PRISM (Polarized Radiation Imaging and Spectroscopy Mission): An Extended White Paper

ArXiv 1310.1554 (2013)

Authors:

PRISM Collaboration, Philippe André, Carlo Baccigalupi, Anthony Banday, Domingos Barbosa, Belen Barreiro, James Bartlett, Nicola Bartolo, Elia Battistelli, Richard Battye, George Bendo, Alain Benoît, Jean-Philippe Bernard, Marco Bersanelli, Matthieu Béthermin, Pawel Bielewicz, Anna Bonaldi, François Bouchet, François Boulanger, Jan Brand, Martin Bucher, Carlo Burigana, Zhen-Yi Cai, Philippe Camus, Francisco Casas, Viviana Casasola, Guillaume Castex, Anthony Challinor, Jens Chluba, Gayoung Chon, Sergio Colafrancesco, Barbara Comis, Francesco Cuttaia, Giuseppe D'Alessandro, Antonio Da Silva, Richard Davis, Miguel de Avillez, Paolo de Bernardis, Marco de Petris, Adriano de Rosa, Gianfranco de Zotti, Jacques Delabrouille, François-Xavier Désert, Clive Dickinson, Jose Maria Diego, Joanna Dunkley, Torsten Enßlin, Josquin Errard, Edith Falgarone, Pedro Ferreira, Katia Ferrière, Fabio Finelli, Andrew Fletcher, Pablo Fosalba, Gary Fuller, Silvia Galli, Ken Ganga, Juan García-Bellido, Adnan Ghribi, Martin Giard, Yannick Giraud-Héraud, Joaquin Gonzalez-Nuevo, Keith Grainge, Alessandro Gruppuso, Alex Hall, Jean-Christophe Hamilton, Marijke Haverkorn, Carlos Hernandez-Monte-agudo, Diego Herranz, Mark Jackson, Andrew Jaffe, Rishi Khatri, Martin Kunz, Luca Lamagna, Massimiliano Lattanzi, Paddy Leahy, Julien Lesgourgues, Michele Liguori, Elisabetta Liuzzo, Marcos Lopez-Caniego, Juan Macias-Perez, Bruno Maffei, Davide Maino, Anna Mangilli, Enrique Martinez-Gonzalez, Carlos Martins, Silvia Masi, Marcella Massardi, Sabino Matarrese, Alessandro Melchiorri, Jean-Baptiste Melin, Aniello Mennella, Arturo Mignano, Marc-Antoine Miville-Deschênes, Alessandro Monfardini, Anthony Murphy, Pavel Naselsky, Federico Nati, Paolo Natoli, Mattia Negrello, Fabio Noviello, Créidhe O'Sullivan, Francesco Paci, Luca Pagano, Rosita Paladino, Nathalie Palanque-Delabrouille, Daniela Paoletti, Hiranya Peiris, Francesca Perrotta, Francesco Piacentini, Michel Piat, Lucio Piccirillo, Giampaolo Pisano, Gianluca Polenta, Agnieszka Pollo, Nicolas Ponthieu, Mathieu Remazeilles, Sara Ricciardi, Matthieu Roman, Cyrille Rosset, Jose-Alberto Rubino-Martin, Maria Salatino, Alessandro Schillaci, Paul Shellard, Joseph Silk, Alexei Starobinsky, Radek Stompor, Rashid Sunyaev, Andrea Tartari, Luca Terenzi, Luigi Toffolatti, Maurizio Tomasi, Neil Trappe, Matthieu Tristram, Tiziana Trombetti, Marco Tucci, Rien Van de Weijgaert, Bartjan Van Tent, Licia Verde, Patricio Vielva, Ben Wandelt, Robert Watson, Stafford Withington

Abstract:

PRISM (Polarized Radiation Imaging and Spectroscopy Mission) was proposed to ESA in May 2013 as a large-class mission for investigating within the framework of the ESA Cosmic Vision program a set of important scientific questions that require high resolution, high sensitivity, full-sky observations of the sky emission at wavelengths ranging from millimeter-wave to the far-infrared. PRISM's main objective is to explore the distant universe, probing cosmic history from very early times until now as well as the structures, distribution of matter, and velocity flows throughout our Hubble volume. PRISM will survey the full sky in a large number of frequency bands in both intensity and polarization and will measure the absolute spectrum of sky emission more than three orders of magnitude better than COBE FIRAS. The aim of this Extended White Paper is to provide a more detailed overview of the highlights of the new science that will be made possible by PRISM

A few cosmological implications of tensor nonlocalities

(2013)

Authors:

Pedro G Ferreira, Antonio L Maroto

A few cosmological implications of tensor nonlocalities

ArXiv 1310.1238 (2013)

Authors:

Pedro G Ferreira, Antonio L Maroto

Abstract:

We consider nonlocal gravity theories that include tensor nonlocalities. We show that in the cosmological context, the tensor nonlocalities, unlike scalar ones, generically give rise to growing modes. An explicit example with quadratic curvature terms is studied in detail. Possible consequences for recent nonlocal cosmological models proposed in the literature are also discussed.

A Fast Route to Modified Gravitational Growth

(2013)

Authors:

Tessa Baker, Pedro G Ferreira, Constantinos Skordis

A Fast Route to Modified Gravitational Growth

ArXiv 1310.1086 (2013)

Authors:

Tessa Baker, Pedro G Ferreira, Constantinos Skordis

Abstract:

The growth rate of the large-scale structure of the universe has been advocated as the observable par excellence for testing gravity on cosmological scales. By considering linear-order deviations from General Relativity, we show that corrections to the growth rate, f, can be expressed as an integral over a `source' term, weighted by a theory-independent `response kernel'. This leads to an efficient and accurate `plug-and-play' expression for generating growth rates in alternative gravity theories, bypassing lengthy theory-specific computations. We use this approach to explicitly show that f is sensitive to a degenerate combination of modified expansion and modified clustering effects. Hence the growth rate, when used in isolation, is not a straightforward diagnostic of modified gravity.