Article
Astronomy & Astrophysics
Thomas Floss, Tim de Wild, P. Daniel Meerburg, Leon V. E. Koopmans
Summary: In this study, we investigate the possibility of using tomography of 21-cm brightness temperature fluctuations during the Dark Ages as a means to constrain primordial non-Gaussianity. We improve previous models by including the effect of the free electron fraction and derive the secondary bispectrum as well as the secondary trispectrum of 21-cm brightness temperature fluctuations. We find that although secondary non-Gaussianity dominates the signal, primordial non-Gaussianity can still be extracted with significantly higher signal-to-noise ratios than current and future CMB experiments.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Wei Cheng, Xuewen Liu, Ruiyu Zhou
Summary: This paper studies the cosmological inflation and dark matter within a Z3 complex scalar model and finds that the mixing angle, DM mass, and Higgs-like scalar mass are constrained in the low-energy scale. It also suggests that measuring the tensor-to-scalar ratio with higher precision can distinguish between the two forms of inflation in the high-energy scale.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Daniel Baumann, Daniel Green
Summary: This paper discusses the impact of nonlinear structure formation on the study of primordial non-Gaussianity and proposes a method to measure non-Gaussianity in the position space maps of the large-scale structure. The study shows that map-level analysis can significantly improve the constraining power over non-Gaussianity.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Shuntaro Aoki
Summary: We investigate the impact of a massive field with a continuous spectrum on the inflationary bispectrum in the squeezed limit. Using an extended quasi-single field inflation model with a well-motivated spectral density from extra dimensions, we focus on a contribution to the bispectrum involving a single continuum isocurvaton exchange. In contrast to the usual case without a continuous spectrum, the bispectrum amplitude shows a damping feature in the deep squeezed limit, providing strong evidence for the presence of a continuous spectrum.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Suvedha Suresh Naik, Kazuyuki Furuuchi, Pravabati Chingangbam
Summary: This paper analyzes a class of inflationary models involving particle productions and compares their predictions with the CMB data from Planck 2018. It is found that the multi-bump model with multiple bursts of particle production provides a better fit to the data compared to the concordance ACDM model.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Alba Kalaja, P. Daniel Meerburg, Guilherme L. Pimentel, William R. Coulton
Summary: The study investigates the cosmic variance limit on constraining primordial non-Gaussianity for various theory-motivated shapes. It identifies that the scale-invariant N-point correlator's signal-to-noise does not scale as naively expected with the square root of observed modes due to factors such as blurring of the last scattering surface and behavior in squeezed and collapsed limits. Analytical estimates and numerical calculations confirm these findings, and the addition of polarization data enhances scaling for certain spectra.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Lucas Pinol
Summary: This article explores linear dynamics and cubic interactions for N-field scalar fields during inflation, using observable curvature perturbations and entropic fluctuations. It reveals rich geometrical effects beyond scalar curvature, particularly when the field space dimension is larger than two. The article also highlights potential instability in background dynamics when N-field is greater than or equal to 3, due to negative eigenvalues in the entropic mass matrix from fast rotation of local entropic basis.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Abineet Parichha, Shiv Sethi
