Results 21 to 30 of about 4,402,515 (251)

Effects of cosmological model assumptions on galaxy redshift survey measurements [PDF]

, 2010
The clustering of galaxies observed in future redshift surveys will provide a wealth of cosmological information. Matching the signal at different redshifts constrains the dark energy driving the acceleration of the expansion of the Universe.
Cimatti, A., Samushia, Lado, James E. Geach, Geach, J.E., Percival, W.J., Orsi, A., Lacey, Cedric, Orsi, Alvaro, Baugh, Carlton M., Luigi Guzzo, Samushia, L., Guzzo, L., Guzzo, Luigi, Cedric Lacey, Lado Samushia, Percival, Will J., Baugh, C., Mukherjee, P., Pia Mukherjee, Majerotto, Elisabetta, Geach, James E., Cimatti, Andrea, Lacey, C., Andrea Cimatti, Alvaro Orsi, Mukherjee, Pia, Yun Wang, Will J. Percival, Majerotto, E., Baugh, Carlton, Carlton Baugh, Wang, Yun, Wang, Y., Elisabetta Majerotto   +33 more
core   +1 more source

Measuring cosmological parameters [PDF]

Proceedings of the National Academy of Sciences, 1998
In this review, the status of measurements of the matter density (Ω m ), the vacuum energy density or cosmological constant (Ω Λ ), the Hubble constant ( H 0 ), and the ages of the oldest ...
openaire   +3 more sources

Cosmological parameter estimation and the inflationary cosmology [PDF]

Physical Review D, 2002
15 pages RevTeX file with figures incorporated. Slow-roll inflation module for use with the CAMB program can be found at http://astronomy.cpes.susx.ac.uk/~sleach/inflation/ This version corrects a typo in the definition of z_S (after Eq.1) and supersedes the journal ...
Leach, SM, Liddle, AR, Martin, J, Schwarz, Dominik   +3 more
openaire   +2 more sources

On algebraic dependence of cosmological parameters [PDF]

Gravitation and Cosmology, 2020
We show that the inverse function of the scale factor a(t) can be represented as an elliptic integral with a parameter. Using algebraic dependencies between cosmological parameters and the obtained inverse function formula, we compute in a uniform way some special events in the universe’s evolution.
Mijajlović, Žarko, Branković, Danijela   +1 more
openaire   +2 more sources

The Atacama Cosmology Telescope: DR4 maps and cosmological parameters [PDF]

