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Can primordial parity violation explain the observed cosmic birefringence?

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Can primordial parity violation explain the observed cosmic birefringence?

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Authors: Tomohiro Fujita, Yuto Minami, Maresuke Shiraishi, Shuichiro Yokoyama.
https://arxiv.org/abs/2208.08101
(Oksana)

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Holography for Astrophysics and Cosmology

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Scope We gather world experts working on applications of gauge/gravity duality to astrophysical and cosmological phenomena. We will hear how holography is applied in the context of neutron stars, where the density is too large for the use of lattice simulations, but not large enough for perturbation theory to be applicable.

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Scaling Transformations and the Origins of Light Relics Constraints from Cosmic Microwave Background Observations

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Scaling Transformations and the Origins of Light Relics Constraints from Cosmic Microwave Background Observations

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Authors: Fei Ge, Francis-Yan Cyr-Racine, Lloyd Knox
https://arxiv.org/abs/2210.16335
(Ben)

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Scaling Transformations and the Origins of Light Relics Constraints from Cosmic Microwave Background Observations

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We use here a family of scaling transformations, that scale key rates in the evolution equations, to analytically understand constraints on light relics from cosmic microwave background (CMB) maps, given cosmological models of varying degrees of complexity.

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Completely Dark Matter from Rapid-Turn Multi-field Inflation

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Completely Dark Matter from Rapid-Turn Multi-field Inflation

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Authors: Edward W. Kolb, Andrew J. Long, Evan McDonough, Guillaume Payeur
https://arxiv.org/pdf/2211.14323.pdf
(Oksana)

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https://arxiv.org/abs/2212.02535

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Fluctuations play a critical role in cosmology. They are relevant across a range of phenomena from the dynamics of inflation to the formation of structure. In many cases, these fluctuations are coarse grained and follow a Gaussian distribution as a consequence of the Central Limit Theorem.

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A Measurement of the CMB Temperature Power Spectrum and Constraints on Cosmology from the SPT-3G 2018 TT/TE/EE Data Set

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A Measurement of the CMB Temperature Power Spectrum and Constraints on Cosmology from the SPT-3G 2018 TT/TE/EE Data Set

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SPT-3G Collaboration
https://arxiv.org/abs/2212.05642
(Ben)

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Authors: L. Balkenhol, D. Dutcher, A. Spurio Mancini, A. Doussot, K. Benabed, S. Galli, P. A. R. Ade, A. J. Anderson, B. Ansarinejad, M. Archipley, A. N. Bender, B. A. Benson, F. Bianchini, L. E. Bleem, F. R. Bouchet, L. Bryant, E. Camphuis, J. E. Carlstrom, T. W. Cecil, C. L. Chang, P. Chaubal, P. M. Chichura, T.-L. Chou, A. Coerver, T. M. Crawford, A. Cukierman, C. Daley, T. de Haan, K. R. Dibert, M. A. Dobbs, W. Everett, C. Feng, K. R. Ferguson, A. Foster, A. E. Gambrel, R. W. Gardner, N. Goeckner-Wald, R. Gualtieri, F. Guidi, S. Guns, N. W. Halverson, E. Hivon, G. P. Holder, W. L. Holzapfel, J. C. Hood, N. Huang, L. Knox, M. Korman, C.-L. Kuo, A. T. Lee, A. E. Lowitz, C. Lu, M. Millea, J. Montgomery, Y. Nakato, T. Natoli, G. I. Noble, V. Novosad, Y. Omori, S. Padin, Z. Pan, P. Paschos, K. Prabhu, W. Quan, M. Rahimi, A. Rahlin, C. L. Reichardt, M. Rouble, J. E. Ruhl, E. Schiappucci, G. Smecher, J. A. Sobrin, A. A. Stark, J. Stephen, A. Suzuki, C. Tandoi, K. L. Thompson, B. Thorne, C. Tucker, C. Umilta, J. D. Vieira, G. Wang, N. Whitehorn, W. L. K. Wu, V. Yefremenko, M. R. Young, J. A. Zebrowski

