Circularly polarized EM radiation from GW binary sources

Shakeri, Soroush; Allahyari, Alireza

doi:10.1088/1475-7516/2018/11/042

Cited by 12 publications

(10 citation statements)

References 60 publications

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“…In this paper, we focus on the circular polarization. In astrophysics, circular polarization may arise in masers [6,7], gamma-ray-burst afterglows [8][9][10][11], jets of active galactic nuclei [12][13][14][15], and pulsars [16][17][18][19]. In addition, circular polarization has recently been discussed also in the context of the CMB [20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Circular polarization of the cosmic microwave background from vector and tensor perturbations

Inomata

Kamionkowski

2019

Phys. Rev. D

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Circular polarization of the cosmic microwave background (CMB) can be induced by Faraday conversion of the primordial linearly polarized radiation as it propagates through a birefringent medium. Recent work has shown that the dominant source of birefringence from primordial density perturbations is the anisotropic background CMB. Here we extend prior work to allow for the additional birefringence that may arise from primordial vector and tensor perturbations. We derive the formulas for the power spectrum of the induced circular polarization and apply those to the standard cosmology. We find the root-variance of the induced circular polarization to be V 2 ∼ 3 × 10 −14 for scalar perturbations and V 2 ∼ 7 × 10 −18 (r/0.06) for tensor perturbations with a tensor-to-scalar ratio r.

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Section: Introductionmentioning

confidence: 99%

Circular polarization of the cosmic microwave background from vector and tensor perturbations

Inomata

Kamionkowski

2019

Phys. Rev. D

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“…Some researches suggest that GWs emitted by the merging of binary neutron stars could yield significant information about the equation-of-state (EoS) of dense matter and the related gravitational theory, see e.g., [14][15][16][17][18][19]. As recently discussed in [20], GWs produced by binary mergers lead to circular polarization signal generation which may be captured by X-ray polarimetry missions. The detection of GWs with cosmological origins (unlike their astrophysical counterpart have a stochastic and random character) has special significance in the sense that it can be physically relevant for the Universe evolution in the very early stages.…”

Section: Introductionmentioning

confidence: 99%

The quark chemical potential of QCD phase transition and the stochastic background of gravitational waves

2019

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The detection of stochastic background of gravitational waves (GWs), produced by cosmological phase transitions (PTs), is of fundamental importance because allows to probe the physics related to PT energy scales. Motivated by the decisive role of non-zero quark chemical potential towards understanding physics in the core of neutron stars, quark stars and heavy-ion collisions, in this paper we qualitatively explore the stochastic background of GW spectrum generated by a cosmological source such as high-density QCD first order PT during the early Universe. Specifically, we calculate the frequency peak f peak redshifted at today time and the fractional energy density Ωgwh 2 in light of equation-of-state improved by the finite quark (baryon) chemical potential (we consider an effective three flavor chiral quarks model of QCD). Our calculations reveal a striking increase in f peak and Ωgwh 2 due to the quark chemical potential, which means to improve the chances of detection, in possible future observations (in particular SKA/PTA experiments), of the stochastic background of GWs from QCD first order PT. Even if the improvements could be weak, by updating the sensitivity of relevant detectors in the future, we can still remain hopeful. Concerning the phenomenological contribution of QCD equation-of-state, and in particular the possibility to detect a stochastic GW signal, we further show that the role of the quark chemical potential is model-dependent. This feature allows to discriminate among possible QCD effective models depending on their capability to shed light on the dynamic of QCD-PT through future observations of primordial GWs. In this perspective, the results are indeed encouraging to employ the GWs to study the QCD PT in high density strong interaction matter.

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“…The wealth of science that joint detections bring can not be probed with either messenger alone. Other counterparts like neutrino emissions and polarization features associated to this GW event can shed more light on the nature of the merger [14,15]. The importance of such a detection is because the redshift and the location of the source are obtained with more precision breaking the degeneracies in the parameter space.…”

Section: Introductionmentioning

confidence: 98%

No slip gravity in light of LISA standard sirens

Allahyari,

Nunes,

Mota

2021

Preprint

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Standard sirens (SS) are the gravitational wave analog of the astronomical standard candles, and can provide powerful information about the dynamics of the Universe up to very high z values. In this work, we generate three mock SS catalogs based on the merger of massive black hole binaries which are expected to be observed in the LISA operating frequency band. Then, we perform an analysis to test modifications of general relativity (GR) inspired by the No Slip Gravity framework. We find that in the best scenarios, we can constrain the free parameters which quantify deviations from GR to 21% accuracy, while the Hubble parameter can be simultaneously fit to 6% accuracy. In combination with CMB information, we find a 15% accuracy on the modified gravity free parameters and 0.7% accuracy on the Hubble parameter. Therefore, the SS events at very large cosmological distances to be observed in LISA band will provide a unique way to test nature of gravity.

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Circularly polarized EM radiation from GW binary sources

Cited by 12 publications

References 60 publications

Circular polarization of the cosmic microwave background from vector and tensor perturbations

Circular polarization of the cosmic microwave background from vector and tensor perturbations

The quark chemical potential of QCD phase transition and the stochastic background of gravitational waves

No slip gravity in light of LISA standard sirens

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