Explanipedia

Requirements on bandpass resolution and measurement precision for LiteBIRD Open

S. Giardiello, A. Carones, T. Ghigna, L. Pagano, F. Piacentini , et al. · 2025

Systematic effects can hinder the sought-after detection of primordial gravitational waves, impacting the reconstruction of the B -mode polarization signal which they generate in the cosmic microwave background (CMB). In this work, we stud…

On the computational feasibility of Bayesian end-to-end analysis of LiteBIRD simulations within Cosmoglobe Open

R Aurvik, M. Galloway, E. Gjerløw, U Fuskeland, A. Basyrov , et al. · 2025

We assess the computational feasibility of end-to-end Bayesian analysis of the JAXA-led LiteBIRD experiment by analysing simulated time ordered data (TOD) for a subset of detectors through the Cosmoglobe and Commander3 framework. The data …

LiteBIRD science goals and forecasts: constraining isotropic cosmic birefringence Open

E de la Hoz, P. Diego-Palazuelos, Josquin Errard, A. Gruppuso, Baptiste Jost , et al. · 2025

Cosmic birefringence (CB) is the rotation of the photons' linear polarisation plane during propagation. Such an effect is a tracer of parity-violating extensions of standard electromagnetism and would probe the existence of a new cosmologi…

Reconstructing the epoch of reionisation with Planck PR4 Open

S. Ilić, M. Tristram, M. Douspis, Adélie Gorce, S. Henrot–Versillé , et al. · 2025

The epoch of reionisation is a key phase in cosmic history, characterised by the ionisation of the intergalactic medium by the first luminous sources. In this work, we constrain the reionisation history of the Universe using data from the …

Enhancing European Cooperation in the Search for Dark Matter Open

B. Andrieu, T. Behnke, Philip Bechtle, X. Bertou, José Busto , et al. · 2025

The search for dark matter is an exciting topic that is pursued in different communities over a wide range of masses and using a variety of experimental approaches. The result is a strongly correlated matrix of activities across Europe and…

Requirements on the gain calibration for LiteBIRD polarisation data with blind component separation Open

F. Carralot, A. Carones, N. Krachmalnicoff, T. Ghigna, A. Novelli , et al. · 2025

The detection of primordial B modes of the cosmic microwave background (CMB) could provide information about the early stages of the Universe's evolution. The faintness of this signal requires exquisite calibration accuracy and control of …

LiteBIRD science goals and forecasts. Mapping the hot gas in the Universe Open

M. Remazeilles, M. Douspis, J.A. Rubiño-Martín, A. J. Banday, J. Chluba , et al. · 2024

We assess the capabilities of the LiteBIRD mission to map the hot gas distribution in the Universe through the thermal Sunyaev-Zeldovich (SZ) effect. Our analysis relies on comprehensive simulations incorporating various sources of Galacti…

Requirements on the gain calibration for LiteBIRD polarisation data with blind component separation Open

F. Carralot, A. Carones, N Krachmalnicoff, T. Ghigna, Andrea Novelli , et al. · 2024

Future cosmic microwave background (CMB) experiments are primarily targeting a detection of the primordial $B$-mode polarisation. The faintness of this signal requires exquisite control of systematic effects which may bias the measurements…

LiteBIRD science goals and forecasts: primordial magnetic fields Open

D. Paoletti, J. A. Rubiño-Martín, Maresuke Shiraishi, D. Molinari, Jens Chluba , et al. · 2024

We present detailed forecasts for the constraints on the characteristics of primordial magnetic fields (PMFs) generated prior to recombination that will be obtained with the LiteBIRD satellite. The constraints are driven by some of the mai…

Impact of beam far side-lobe knowledge in the presence of foregrounds for LiteBIRD Open

C. Leloup, G. Patanchon, Josquin Errard, C. Franceschet, Jon E. Gudmundsson , et al. · 2024

We present a study of the impact of a beam far side-lobe lack of knowledge on the measurement of the Cosmic Microwave Background B -mode signal at large scale. Beam far side-lobes induce a mismatch in the transfer function of Galactic fore…