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Abstract: We present a sample-variance-limited measurement of the temperature power spectrum ($TT$) of the cosmic microwave background (CMB) using observations of a $\sim\! 1500 \,\mathrm{deg}^2$ field made by SPT-3G in 2018. We report multifrequency power spectrum measurements at 95, 150, and 220GHz covering the angular multipole range $750 \leq \ell < 3000$. We combine this $TT$ measurement with the published polarization power spectrum measurements from the 2018 observing season and update their associated covariance matrix to complete the SPT-3G 2018 $TT/TE/EE$ data set. This is the first analysis to present cosmological constraints from SPT $TT$, $TE$, and $EE$ power spectrum measurements jointly. We blind the cosmological results and subject the data set to a series of consistency tests at the power spectrum and parameter level. We find excellent agreement between frequencies and spectrum types and our results are robust to the modeling of astrophysical foregrounds. We report results for $\Lambda$CDM and a series of extensions, drawing on the following parameters: the amplitude of the gravitational lensing effect on primary power spectra $A_\mathrm{L}$, the effective number of neutrino species $N_{\mathrm{eff}}$, the primordial helium abundance $Y_{\mathrm{P}}$, and the baryon clumping factor due to primordial magnetic fields $b$. We find that the SPT-3G 2018 $T/TE/EE$ data are well fit by $\Lambda$CDM with a probability-to-exceed of $15\%$. For $\Lambda$CDM, we constrain the expansion rate today to $H_0 = 68.3 \pm 1.5\,\mathrm{km\,s^{-1}\,Mpc^{-1}}$ and the combined structure growth parameter to $S_8 = 0.797 \pm 0.042$. The SPT-based results are effectively independent of Planck, and the cosmological parameter constraints from either data set are within $<1\,\sigma$ of each other. (abridged)

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From: Lennart Balkenhol [ view email]
[v1] Mon, 12 Dec 2022 00:54:11 UTC (5,438 KB)

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# data[].attributes.attachment_link.title
A Measurement of the CMB Temperature Power Spectrum and Constraints on Cosmology from the SPT-3G 2018 TT/TE/EE Data Set

# data[].attributes.attachment_link.description
We present a sample-variance-limited measurement of the temperature power spectrum ($TT$) of the cosmic microwave background (CMB) using observations of a $\sim\! 1500 \,\mathrm{deg}^2$ field made by SPT-3G in 2018. We report multifrequency power spectrum measurements at 95, 150, and 220GHz covering the angular multipole range $750 \leq \ell < 3000$.

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Bootstrapping Multi-Field Inflation: non-Gaussianities from light scalars revisited

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Bootstrapping Multi-Field Inflation: non-Gaussianities from light scalars revisited

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Authors: Dong-Gang Wang, Guilherme L. Pimentel, Ana Achúcarro
(Oksana)

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Bootstrapping Multi-Field Inflation: non-Gaussianities from light scalars revisited

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Primordial non-Gaussianities from multi-field inflation are a leading target
for cosmological observations, because of the possible large correlations
generated between long and short distances. These signatures are captured by
the local shape of the scalar bispectrum. In this paper, we revisit the…

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Author: Daniel Green
(Ben)

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TASI Lectures on Cosmic Signals of Fundamental Physics

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The history of the Universe and the forces that shaped it are encoded in maps of the cosmos. From understanding these maps, we gain insights into nature that are inaccessible by other means. Unfortunately, the connection between fundamental physics and cosmic observables is often left to experts (and/or computers), making the general lessons from data obscure to many particle theorists.

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Confronting Interacting Dark Radiation Scenarios with Cosmological Data

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Confronting Interacting Dark Radiation Scenarios with Cosmological Data

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Authors: Thejs Brinckmann, Jae Hyeok Chang, Peizhi Du, Marilena LoVerde
(Ben)

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Confronting interacting dark radiation scenarios with cosmological data

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Dark radiation (DR) is generally predicted in new physics scenarios that address fundamental puzzles of the Standard Model or tensions in the cosmological data. Cosmological data has the sensitivity to constrain not only the energy density of DR, but also whether it is interacting.

