☆ 4.6 Article

The impact of primordial magnetic fields on future CMB bounds on inflationary gravitational waves

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2018)

Get Full Text
Add to Collection

Journal

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 8, Pages -

Publisher

IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2018/08/038

Keywords

CMBR experiments; cosmological parameters from CMBR; gravitational waves and CMBR polarization

Categories

Astronomy & Astrophysics Physics, Particles & Fields

Funding

  1. European Research Council [681431, ERC-2015-STG678652]

Ask authors/readers for more resources

Protocol

Community support

Reagent

Community support

We discuss whether an unaccounted contribution to the Cosmic Microwave Background polarization B-mode by primordial magnetic fields (PMFs) can bias future constraints on inflationary gravitational waves. As a case-study, we consider a scale-invariant PMF spectrum with amplitude of approximate to 1 nG on 1 Mpc scales, compatible with current cosmological bounds. We find a degeneracy in the B-mode spectra between PMFs and inflationary gravitational waves. If PMFs of this amplitude are not accounted for, future CMB experiments could claim a false detection of a tensor-to-scalar ratio r approximate to 0.007, close to the predictions of Starobinsky and alpha-attractor models. The degeneracy can be broken if B-modes are measured also at multipoles l greater than or similar to 900: more precisely experiments like CMB-S4 or CORE-M5 would be able to discriminate PMFs from primordial GWs at high statistical significance. Experiments like LiteBIRD or PIXIE will not be able to break the degeneracy and will need complementary bounds coming, for example, from measurements of anisotropies in the Faraday rotation angle of CMB polarization. This reinforces the importance of future experimental constraints on PMFs.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.6
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

Article Astronomy & Astrophysics

Robust sampling for weak lensing and clustering analyses with the Dark Energy Survey

P. Lemos, N. Weaverdyck, R. P. Rollins, J. Muir, A. Ferte, A. R. Liddle, A. Campos, D. Huterer, M. Raveri, J. Zuntz, E. Di Valentino, X. Fang, W. G. Hartley, M. Aguena, S. Allam, J. Annis, E. Bertin, S. Bocquet, D. Brooks, D. L. Burke, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, F. J. Castander, A. Choi, M. Costanzi, M. Crocce, L. N. da Costa, M. E. S. Pereira, J. P. Dietrich, S. Everett, I Ferrero, J. Frieman, J. Garcia-Bellido, M. Gatti, E. Gaztanaga, D. W. Gerdes, D. Gruen, R. A. Gruendl, J. Gschwend, G. Gutierrez, S. R. Hinton, D. L. Hollowood, K. Honscheid, D. J. James, K. Kuehn, N. Kuropatkin, M. Lima, M. March, P. Melchior, F. Menanteau, R. Miquel, R. Morgan, A. Palmese, F. Paz-Chinchon, A. Pieres, A. A. Plazas Malagon, A. Porredon, E. Sanchez, V Scarpine, M. Schubnell, S. Serrano, I Sevilla-Noarbe, M. Smith, E. Suchyta, M. E. C. Swanson, G. Tarle, D. Thomas, C. To, T. N. Varga, J. Weller

Summary: Recent cosmological analyses have used various algorithms to sample from posterior distributions, but the justification for the choice and settings of the samplers is often lacking. In this study, three samplers were investigated to motivate and validate the algorithm and settings used for the Dark Energy Survey (DES) analyses. The findings showed that polychord provides a good balance of speed and robustness and is recommended for analyses with DES Y3 data.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

Add to Collection
Review Physics, Multidisciplinary

Teleparallel gravity: from theory to cosmology

Sebastian Bahamonde, Konstantinos F. Dialektopoulos, Celia Escamilla-Rivera, Gabriel Farrugia, Viktor Gakis, Martin Hendry, Manuel Hohmann, Jackson Levi Said, Jurgen Mifsud, Eleonora Di Valentino

Summary: In this Review, the development of teleparallel gravity as a gauge theory of translations is comprehensively introduced. The construction of consistent teleparallel theories that respect physical conditions such as local Lorentz invariance is described. Various modified teleparallel theories of gravity are discussed and connected into general classes of covariant gravitational theories. The cosmological consequences and observational implications of teleparallel gravity are also explored, along with the application of machine learning to gravity research.

