Beecroft Institute for Particle Astrophysics and Cosmology

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Catalog-based pseudo-Cℓ s

Journal of Cosmology and Astroparticle Physics IOP Publishing 2025:01 (2025) 028-028

Authors:

Kevin Wolz, David Alonso, Andrina Nicola

Abstract:

<jats:title>Abstract</jats:title> <jats:p>We present a formalism to extract the angular power spectrum of fields sampled at a finite number of points with arbitrary positions — a common situation for several catalog-based astrophysical probes — through a simple extension of the standard pseudo-<jats:italic>C<jats:sub>ℓ</jats:sub> </jats:italic> algorithm. A key complication in this case is the need to handle the shot noise component of the associated discrete angular mask which, for sparse catalogs, can lead to strong coupling between very different angular scales. We show that this problem can be solved easily by estimating this contribution analytically and subtracting it. The resulting estimator is immune to small-scale pixelization effects and aliasing, and, most notably, unbiased against the contribution from measurement noise uncorrelated between different sources. We demonstrate the validity of the method in the context of cosmic shear datasets, and showcase its usage in the case of other spin-0 and spin-1 astrophysical fields of interest. We incorporate the method in the public <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="https://github.com/LSSTDESC/NaMaster" xlink:type="simple">&lt;monospace&gt;NaMaster&lt;/monospace&gt;</jats:ext-link> code.</jats:p>
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Forty years of the Ellis–Baldwin test

Nature Reviews Physics Springer Nature (2025)

Authors:

Nathan Secrest, Sebastian von Hausegger, Mohamed Rameez, Roya Mohayaee, Subir Sarkar

Abstract:

Modern cosmology is built on the assumption that the Universe is homogeneous and isotropic on large scales — but this is challenged by results of the Ellis–Baldwin test that show an unexplained anomaly in the distribution of distant galaxies and quasars.
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Robustness of inflation to kinetic inhomogeneities

Journal of Cosmology and Astroparticle Physics IOP Publishing 2025:01 (2025) 050

Authors:

Matthew Elley, Josu C Aurrekoetxea, Katy Clough, Raphael Flauger, Panagiotis Giannadakis, Eugene A Lim
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Euclid preparation

Astronomy & Astrophysics EDP Sciences 693 (2025) a58

Authors:

M Archidiacono, J Lesgourgues, S Casas, S Pamuk, N Schöneberg, Z Sakr, G Parimbelli, A Schneider, F Hervas Peters, F Pace, VM Sabarish, M Costanzi, S Camera, C Carbone, S Clesse, N Frusciante, A Fumagalli, P Monaco, D Scott, M Viel, A Amara, S Andreon, N Auricchio, M Baldi, S Bardelli, C Bodendorf, D Bonino, E Branchini, M Brescia, J Brinchmann, V Capobianco, VF Cardone, J Carretero, M Castellano, S Cavuoti, A Cimatti, G Congedo, CJ Conselice, L Conversi, Y Copin, F Courbin, HM Courtois, A Da Silva, H Degaudenzi, M Douspis, F Dubath, CAJ Duncan, X Dupac, S Dusini, A Ealet, M Farina, S Farrens, S Ferriol, M Frailis, E Franceschi, S Galeotta, B Gillis, C Giocoli, A Grazian, F Grupp, L Guzzo, SVH Haugan, H Hoekstra, F Hormuth, A Hornstrup, K Jahnke, B Joachimi, E Keihänen, S Kermiche, A Kiessling, M Kilbinger, T Kitching, B Kubik, M Kunz, H Kurki-Suonio, S Ligori, PB Lilje, V Lindholm, I Lloro, D Maino, E Maiorano, O Mansutti, O Marggraf, K Markovic, N Martinet, F Marulli, R Massey, S Maurogordato, HJ McCracken, E Medinaceli, S Mei, Y Mellier, M Meneghetti, E Merlin, G Meylan, M Moresco, L Moscardini, E Munari, S-M Niemi, JW Nightingale, C Padilla, S Paltani, F Pasian, K Pedersen, WJ Percival, V Pettorino, S Pires, G Polenta, M Poncet, LA Popa, L Pozzetti, F Raison, R Rebolo, A Renzi, J Rhodes, G Riccio, E Romelli, M Roncarelli, R Saglia, D Sapone, B Sartoris, R Scaramella, M Schirmer, P Schneider, T Schrabback, A Secroun, G Seidel, S Serrano, C Sirignano, G Sirri, L Stanco, P Tallada-Crespí, AN Taylor, I Tereno, R Toledo-Moreo, F Torradeflot, I Tutusaus, L Valenziano, T Vassallo, A Veropalumbo, Y Wang, J Weller, G Zamorani, J Zoubian, E Zucca, A Biviano, A Boucaud, E Bozzo, C Burigana, M Calabrese, C Colodro-Conde, M Crocce, G Fabbian, J Graciá-Carpio, G Mainetti, M Martinelli, N Mauri, C Neissner, V Scottez, M Tenti, M Wiesmann, Y Akrami, S Anselmi, C Baccigalupi, M Ballardini, F Bernardeau, D Bertacca, S Borgani, E Borsato, S Bruton, R Cabanac, A Cappi, CS Carvalho, G Castignani, T Castro, G Cañas-Herrera, KC Chambers, S Contarini, AR Cooray, J Coupon, S Davini, S de la Torre, G De Lucia, G Desprez, S Di Domizio, A Díaz-Sánchez, JA Escartin Vigo, S Escoffier, PG Ferreira, I Ferrero, F Finelli, L Gabarra, K Ganga, J García-Bellido, E Gaztanaga, F Giacomini, G Gozaliasl, A Gregorio, A Hall, H Hildebrandt, S Ilić, JJE Kajava, V Kansal, D Karagiannis, CC Kirkpatrick, L Legrand, A Loureiro, J Macias-Perez, G Maggio, M Magliocchetti, F Mannucci, R Maoli, CJAP Martins, S Matthew, L Maurin, RB Metcalf, M Migliaccio, G Morgante, S Nadathur, Nicholas A Walton, L Patrizii, A Pezzotta, M Pöntinen, V Popa, C Porciani, D Potter, P Reimberg, I Risso, P-F Rocci, M Sahlén, AG Sánchez, E Sefusatti, M Sereno, P Simon, A Spurio Mancini, J Steinwagner, G Testera, M Tewes, R Teyssier, S Toft, S Tosi, A Troja, M Tucci, C Valieri, J Valiviita, D Vergani, G Verza, P Vielzeuf
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Euclid preparation