LiteBIRD science goals and forecasts: a full-sky measurement of gravitational lensing of the CMB Open

A.I. Lonappan, Toshiya Namikawa, G. Piccirilli, P. Diego-Palazuelos, M. Ruiz-Granda , et al. · 2024

We explore the capability of measuring lensing signals in LiteBIRD full-sky polarization maps. With a 30 arcmin beam width and an impressively low polarization noise of 2.16 μ K-arcmin, LiteBIRD will be able to measure the full-sky polariz…

LiteBIRD science goals and forecasts: improving sensitivity to inflationary gravitational waves with multitracer delensing Open

Toshiya Namikawa, A.I. Lonappan, C. Baccigalupi, N. Bartolo, D. Beck , et al. · 2024

We estimate the efficiency of mitigating the lensing B -mode polarization, the so-called delensing, for the LiteBIRD experiment with multiple external data sets of lensing-mass tracers. The current best bound on the tensor-to-scalar ratio,…

LiteBIRD science goals and forecasts. A case study of the origin of primordial gravitational waves using large-scale CMB polarization Open

P. Campeti, Eiichiro Komatsu, C. Baccigalupi, M. Ballardini, N. Bartolo , et al. · 2024

We study the possibility of using the LiteBIRD satellite B -mode survey to constrain models of inflation producing specific features in CMB angular power spectra. We explore a particular model example, i.e. spectator axion-SU(2) gauge fiel…

Robust constraints on tensor perturbations from cosmological data: a comparative analysis from Bayesian and frequentist perspectives Open

G. Galloni, S. Henrot–Versillé, M. Tristram · 2024

We analyze primordial tensor perturbations using the latest cosmic microwave background and gravitational waves data, focusing on the tensor-to-scalar ratio, $r$, and the tensor spectral tilt, $n_t$. Utilizing data from Planck PR4, BICEP/K…

LiteBIRD Science Goals and Forecasts: Primordial Magnetic Fields Open

D. Paoletti, J. A. Rubiño-Martín, Maresuke Shiraishi, D. Molinari, Jens Chluba , et al. · 2024

We present detailed forecasts for the constraints on primordial magnetic fields (PMFs) that will be obtained with the LiteBIRD satellite. The constraints are driven by the effects of PMFs on the CMB anisotropies: the gravitational effects …

Impact of beam far side-lobe knowledge in the presence of foregrounds for LiteBIRD Open

C. Leloup, G. Patanchon, J. Errard, C. Franceschet, Jon E. Gudmundsson , et al. · 2023

We present a study of the impact of an uncertainty in the beam far side-lobe knowledge on the measurement of the Cosmic Microwave Background $B$-mode signal at large scale. It is expected to be one of the main source of systematic effects …

LiteBIRD Science Goals and Forecasts: Improving Sensitivity to Inflationary Gravitational Waves with Multitracer Delensing Open

Toshiya Namikawa, A.I. Lonappan, C. Baccigalupi, N. Bartolo, D. Beck , et al. · 2023

We estimate the efficiency of mitigating the lensing $B$-mode polarization, the so-called delensing, for the $LiteBIRD$ experiment with multiple external data sets of lensing-mass tracers. The current best bound on the tensor-to-scalar rat…

LiteBIRD Science Goals and Forecasts: A full-sky measurement of gravitational lensing of the CMB Open

A.I. Lonappan, Toshiya Namikawa, G. Piccirilli, P. Diego-Palazuelos, M. Ruiz-Granda , et al. · 2023

We explore the capability of measuring lensing signals in $LiteBIRD$ full-sky polarization maps. With a $30$ arcmin beam width and an impressively low polarization noise of $2.16\,μ$K-arcmin, $LiteBIRD$ will be able to measure the full-sky…

LiteBIRD Science Goals and Forecasts. A Case Study of the Origin of Primordial Gravitational Waves using Large-Scale CMB Polarization Open