REPORTS ON PROGRESS IN PHYSICS (2023)

Add to Collection
Article Astronomy & Astrophysics

Quantifying the global 'CMB tension' between the Atacama Cosmology Telescope and the Planck satellite in extended models of cosmology

Eleonora Di Valentino, William Giare, Alessandro Melchiorri, Joseph Silk

Summary: In this study, the global agreement between observations of the cosmic microwave background (CMB) from the Atacama Cosmology Telescope and the Planck satellite is examined in different cosmological models with additional parameters. The Suspiciousness statistic is used to quantify the tension between the two experiments. Results show that the tension is reduced to 1.8 sigma when the effective number of relativistic particles is lower than the standard value, and ranges between 2.3 sigma and 3.5 sigma in other extended models.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

Add to Collection
Article Astronomy & Astrophysics

Towards a reliable calculation of relic radiation from primordial gravitational waves

William Giare, Matteo Forconi, Eleonora Di Valentino, Alessandro Melchiorri

Summary: This paper analyzes the inflationary gravitational waves, which act as additional radiation in the Early Universe and can increase the effective number of relativistic species (N-eff) through a correction based on the integrated energy-density in gravitational waves across all scales. The study demonstrates that the calculation is dominated by the behavior of the tensor spectrum on scales corresponding to modes that cross the horizon very close to the end of inflation, making it strongly model dependent. The researchers use a theoretical Monte Carlo approach within the framework of the Effective Field Theory of inflation to investigate the observable predictions of various models, proving that accurate analyses are necessary to obtain reliable information on the inflationary Universe.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

Add to Collection
Article Astronomy & Astrophysics

Tensor-to-scalar ratio forecasts for extended LiteBIRD frequency configurations

U. Fuskeland, J. Aumont, R. Aurlien, C. Baccigalupi, A. J. Banday, H. K. Eriksen, J. Errard, R. T. Genova-Santos, T. Hasebe, J. Hubmayr, H. Imada, N. Krachmalnicoff, L. Lamagna, G. Pisano, D. Poletti, M. Remazeilles, K. L. Thompson, L. Vacher, I. K. Wehus, S. Azzoni, M. Ballardini, R. B. Barreiro, N. Bartolo, A. Basyrov, D. Beck, M. Bersanelli, M. Bortolami, M. Brilenkov, E. Calabrese, A. Carones, F. J. Casas, K. Cheung, J. Chluba, S. E. Clark, L. Clermont, F. Columbro, A. Coppolecchia, G. D'Alessandro, P. de Bernardis, T. de Haan, E. de la Hoz, M. De Petris, S. Della Torre, P. Diego-Palazuelos, F. Finelli, C. Franceschet, G. Galloni, M. Galloway, M. Gerbino, M. Gervasi, T. Ghigna, S. Giardiello, E. Gjerlow, A. Gruppuso, P. Hargrave, M. Hattori, M. Hazumi, L. T. Hergt, D. Herman, D. Herranz, E. Hivon, T. D. Hoang, K. Kohri, M. Lattanzi, A. T. Lee, C. Leloup, F. Levrier, A. I. Lonappan, G. Luzzi, B. Maffei, E. Martinez-Gonzalez, S. Masi, S. Matarrese, T. Matsumura, M. Migliaccio, L. Montier, G. Morgante, B. Mot, L. Mousset, R. Nagata, T. Namikawa, F. Nati, P. Natoli, S. Nerval, A. Novelli, L. Pagano, A. Paiella, D. Paoletti, G. Pascual-Cisneros, G. Patanchon, V. Pelgrims, F. Piacentini, G. Piccirilli, G. Polenta, G. Puglisi, N. Raffuzzi, A. Ritacco, J. A. Rubino-Martin, G. Savini, D. Scott, Y. Sekimoto, M. Shiraishi, G. Signorelli, S. L. Stever, N. Stutzer, R. M. Sullivan, H. Takakura, L. Terenzi, H. Thommesen, M. Tristram, M. Tsuji, P. Vielva, J. Weller, B. Westbrook, G. Weymann-Despres, E. J. Wollack, M. Zannoni

ASTRONOMY & ASTROPHYSICS (2023)

Add to Collection
Article Astronomy & Astrophysics

Inference of the optical depth to reionization & tau; from Planck CMB maps with convolutional neural networks

Kevin Wolz, Nicoletta Krachmalnicoff, Luca Pagano

Summary: This paper presents a likelihood-free inference of the optical depth to reionization using neural networks, based on polarized Planck HFI maps. The study confirms the potential of NN-based inference as a promising tool for future CMB experiments and highlights the challenges in obtaining accurate constraints on the cosmological parameter.

