Primordial gravity wave background anisotropies

Alba, Vasyl; Maldacena, Juan

doi:10.1007/jhep03(2016)115

Cited by 49 publications

(83 citation statements)

References 27 publications

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“…A few salient points of the power spectra are discussed here. The continuous matching condition generates a power spectrum identical to the one from single-field inflation, as recently obtained by Alba and Maldacena [29],…”

Section: The K-dependence In the Power Spectrasupporting

confidence: 65%

“…We compared the k-dependence followed from two different matching conditions in the simplified CST bounce universe with that of the single-field inflationary scenario [29]. The results are presented in Table 2.…”

Section: The K-dependence In the Power Spectramentioning

confidence: 99%

“…In this section we attempt to make a side by side comparison on the similarities and the differences of the gravitational waves spectra obtained from the CST bounce universe model and the single-field inflation model [29]. The complete GW wavefunctions from the bounce model and from the single-field inflation model are plotted together in Fig.…”

Section: Tensor Modes Of Cstb Universe Versus Inflationmentioning

confidence: 99%

“…In this project we are going to obtain a complete solution to the gravitational waves equations in a simplified bounce universe model, taking careful account of two possible matching conditions [27,28]. We also compute the gravitational waves spectrum generated from this bounce universe and compare it with the gravitational waves spectrum in a single field inflation model, recently obtained in [29]. The bounce universe model, the gravitational waves spectrum of which we will analyse in detail, was derived from low energy effective action of string theory.…”

Section: Introductionmentioning

confidence: 99%

“…A side-byside comparison with the single-field inflationary scenario is presented in Section 4.2; and afterwards we conclude with a summary of results and an outlook. Pertinent resulted of the GW spectrum from single-field inflation recently obtained by Alba and Maldacena [29] is reproduced in Appendix A for easy reference and comparison.…”

Section: Introductionmentioning

confidence: 99%

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Primordial gravitational waves spectrum in the Coupled-Scalar-Tachyon Bounce Universe

Zhang

Cheung

2020

Eur. Phys. J. C

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We derive in detail the equations of motion for the tensorial modes of primordial metric perturbations in the Coupled-Scalar-Tachyon Bounce Universe. We solve for the gravitational wave equations in the pre-bounce contraction and the post-bounce expansion epochs. To match the solutions of the tensor perturbations, we idealise the bounce process yet retaining the essential physical properties of the bounce universe. We put forward two matching conditions: one ensures the continuity of the gravitational wave functions and the other respects the symmetric nature of the bounce dynamics. The matching conditions connect the two independent modes of gravitational waves solutions before and after the bounce. We further analyse the scale dependence and time dependence of the gravitational waves spectra in the bounce universe and compare them with the primordial spectrum in the single field inflation scenario. We discuss the implications to early universe physics and present model independent observational signatures extracted from the bounce universe.

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Section: The K-dependence In the Power Spectrasupporting

confidence: 65%

Section: The K-dependence In the Power Spectramentioning

confidence: 99%

Section: Tensor Modes Of Cstb Universe Versus Inflationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Primordial gravitational waves spectrum in the Coupled-Scalar-Tachyon Bounce Universe

Zhang

Cheung

2020

Eur. Phys. J. C

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Detection of early-universe gravitational-wave signatures and fundamental physics

et al. 2022

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Detection of a gravitational-wave signal of non-astrophysical origin would be a landmark discovery, potentially providing a significant clue to some of our most basic, big-picture scientific questions about the Universe. In this white paper, we survey the leading early-Universe mechanisms that may produce a detectable signal—including inflation, phase transitions, topological defects, as well as primordial black holes—and highlight the connections to fundamental physics. We review the complementarity with collider searches for new physics, and multimessenger probes of the large-scale structure of the Universe.

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New horizons for fundamental physics with LISA

et al. 2022

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The Laser Interferometer Space Antenna (LISA) has the potential to reveal wonders about the fundamental theory of nature at play in the extreme gravity regime, where the gravitational interaction is both strong and dynamical. In this white paper, the Fundamental Physics Working Group of the LISA Consortium summarizes the current topics in fundamental physics where LISA observations of gravitational waves can be expected to provide key input. We provide the briefest of reviews to then delineate avenues for future research directions and to discuss connections between this working group, other working groups and the consortium work package teams. These connections must be developed for LISA to live up to its science potential in these areas.

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Primordial gravity wave background anisotropies

Abstract: Abstract:We consider the primordial gravity wave background produced by inflation. We compute the small anisotropy produced by the primordial scalar fluctuations.

Cited by 49 publications

References 27 publications

Primordial gravitational waves spectrum in the Coupled-Scalar-Tachyon Bounce Universe

Primordial gravitational waves spectrum in the Coupled-Scalar-Tachyon Bounce Universe

Detection of early-universe gravitational-wave signatures and fundamental physics

New horizons for fundamental physics with LISA

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