Results 61 to 70 of about 256,877 (297)
Cosmic Microwave Background from Effective Field Theory
Universe, 2019 In this work, we study the key role of generic Effective Field Theory (EFT) framework to quantify the correlation functions in a quasi de Sitter background for an arbitrary initial choice of the quantum vacuum state. We perform the computation in unitary
Sayantan Choudhury
doaj +1 more source
General constraints on dark matter decay from the cosmic microwave background [PDF]
, 2016 Precise measurements of the temperature and polarization anisotropies of the cosmic microwave background can be used to constrain the annihilation and decay of dark matter. In this work, we demonstrate via principal component analysis that the imprint of
T. Slatyer, Chih-Liang Wu
semanticscholar +1 more source
Heating of the intergalactic medium by the cosmic microwave background during cosmic dawn [PDF]
Physical Review D, 2018 The intergalactic medium is expected to be at its coldest point before the formation of the first stars in the universe. Motivated by recent results from the EDGES experiment, we revisit the standard calculation of the kinetic temperature of the neutral ...
T. Venumadhav +3 more
semanticscholar +1 more source
Polarization in the cosmic microwave background [PDF]
Brazilian Journal of Physics, 2006 Cosmic microwave background (CMB) studies underpin our understanding of the universe and its history. Until recently, we have relied principally on CMB temperature observations to build our standard cosmological model, but today the field forges ahead into its next frontier - CMB polarization anistropy.
openaire +6 more sources
Probing decoupling in dark sectors with the cosmic microwave background [PDF]
Journal of Cosmology and Astroparticle Physics, 2018 The acoustic peaks in the angular power spectrum of cosmic microwave background (CMB) temperature and polarization anisotropies play an important role as a probe of the nature of new relativistic particles contributing to the radiation density in the ...
Gongjun Choi +2 more
semanticscholar +1 more source
Mosaicking with cosmic microwave background interferometers [PDF]
, 2006 Measurements of cosmic microwave background (CMB) anisotropies by interferometers offer several advantages over single-dish observations. The formalism for analyzing interferometer CMB data is well developed in the flat-sky approximation, valid for small
Cornwell T. J. +8 more
core +3 more sources
Using the Full Power of the Cosmic Microwave Background to Probe Axion Dark Matter [PDF]
, 2017 The cosmic microwave background (CMB) places strong constraints on models of dark matter (DM) that deviate from standard cold DM (CDM), and on initial conditions beyond the scalar adiabatic mode.
R. Hložek, D. Marsh, D. Grin
semanticscholar +1 more source
Unexpected topology of the temperature fluctuations in the cosmic microwave background [PDF]
Astronomy & Astrophysics, 2018 We study the topology generated by the temperature fluctuations of the cosmic microwave background (CMB) radiation, as quantified by the number of components and holes, formally given by the Betti numbers, in the growing excursion sets.
Pratyush Pranav +7 more
semanticscholar +1 more source
POLAR: Instrument and Results [PDF]
, 2002 We describe the design, performance, and results of a polarimeter used to make precision measurements of the 2.7 K cosmic microwave background. In the Spring of 2000 the instrument searched for polarized emission in three microwave frequency bands ...
de Oliveira-Costa, Angelica +6 more
core +1 more source
Observing Dirac neutrinos in the cosmic microwave background [PDF]
Physical Review D, 2019 Planned CMB Stage IV experiments have the potential to measure the effective number of relativistic degrees of freedom in the early Universe, $N_\text{eff}$, with percent-level accuracy.
K. Abazajian, J. Heeck
semanticscholar +1 more source