ASTRONOMY & ASTROPHYSICS (2023)

Add to Collection
Article Astronomy & Astrophysics

Probing Lorentz-violating electrodynamics with CMB polarization

L. Caloni, S. Giardiello, M. Lembo, M. Gerbino, G. Gubitosi, M. Lattanzi, L. Pagano

Summary: We conducted a comprehensive study on the signatures of Lorentz violation in electrodynamics on the Cosmic Microwave Background (CMB) anisotropies. Using the minimal Standard Model Extension (SME) framework, we analyzed the effects generated by renormalizable operators, both CPT-odd and CPT-even. Constraints were placed on the relevant Lorentz-violating parameters using the latest CMB datasets. We obtained improved bounds on CPT-even coefficient and stronger limits on CPT-odd coefficients compared to previous CMB-based limits, providing the strongest constraints to date on CPT-violating coefficients in the minimal SME.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2023)

Add to Collection
Article Astronomy & Astrophysics

Dark Energy Survey Year 3 results: magnification modelling and impact on cosmological constraints from galaxy clustering and galaxy-galaxy lensing

J. Elvin-Poole, N. MacCrann, S. Everett, J. Prat, E. S. Rykoff, J. DeVicente, B. Yanny, K. Herner, A. Ferte, E. DiValentino, A. Choi, D. L. Burke, I. Sevilla-Noarbe, A. Alarcon, O. Alves, A. Amon, F. Andrade-Oliveira, E. Baxter, K. Bechtol, M. R. Becker, G. M. Bernstein, J. Blazek, H. Camacho, A. Campos, A. Carnero Rosell, M. Carrasco Kind, R. Cawthon, C. Chang, R. Chen, J. Cordero, M. Crocce, C. Davis, J. DeRose, H. T. Diehl, S. Dodelson, C. Doux, A. Drlica-Wagner, K. Eckert, T. F. Eifler, F. Elsner, X. Fang, P. Fosalba, O. Friedrich, M. Gatti, G. Giannini, D. Gruen, R. A. Gruendl, I. Harrison, W. G. Hartley, H. Huang, E. M. Huff, D. Huterer, E. Krause, N. Kuropatkin, P. -F. Leget, P. Lemos, A. R. Liddle, J. McCullough, J. Muir, J. Myles, A. Navarro-Alsina, S. Pandey, Y. Park, A. Porredon, M. Raveri, M. Rodriguez-Monroy, R. P. Rollins, A. Roodman, R. Rosenfeld, A. J. Ross, C. Sanchez, J. Sanchez, L. F. Secco, E. Sheldon, T. Shin, M. A. Troxel, I. Tutusaus, T. N. Varga, N. Weaverdyck, R. H. Wechsler, B. Yin, Y. Zhang, J. Zuntz, M. Aguena, S. Avila, D. Bacon, E. Bertin, S. Bocquet, D. Brooks, J. Garcia-Bellido, K. Honscheid, M. Jarvis, T. S. Li, J. Mena-Fernandez, C. To, R. D. Wilkinson

Summary: We investigate the impact of magnification on galaxy clustering and galaxy-galaxy lensing in the Dark Energy Survey Year 3. Two different lens samples are used: luminous red galaxies (redMaGiC) and a sample with a redshift-dependent magnitude limit (MagLim). We account for magnification effects on galaxy selection and find that it significantly affects the MagLim sample. The cosmological constraints from the analysis are consistent with the ΛCDM and wCDM models, but there is a discrepancy in the amplitude when allowing for free magnification bias.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

Add to Collection
Article Astronomy & Astrophysics

Is the Harrison-Zel'dovich spectrum coming back? ACT preference for ns ∼ 1 and its discordance with Planck

William Giare, Fabrizio Renzi, Olga Mena, Eleonora Di Valentino, Alessandro Melchiorri

Summary: The Data Release 4 of the Atacama Cosmology Telescope (ACT) shows an agreement with a Harrison-Zel'dovich primordial spectrum, introducing a tension with the results from the Planck satellite. This discrepancy on the value of the scalar spectral index is not alleviated with the addition of large scale structure information or low multipole polarization data. Possible avenues to alleviate the tension are discussed, including neglecting polarization measurements from ACT or extending different sectors of the theory.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

Add to Collection
Article Astronomy & Astrophysics

A consistent view of interacting dark energy from multiple CMB probes

Yuejia Zhai, William Giare, Carsten van de Bruck, Eleonora Di Valentino, Olga Mena, Rafael C. Nunes