Summary: This study proposes a decaying WIMP model that can address the issues with the CDM model at small scales. By comparing the predictions of this model with CMB and galaxy clustering data, the effectiveness of the model is demonstrated and constraints on certain parameters are obtained.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Matteo Biagetti, Alex Cole, Gary Shiu
Summary: The study presents an analysis pipeline utilizing persistent homology to characterize the topology of large scale structure and extract cosmological constraints. By examining the impact of primordial local non-Gaussianity on dark matter halo distribution through N-body simulations, they detected non-zero f(NL)(loc) on multiple cubic volumes. The method effectively addresses degeneracies between different topological signatures and provides interpretable statistics for both reproducing previous results and making new predictions.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Alexandros Karam, Eemeli Tomberg, Hardi Veermae
Summary: The study investigates preheating in the Palatini formalism with a quadratic inflaton potential and an additional alpha R-2 term, identifying tachyonic preheating when alpha is greater than or similar to 10^13 and showing that the energy density of the fragmented field grows with a specific rate. The model expands the range of plateau models with similar preheating behavior, suggesting that non-canonical quartic kinetic terms in the Einstein frame can be neglected in the first approximation during preheating and inflation.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Azadeh Moradinezhad Dizgah, Matteo Biagetti, Emiliano Sefusatti, Vincent Desjacques, Jorge Norena
Summary: Upcoming galaxy redshift surveys are expected to improve limits on primordial non-Gaussianity (PNG) through measurements in Fourier space. A Monte-Carlo Markov Chain analysis was performed to confront perturbation theory predictions with N-body simulations, focusing on the local model of PNG parameterized by f(NL). Informative priors on the linear non-Gaussian bias parameter can significantly improve constraints on f(NL) in statistical inference.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Amjad Ashoorioon, Ghazal Geshnizjani, Hyung J. Kim
Summary: In this paper, we study the validity and non-Gaussianity of Extended Effective Field Theory of Inflation (EEFToI) with initial conditions set with dispersion relations omega(2) a k(6). By computing the bispectrum and investigating the shape of triangles, we find interesting regions of parameter space where EEFToI with these initial conditions is sensible.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Oleg Lebedev
Summary: Stable scalars can be abundantly produced in the Early Universe even without coupling to other fields. The production and mass scale of these scalars during and after (high scale) inflation are studied, leading to strong constraints. Quantum gravity-induced Planck-suppressed operators significantly affect the abundance of dark matter relics, often resulting in overproduction unless the corresponding Wilson coefficients are very small. The uncontrollable nature of these effects without a quantum gravity theory questions the predictability of many non-thermal dark matter models and has potential implications for string theory constructions with abundant scalar fields.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Yang Bai, Daniel Stolarski
Summary: The mechanism proposed in the article allows for obtaining multiple inflection points for the inflaton potential based on the zeros of the inflaton quartic coupling beta function and a sign change of the gauge coupling beta function. A universal inflaton potential is presented that can accommodate observational data and may be tested by upcoming cosmic microwave background observations.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Nina K. Stein, William H. Kinney