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(Ramkishor)

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Ruling Out Primordial Black Hole Formation From Single-Field Inflation

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The most widely studied formation mechanism of a primordial black hole (PBH) is collapse of large-amplitude perturbation on small scales generated in single-field inflation. In this Letter, we calculate one-loop correction to the large-scale power spectrum in such a model.

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(Ramkishor)

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The Primordial Black Hole Formation from Single-Field Inflation is Not Ruled Out

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A standard scenario to form primordial black holes in the early universe is based on a phase of ultra-slow-roll in single-field inflation when the amplitude of the short scale modes is enhanced compared to the CMB plateau.

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Paper by Burgess, Choi and Quevedo about axion quality problem (Florian)

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UV and IR Effects in Axion Quality Control

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Motivated by recent discussions and the absence of exact global symmetries in UV completions of gravity we re-examine the axion quality problem (and naturalness issues more generally) using antisymmetric Kalb-Ramond (KR) fields rather than their pseudoscalar duals, as suggested by string and higher dimensional theories.

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Cosmological Flow of Primordial Correlators

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Cosmological Flow of Primordial Correlators

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Authors: Denis Werth, Lucas Pinol, Sébastien Renaux-Petel
(Ben)

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Cosmological Flow of Primordial Correlators

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Correlation functions of primordial density fluctuations provide an exciting probe of the physics governing the earliest moments of our Universe. However, the standard approach to compute them is technically challenging. Theoretical predictions are therefore available only in restricted classes of theories. In this Letter, we present a complete method to systematically compute tree-level inflationary correlators.

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A Minimal Explanation of the Primordial Cosmological Perturbations

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A Minimal Explanation of the Primordial Cosmological Perturbations

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Authors: Neil Turok, Latham Boyle
(Ben/all)

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A Minimal Explanation of the Primordial Cosmological Perturbations

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We outline a new explanation for the primordial density perturbations in
cosmology. Dimension zero fields are a minimal addition to the Standard Model
of particle physics: if the Higgs doublet is emergent, they cancel the vacuum
energy and both Weyl anomalies without introducing any new particles.
F…

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Primordial black hole mass functions as a probe of cosmic origin

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Primordial black hole mass functions as a probe of cosmic origin

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Authors: Yi-Fu Cai, Chengfeng Tang, Geyu Mo, Shengfeng Yan, Chao Chen, Xiaohan Ma, Bo Wang, Wentao Luo, Damien Easson, Antonino Marciano

(Oksana)

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(Ramkishor)

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Response to criticism on "Ruling Out Primordial Black Hole Formation From Single-Field Inflation": A note on bispectrum and one-loop correction in single-field inflation with primordial black hole formation

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Primordial black holes (PBHs) can be formed from the collapse of large-amplitude perturbation on small scales in the early universe. Such an enhanced spectrum can be realized by introducing a flat region in the potential of single-field inflation, which makes the inflaton go into a temporary ultraslow-roll (USR) period.

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The Primordial Black Hole Formation from Single-Field Inflation is Still Not Ruled Out

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The Primordial Black Hole Formation from Single-Field Inflation is Still Not Ruled Out

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A. Riotto

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The Primordial Black Hole Formation from Single-Field Inflation is Still Not Ruled Out

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In response to a recent criticism, appeared in arXiv:2303.00341, we argue that the standard scenario to form primordial black holes in the early universe based on a phase of ultra-slow-roll in single-field inflation is not ruled out.

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Authors: R. Durrer,O. Sobol, and S. Vilchinskii

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(Salome)

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Authors: Laura Iacconi, David J. Mulryne

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Multi-field inflation with large scalar fluctuations: non-Gaussianity and perturbativity

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Multi-field inflation with large scalar fluctuations: non-Gaussianity and perturbativity

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(Oksana)

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Multi-field inflation with large scalar fluctuations: non-Gaussianity and perturbativity

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Recently multi-field inflation models that can produce large scalar fluctuations on small scales have drawn a lot of attention, primarily because they could lead to primordial black hole production and generation of large second-order gravitational waves. In this work, we focus on models where the scalar fields responsible for inflation live on a hyperbolic field space.