Article
Astronomy & Astrophysics
Naonori S. Sugiyama, Shun Saito, Florian Beutler, Hee-Jong Seo
Summary: This study establishes a practical method for the joint analysis of anisotropic galaxy two- and three-point correlation functions and demonstrates the benefits of the anisotropic 3PCF. The analysis focuses on scales above 80 h(-1) Mpc and provides constraints on the angular diameter distance and the Hubble parameter. The study shows that the anisotropic 3PCF increases cosmological information from galaxy surveys, improving parameter constraints compared to 2PCF analysis alone.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Aditya Rotti, Andrea Ravenni, Jens Chluba
Summary: In this study, we conducted a rigorous search for mu-distortion anisotropies using Planck data, applying the well-tested constrained MC component-separation method combined with the needlet framework. We were able to improve the previously estimated constraints on the amplitude of the local form bispectrum by more than an order of magnitude by correlating the reconstructed mu map with the CMB anisotropies and carefully controlling biases and systematic effects in the analysis. We also incorporated constraints from measurements of mu E correlations for the first time, further tightening the limits. These constraints have important implications for multifield inflation models and primordial black hole formation scenarios.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Josue Motoa-Manzano, J. Bayron Orjuela-Quintana, Thiago S. Pereira, Cesar A. Valenzuela-Toledo
Summary: This paper investigates a triad of inhomogeneous scalar fields, known as solid, as a source of homogeneous but anisotropic dark energy. The study finds that anisotropic accelerated solutions can be realized as attractor points for suitable choices of model parameters. Numerical solutions show that the model can describe significant spatial shear within observational bounds, even when set to zero at early times, and a particular region in the model's parameter space where the Universe isotropizes is identified.
PHYSICS OF THE DARK UNIVERSE
(2021)
Article
Astronomy & Astrophysics
Shang Li, Ji-Ping Dai, Xiu-Hui Tan, Yang-Jie Yan, Jun-Qing Xia
Summary: The bounce scenario in cosmology is a research topic that addresses the singularity problem and trans-Planckian issue left by the standard inflationary theory. In this work, the authors extend the analysis to large-scale structure measurements and find that the model parameters can be constrained effectively. The constraints become even stronger when combined with the measurements from the Planck satellite.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Alexandra Dupuy, Noam Libeskind, Yehuda Hoffman, Helene M. Courtois, Stefan Gottlober, Robert J. J. Grand, Alexander Knebe, Jenny G. Sorce, Elmo Tempel, R. Brent Tully, Mark Vogelsberger, Peng Wang
Summary: This study explores the mass assembly in the Local Group and its relation to the cosmic web. The research finds that the accretion direction of satellite materials is related to the cosmic web, and satellites can travel a certain distance before crossing their parent halo.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Physics, Multidisciplinary
Y. Sobhanbabu, M. Vijaya Santhi
Summary: This study examines the dark energy phenomenon by studying the New Agegraphic Dark Energy (NADE) and Dark Matter (DM) within the framework of Brans-Dicke scalar tensor theory of gravitation. The viable deceleration parameter and cosmological parameters are considered to investigate the physical debate and stability of the models. Graphical presentations are used for analysis.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Astronomy & Astrophysics
Shogo Masaki, Takahiro Nishimichi, Masahiro Takada
Summary: This paper investigates the effects of pre-initial conditions on cosmological N-body simulations, revealing artificial features in grid pre-IC simulations while glass pre-IC simulations are more stable and accurate. The study shows that in the high redshift range, the coupling between large-scale tidal field and matter clustering is enhanced, highlighting the significance of tidal field on structure formation, especially during the epoch of reionization.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Ido Ben-Dayan, Utkarsh Kumar, Udaykrishna Thattarampilly, Amresh Verma
Summary: In this study, the NANOGrav signal on stochastic gravitational wave background is analyzed and the Universe's reheating phase is constrained using the latest measurements from NANOGrav. The analysis reveals a preference for instant reheating and a very blue tilt in the tensor spectrum. Additionally, a degeneracy between the tensor-to-scalar ratio and reheating temperature is found, with suggestions on ways to break this degeneracy.
