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
Vicente Atal, Albert Sanglas, Nikolaos Triantafyllou
Summary: The study suggests that the signal detected by NANOGrav could be from the stochastic gravitational wave background of binary mergers of primordial Stupendously Large Black Holes, which contribute roughly 0.1% of the dark matter. Overcoming the stringent limits from mu distortions of the CMB is possible if the perturbations in these black holes derive from the expected non-Gaussian distribution of fluctuations. However, the stochastic background from binaries with masses less than or equal to 10^11M-solar masses is excluded by constraints from large scale structure.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Julien Bel, Julien Larena, Roy Maartens, Christian Marinoni, Louis Perenon
Summary: This study analyzes the clustering of matter on large scales considering spatial curvature and develops a consistent approach to calculate the 2-point correlation function in redshift space. The use of the 'Clustering Ratio' as a probe of clustering, in combination with low-redshift background probes, provides powerful cosmological constraints independent of CMB information. The study finds that the flat concordance model with curvature is consistent with the observed data, and the use of clustering ratio measurements can provide valuable low-redshift clustering data that is compatible with the CMB.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Jose Ramon Bermejo-Climent, Mario Ballardini, Fabio Finelli, Daniela Paoletti, Roy Maartens, Jose Alberto Rubino-Martin, Luca Valenziano
Summary: The study focuses on forecasting the information contained in the cross-correlation between CMB fields and matter tracers for future cosmological observations. The results show that the cross-correlation can improve the constraints on cosmological parameters, with potential implications for dark energy and neutrino mass detection. The study also highlights the importance of understanding the additional constraining power of cross-correlation between CMB and galaxy clustering for future surveys.
Article
Environmental Sciences
Yuqi Wu, Chenqing Fan, Qiushuang Yan, Junmin Meng, Tianran Song, Jie Zhang
Summary: In this paper, the effects of wind wave spectra, non-Gaussianity of the sea surface, and swell on the distribution of the facet normalized radar cross section (NRCS) are analyzed. The results show that the Apel spectrum achieves a more consistent NRCS distribution at low incidence angles, while the composite spectra perform better at high incidence angles under VV polarization. The modified TSM successfully predicts the upwind-downwind asymmetry of backscattering and the distribution of scattering simulated by the modified TSM deviates significantly from the Gaussian distribution.
Article
Multidisciplinary Sciences
A. Soldati, J. A. Farrell, R. Wysocki, J. A. Karson
Summary: In ferrovolcanism, metallic lava is denser and less viscous than silicate lava, resulting in faster-moving flows with braided channels. The metallic flow mainly occurs underneath the silicate flow and as breakouts from the silicate flow front, with mingling of the two liquids at the interface.
NATURE COMMUNICATIONS
(2021)
Article
Astronomy & Astrophysics
G. A. Pena, G. N. Candlish
Summary: The late-time effect of primordial non-Gaussianity in the early Universe is studied in this work. By generating multiple realizations of cosmological structure and analyzing the matter power spectrum, bispectrum, and trispectrum, it is found that the initial non-Gaussianity has only a small imprint on the first three polyspectra. Some models show interesting scale-dependent deviations from the Gaussian case in the bispectrum and trispectrum, although the signal is at most at the per cent level.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Salome Mtchedlidze, Paola Dominguez-Fernandez, Xiaolong Du, Axel Brandenburg, Tina Kahniashvili, Shane O'Sullivan, Wolfram Schmidt, Marcus Brueggen
Summary: This article investigates the formation and evolution of primordial magnetic fields (PMFs) through cosmological simulations. The study finds that the observed magnetic field configuration retains information about the initial conditions, offering indirect evidence for understanding the early universe. Differences between competing models are revealed at different scales, and the spectral evolution of seed fields leaves imprints on the correlation length today. The article also discusses how forthcoming surveys can be used to probe the differences in rotation measures from highly ionized regions.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Peter L. Taylor, Katarina Markovi
Summary: In this study, we analytically derive the covariance expression between the photometric two-dimensional angular power spectra and the three-dimensional redshift-space power spectrum under the plane-parallel approximation. We find that these two measurements are covariant on large radial scales, but since this covariance only accounts for a small fraction of the total Fourier space coverage, it is safe to neglect it when performing cosmological parameter inference.