Summary: We have constructed a family of simple single-field inflation models that are consistent with Planck/BICEP Keck bounds. These models have a small tensor amplitude and no running of the scalar spectral index. The construction involves a constant-roll hilltop inflaton potential, with the end of inflation being a free parameter induced by dominant higher-order operators. This construction directly demonstrates that there is no lower bound on the tensor/scalar ratio for simple single-field inflation models.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Anirban Roy, Girish Kulkarni, P. Daniel Meerburg, Anthony Challinor, Carlo Baccigalupi, Andrea Lapi, Martin G. Haehnelt
Summary: This study revises estimates of the B-mode signal induced by reionization by incorporating recent observations and simulations, finding that the secondary signal from reionization may not significantly impact current planned CMB experiments in the search for primordial gravitational waves.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Benjamin Beringue, P. Daniel Meerburg, Joel Meyers, Nicholas Battaglia
Summary: The cosmic microwave background (CMB) is a valuable resource for cosmology. Measuring Rayleigh scattering signal can significantly enhance the constraint on cosmological parameters.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Alba Kalaja, P. Daniel Meerburg, Guilherme L. Pimentel, William R. Coulton
Summary: The study investigates the cosmic variance limit on constraining primordial non-Gaussianity for various theory-motivated shapes. It identifies that the scale-invariant N-point correlator's signal-to-noise does not scale as naively expected with the square root of observed modes due to factors such as blurring of the last scattering surface and behavior in squeezed and collapsed limits. Analytical estimates and numerical calculations confirm these findings, and the addition of polarization data enhances scaling for certain spectra.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Maximilian H. Abitbol, David Alonso, Sara M. Simon, Jack Lashner, Kevin T. Crowley, Aamir M. Ali, Susanna Azzoni, Carlo Baccigalupi, Darcy Barron, Michael L. Brown, Erminia Calabrese, Julien Carron, Yuji Chinone, Jens Chluba, Gabriele Coppi, Kevin D. Crowley, Mark Devlin, Jo Dunkley, Josquin Errard, Valentina Fanfani, Nicholas Galitzki, Martina Gerbino, J. Colin Hill, Bradley R. Johnson, Baptiste Jost, Brian Keating, Nicoletta Krachmalnicoff, Akito Kusaka, Adrian T. Lee, Thibaut Louis, Mathew S. Madhavacheril, Heather McCarrick, Jeffrey McMahon, P. Daniel Meerburg, Federico Nati, Haruki Nishino, Lyman A. Page, Davide Poletti, Giuseppe Puglisi, Michael J. Randall, Aditya Rotti, Jacob Spisak, Aritoki Suzuki, Grant P. Teply, Clara Verges, Edward J. Wollack, Zhilei Xu, Mario Zannoni
Summary: The calibration requirements for next-generation ground-based observatories targeting the large-angle B-mode polarization of the Cosmic Microwave Background were quantified, focusing on the Simons Observatory (SO). Results showed that knowing gain calibration and bandpass center frequencies to percent levels or less is crucial to avoid biases on the tensor-to-scalar ratio r. Additionally, a few tenths of a degree calibration for polarization angles and knowledge of their frequency variation between the band edges is essential for accurate measurements. These strict calibration requirements do not significantly degrade the final constraints on r.