Article
Astronomy & Astrophysics
Chong-Bin Chen, Jiro Soda
Summary: The study indicates that destabilization of standard slow-roll inflation commonly occurs in multi-scalar-gauge field inflationary scenarios.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Naonori S. Sugiyama, Daisuke Yamauchi, Tsutomu Kobayashi, Tomohiro Fujita, Shun Arai, Shin'ichi Hirano, Shun Saito, Florian Beutler, Hee-Jong Seo
Summary: We conducted a joint analysis of galaxy two- and three-point correlation functions to test modified gravity theories and constrain non-linear effects on cosmological scales. Applying this analysis to BOSS data, we obtained lower bounds on the parameters characterizing the time evolution of the second-order velocity field, which are consistent with GR predictions. The results showed significant improvement compared to the analysis using only the isotropic three-point correlation function.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Chia -Min Lin
Summary: In this paper, we revisit D-term inflation and provide bounds on the cosmic string tension using gravitational wave observations. We also consider the possible deviation of the spectral index compared with the ΛCDM model in light of prerecombination resolutions of the Hubble tension. Our study shows that D-term inflation requires very small coupling constants under these constraints, and we demonstrate that natural coupling constants (g = A = 0.1) can be achieved in the case of D-term inflation on the brane.
Article
Astronomy & Astrophysics
Julian E. Bautista, Romain Paviot, Mariana Vargas Magana, Sylvain de la Torre, Sebastien Fromenteau, Hector Gil-Marin, Ashley J. Ross, Etienne Burtin, Kyle S. Dawson, Jiamin Hou, Jean-Paul Kneib, Arnaud de Mattia, Will J. Percival, Graziano Rossi, Rita Tojeiro, Cheng Zhao, Gong-Bo Zhao, Shadab Alam, Joel Brownstein, Michael J. Chapman, Peter D. Choi, Chia-Hsun Chuang, Stephanie Escoffier, Axel de la Macorra, Helion du Mas des Bourboux, Faizan G. Mohammad, Jeongin Moon, Eva-Maria Mueller, Seshadri Nadathur, Jeffrey A. Newman, Donald Schneider, Hee-Jong Seo, Yuting Wang
Summary: In this study, the cosmological analysis of the eBOSS and BOSS LRGs sample provides joint constraints on three cosmological parameter combinations. The results are consistent with a flat Lambda cold dark matter model with standard gravity.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Naonori S. Sugiyama, Daisuke Yamauchi, Tsutomu Kobayashi, Tomohiro Fujita, Shun Arai, Shin'ichi Hirano, Shun Saito, Florian Beutler, Hee-Jong Seo
Summary: For the first time, we have conducted an observational test of the consistency relation for the large-scale structure (LSS) of the Universe by jointly analyzing the anisotropic two-and three-point correlation functions (2PCF and 3PCF) of galaxies. Using the Baryon Oscillation Spectroscopic Survey (BOSS) Data Release 12, we found no violation of the LSS consistency relation in our analysis within the statistical errors. Our analysis opens up a new observational window to test fundamental physics using anisotropic higher-order correlation functions of galaxy clustering.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Karoline Loeve, Kristine Simone Nielsen, Steen H. Hansen
Summary: This article investigates an alternative model without a cosmological constant, using numerical simulations to show that a force proportional to velocity squared can mimic the accelerated expansion observed in the universe.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Michel-Andres Breton, Sylvain de la Torre
Summary: This paper presents an alternative method for estimating random pair counts in two point statistics using an analytical expression that accounts for galaxy radial distance distribution, survey geometry, and galaxy weights. The main advantage of this approach is its efficiency and independence on the number of random points, providing accuracy comparable to using significantly more random points.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Multidisciplinary Sciences
Pierre-Philippe Dechant, Yang-Hui He
Summary: The study simplifies computationally expensive stochastic assembly models using a neural network, allowing for the quick determination of the fitness landscape in terms of assembly efficiency in just a matter of minutes with astounding accuracy.