P. Campeti, Eiichiro Komatsu, C. Baccigalupi, M. Ballardini, N. Bartolo , et al. · 2023

We study the possibility of using the $LiteBIRD$ satellite $B$-mode survey to constrain models of inflation producing specific features in CMB angular power spectra. We explore a particular model example, i.e. spectator axion-SU(2) gauge f…

Cosmological parameters derived from the final <i>Planck</i> data release (PR4) Open

M. Tristram, A. J. Banday, M. Douspis, X. Garrido, K. M. Górski , et al. · 2023

We present cosmological parameter constraints using maps from the last Planck data release (PR4). In particular, we detail an upgraded version of the cosmic microwave background likelihood, HiLLiPoP , that is based on angular power spectra…

Cosmological parameters derived from the final (PR4) Planck data release Open

M. Tristram, A. J. Banday, M. Douspis, X. Garrido, K. M. Górski , et al. · 2023

We present constraints on cosmological parameters using maps from the last Planck data release (PR4). In particular, we detail an upgraded version of the cosmic microwave background likelihood, HiLLiPoP, based on angular power spectra and …

MSSM-inflation revisited: Towards a coherent description of high-energy physics and cosmology Open

G. Weymann-Despres, S. Henrot–Versillé, G. Moultaka, Vincent Vennin, L. Duflot , et al. · 2023

International audience

MSSM inflation revisited: Toward a coherent description of high-energy physics and cosmology Open

G. Weymann-Despres, S. Henrot–Versillé, G. Moultaka, Vincent Vennin, L. Duflot , et al. · 2023

The aim of this paper is to highlight the challenges and potential gains surrounding a coherent description of physics from the high-energy scales of inflation down to the lower energy scales probed in particle-physics experiments. As an e…

MSSM-inflation revisited: Towards a coherent description of high-energy physics and cosmology Open

G. Weymann-Despres, S. Henrot–Versillé, G. Moultaka, Vincent Vennin, L. Duflot , et al. · 2023

The aim of this paper is to highlight the challenges and potential gains surrounding a coherent description of physics from the high-energy scales of inflation down to the lower energy scales probed in particle-physics experiments. As an e…

Polarization angle requirements for CMB B-mode experiments. Application to the LiteBIRD satellite Open

P. Vielva, E. Martínez-González, F. J. Casas, T. Matsumura, S. Henrot–Versillé , et al. · 2023

A methodology to provide the polarization angle requirements for different\nsets of detectors, at a given frequency of a CMB polarization experiment, is\npresented. The uncertainties in the polarization angle of each detector set are\nrela…

Probing Cosmic Inflation with the LiteBIRD Cosmic Microwave Background Polarization Survey Open

Erwan Allys, Kam Arnold, J. Aumont, S. Azzoni, C. Baccigalupi , et al. · 2023

LiteBIRD the Lite (Light) satellite for the study of B-mode polarization and Inflation from cosmic background Radiation Detection, is a space mission for primordial cos- mology and fundamental physics. The Japan Aerospace Exploration Agenc…

(Some) Polarisation Aspects of the Cosmic Microwave Background Open

S. Henrot–Versillé · 2022

Probing cosmic inflation with the<i>LiteBIRD</i>cosmic microwave background polarization survey Open

Erwan Allys, Kam Arnold, J. Aumont, R. Aurlien, S. Azzoni , et al. · 2022

LiteBIRD, the Lite (Light) satellite for the study of B-mode polarization and Inflation from cosmic background Radiation Detection, is a space mission for primordial cosmology and fundamental physics. The Japan Aerospace Exploration Agency…

QUBIC Experiment Toward the First Light Open

G. D’Alessandro, E. S. Battistelli, P. de Bernardis, M. De Petris, M.M. Gamboa Lerena , et al. · 2022

QUBIC II: Spectral polarimetry with bolometric interferometry Open

L. Mousset, M.M. Gamboa Lerena, E. S. Battistelli, P. de Bernardis, P. Chanial , et al. · 2022

Bolometric interferometry is a novel technique that has the ability to perform spectral imaging. A bolometric interferometer observes the sky in a wide frequency band and can reconstruct sky maps in several sub-bands within the physical ba…

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