Cosmic Microwave Background spectral distortions from cosmic string loops

Anthonisen, Madeleine; Brandenberger, Robert H.; Laguë, Alex; Morrison, Ian A.; Xia, Daixi

doi:10.1088/1475-7516/2016/02/047

Cited by 6 publications

(5 citation statements)

References 77 publications

(104 reference statements)

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“…The effect is similar to the one produced by cusp annihilation from cosmic string loops which has been studied in[21].…”

supporting

confidence: 53%

Cosmic Rays and Spectral Distortions from Collapsing Textures

Brandenberger,

Cyr,

Jiao

2020

Preprint

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We compute the energy spectrum of photons produced by the unwinding of a scaling distribution of cosmic textures, and discuss the implications for the spectrum of high energy cosmic rays, and for CMB spectral distortions. Textures lead to a contribution to the photon flux which scales as E 3 F (E) ∼ E 3/2 . Hence, the tightest constraints on the texture model come from the highest energies from which primordial photons can reach us without being scattered by the CMB and other foregrounds. Textures lead to both µ type and y type distortions. While the constraints on the texture model coming from the current COBE bounds are weaker than the bounds from the angular power spectrum of the CMB, future surveys such as PIXIE can lead to stronger bounds.

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“…The effect is similar to the one produced by cusp annihilation from cosmic string loops which has been studied in[21].…”

supporting

confidence: 53%

Cosmic Rays and Spectral Distortions from Collapsing Textures

Brandenberger,

Cyr,

Jiao

2020

Preprint

Self Cite

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“…The effect is similar to the one produced by cusp annihilation from cosmic string loops which has been studied in[31].…”

supporting

confidence: 53%

Cosmic rays and spectral distortions from collapsing textures

Brandenberger

Cyr

Jiao

2020

J. Cosmol. Astropart. Phys.

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We compute the energy spectrum of photons {and neutrinos} produced by the unwinding of a scaling distribution of cosmic textures, and discuss the implications for the spectrum of high energy cosmic rays, and for CMB spectral distortions. Textures lead to a contribution to the photon flux which scales as E3 F(E) ∼ E3/2. Hence, the tightest constraints on the texture model come from the highest energies from which primordial photons can reach us without being scattered by the CMB and other foregrounds. Textures lead to both μ type and y type distortions. While the constraints on the texture model coming from the current COBE bounds are weaker than the bounds from the angular power spectrum of the CMB, future surveys such as PIXIE can lead to stronger bounds. {The high energy neutrino flux is constrained by data from the Pierre Auger experiment and yields a bound on the energy scale of textures which is competitive with CMB bounds.}

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“…While a measurement of CMB spectral distortions could shed light on several aspects of physics beyond ΛCDM such as, e.g., gravitino decay [13], cosmic strings [14], magnetic fields [15], hidden photons [16], and dark matter interactions [17], just to name a few, we stress that spectral distortions could provide significant information on inflation through the contribution coming from primordial perturbations [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 91%

μdistortions or running: A guaranteed discovery from CMB spectrometry

2016

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We discuss the implications of a PIXIE-like experiment, which would measure μ-type spectral distortions of the cosmic microwave background (CMB) at a level of σ μ ¼ ð1=nÞ × 10 −8 , with n ≥ 1 representing an improved sensitivity (e.g. n ¼ 10 corresponds to PRISM). Using Planck data and considering the six-parameter ΛCDM model, we compute the posterior for μ 8 ≡ μ × 10 8 and find μ 8 ¼ 1.57−0.52 (68% C.L.) when the running α s of the spectral index is included. We point out that a sensitivity of about 3 × PIXIE implies a guaranteed discovery: μ distortion is detected or α s ≥ 0 is excluded (both at 95% C.L. or higher). This threshold sensitivity sets a clear benchmark for CMB spectrometry. For a combined analysis of PIXIE and current Planck data, we discuss the improvement on measurements of the tilt n s and the running α s and the dependence on the choice of the pivot. A fiducial running of α s ¼ −0.01 (close to the Planck best fit) leads to a detection of negative running at 2σ for 5 × PIXIE. A fiducial running of α s ¼ −0.02, still compatible with Planck, requires 3 × PIXIE to rule out α s ¼ 0 (at 95% C.L.). We propose a convenient and compact visualization of the improving constraints on the tilt, running and tensor-to-scalar ratio.

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Cosmic Microwave Background spectral distortions from cosmic string loops

Cited by 6 publications

References 77 publications

Cosmic Rays and Spectral Distortions from Collapsing Textures

Cosmic Rays and Spectral Distortions from Collapsing Textures

Cosmic rays and spectral distortions from collapsing textures

μdistortions or running: A guaranteed discovery from CMB spectrometry

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