Summary: We analyze a cosmological model with interaction between dark energy and dark matter using data from three independent experiments: Planck, Atacama Cosmology Telescope, and WMAP. Regardless of the combination of datasets, the results consistently support an interacting dark sector with a 95% confidence level. This preference remains consistent when cross-checked with independent probes and yields a value for the expansion rate H0 consistent with local distance ladder measurements.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2023)

Add to Collection
Article Astronomy & Astrophysics

No evidence for EDE from Planck data in extended scenarios

Emanuele Fondi, Alessandro Melchiorri, Luca Pagano

Summary: The latest data release from the ACT CMB experiment and previous WMAP data show evidence for an Early Dark Energy component at more than 3 standard deviations. This conclusion also holds when considering temperature data from the intermediate angular scales of the Planck experiment, but vanishes when the full Planck dataset is considered. However, it has been shown that the full Planck dataset exhibits an anomalous lensing component and a preference for a closed universe at the level of three standard deviations. Investigating if these anomalies could anti-correlate with an early dark energy component is of utmost importance.

JOURNAL OF HIGH ENERGY ASTROPHYSICS (2023)

Add to Collection
Article Astronomy & Astrophysics

Exploring the H0 tension and the evidence for dark sector interactions from 2D BAO measurements

Armando Bernui, Eleonora Di Valentino, William Giare, Suresh Kumar, Rafael C. Nunes

Summary: In this study, we use a compilation of 15 measurements of the 2D baryon acoustic oscillation (BAO) scale and Planck-CMB data to explore a class of interacting dark energy (DE) and dark matter (DM) cosmological models. We find that 2D BAO measurements can provide different observational constraints compared to the traditional 3D BAO measurements. Contrary to previous observations, Planck-CMB + 2D BAO data suggest higher values for the Hubble constant H0. Through joint analysis with additional Gaussian prior on H0, we conclude that the H0 tension is resolved in the interacting DE model with strong statistical evidence (more than 3 sigma).

PHYSICAL REVIEW D (2023)

Add to Collection
Article Astronomy & Astrophysics

Novel model-marginalized cosmological bound on the QCD axion mass

Eleonora Di Valentino, Stefano Gariazzo, William Giare, Alessandro Melchiorri, Olga Mena, Fabrizio Renzi

Summary: We have presented model-marginalized limits on mixed hot dark matter scenarios, incorporating thermal neutrinos and thermal QCD axions. Our analysis included small-scale cosmic microwave background (CMB) observations from the Atacama Cosmology Telescope (ACT) and the South Pole Telescope (SPT), as well as data from the Planck satellite and baryon acoustic oscillation (BAO) measurements. The combination of ACT, Planck, and BAO yielded the tightest 95% Confidential Level (CL) upper bound of 0.21 eV for both P m nu and ma.

PHYSICAL REVIEW D (2023)

Add to Collection
Article Astronomy & Astrophysics

Revealing the effects of curvature on the cosmological models

Weiqiang Yang, William Giare, Supriya Pan, Eleonora Di Valentino, Alessandro Melchiorri, Joseph Silk

Summary: In this study, the effects of introducing curvature in extended cosmologies with a varying neutrino sector and different parametrizations of dark energy are considered. The Planck 2018 data, including cosmic microwave background temperature and polarization data, baryon acoustic oscillations, and Pantheon type Ia supernovae data are utilized. The main finding is that a nonflat Universe cannot be ruled out based on the current astronomical data, as there is evidence for a closed Universe in most of the explored dark energy cosmologies. However, enforcing a flat Universe can significantly bias the constraints on the equation of state of the dark energy component and its dynamical nature.

PHYSICAL REVIEW D (2023)

Add to Collection
Article Astronomy & Astrophysics

Extended analysis of neutrino-dark matter interactions with small-scale CMB experiments

Philippe Brax, Carsten van de Bruck, Eleonora Di Valentino, William Giare, Sebastian Trojanowski

Summary: This study explores the interaction between dark matter and neutrinos by analyzing the Cosmic Microwave Background (CMB) data. The results indicate a non-zero coupling between dark matter and neutrinos and confirm the validity of the model. The interacting vDM (+Neff) scenario is found to be preferred over the baseline ACDM (+Neff) cosmology.

PHYSICS OF THE DARK UNIVERSE (2023)

Add to Collection
No Data Available
Webinars Posters Questions Hubs Funding Journals Papers Connect Collections Reviewers About Us FAQs Mobile App Privacy Policy Terms of Use
© Peeref 2019-2024. All rights reserved.