scholarly journals INFLATION, QUANTUM FIELDS, AND CMB ANISOTROPIES

2009 ◽  
Vol 18 (14) ◽  
pp. 2329-2335 ◽  
Author(s):  
IVÁN AGULLÓ ◽  
JOSÉ NAVARRO-SALAS ◽  
GONZALO J. OLMO ◽  
LEONARD PARKER
Keyword(s):  
Cosmic Microwave Background ◽  
Gravitational Waves ◽  
Early Universe ◽  
Inflationary Cosmology ◽  
Quantum Field ◽  
Quantum Fields ◽  
Microwave Background ◽  
Cosmological Inflation ◽  
Near Future ◽  
Field Renormalization

Inflationary cosmology has proven to be the most successful at predicting the properties of the anisotropies observed in the cosmic microwave background (CMB). In this essay we show that quantum field renormalization significantly influences the generation of primordial perturbations and hence the expected measurable imprint of cosmological inflation on the CMB. However, the new predictions remain in agreement with observation, and in fact favor the simplest forms of inflation. In the near future, observations of the influence of gravitational waves from the early universe on the CMB will test our new predictions.

scholarly journals Status of the GroundBIRD Telescope

2018 ◽  
Vol 168 ◽  
pp. 01014
Author(s):  
J. Choi ◽  
R. Génova-Santos ◽  
M. Hattori ◽  
M. Hazumi ◽  
H. Ishitsuka ◽  
...  
Keyword(s):  
Cosmic Microwave Background ◽  
Early Universe ◽  
Present Status ◽  
Big Bang ◽  
Inflationary Cosmology ◽  
Polarization Pattern ◽  
Microwave Background ◽  
Systematic Effects ◽  
The Big Bang

Our understanding of physics at very early Universe, as early as 10−35 s after the Big Bang, relies on the scenario known as the inflationary cosmology. Inflation predicts a particular polarization pattern in the cosmic microwave background, known as the B-mode yet the strength of such polarization pattern is extremely weak. To search for the B-mode of the polarization in the cosmic microwave background, we are constructing an off-axis rotating telescope to mitigate systematic effects as well as to maximize the sky coverage of the observation. We will discuss the present status of the GroundBIRD telescope.

THE POLARIZATION OF THE COSMIC MICROWAVE BACKGROUND DUE TO PRIMORDIAL GRAVITATIONAL WAVES

2006 ◽  
Vol 21 (12) ◽  
pp. 2459-2479 ◽  
Author(s):  
BRIAN G. KEATING ◽  
ALEXANDER G. POLNAREV ◽  
NATHAN J. MILLER ◽  
DEEPAK BASKARAN
Keyword(s):  
Cosmic Microwave Background ◽  
Gravitational Wave ◽  
Gravitational Waves ◽  
Microwave Background ◽  
Primordial Gravitational Waves ◽  
Cmb Polarization ◽  
Cosmological Inflation ◽  
Gravitational Wave Background ◽  
Review Current ◽  
Rule Out

We review current observational constraints on the polarization of the Cosmic Microwave Background (CMB), with a particular emphasis on detecting the signature of primordial gravitational waves. We present an analytic solution to the Polanarev approximation for CMB polarization produced by primordial gravitational waves. This simplifies the calculation of the curl, or B-mode power spectrum associated with gravitational waves during the epoch of cosmological inflation. We compare our analytic method to existing numerical methods and also make predictions for the sensitivity of upcoming CMB polarization observations to the inflationary gravitational wave background. We show that upcoming experiments should be able either detect the relic gravitational wave background or completely rule out whole classes of inflationary models.

scholarly journals DIRECT DETECTION OF THE PRIMORDIAL INFLATIONARY GRAVITATIONAL WAVES

2009 ◽  
Vol 18 (14) ◽  
pp. 2195-2199 ◽  
Author(s):  
WEI-TOU NI
Keyword(s):  
Cosmic Microwave Background ◽  
Gravitational Waves ◽  
Direct Observation ◽  
Technology Development ◽  
Direct Detection ◽  
Energy Scale ◽  
Experimental Confirmation ◽  
Inflationary Cosmology ◽  
Microwave Background ◽  
Mode Effects

Inflationary cosmology is successful in explaining a number of outstanding cosmological issues, including the flatness, the horizon and the relic issues. More spectacular is the experimental confirmation of the structure as arising from the inflationary quantum fluctuations. However, the physics in the inflationary era is unclear. Polarization observations of cosmic microwave background (CMB) missions may detect the tensor mode effects of inflationary gravitational waves (GWs) and give an energy scale of inflation. To probe the inflationary physics, direct observation of GWs generated in the inflationary era is needed. In this essay, we advocate that the direct observation of these GWs with sensitivity down to Ω GW ~ 10-23 is possible using the presently projected technology development if the foreground could be separated.

scholarly journals CMB anisotropy science: a review

2012 ◽  
Vol 8 (S288) ◽  
pp. 42-52 ◽  
Author(s):  
Anthony Challinor
Keyword(s):  
Dark Matter ◽  
Cosmological Model ◽  
Cosmic Microwave Background ◽  
Gravitational Waves ◽  
Early Universe ◽  
Critical Role ◽  
Microwave Background ◽  
Fundamental Physics ◽  
Standard Cosmological Model

AbstractThe cosmic microwave background (CMB) provides us with our most direct observational window to the early universe. Observations of the temperature and polarization anisotropies in the CMB have played a critical role in defining the now-standard cosmological model. In this contribution we review some of the basics of CMB science, highlighting the role of observations made with ground-based and balloon-borne Antarctic telescopes. Most of the ingredients of the standard cosmological model are poorly understood in terms of fundamental physics. We discuss how current and future CMB observations can address some of these issues, focusing on two directly relevant for Antarctic programmes: searching for gravitational waves from inflation via B-mode polarization, and mapping dark matter through CMB lensing.

scholarly journals PROPOSED OBSERVATIONS OF GRAVITATIONAL WAVES FROM THE EARLY UNIVERSE VIA "MILLIKAN OIL DROPS"

2007 ◽  
Vol 16 (12a) ◽  
pp. 2309-2318 ◽  
Author(s):  
RAYMOND Y. CHIAO
Keyword(s):  
Cosmic Microwave Background ◽  
Gravitational Wave ◽  
Gravitational Waves ◽  
Early Universe ◽  
Superfluid Helium ◽  
Magnetic Trap ◽  
Microwave Background ◽  
Planck Mass

Pairs of Planck-mass drops of superfluid helium coated by electrons (i.e. "Millikan oil drops"), when levitated in a superconducting magnetic trap, can be efficient quantum transducers between electromagnetic (EM) and gravitational (GR) radiation. This leads to the possibility of a Hertz-like experiment, in which EM waves are converted at the source into GR waves, and then back-converted at the receiver from GR waves into EM waves. Detection of the gravitational-wave analog of the cosmic microwave background using these drops can discriminate between various theories of the early Universe.

Dust

2015 ◽  
Vol 1 (3) ◽  
Author(s):  
Umberto Cannella
Keyword(s):  
Cosmic Microwave Background ◽  
Gravitational Waves ◽  
Microwave Background

Astrophysicists search the cosmic microwave background for B-mode polarization. Sometimes they get overexcited. Gravitational waves discovered? Or not. Umberto Cannella takes a look at the Background Imaging of Cosmic Extragalactic Polarization (BICEP2) experiment.

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