Article
Mathematics, Applied
Anthony Lasenby, Joan Lasenby, Charalampos Matsantonis
Summary: This paper discusses methods for finding the rotor that connects an initial set of vectors to a final set of vectors. By using the characteristic multivector method in geometric algebra, we can find the best fit rotor and compare results with other methods in real applications.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2022)
Article
Mathematics, Applied
Anthony Lasenby
Summary: Different representations of the group SU(3)$$ SU(3) $$ using the Geometric Algebra approach are examined in this paper. The relationships between characteristic multivectors for SU(3)$$ SU(3) $$ and the decomposition of generators into commuting bivectors are also explored. The paper demonstrates how preserving both octonion norm and timelike part of the Dirac current can provide a new model for the preserved symmetries in particle physics. Additionally, links with larger groups such as G2$$ {G}_2 $$ and SU(8)$$ SU(8) $$ are discussed.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2023)
Article
Astronomy & Astrophysics
F. Poidevin, R. T. Genova-Santos, J. A. Rubino-Martin, C. H. Lopez-Caraballo, R. A. Watson, E. Artal, M. Ashdown, R. B. Barreiro, F. J. Casas, E. de la Hoz, M. Fernandez-Torreiro, F. Guidi, D. Herranz, R. J. Hoyland, A. N. Lasenby, E. Martinez-Gonzalez, M. W. Peel, L. Piccirillo, R. Rebolo, B. Ruiz-Granados, D. Tramonte, F. Vansyngel, P. Vielva
Summary: The QUIJOTE-MFI Northern Hemisphere Wide Survey has produced Spectral Energy Distributions of AME on a sample of 52 candidate compact sources. Our analysis reveals 44 sources with high AME significance. The study shows a strong correlation between thermal dust and AME, but no correlation between AME emissivity and free-free radiation Emission Measure.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
F. Guidi, R. T. Genova-Santos, J. A. Rubino-Martin, M. W. Peel, M. Fernandez-Torreiro, C. H. Lopez-Caraballo, R. Vignaga, E. de la Hoz, P. Vielva, R. A. Watson, M. Ashdown, C. Dickinson, E. Artal, R. B. Barreiro, F. J. Casas, D. Herranz, R. J. Hoyland, A. N. Lasenby, E. Martinez-Gonzalez, L. Piccirillo, F. Poidevin, R. Rebolo, B. Ruiz-Granados, D. Tramonte, F. Vansyngel
Summary: This paper presents a reanalysis of the Haze, including new observations from the Multi-Frequency Instrument (MFI) of the Q-U-I Joint TEnerife (QUIJOTE) experiment. An excess of diffuse intensity signal and polarized signal in the Haze area are detected, and their spectra are characterized. The results reveal differences in the spectrum of the Haze compared to Galactic synchrotron and the presence of polarized structures associated with Galactic Centre activity.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
E. de la Hoz, R. B. Barreiro, P. Vielva, E. Martinez-Gonzalez, J. A. Rubino-Martin, B. Casaponsa, F. Guidi, M. Ashdown, R. T. Genova-Santos, E. Artal, F. J. Casas, R. Fernandez-Cobos, M. Fernandez-Torreiro, D. Herranz, R. J. Hoyland, A. N. Lasenby, M. Lopez-Caniego, C. H. Lopez-Caraballo, M. W. Peel, L. Piccirillo, F. Poidevin, R. Rebolo, B. Ruiz-Granados, D. Tramonte, F. Vansyngel, R. A. Watson
Summary: We use a combination of data from various telescopes to obtain linearly polarized astrophysical component maps of the Northern Sky. The addition of QUIJOTE-MFI data improves the estimation of low-frequency foregrounds, particularly the synchrotron spectral index. We observe spatial variability in the beta(s) map and find that the power-law model of synchrotron emission fits well outside the Galactic plane but not within it. We also estimate thermal dust spectral parameters and find strong correlation with the Planck release.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
D. Herranz, M. Lopez-Caniego, C. H. Lopez-Caraballo, R. T. Genova-Santos, Y. C. Perrott, J. A. Rubino-Martin, R. Rebolo, E. Artal, M. Ashdown, R. B. Barreiro, F. J. Casas, E. de la Hoz, M. Fernandez-Torreiro, F. Guidi, R. J. Hoyland, A. N. Lasenby, E. Martinez-Gonzalez, M. W. Peel, L. Piccirillo, F. Poidevin, B. Ruiz-Granados, D. Tramonte, F. Vansyngel, P. Vielva, R. A. Watson
Summary: We present a catalogue of Q-U-I JOint TEnerife (QUIJO TE) Wide Survey radio sources extracted from maps compiled between 2012 and 2018. The catalogue contains 786 sources observed in intensity and polarization, with a significant fraction located within the Galactic plane region. We determine statistical and polarimetric properties for the sources, finding them to be consistent with current models and literature results for both flat- and steep-spectrum radio sources.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
J. A. Rubino-Martin, F. Guidi, R. T. Genova-Santos, S. E. Harper, D. Herranz, R. J. Hoyland, A. N. Lasenby, F. Poidevin, R. Rebolo, B. Ruiz-Granados, F. Vansyngel, P. Vielva, R. A. Watson, E. Artal, M. Ashdown, R. B. Barreiro, J. D. Bilbao-Ahedo, F. J. Casas, B. Casaponsa, R. Cepeda-Arroita, E. de la Hoz, C. Dickinson, R. Fernandez-Cobos, M. Fernandez-Torreiro, R. Gonzalez-Gonzalez, C. Hernandez-Monteagudo, M. Lopez-Caniego, C. Lopez-Caraballo, E. Martinez-Gonzalez, M. W. Peel, A. E. Pelaez-Santos, Y. Perrott, L. Piccirillo, N. Razavi-Ghods, P. Scott, D. Titterington, D. Tramonte, R. Vignaga