Article
Astronomy & Astrophysics
Huanqing Chen, Rupert A. C. Croft, Nickolay Y. Gnedin
Summary: In this study, a convolutional neural network (CNN) method is used to recover the temperature distribution around quasars and estimate their lifetimes. The results show that the simple CNN can accurately recover the temperature profile with an accuracy of approximately 1400K in an idealized case. However, observational noise poses a significant challenge and can reduce the accuracy to approximately 2340K even with high signal-to-noise spectra.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Physics, Multidisciplinary
Pritha Bari, Angelo Ricciardone, Nicola Bartolo, Daniele Bertacca, Sabino Matarrese
Summary: We study the generation and evolution of second-order energy-density perturbations caused by primordial gravitational waves. These perturbations may leave observable signatures in the large-scale structure of the Universe. By observing specific features in the matter or galaxy power spectrum, we can constrain or detect primordial gravitational waves, allowing us to explore them on scales that have not been previously explored.
PHYSICAL REVIEW LETTERS
(2022)
Article
Astronomy & Astrophysics
Griffin Hosseinzadeh, David J. Sand, Sumit K. Sarbadhicary, Stuart D. Ryder, Saurabh W. Jha, Yize Dong, K. Azalee Bostroem, Jennifer E. Andrews, Emily Hoang, Daryl Janzen, Jacob E. Jencson, Michael Lundquist, Nicolas E. Meza Retamal, Jeniveve Pearson, Manisha Shrestha, Stefano Valenti, Samuel Wyatt, Joseph Farah, D. Andrew Howell, Curtis McCully, Megan Newsome, Estefania Padilla Gonzalez, Craig Pellegrino, Giacomo Terreran, Muzoun Alzaabi, Elizabeth M. Green, Jessica L. Gurney, Peter A. Milne, Kaycee I. Ridenhour, Nathan Smith, Paulina Soto Robles, Lindsey A. Kwok, Michaela Schwab, Mariusz Gromadzki, David A. H. Buckley, Koichi Itagaki, Daichi Hiramatsu, Laura Chomiuk, Peter Lundqvist, Joshua Haislip, Vladimir Kouprianov, Daniel E. Reichart
Summary: We present early observations of supernova 2023bee, which show excess in the optical and UV bands during the first few days after the explosion. These observations provide insights into the nature of the binary companion and the conditions leading to ignition. The Kasen model of a main-sequence companion star causing shock on the ejecta matches our data well, while other models like double detonations and interaction with circumstellar material do not. Our radio nondetections suggest that the companion is likely a main-sequence star.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
M. Marsset, M. Broz, J. Vermersch, N. Rambaux, M. Ferrais, M. Viikinkoski, J. Hanus, E. Jehin, E. Podlewska-Gaca, P. Bartczak, G. Dudzinski, B. Carry, P. Vernazza, R. Szakats, R. Duffard, A. Jones, D. Molina, T. Santana-Ros, Z. Benkhaldoun, M. Birlan, C. Dumas, R. Fetick, T. Fusco, L. Jorda, F. Marchis, F. Vachier, B. Yang
Summary: The shape and rotation state of Cybele are found to closely match those of a Maclaurin equilibrium figure, suggesting that its present-day shape represents the original one. However, numerical simulations also show that Cybele is dynamically unstable and may have been placed on its current orbit less than 1 billion years ago.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Sean Morrison, Matthew M. Pieri, Debopam Som, Ignasi Perez-Rafols
Summary: The study investigates large-scale UV background inhomogeneities associated with high redshift quasar populations by measuring metal absorption in quasar absorption spectrum stacking. Stronger high ionization species absorption is observed closer to quasars at 2.4 < z < 3.1. Additionally, weak signs of increasing homogeneity with time are explored in the range of 2.05 < z < 2.4. Limitations of incomplete quasar samples are noted in the interpretation of results.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Julian Adamek, Juan Calles, Thomas Montandon, Jorge Norena, Clement Stahl