Journal of Cosmology and Astroparticle Physics, 2020
We present new arcminute-resolution maps of the Cosmic Microwave Background temperature and polarization anisotropy from the Atacama Cosmology Telescope, using data taken from 2013–2016 at 98 and 150 GHz. The maps cover more than 17,000 deg2, the deepest 600 deg2with noise levels below 10μK-arcmin.
Aiola, Simone, Calabrese, Erminia, Maurin, Loïc, Naess, Sigurd, Schmitt, Benjamin L., Abitbol, Maximilian H., Addison, Graeme E., Ade, Peter A.R., Alonso, David, Amiri, Mandana, Amodeo, Stefania, Angile, Elio, Austermann, Jason E., Baildon, Taylor, Battaglia, Nick, Beall, James A., Bean, Rachel, Becker, Daniel T., Bond, J.Richard, Bruno, Sarah Marie, Calafut, Victoria, Campusano, Luis E., Carrero, Felipe, Chesmore, Grace E., Cho, Hsiao-Mei, Choi, Steve K., Clark, Susan E., Cothard, Nicholas F., Crichton, Devin, Crowley, Kevin T., Darwish, Omar, Datta, Rahul, Denison, Edward V., Devlin, Mark J., Duell, Cody J., Duff, Shannon M., Duivenvoorden, Adriaan J., Dunkley, Jo, Dünner, Rolando, Essinger-Hileman, Thomas, Fankhanel, Max, Ferraro, Simone, Fox, Anna E., Fuzia, Brittany, Gallardo, Patricio A., Gluscevic, Vera, Golec, Joseph E., Grace, Emily, Gralla, Megan, Guan, Yilun, Hall, Kirsten, Halpern, Mark, Han, Dongwon, Hargrave, Peter, Hasselfield, Matthew, Helton, Jakob M., Henderson, Shawn, Hensley, Brandon, Colin Hill, J., Hilton, Gene C., Hilton, Matt, Hincks, Adam D., Hložek, Renée, Ho, Shuay-Pwu Patty, Hubmayr, Johannes, Huffenberger, Kevin M., Hughes, John P., Infante, Leopoldo, Irwin, Kent, Jackson, Rebecca, Klein, Jeff, Knowles, Kenda, Koopman, Brian, Kosowsky, Arthur, Lakey, Vincent, Li, Dale, Li, Yaqiong, Li, Zack, Lokken, Martine, Louis, Thibaut, Lungu, Marius, Macinnis, Amanda, Madhavacheril, Mathew, Maldonado, Felipe, Mallaby-Kay, Maya, Marsden, Danica, Mcmahon, Jeff, Menanteau, Felipe, Moodley, Kavilan, Morton, Tim, Namikawa, Toshiya, Nati, Federico, Newburgh, Laura, Nibarger, John P., Nicola, Andrina, Niemack, Michael D., Nolta, Michael R., Orlowski-Sherer, John, Page, Lyman A., Pappas, Christine G., Partridge, Bruce, Phakathi, Phumlani, Pisano, Giampaolo, Prince, Heather, Puddu, Roberto, Qu, Frank J., Rivera, Jesus, Robertson, Naomi, Rojas, Felipe, Salatino, Maria, Schaan, Emmanuel, Schillaci, Alessandro, Sehgal, Neelima, Sherwin, Blake D., Sierra, Carlos, Sievers, Jon, Sifon, Cristobal, Sikhosana, Precious, Simon, Sara, Spergel, David N., Staggs, Suzanne T., Stevens, Jason, Storer, Emilie, Sunder, Dhaneshwar D., Switzer, Eric R., Thorne, Ben, Thornton, Robert, Trac, Hy, Treu, Jesse, Tucker, Carole, Vale, Leila R., van Engelen, Alexander, van Lanen, Jeff, Vavagiakis, Eve M., Wagoner, Kasey, Wang, Yuhan, Ward, Jonathan T., Wollack, Edward J., Xu, Zhilei, Zago, Fernando, Zhu, Ningfeng   +140 more
openaire   +9 more sources

Unified Dark Matter models with fast transition [PDF]

, 2010
We investigate the general properties of Unified Dark Matter (UDM) fluid models where the pressure and the energy density are linked by a barotropic equation of state (EoS) p = p(ρ) and the perturbations are adiabatic.
Davide Pietrobon, Bruni, Marco, Bertacca, Daniele, Oliver F Piattella, Piattella, Oliver F., Piattella, O., Pietrobon, Davide, D. PIETROBON, Marco Bruni, PIATTELLA O, D. BERTACCA, M. BRUNI, Daniele Bertacca   +12 more
core   +1 more source

Probing Cosmological Parameters with GRBs [PDF]

AIP Conference Proceedings, 2004
In light of the recent finding of the narrow clustering of the geometrically-corrected gamma-ray energies emitted by Gamma Ray Bursts (GRBs), we investigate the possibility to use these sources as standard candles to probe cosmological parameters such as the matter density Omega_m and the cosmological constant energy density Omega_Lambda. By simulating
Di Girolamo, T., Vietri, M., Di Sciascio, G.   +2 more
openaire   +2 more sources

Applications of cosmological perturbation theory [PDF]

, 2011
PhDCosmological perturbation theory is crucial for our understanding of the universe. The linear theory has been well understood for some time, however developing and applying the theory beyond linear order is currently at the forefront of research in
Christopherson, Adam J.
core   +4 more sources

Estimating cosmological parameter covariance [PDF]

Monthly Notices of the Royal Astronomical Society, 2014
We investigate the bias and error in estimates of the cosmological parameter covariance matrix, due to sampling or modelling the data covariance matrix, for likelihood width and peak scatter estimators. We show that these estimators do not coincide unless the data covariance is exactly known. For sampled data covariances, with Gaussian distributed data
Taylor, Andy, Joachimi, Benjamin
openaire   +2 more sources

Baryon Physics and Tight Coupling Approximation in Boltzmann Codes

Universe, 2019
We provide two derivations of the baryonic equations that can be straightforwardly implemented in existing Einstein−Boltzmann solvers. One of the derivations begins with an action principle, while the other exploits the conservation of the stress ...
Masroor C. Pookkillath, Antonio De Felice, Shinji Mukohyama   +2 more
doaj   +1 more source