Explanipedia

A simulation framework for the <i>LiteBIRD</i> instruments Open

M Tomasi, L. Pagano, Anil C. Anand, C Baccigalupi, A. J. Banday , et al. · 2025

LiteBIRD , the Lite (Light) satellite for the study of B-mode polarization and Inflation from cosmic background Radiation Detection, is a space mission focused on primordial cosmology and fundamental physics. In this paper, we present the …

LiteBIRD science goals and forecasts: improved full-sky reconstruction of the gravitational lensing potential through the combination of Planck and LiteBIRD data Open

M. Ruiz-Granda, P. Diego-Palazuelos, C. Gimeno-Amo, P. Vielva, A.I. Lonappan , et al. · 2025

Cosmic microwave background (CMB) photons are deflected by large-scale structure through gravitational lensing. This secondary effect introduces higher-order correlations in CMB anisotropies, which are used to reconstruct lensing deflectio…

Variance of dust temperature and spectral index in Planck polarization data using spin-moment expansion Open

V. Guillet, L. Vacher, J. Aumont, F. Boulanger, A. Ritacco , et al. · 2025

Thermal dust is the major polarized foreground hindering the detection of primordial CMB B-modes. Its signal presents a complex behavior in frequency space inherited from the joint variation in our Galaxy of the orientation of magnetic fie…

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…

LiteBIRD Science Goals and Forecasts. $E$-mode Anomalies Open

A. J. Banday, C. Gimeno-Amo, P. Diego-Palazuelos, E de la Hoz, A. Gruppuso , et al. · 2025

Various so-called anomalies have been found in both the WMAP and Planck cosmic microwave background (CMB) temperature data that exert a mild tension against the highly successful best-fit 6 parameter cosmological model, potentially providi…

First release of LiteBIRD simulations from an end-to-end pipeline Open

M. Bortolami, N. Raffuzzi, L. Pagano, Giuseppe Puglisi, Ashish Anand , et al. · 2025

The LiteBIRD satellite mission aims at detecting Cosmic Microwave Background $B$ modes with unprecedented precision, targeting a total error on the tensor-to-scalar ratio $r$ of $δr \sim 0.001$. Operating from the L2 Lagrangian point of th…

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…

How bad could it be? Modelling the 3D complexity of the polarised dust signal using moment expansion Open

L. Vacher, A. Carones, J. Aumont, Jens Chluba, N. Krachmalnicoff , et al. · 2025

The variation of the physical conditions across the three dimensions of our Galaxy is a major source of complexity for the modelling of the foreground signal facing the cosmic microwave background (CMB). In the present work, we demonstrate…

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…

Multi-dimensional optimisation of the scanning strategy for the LiteBIRD space mission Open

Y. Takase, L. Vacher, H. Ishino, G. Patanchon, L. Montier , et al. · 2024

Large angular scale surveys in the absence of atmosphere are essential for measuring the primordial B-mode power spectrum of the Cosmic Microwave Background (CMB). Since this proposed measurement is about three to four orders of magnitude …

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…

Absolute Reference for Microwave Polarization Experiments. The COSMOCal Project and its Proof of Concept Open

A. Ritacco, L. Bizzarri, S. Savorgnano, F. Boulanger, M. Pérault , et al. · 2024

Context. The cosmic microwave background (CMB), a remnant of the Big Bang, provides unparalleled insights into the primordial universe, its energy content, and the origin of cosmic structures. The success of forthcoming terrestrial and spa…

Generative models of astrophysical fields with scattering transforms on the sphere Open

L. Mousset, Erwan Allys, Matt A. Price, J. Aumont, J.‐M. Delouis , et al. · 2024

Scattering transforms are a new type of summary statistics recently developed for the study of highly non-Gaussian processes, which have been shown to be very promising for astrophysical studies. In particular, they allow one to build gene…

The LiteBIRD mission to explore cosmic inflation Open

T. Ghigna, Alexander Adler, Kosuke Aizawa, Hiroki Akamatsu, Ryosuke Akizawa , et al. · 2024

LiteBIRD, the next-generation cosmic microwave background (CMB) experiment, aims for a launch in Japan's fiscal year 2032, marking a major advancement in the exploration of primordial cosmology and fundamental physics. Orbiting the Sun-Ear…

LiteBIRD Science Goals and Forecasts. Mapping the Hot Gas in the Universe Open

M. Remazeilles, M. Douspis, J. A. Rubiño-Martín, A. J. Banday, Jens 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…

Scattering transforms on the sphere, application to large scale structure modelling Open

L. Mousset, Erwan Allys, Matt A. Price, J. Aumont, J.‐M. Delouis , et al. · 2024

Scattering transforms are a new type of summary statistics recently developed for the study of highly non-Gaussian processes, which have been shown to be very promising for astrophysical studies. In particular, they allow one to build gene…

Generative models of astrophysical fields with scattering transforms on the sphere Open

L. Mousset, Erwan Allys, Matt A. Price, J. Aumont, J.‐M. Delouis , et al. · 2024

Scattering transforms are a new type of summary statistics recently developed for the study of highly non-Gaussian processes, which have been shown to be very promising for astrophysical studies. In particular, they allow one to build gene…

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…

Absolute reference for microwave polarization experiments -- The COSMOCal project and its proof of concept Open

A. Ritacco, L. Bizzarri, S. Savorgnano, F. Boulanger, M. Pérault , et al. · 2024

The cosmic microwave background (CMB), a remnant of the Big Bang, provides unparalleled insights into the primordial universe, its energy content, and the origin of cosmic structures. The success of forthcoming terrestrial and space experi…

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 …

Measuring the CMB primordial B-modes with Bolometric Interferometry Open

A. Mennella, P. A. R. Ade, A. Almela, G. Amico, L.H. Arnaldi , et al. · 2024

The Q&U Bolometric Interferometer for Cosmology (QL’BIC) is the first bolometric interferometer designed to measure the primordial B -mode polarization of the Cosmic Microwave Background (CMB). Bolometric interferometry is a novel techniqu…

Polarization angle accuracy for future CMB experiments Open

A. Ritacco, L. Bizzarri, F. Boulanger, M. Pérault, J. Aumont , et al. · 2024

The Cosmic Microwave Background (CMB) radiation offers a unique window into the early Universe, facilitating precise examinations of fundamental cosmological theories. However, the quest for detecting B -modes in the CMB, predicted by theo…

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…

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