Zobrazeno 1 - 10
of 62
pro vyhledávání: '"Gratton, Steven"'
Motivated by observed discrepancies between ACT DR4 and Planck 2018 cosmic microwave background (CMB) anisotropy power spectra, particularly in the cross-correlation of temperature and E-mode polarization, we investigate challenges that may be encoun
Externí odkaz:
http://arxiv.org/abs/2412.13995
We present constraints on primordial B modes from large angular scale cosmic microwave background polarisation anisotropies measured with the Planck satellite. To remove Galactic polarised foregrounds, we use a Bayesian parametric component separatio
Externí odkaz:
http://arxiv.org/abs/2207.04903
We present a Bayesian parametric component separation method for polarised microwave sky maps. We solve jointly for the primary cosmic microwave background (CMB) signal and the main Galactic polarised foreground components. For the latter, we conside
Externí odkaz:
http://arxiv.org/abs/2205.13968
Publikováno v:
MNRAS 517 (2022) 4620-4636
We present angular power spectra and cosmological parameter constraints derived from the Planck PR4 (NPIPE) maps of the Cosmic Microwave Background. NPIPE, released by the Planck Collaboration in 2020, is a new processing pipeline for producing calib
Externí odkaz:
http://arxiv.org/abs/2205.10869
Publikováno v:
MNRAS 507, 1072-1091 (2021)
This paper explores methods for constructing low multipole temperature and polarisation likelihoods from maps of the cosmic microwave background anisotropies that have complex noise properties and partial sky coverage. We use Planck 2018 High Frequen
Externí odkaz:
http://arxiv.org/abs/2103.14378
Autor:
Gratton, Steven
In this paper I show how path integral techniques can be used to put measures on histories in "susceptible-infectious-recovered" (SIR)-type systems. The standard SIR solution emerges as the classical saddle point of the action describing the measure.
Externí odkaz:
http://arxiv.org/abs/2006.01817
Autor:
Efstathiou, George, Gratton, Steven
We revisit the observational constraints on spatial curvature following recent claims that the Planck data favour a closed Universe. We use a new and statistically powerful Planck likelihood to show that the Planck temperature and polarization spectr
Externí odkaz:
http://arxiv.org/abs/2002.06892
Autor:
Gratton, Steven, Challinor, Anthony
We provide an analytical argument for understanding the likely nature of parameter shifts between those coming from an analysis of a dataset and from a subset of that dataset, assuming differences are down to noise and any intrinsic variance alone. T
Externí odkaz:
http://arxiv.org/abs/1911.07754
Autor:
Efstathiou, George, Gratton, Steven
This paper presents a detailed description of the CamSpec likelihood which has been used to analyse Planck temperature and polarization maps of the cosmic microwave background since the first Planck data release. We have created a number of likelihoo
Externí odkaz:
http://arxiv.org/abs/1910.00483
Autor:
Gratton, Steven
We investigate the applicability of the formalism of quantum mechanics to everyday life. It seems to be directly relevant for situations in which the very act of coming to a conclusion or decision on one issue affects one's confidence about conclusio
Externí odkaz:
http://arxiv.org/abs/1811.04760