Astronomy & Astrophysics EDP Sciences 693 (2025) a59

Authors:

H Böhringer, G Chon, O Cucciati, H Dannerbauer, M Bolzonella, G De Lucia, A Cappi, L Moscardini, C Giocoli, G Castignani, NA Hatch, S Andreon, E Bañados, S Ettori, F Fontanot, H Gully, M Hirschmann, M Maturi, S Mei, L Pozzetti, T Schlenker, M Spinelli, N Aghanim, B Altieri, N Auricchio, C Baccigalupi, M Baldi, S Bardelli, C Bodendorf, D Bonino, E Branchini, M Brescia, J Brinchmann, S Camera, V Capobianco, C Carbone, J Carretero, S Casas, FJ Castander, M Castellano, S Cavuoti, A Cimatti, C Colodro-Conde, G Congedo, CJ Conselice, L Conversi, Y Copin, F Courbin, HM Courtois, A Da Silva, H Degaudenzi, AM Di Giorgio, J Dinis, M Douspis, F Dubath, CAJ Duncan, X Dupac, S Dusini, M Farina, S Farrens, F Faustini, P Fosalba, M Frailis, E Franceschi, M Fumana, S Galeotta, B Gillis, P Gómez-Alvarez, A Grazian, F Grupp, SVH Haugan, W Holmes, F Hormuth, A Hornstrup, P Hudelot, K Jahnke, M Jhabvala, B Joachimi, E Keihänen, S Kermiche, A Kiessling, M Kilbinger, B Kubik, M Kümmel, M Kunz, H Kurki-Suonio, S Ligori, PB Lilje, V Lindholm, I Lloro, G Mainetti, D Maino, E Maiorano, O Mansutti, O Marggraf, K Markovic, M Martinelli, N Martinet, F Marulli, R Massey, S Maurogordato, E Medinaceli, Y Mellier, M Meneghetti, G Meylan, M Moresco, S-M Niemi, C Padilla, S Paltani, F Pasian, K Pedersen, V Pettorino, S Pires, G Polenta, M Poncet, LA Popa, F Raison, R Rebolo, A Renzi, J Rhodes, G Riccio, E Romelli, M Roncarelli, E Rossetti, R Saglia, Z Sakr, AG Sánchez, D Sapone, B Sartoris, M Schirmer, P Schneider, M Scodeggio, A Secroun, G Seidel, S Serrano, C Sirignano, G Sirri, L Stanco, J Steinwagner, P Tallada-Crespí, AN Taylor, I Tereno, R Toledo-Moreo, F Torradeflot, I Tutusaus, T Vassallo, G Verdoes Kleijn, A Veropalumbo, Y Wang, J Weller, G Zamorani, E Zucca, E Bozzo, C Burigana, M Calabrese, D Di Ferdinando, JA Escartin Vigo, F Finelli, J Gracia-Carpio, S Matthew, N Mauri, M Pöntinen, C Porciani, V Scottez, M Tenti, M Viel, M Wiesmann, Y Akrami, V Allevato, S Alvi, S Anselmi, M Archidiacono, F Atrio-Barandela, A Balaguera-Antolinez, M Ballardini, A Blanchard, L Blot, S Borgani, S Bruton, R Cabanac, A Calabro, F Caro, CS Carvalho, T Castro, KC Chambers, S Contarini, AR Cooray, M Costanzi, B De, G Desprez, A Díaz-Sánchez, S Di Domizio, H Dole, S Escoffier, AG Ferrari, PG Ferreira, I Ferrero, A Fontana, F Fornari, L Gabarra, K Ganga, J García-Bellido, T Gasparetto, V Gautard, E Gaztanaga, F Giacomini, F Gianotti, AH Gonzalez, G Gozaliasl, CM Gutierrez, A Hall, WG Hartley, H Hildebrandt, J Hjorth, A Jimenez Muñoz, JJE Kajava, V Kansal, D Karagiannis, CC Kirkpatrick, L Legrand, J Lesgourgues, TI Liaudat, A Loureiro, J Macias-Perez, G Maggio, M Magliocchetti, C Mancini, F Mannucci, R Maoli, CJAP Martins, L Maurin, RB Metcalf, M Miluzio, P Monaco, A Montoro, A Mora, C Moretti, G Morgante, NA Walton, L Patrizii, V Popa, D Potter, I Risso, P-F Rocci, M Sahlén, A Schneider, M Schultheis, M Sereno, F Shankar, P Simon, A Spurio Mancini, J Stadel, SA Stanford, K Tanidis, C Tao, G Testera, R Teyssier, S Toft, S Tosi, A Troja, M Tucci, C Valieri, J Valiviita, D Vergani, G Verza
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