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Kevork Abazajian, Graeme E. Addison, Peter Adshead, Zeeshan Ahmed, Daniel Akerib, Aamir Ali, Steven W. Allen, David Alonso, Marcelo Alvarez, Mustafa A. Amin, Adam Anderson, Kam S. Arnold, Peter Ashton, Carlo Baccigalupi, Debbie Bard, Denis Barkats, Darcy Barron, Peter S. Barry, James G. Bartlett, Ritoban Basu Thakur, Nicholas Battaglia, Rachel Bean, Chris Bebek, Amy N. Bender, Bradford A. Benson, Federico Bianchini, Colin A. Bischoff, Lindsey Bleem, James J. Bock, Sebastian Bocquet, Kimberly K. Boddy, J. Richard Bond, Julian Borrill, Francois R. Bouchet, Thejs Brinckmann, Michael L. Brown, Sean Bryan, Victor Buza, Karen Byrum, Carlos Hervias Caimapo, Erminia Calabrese, Victoria Calafut, Robert Caldwell, John E. Carlstrom, Julien Carron, Thomas Cecil, Anthony Challinor, Clarence L. Chang, Yuji Chinone, Hsiao-Mei Sherry Cho, Asantha Cooray, Will Coulton, Thomas M. Crawford, Abigail Crites, Ari Cukierman, Francis-Yan Cyr-Racine, Tijmen de Haan, Jacques Delabrouille, Mark Devlin, Eleonora Di Valentino, Marion Dierickx, Matt Dobbs, Shannon Duff, Cora Dvorkin, Joseph Eimer, Tucker Elleflot, Josquin Errard, Thomas Essinger-Hileman, Giulio Fabbian, Chang Feng, Simone Ferraro, Jeffrey P. Filippini, Raphael Flauger, Brenna Flaugher, Aurelien A. Fraisse, Andrei Frolov, Nicholas Galitzki, Patricio A. Gallardo, Silvia Galli, Ken Ganga, Martina Gerbino, Vera Gluscevic, Neil Goeckner-Wald, Daniel Green, Daniel Grin, Evan Grohs, Riccardo Gualtieri, Jon E. Gudmundsson, Ian Gullett, Nikhel Gupta, Salman Habib, Mark Halpern, Nils W. Halverson, Shaul Hanany, Kathleen Harrington, Masaya Hasegawa, Matthew Hasselfield, Masashi Hazumi, Katrin Heitmann, Shawn Henderson, Brandon Hensley, Charles Hill, J. Colin Hill, Renee Hlozek, Shuay-Pwu Patty Ho, Thuong Hoang, Gil Holder, William Holzapfel, John Hood, Johannes Hubmayr, Kevin M. Huffenberger, Howard Hui, Kent Irwin, Oliver Jeong, Bradley R. Johnson, William C. Jones, Jae Hwan Kang, Kirit S. Karkare, Nobuhiko Katayama, Reijo Keskitalo, Theodore Kisner, Lloyd Knox, Brian J. Koopman, Arthur Kosowsky, John Kovac, Ely D. Kovetz, Steve Kuhlmann, Chao-lin Kuo, Akito Kusaka, Anne Lahteenmaki, Charles R. Lawrence, Adrian T. Lee, Antony Lewis, Dale Li, Eric Linder, Marilena Loverde, Amy Lowitz, Phil Lubin, Mathew S. Madhavacheril, Adam Mantz, Gabriela Marques, Frederick Matsuda, Philip Mauskopf, Heather McCarrick, Jeffrey McMahon, P. Daniel Meerburg, Jean-Baptiste Melin, Felipe Menanteau, Joel Meyers, Marius Millea, Joseph Mohr, Lorenzo Moncelsi, Maria Monzani, Tony Mroczkowski, Suvodip Mukherjee, Johanna Nagy, Toshiya Namikawa, Federico Nati, Tyler Natoli, Laura Newburgh, Michael D. Niemack, Haruki Nishino, Brian Nord, Valentine Novosad, Roger O'Brient, Stephen Padin, Steven Palladino, Bruce Partridge, Don Petravick, Elena Pierpaoli, Levon Pogosian, Karthik Prabhu, Clement Pryke, Giuseppe Puglisi, Benjamin Racine, Alexandra Rahlin, Mayuri Sathyanarayana Rao, Marco Raveri, Christian L. Reichardt, Mathieu Remazeilles, Graca Rocha, Natalie A. Roe, Anirban Roy, John E. Ruhl, Maria Salatino, Benjamin Saliwanchik, Emmanuel Schaan, Alessandro Schillaci, Benjamin Schmitt, Marcel M. Schmittfull, Douglas Scott, Neelima Sehgal, Sarah Shandera, Blake D. Sherwin, Erik Shirokoff, Sara M. Simon, Anze Slosar, David Spergel, Tyler St Germaine, Suzanne T. Staggs, Antony Stark, Glenn D. Starkman, Radek Stompor, Chris Stoughton, Aritoki Suzuki, Osamu Tajima, Grant P. Teply, Keith Thompson, Ben Thorne, Peter Timbie, Maurizio Tomasi, Matthieu Tristram, Gregory Tucker, Caterina Umilta, Alexander van Engelen, Eve M. Vavagiakis, Joaquin D. Vieira, Abigail G. Vieregg, Kasey Wagoner, Benjamin Wallisch, Gensheng Wang, Scott Watson, Ben Westbrook, Nathan Whitehorn, Edward J. Wollack, W. L. Kimmy Wu, Zhilei Xu, H. Y. Eric Yang, Siavash Yasini, Volodymyr G. Yefremenko, Ki Won Yoon, Edward Young, Cyndia Yu, Andrea Zonca
Summary: CMB-S4 is the next-generation ground-based cosmic microwave background (CMB) experiment, designed to improve the sensitivity of CMB measurements and enhance our understanding of the origin and evolution of the universe. This study presents a forecasting framework that uses a power-spectrum-based semianalytic projection tool to optimize constraints on the tensor-to-scalar ratio. The framework is unique in its use of information from current CMB experiments to predict the effectiveness of future CMB-polarization endeavors. The study also includes map-based validation studies, allowing for additional complexity and independent verification of the forecasts.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Giorgio Orlando, P. Daniel Meerburg, Subodh P. Patil
