Gauge transformation of scalar induced tensor perturbation during matter domination

Ali, Arshad; Gong, Yungui; Lu, Yizhou

doi:10.1103/physrevd.103.043516

Cited by 26 publications

(23 citation statements)

References 73 publications

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“…The gauge issue of induced GWs: Tensor modes are subject to gauge ambiguities at second order due to mode mixing. Since the work of Hwang, Jeong and Noh [149] in 2017 there has been an extensive discussion on the gauge issue of induced GWs [150][151][152][153][154][155][156][157][158][159][160][161][162].…”

Section: Induced Gws Historymentioning

confidence: 99%

“…Note that in Equation (159) we identify the co-moving inter-PBH separation as the UV cut-off in Equation (152). This is because the fluid description of the PBH gas is valid only for k < k UV , i.e., at distances much larger than d i .…”

Section: Pbh Dominated Eramentioning

confidence: 99%

“…Although the gauge issue was mentioned earlier by Matarrese, Mollerach and Bruni [37], it was not until [149] that it received more attention. From then and on, there has been a big activity to understand the problem [150][151][152][153][154][155][156][157][158][159][160][161][162]. For example in Refs.…”

Section: The Gauge Issuementioning

confidence: 99%

“…They found that the gauge dependence is in general present. Later studies [153][154][155][156][157][158][159][160][161][162], proposed partial solutions and investigated in which situations the spectrum of induced GW might be well defined. We dedicate Section 7.1 to explain the origin of the gauge issue.…”

Section: The Gauge Issuementioning

confidence: 99%

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Scalar Induced Gravitational Waves Review

2021

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We provide a review on the state-of-the-art of gravitational waves induced by primordial fluctuations, so-called induced gravitational waves. We present the intuitive physics behind induced gravitational waves and we revisit and unify the general analytical formulation. We then present general formulas in a compact form, ready to be applied. This review places emphasis on the open possibility that the primordial universe experienced a different expansion history than the often assumed radiation dominated cosmology. We hope that anyone interested in the topic will become aware of current advances in the cosmology of induced gravitational waves, as well as becoming familiar with the calculations behind.

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Section: Induced Gws Historymentioning

confidence: 99%

Section: Pbh Dominated Eramentioning

confidence: 99%

Section: The Gauge Issuementioning

confidence: 99%

Section: The Gauge Issuementioning

confidence: 99%

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Scalar Induced Gravitational Waves Review

2021

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“…We recommend the interested readers to read refs. [225][226][227][228][229][230][231][232][233][234][235][236][237][238][239][240] for details. Figure 2 (Color online) In the (a) panel, the orange line presents an example of the present energy spectrum of GWs from domain walls, Ω GW,0 h 2 , using the approximation method in ref.…”

Section: Induced Gravitational Wavesmentioning

confidence: 99%

The Gravitational-wave physics II: Progress

Bian

Cai

Cao

et al. 2021

Sci. China Phys. Mech. Astron.

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It has been a half-decade since the first direct detection of gravitational waves, which signifies the coming of the era of the gravitational-wave astronomy and gravitational-wave cosmology. The increasing number of the detected gravitational-wave events has revealed the promising capability of constraining various aspects of cosmology, astronomy, and gravity. Due to the limited space in this review article, we will briefly summarize the recent progress over the past five years, but with a special focus on some of our own work for the Key Project "Physics associated with the gravitational waves" supported by the National Natural Science Foundation of China. In particular, (1) we have presented the mechanism of the gravitational-wave production during some physical processes of the early Universe, such as inflation, preheating and phase transition, and the cosmological implications of gravitational-wave measurements; (2) we have put constraints on the neutron star maximum mass according to GW170817 observations; (3) we have developed a numerical relativity algorithm based on the finite element method and a waveform model for the binary black hole coalescence along an eccentric orbit.

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