Summary: Relativistic corrections to the evolution of structure can be tested using the numerical framework presented in this study. The framework generates RELativistic second-order Initial Conditions (RELIC) based on a generic second-order kernel for density perturbations. The results show that the generated initial conditions reproduce bispectra well, demonstrating the effectiveness of the framework. Additionally, a generic algorithm is provided to set precise initial conditions for cosmological simulations of large-scale structure.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Stephon Alexander, Evan McDonough, Anthony Pullen, Bradley Shapiro
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2020)
Article
Physics, Applied
P. A. R. Ade, C. J. Anderson, E. M. Barrentine, N. G. Bellis, A. D. Bolatto, P. C. Breysse, B. T. Bulcha, G. Cataldo, J. A. Connors, P. W. Cursey, N. Ehsan, H. C. Grant, T. M. Essinger-Hileman, L. A. Hess, M. O. Kimball, A. J. Kogut, A. D. Lamb, L. N. Lowe, P. D. Mauskopf, J. McMahon, M. Mirzaei, S. H. Moseley, J. W. Mugge-Durum, O. Noroozian, U. Pen, A. R. Pullen, S. Rodriguez, P. J. Shirron, R. S. Somerville, T. R. Stevenson, E. R. Switzer, C. Tucker, E. Visbal, C. G. Volpert, E. J. Wollack, S. Yang
JOURNAL OF LOW TEMPERATURE PHYSICS
(2020)
Article
Astronomy & Astrophysics
Shengqi Yang, Xiaolong Du, Andrew J. Benson, Anthony R. Pullen, Annika H. G. Peter
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Article
Astronomy & Astrophysics
Yucheng Zhang, Anthony R. Pullen, Shadab Alam, Sukhdeep Singh, Etienne Burtin, Chia-Hsun Chuang, Jiamin Hou, Brad W. Lyke, Adam D. Myers, Richard Neveux, Ashley J. Ross, Graziano Rossi, Cheng Zhao
Summary: The study tests gravity at high redshift and large scales, finding that general relativity predictions hold true at various scales. The use of a large sample size and simulations for validation has potential for constraining modified gravity models in the future.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Shengqi Yang, Rachel S. Somerville, Anthony R. Pullen, Gergo Popping, Patrick C. Breysse, Abhishek S. Maniyar
Summary: Submillimeter emission lines are important for tracing the cold gas and ionized environments of galaxies, and for future line intensity mapping surveys. Physics-based simulations predicting emission lines from different interstellar medium phases are crucial for understanding galaxy physical conditions. This study presents a framework for creating mock submillimeter line intensity maps and shows significant differences in predicted star formation rate and line emission scaling relations compared to empirical relations. These differences impact key summary statistics used in intensity mapping, emphasizing the need for realistic models in forecasting the capabilities of future surveys.
ASTROPHYSICAL JOURNAL
(2021)
Article
Engineering, Aerospace
Eric R. Switzer, Emily M. Barrentine, Giuseppe Cataldo, Thomas Essinger-Hileman, Peter A. R. Ade, Christopher J. Anderson, Alyssa Barlis, Jeffrey Beeman, Nicholas Bellis, Alberto D. Bolatto, Patrick C. Breysse, Berhanu T. Bulcha, Lee-Roger Chevres-Fernanadez, Chullhee Cho, Jake A. Connors, Negar Ehsan, Jason Glenn, Joseph Golec, James P. Hays-Wehle, Larry A. Hess, Amir E. Jahromi, Trevian Jenkins, Mark O. Kimball, Alan J. Kogut, Luke N. Lowe, Philip Mauskopf, Jeffrey McMahon, Mona Mirzaei, Harvey Moseley, Jonas Mugge-Durum, Omid Noroozian, Trevor M. Oxholm, Tatsat Parekh, Ue-Li Pen, Anthony R. Pullen, Maryam Rahmani, Mathias M. Ramirez, Florian Roselli, Konrad Shire, Gage Siebert, Adrian K. Sinclair, Rachel S. Somerville, Ryan Stephenson, Thomas R. Stevenson, Peter Timbie, Jared Termini, Justin Trenkamp, Carole Tucker, Elijah Visbal, Carolyn G. Volpert, Edward J. Wollack, Shengqi Yang, L. Y. Aaron Yung
Summary: The cryogenic large-aperture intensity mapping experiment (EXCLAIM) is a balloon-borne telescope designed to survey star formation by mapping the emission of carbon lines and carbon monoxide. It achieves high sensitivity and resolution through the use of intensity mapping techniques.
JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS
(2021)
Article
Astronomy & Astrophysics
Shengqi Yang, Gergoe Popping, Rachel S. Somerville, Anthony R. Pullen, Patrick C. Breysse, Abhishek S. Maniyar
Summary: This study presents an empirical multiline emission model that describes the characteristics of emission lines produced by the interstellar medium at different redshift ranges. By fitting to semianalytic simulation results, the model can efficiently predict the statistics of ISM emission lines, which is of great importance for upcoming LIM surveys.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Patrick C. Breysse, Shengqi Yang, Rachel S. Somerville, Anthony R. Pullen, Gergoe Popping, Abhishek S. Maniyar
Summary: The Millimeter-wave Intensity Mapping Experiment (mmIME) reported excess spatial fluctuations at a wavelength of 3 mm, which could be due to unresolved emissions of CO rotational transitions. Using state-of-the-art semianalytic simulations, the study found that the predictions are slightly inconsistent with the mmIME result, and proposed simple modifications to resolve this tension.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Chang Chen, Anthony R. Pullen
Summary: Line intensity mapping (LIM) has the potential to accurately measure scale-dependence bias from primordial non-Gaussianity (PNG), but it is susceptible to contamination from foreground emission. This study models the effect of line interlopers on LIM and finds that neglecting interlopers in parameter estimation can lead to significant bias. Including interlopers in the parameter estimation reduces errors in PNG constraints and mitigates false positives for non-standard inflation models. Applying cross-correlation techniques can effectively reduce interloper contamination, almost eliminating the effect of interlopers when measuring non-Gaussianity.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Yucheng Zhang, Anthony R. Pullen, Rachel S. Somerville, Patrick C. Breysse, John C. Forbes, Shengqi Yang, Yin Li, Abhishek S. Maniyar
Summary: Line-intensity mapping (LIM) is a promising technique for studying the global distribution of galaxy properties. In this work, a physically motivated modeling framework called conditional galaxy property distribution (CGPD) is introduced and modeled. CGPD represents the distribution of galaxy properties conditioned on halo mass and redshift, and it can be used to derive important galaxy distribution functions and scaling relations. Using two different types of cosmological galaxy simulations, it is found that a Gaussian mixture model (GMM) can accurately describe the CGPD with just a few components.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Ekapob Kulchoakrungsun, Ananya Mukherjee, Nishant Agarwal, Anthony R. Pullen
Summary: We study the background dynamics and growth of matter perturbations in massive gravity. We find stable perturbations under certain conditions in a specific choice of potential where the scalar field behaves like pressureless matter. We observe scale-independent growth in the study of matter perturbation growth.
Article
Astronomy & Astrophysics
Abhishek S. Maniyar, Emmanuel Schaan, Anthony R. Pullen
Summary: This paper introduces a new technique that combines line intensity mapping and lensing to explore the high-redshift universe. The paper proposes a foreground avoidance method that effectively eliminates the interference bias. This method demonstrates robustness to changes in the amplitude of the interference power and non-Gaussianity.
Article
Astronomy & Astrophysics
Yucheng Zhang, Anthony R. Pullen, Abhishek S. Maniyar
Summary: Cross-correlating CMB lensing and galaxy clustering can improve constraints on the local primordial non-Gaussianity parameter f(NL) and the growth rate of structure. Using a SFB decomposition with large radial modes can significantly enhance the constraint on f(NL). Future wide-field high-redshift photometric surveys may lead to improved constraints.
Article
Astronomy & Astrophysics
Shengqi Yang, Anthony R. Pullen, Eric R. Switzer
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2019)
Article
Astronomy & Astrophysics
E. R. Switzer, C. J. Anderson, A. R. Pullen, S. Yang
ASTROPHYSICAL JOURNAL
(2019)