Summary: This paper investigates the cross-correlations between cosmic microwave background (CMB) temperature and polarization anisotropies and mu-spectral distortions, aiming to measure (squeezed) primordial scalar bispectra on scales that are not accessible through primary CMB bispectra. The study finds that only primordial tensor bispectra with statistical anisotropies produce distinct signatures, while isotropic tensor bispectra either produce vanishing or highly suppressed signatures. The authors discuss the angular dependence of squeezed bispectra in relation to short and long momenta, as well as the effects of parity transformations on the non-zero cross-correlations. Fisher forecasts are made using the BipoSH formalism to assess the detection prospects from cross-correlations between mu T, mu E, and mu B. The study concludes that observing statistical anisotropies in squeezed bispectra will be challenging due to the subdominance of tensor perturbations on mu-distortions compared to scalar perturbations.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
J. Cumner, E. de Lera Acedo, D. I. L. de Villiers, D. Anstey, C. Kolitsidas, B. Gurdon, N. Fagnoni, P. Alexander, G. Bernardi, H. T. J. Bevins, S. Carey, J. Cavillot, R. Chiello, C. Craeye, W. Croukamp, J. A. Ely, A. Fialkov, T. Gessey-Jones, Q. Gueuning, W. Handley, R. Hills, A. T. Josaitis, G. Kulkarni, A. Magro, R. Maiolino, P. D. Meerburg, S. Mittal, J. R. Pritchard, E. Puchwein, N. Razavi-Ghods, I. L. Roque, A. Saxena, K. H. Scheutwinkel, E. Shen, P. H. Sims, O. Smirnov, M. Spinelli, K. Zarb-Adami
Summary: This paper discusses the design process of global 21 cm experiments, focusing on the REACH experiment, which aims to analyze cosmic hydrogen using detailed modeling and instrumentation characterization to understand and compensate for systematic errors, improving critical calibration process during observation.
JOURNAL OF ASTRONOMICAL INSTRUMENTATION
(2022)
Article
Astronomy & Astrophysics
Thomas Floss, Tim de Wild, P. Daniel Meerburg, Leon V. E. Koopmans
Summary: In this study, we investigate the possibility of using tomography of 21-cm brightness temperature fluctuations during the Dark Ages as a means to constrain primordial non-Gaussianity. We improve previous models by including the effect of the free electron fraction and derive the secondary bispectrum as well as the secondary trispectrum of 21-cm brightness temperature fluctuations. We find that although secondary non-Gaussianity dominates the signal, primordial non-Gaussianity can still be extracted with significantly higher signal-to-noise ratios than current and future CMB experiments.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
E. de Lera Acedo, D. I. L. de Villiers, N. Razavi-Ghods, W. Handley, A. Fialkov, A. Magro, D. Anstey, H. T. J. Bevins, R. Chiello, J. Cumner, A. T. Josaitis, I. L. Roque, P. H. Sims, K. H. Scheutwinkel, P. Alexander, G. Bernardi, S. Carey, J. Cavillot, W. Croukamp, J. A. Ely, T. Gessey-Jones, Q. Gueuning, R. Hills, G. Kulkarni, R. Maiolino, P. D. Meerburg, S. Mittal, J. R. Pritchard, E. Puchwein, A. Saxena, E. Shen, O. Smirnov, M. Spinelli, K. Zarb-Adami
Summary: Observations of the 21-cm line provide valuable insight into the early epochs of the Universe. The EDGES experiment in 2018 detected a potential absorption feature, deeper than expected, but its reliability was questioned. The REACH experiment aims to improve current observations by jointly analyzing systematic effects, foreground emission, and the cosmological signal.
