Probing GHz gravitational waves with graviton–magnon resonance

Ito, Asuka; Ikeda, Tomoyuki; Miuchi, K.; Soda, Jiro

doi:10.1140/epjc/s10052-020-7735-y

Cited by 82 publications

(74 citation statements)

References 53 publications

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“…It would enable us to investigate the memory effect of the gravitational waves for various models of the baryogenesis or leptogenesis without complicated discussions. Such imprints of the primordial chirality violation in the plasma might be observed by the recently proposed high frequency gravitational wave detectors [85][86][87][88] since the Chern-Simons term-like local contribution we investigated here becomes dominant for the high momentum region k T .…”

Section: Jhep05(2021)292 5 Discussionmentioning

confidence: 72%

Chiral gravitational effect in time-dependent backgrounds

Kamada

Kume

Yamada

2021

J. High Energ. Phys.

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Gravitational counterpart of the chiral magnetic effect, which is referred as the chiral gravitational effect, can also be of interest in a cosmological setup. In this study, we investigate this effect in the time-dependent chiral asymmetric fermion background and in the expanding spacetime by formulating the effective action of gravitational waves. We also analyze the anomaly equation to see how the backreaction from gravitational waves to thermal chiral plasma occurs. We find that the non-trivial time dependence of chiral chemical potential, which can be induced in some scenarios of baryogenesis, is the key ingredient of the chiral gravitational effect. It turns out that the “memory” of the effect is imprinted on the high frequency gravitational waves propagating in the plasma. Cosmological implications and potential effects on the gravitational wave observation are briefly discussed.

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Section: Jhep05(2021)292 5 Discussionmentioning

confidence: 72%

Chiral gravitational effect in time-dependent backgrounds

Kamada

Kume

Yamada

2021

J. High Energ. Phys.

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“…This allows a search across the 1 to 25 MHz range with 382 Hz frequency resolution as described in Section III A and seen in Figure 1. These measurements extend the gravitational wave spectrum beyond what is accessible with PTA, LISA, LIGO, Virgo, KAGRA, and GHz experiments [4,[23][24][25][26][27][28][29][30][31][38][39][40].…”

Section: Discussionmentioning

confidence: 99%

Searching for MHz gravitational waves from harmonic sources

Martinez

Kamai

2020

Class. Quantum Grav.

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A MHz gravitational wave search for harmonic sources was conducted using a 704-hr dataset obtained from the Holometer, a pair of 40-meter power recycled Michelson interferometers. Our search was designed to look for cosmic string loops and eccentric black hole binaries in an entirely unexplored frequency range from 1 to 25 MHz. The measured cross-spectral density between both interferometers was used to perform four different searches. First, we search to identify any fundamental frequencies bins that have excess power above 5σ. Second, we reduce the per-bin threshold on any individual frequency bin by employing that a fundamental frequency and its harmonics all collectively lie above a threshold. We vary the number of harmonics searched over from n = 4 up to n = 23. Third, we perform an agnostic approach to identify harmonic candidates that may have a single contaminated frequency bin or follow a power-law dependence. Lastly, we expand on the agnostic approach for individual candidates and search for a potential underlying population of harmonic sources. Each method was tested on the interferometer dataset, as well as a dark noise, photon shot-noise-limited, and simulated Gaussian-noise datasets. We conclude that these four different search methods did not find any candidate frequencies that would be consistent with harmonic sources. This work presents a new way of searching for gravitational wave candidates, which allowed us to survey a previously unexplored frequency range.

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“…Unfortunately, the typical frequencies of the emitted gravitational waves are around GHz and hence cannot be detected by the planned experiments like LISA. However, this frequency range has received increasing interest recently and hence new gravitational wave detectors for such frequency range have been proposed and developed [43][44][45][46][47][48].…”

Section: Conclusion and Prospectsmentioning

confidence: 99%

“…Future attempts of high frequency GW detection are becoming increasingly interesting, as they would open a unique observational window into preheating. In fact, there are proposed experiments for the detection of GWs with such high frequencies [43][44][45][46][47][48], even though their sensitivity needs to be improved significantly in order to provide feasible detection opportunities.…”

Section: Jhep03(2021)021mentioning

confidence: 99%

Gravitational wave spectra from oscillon formation after inflation

Hiramatsu

Sfakianakis

Yamaguchi

2021

J. High Energ. Phys.

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We systematically investigate the preheating behavior of single field inflation with an oscillon-supporting potential. We compute both the properties of the emitted gravitational waves as well as the number density and characteristics of the produced oscillons. By performing numerical simulations for a variety of potential types, we divide the analyzed potentials in two families, each of them containing potentials with varying large- or small-field dependence. We find that the shape of the spectrum and the amplitude of emitted gravitational waves have a universal feature with the peak around the physical wavenumber k/a ∼ m at the inflaton oscillation starting period, irrespective of the exact potential shape. This can be used as a smoking-gun for deducing the existence of a violent preheating phase and possible oscillon formation after inflation. Despite this apparent universality, we also find differences in the shape of the spectrum of emitted gravitational waves between the two families of potentials, leading to discriminating features between them. In particular, all potentials show the emergence of a two-peak structure in the gravitational wave spectrum, arising at the time of oscillon formation. However, potentials that exhibit efficient parametric resonance tend to smear out this structure and by the end of the simulation the two-peak structure is replaced by one broad peak in the GW spectrum. We further compute the number density and properties of the produced oscillons for each potential choice, finding differences in the number density and size distribution of stable oscillons and transient overdensities. We also perform a linear fluctuation analysis and use the corresponding Floquet charts to relate the results of our simulations to the structure of parametric resonance for the various potential types. We find that the growth rate of the scalar perturbations and the associated oscillon formation time are sensitive to the small-field shape of a potential while the macroscopic physical properties of oscillons such as the total number depend on the large-field shape of a potential.

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Probing GHz gravitational waves with graviton–magnon resonance

Cited by 82 publications

References 53 publications

Chiral gravitational effect in time-dependent backgrounds

Chiral gravitational effect in time-dependent backgrounds

Searching for MHz gravitational waves from harmonic sources

Gravitational wave spectra from oscillon formation after inflation

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