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 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.

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.

scholarly journals Measuring the scalar induced gravitational waves from observations

2021 ◽  
Vol 81 (7) ◽  
Author(s):  
Jun Li ◽  
Guang-Hai Guo
Keyword(s):  
Power Spectrum ◽  
Cosmic Microwave Background ◽  
Gravitational Wave ◽  
Gravitational Waves ◽  
Cosmological Parameters ◽  
Numerical Results ◽  
Microwave Background ◽  
High Frequencies ◽  
Special Cases ◽  
Relic Density

AbstractWe consider the scalar induced gravitational waves from the cosmic microwave background (CMB) observations and the gravitational wave observations. In the $$\Lambda $$ Λ CDM+r model, we constrain the cosmological parameters within the evolution of the scalar induced gravitational waves by the additional scalar power spectrum. The two special cases called narrow power spectrum and wide power spectrum have influence on the cosmological parameters, especially the combinations of Planck18+BAO+BK15+LISA. We also compare these numerical results from four datasets within LIGO, LISA, IPTA and FAST projects, respectively. The constraints from FAST have a significant impact on tensor-to-scalar ratio. Besides, we only consider the relic density of induced gravitational waves with respect to different frequencies from CMB scale to high frequencies including the range of LIGO and LISA.

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