Article
Astronomy & Astrophysics
Marcus Merryfield, Shriharsh P. Tendulkar, Kaitlyn Shin, Bridget Andersen, Alexander Josephy, Deborah Good, Fengqiu Adam Dong, Kiyoshi W. Masui, Dustin Lang, Moritz Muenchmeyer, Charanjot Brar, Tomas Cassanelli, Matt Dobbs, Emmanuel Fonseca, Victoria M. Kaspi, Juan Mena-Parra, Ziggy Pleunis, Masoud Rafiei-Ravandi, Ketan R. Sand, Paul Scholz, Kendrick Smith, Ingrid H. Stairs
Summary: This paper introduces an injection system that can correct for selection effects in dedicated surveys searching for fast radio bursts (FRBs). The system injects a synthetic population of FRBs into the real-time search pipeline to map burst properties onto signal-to-noise ratio (S/N). The study found that the correlation between fluence and S/N for the injected FRBs was consistent with the detections in the CHIME/FRB catalog, and suggested retraining machine-learning based Radio Frequency Interference mitigation methods to increase sensitivity to wide events.
ASTRONOMICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Anchal Saxena, P. Daniel Meerburg, Eloy de Lera Acedo, Will Handley, Leon V. E. Koopmans
Summary: In this paper, the authors construct foreground and 21-cm signal models using modes of variation obtained from simulated data. They propose a strategy to reduce the overlap between the foreground and 21-cm modes by simultaneously fitting spectra from multiple antennas. The results show that this approach improves the accuracy of 21-cm signal extraction and reduces bias and uncertainty.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Thomas Floess, Matteo Biagetti, P. Daniel Meerburg
Summary: In the pursuit of primordial non-Gaussianities, it is important to access smaller scales across larger volumes. However, the search for primordial non-Gaussianities at low redshift is hindered by gravitational collapse. Neglecting off-diagonal components in the covariance degrades forecast constraints on primordial non-Gaussianity, even in the linear regime. Simulation results confirm that non-Gaussian covariance severely limits prospects to constrain primordial non-Gaussianity from the bispectrum in future surveys.
Article
Astronomy & Astrophysics
Utkarsh Giri, Moritz Muenchmeyer, Kendrick M. Smith
Summary: When neural networks are used as a black box, they are not robust to baryonic uncertainty in the nonlinear matter distribution of the universe. To address this issue, we propose a robust architecture for constraining primordial non-Gaussianity fNL by training a neural network to estimate local values and correlating them with the large-scale density field. This method has shown to be 3.5 times better than the standard halo-based approach in N-body simulations.
Article
Astronomy & Astrophysics
Toshiya Namikawa, Anton Baleato Lizancos, Naomi Robertson, Blake D. Sherwin, Anthony Challinor, David Alonso, Susanna Azzoni, Carlo Baccigalupi, Erminia Calabrese, Julien Carron, Yuji Chinone, Jens Chluba, Gabriele Coppi, Josquin Errard, Giulio Fabbian, Simone Ferraro, Alba Kalaja, Antony Lewis, Mathew S. Madhavacheril, P. Daniel Meerburg, Joel Meyers, Federico Nati, Giorgio Orlando, Davide Poletti, Giuseppe Puglisi, Mathieu Remazeilles, Neelima Sehgal, Osamu Tajima, Grant Teply, Alexander van Engelen, Edward J. Wollack, Zhilei Xu, Byeonghee Yu, Ningfeng Zhu, Andrea Zonca
Summary: This study introduces and validates a delensing framework for the Simons Observatory to improve constraints on inflationary gravitational waves. The framework combines internal CMB lensing maps with maps of cosmic infrared background and galaxy density maps for better constraints. Testing on simulations shows that the delensing performance is minimally impacted by survey noise, and the constraints on the tensor-to-scalar ratio are improved significantly.
Article
Astronomy & Astrophysics
Omar Darwish, Simon Foreman, Muntazir M. Abidi, Tobias Baldauf, Blake D. Sherwin, Daniel P. Meerburg
Summary: Large-scale Fourier modes of the cosmic density field are valuable for cosmology, but limited by cosmic variance. Reconstructing large-scale modes using correlations between smaller-scale modes of an observed tracer can improve constraints on parameters. Including reconstructed modes alongside directly observed tracer density modes can enhance constraints on local primordial non-Gaussianity.