particular focus on Ultra High-Frequency Gravitational Waves (UHF-GWs), covering the MHz to GHz range. The absence of known astrophysical sources in this frequency range provides a unique opportunity to discover physics beyond the Standard Model operating both in the early and late Universe, and we highlight some of the most promising gravitational sources. We review several detector concepts that have been proposed to take up this challenge, and compare their expected sensitivity with the signal strength predicted in various models. This report is the summary of the workshop “Challenges and opportunities of high-frequency gravitational wave detection” held at ICTP Trieste, Italy in October 2019, that set up the stage for the recently launched Ultra-High-Frequency Gravitational Wave (UHF-GW) initiative.

show abstract

Section: Heterodyne Enhancement Of Magnetic Conversionmentioning

confidence: 99%

Challenges and opportunities of gravitational-wave searches at MHz to GHz frequencies

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The currently most optimistic future prospects rely on the actual experimental implementation of the theoretical sensitivity of the GB detector, see Sec. 3.2, whose feasibility has, however, been questioned [294]. Furthermore, there are other interesting experimental concepts that have been proposed only very recently and might become the most promising routes forward.…”

Section: Discussionmentioning

confidence: 99%

“…In turn, however, the noise due to the GB photons can be quite large. To mitigate this issue, it was proposed to use reflectors in order to focus the induced electromagnetic wave in the direction of the receivers [213,283,[291][292][293][294]. The sensitivity reported in Ref.…”

Section: Experiments Based On a Gaussian Beammentioning

confidence: 99%

“…It is necessary to emphasize that the feasibility of the experimental apparatus including the reflectors, maintaining the exceptional sensitivity that is reported in the original theoretical papers, has been questioned multiple times and seems extremely difficult to be achieved. Beyond the issues related to diffraction effects caused by the reflectors [294], the original papers do not take into account the noise due to the fact that the laser cannot be exactly linearly polarized in one direction, which would likely dominate the noise budget. 13 More studies to explore the feasibility of such a concept are a necessary step to be taken in the future, in order to assess all the possible noise sources that might deteriorate the sensitivity.…”

Section: Experiments Based On a Gaussian Beammentioning

confidence: 99%

See 1 more Smart Citation

Hunt for Light Primordial Black Hole Dark Matter with Ultra-High-Frequency Gravitational Waves

Franciolini¹,

Maharana²,

Muia³

2022

Preprint

View full text Add to dashboard Cite

Light primordial black holes may comprise a dominant fraction of the dark matter in our Universe. This paper critically assesses whether planned and future gravitational wave detectors in the ultra-high-frequency band could constrain the fraction of dark matter composed of sub-solar primordial black holes. Adopting the state-of-the-art description of primordial black hole merger rates, we compare various signals with currently operating and planned detectors. As already noted in the literature, our findings confirm that detecting individual primordial black hole mergers with currently existing and operating proposals remains difficult. Current proposals involving gravitational wave to electromagnetic wave conversion in a static magnetic field and microwave cavities feature a technology gap with respect to the loudest gravitational wave signals from primordial black holes of various orders of magnitude. However, we point out that one recent proposal involving resonant LC circuits represents the best option in terms of individual merger detection prospects in the range (1 ÷ 100) MHz. In the same frequency range, we note that alternative setups involving resonant cavities, whose concept is currently under development, might represent a promising technology to detect individual merger events. We also show that a detection of the stochastic gravitational wave background produced by unresolved binaries is possible only if the theoretical sensitivity of the proposed Gaussian beam detector is achieved. Such a detector, whose feasibility is subject to various caveats, may be able to rule-out some scenarios for asteroidal mass primordial black hole dark matter. We conclude that pursuing dedicated studies and developments of gravitational wave detectors in the ultra-high-frequency band remains motivated and may lead to novel probes on the existence of light primordial black holes.

show abstract

“…The arguably most promising of these modified magnetic GW-EMW conversion detection proposals exploits a VHF EM GB to induce a first order signal in magnetic GW-EMW conversion [102][103][104][105][106][107][108][109][110][111][112][113][114][115]. A continuous traveling wave EM GB with frequency f 0 , propagating in the zdirection with linear polarization along the x-direction, passes through a transverse static magnetic field, cf.…”

Section: Magnetic Gw-emw Conversion In a Vhf Em Gaussian Beammentioning

confidence: 99%

Gravitational Waves as a Big Bang Thermometer

Ringwald,

Schütte-Engel,

Tamarit

2020

Preprint

View full text Add to dashboard Cite

There is a guaranteed background of stochastic gravitational waves produced in the thermal plasma in the early universe. Its energy density per logarithmic frequency interval scales with the maximum temperature T max which the primordial plasma attained at the beginning of the standard hot big bang era. It peaks in the microwave range, at around 80 GHz [106.75/g * s (T max )] 1/3 , where g * s (T max ) is the effective number of entropy degrees of freedom in the primordial plasma at T max . We present a stateof-the-art prediction of this Cosmic Gravitational Microwave Background (CGMB) for general models, and carry out calculations for the case of the Standard Model (SM) as well as for several of its extensions. On the side of minimal extensions we consider the Neutrino Minimal SM (νMSM) and the SM -Axion -Seesaw -Higgs portal inflation model (SMASH), which provide a complete and consistent cosmological history including inflation. As an example of a non-minimal extension of the SM we consider the Minimal Supersymmetric Standard Model (MSSM). Furthermore, we discuss the current upper limits and the prospects to detect the CGMB in laboratory experiments and thus measure the maximum temperature and the effective number of degrees of freedom at the beginning of the hot big bang.

show abstract

Diffraction from Embedded Reflectors in Li-Baker HFGW Detector

Cited by 7 publications

References 25 publications

Challenges and opportunities of gravitational-wave searches at MHz to GHz frequencies

Challenges and opportunities of gravitational-wave searches at MHz to GHz frequencies

Hunt for Light Primordial Black Hole Dark Matter with Ultra-High-Frequency Gravitational Waves

Gravitational Waves as a Big Bang Thermometer

Contact Info

Product

Resources

About