Summary: We present intensity and polarization maps at four frequency bands centred around 11, 13, 17, and 19 GHz, covering a large portion of the northern sky region. The maps were derived from observations made between May 2013 and June 2018 using the first QUIJOTE multifrequency instrument (MFI), with high angular resolutions and sensitivities. We discuss the data processing pipeline, calibration accuracy, and characteristics of the maps.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
D. Tramonte, R. T. Genova-Santos, J. A. Rubino-Martin, P. Vielva, F. Poidevin, C. H. Lopez-Caraballo, M. W. Peel, M. Ashdown, E. Artal, R. B. Barreiro, F. J. Casas, E. de la Hoz, M. Fernandez-Torreiro, F. Guidi, D. Herranz, R. J. Hoyland, A. N. Lasenby, E. Martinez-Gonzalez, L. Piccirillo, R. Rebolo, B. Ruiz-Granados, F. Vansyngel, R. A. Watson
Summary: We present new intensity and polarization maps obtained with the QUIJOTE experiment towards the Galactic regions W49, W51 and IC443. We detect anomalous microwave emission (AME) in total intensity towards W49 and W51, and measure a broken power-law synchrotron spectrum towards IC443. The polarized SEDs reveal a synchrotron contribution without evidence of polarized AME emission in this study.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Multidisciplinary Sciences
Greg Ashton, Noam Bernstein, Johannes Buchner, Xi Chen, Gabor Csanyi, Andrew Fowlie, Farhan Feroz, Matthew Griffiths, Will Handley, Michael Habeck, Edward Higson, Michael Hobson, Anthony Lasenby, David Parkinson, Livia B. Partay, Matthew Pitkin, Doris Schneider, Joshua S. Speagle, Leah South, John Veitch, Philipp Wacker, David J. Wales, David Yallup
Summary: This Primer examines Skilling's nested sampling algorithm and its application in Bayesian inference and multidimensional integration. The principles of nested sampling are summarized and recent developments using efficient nested sampling algorithms in high dimensions are surveyed. Detailed examples from cosmology, gravitational-wave astronomy, and materials science are provided. Finally, the Primer includes recommendations for best practices and a discussion of potential limitations and optimizations of nested sampling.
NATURE REVIEWS METHODS PRIMERS
(2022)
Article
Astronomy & Astrophysics
L. T. Hergt, F. J. Agocs, W. J. Handley, M. P. Hobson, A. N. Lasenby
Summary: The study finds that nonzero spatial curvature has significant effects on cosmic inflation, with CMB data showing a preference for closed universes with curvature. Model comparisons suggest that the Starobinsky model outperforms most other inflation models.
Article
Physics, Particles & Fields
Michael Hobson, Anthony Lasenby
Summary: This study investigates conformally invariant gravity theories defined on Riemannian spacetime with the Schwarzschild-de-Sitter metric as a solution, exploring the possibility of obtaining flat rotation curves without the need for dark matter by conformally rescaling this solution. The research shows that trajectories of "ordinary" matter particles in any conformal frame are timelike geodesics of the SdS metric, which resolves the frame dependence issue and unambiguously yields non-flat rotation curves.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
D. J. Bartlett, W. J. Handley, A. N. Lasenby
Summary: In this paper, we observationally examine cosmological models based on primordial power spectra with quantized wave vectors. We find that introducing a linearly quantized power spectrum provides a better fit to the Planck 2018 observations, and the requirement for perturbations to remain finite beyond the future conformal boundary results in a linearly quantized primordial power spectrum. However, the infrared cutoffs for this quantized cosmology are not compatible with observed cosmic microwave background power spectra, but future theories may predict more observationally consistent quantized spectra.
Article
Astronomy & Astrophysics
A. N. Lasenby, W. J. Handley, D. J. Bartlett, C. S. Negreanu
Summary: The concordance model of cosmology predicts the end of the universe at a future conformal boundary, but for specific cases, the background variables and perturbations can be continued beyond this boundary. These theoretical considerations might have observable consequences today and can be relevant to the power spectrum of perturbation modes in the cosmic microwave background.
Article
Astronomy & Astrophysics
M. P. Hobson, A. N. Lasenby
Summary: This paper reconsiders the status of the second clock effect in Weyl gauge theories of gravity, which are invariant under local Poincare transformations and local changes of scale. In particular, the authors revisit and extend their previous demonstration that the second clock effect does not occur in such theories to clarify their argument and confirm their original findings in response to recent counterclaims.