CMB circular and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math>-mode polarization from new interactions

Bartolo, N.; Hoseinpour, Ahmad; Matarrese, S.; Orlando, Giorgio; Zarei, Moslem

doi:10.1103/physrevd.100.043516

Cited by 23 publications

(18 citation statements)

References 63 publications

(96 reference statements)

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“…Existing studies of P-violating bispectra and trispectra [62][63][64][65][66][67][68][69][70][71][72][73][74][75] require the presence of either tensor modes or broken rotational symmetry. These studies are thus aimed to probe the P or CP of the inflaton background or the gravitational interactions.…”

Section: Introductionmentioning

confidence: 99%

Probing P and CP violations on the cosmological collider

Liu

Tong

Wang

et al. 2020

J. High Energ. Phys.

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In direct analogy to the 4-body decay of a heavy scalar particle, the 4-point correlation function of primordial fluctuations carries P and CP information. The CP violation appears as a P-odd angular dependence in the imaginary part of the trispectrum in momentum space. We construct a model with axion-like couplings which leads to observably large CP-violating trispectrum for future surveys. Furthermore, we show the importance of on-shell particle production in observing P-and CP-violating signals. It is impossible to observe these signals from local 4-scalar EFT operators that respect dS isometries, and thus any such observation can rule out single-field EFT with sufficiently small slow-roll parameters. This calculation opens a new frontier of studying P and CP at very high energy scales. * Electronic address: taoliu@ust.hk † Electronic address: xtongac@connect.ust.hk ‡ Electronic address: phyw@ust.hk § Electronic address:

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Section: Introductionmentioning

confidence: 99%

Probing P and CP violations on the cosmological collider

Liu

Tong

Wang

et al. 2020

J. High Energ. Phys.

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“…We are now ready to compute the time evolution of the circular polarisation component by inputting the appropriate electron densities and A -matrix elements. This has been done for low energy photons in [46].…”

Section: A Boltzmann Formalism For Generic Interactionsmentioning

confidence: 99%

Polarisation of high energy gamma-rays after scattering

Bœhm

Campo

Ramirez-Quezada

et al. 2019

J. Cosmol. Astropart. Phys.

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The polarisation of sunlight after scattering off the atmosphere was first described by Chandrasekhar using a geometrical description of Rayleigh interactions. Kosowsky later extended Chandrasekhar's formalism by using Quantum Field Theory (QFT) to describe the polarisation of the Cosmological Microwave Background radiation. Here we focus on a case that is rarely discussed in the literature, namely the polarisation of high energy radiation after scattering off particles. After demonstrating why the geometrical and low energy QFT approaches fail in this case, we establish the transport formalism that allows to describe the change of polarisation of high energy photons when they propagate through space or the atmosphere. We primarily focus on Compton interactions but our approach is general enough to describe e.g. the scattering of high energy photons off new particles or through new interactions. Finally we determine the conditions for a circularly polarised γ-ray signal to keep the same level of circular polarisation as it propagates through its environment.

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“…The current authors have carried out a systematic study of the generation of the V-mode polarization by the forward scattering of CMB photons from spin-2 [35] and spin-1=2 [36] particles. In this paper, we continue our study of V-mode generation by examining the forward scattering of CMB photons with spin-1 particles.…”

Section: Introductionmentioning

confidence: 99%

CMB V modes from photon-photon forward scattering revisited

et al. 2020

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Recent literature has shown that photon-photon forward scattering mediated by Euler-Heisenberg interactions may generate some amount of the circular polarization (V modes) in the cosmic microwave background (CMB) photons. However, there is an apparent contradiction among the different references about the predicted level of the amplitude of this circular polarization. In this work, we will resolve this discrepancy by showing that with a quantum Boltzmann equation formalism, we obtain the same amount of circular polarization as using a geometrical approach that is based on the index of refraction of the cosmological medium. We will show that the expected amplitude of V modes is expected to be ≈8 orders of magnitude smaller than the amplitude of E-polarization modes that we actually observe in the CMB, thus confirming that it is going to be challenging to observe such a signature. Throughout the paper, we also develop a general method to study the generation of V modes from photon-photon and photon-spin-1massive-particle forward scatterings without relying on a specific interaction, which thus represent possible new signatures of physics beyond the Standard Model.

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CMB circular andB-mode polarization from new interactions

Cited by 23 publications

References 63 publications

Probing P and CP violations on the cosmological collider

Probing P and CP violations on the cosmological collider

Polarisation of high energy gamma-rays after scattering

CMB V modes from photon-photon forward scattering revisited

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