R. H. Dicke, P. J. E. Peebles, P. G. Roll and D. T. Wilkinson

Dicke, R. H.; Peebles, Patrick; Roll, P. G.; Wilkinson, D. T.

doi:10.2307/j.ctvcm4h07.86

Cited by 37 publications

(63 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The CMB was observed for the first time, albeit accidentally, in 1964 (when the age of the universe was 13.8 billion years [44,53,102]) by Arno Penzias and Robert Wilson of Bell Laboratories, in New Jersey, USA [103]. The explanation of the cosmological origin of the observation was published simultaneously [104], although the existence of the CMB had been predicted before [105]. The CMB is observed today to have a perfect black body temperature distribution corresponding to 2.726 K [106,107].…”

Section: Inflationmentioning

confidence: 99%

Stochastic gravitational wave backgrounds

Christensen¹

2018

Rep. Prog. Phys.

275

192

View full text Add to dashboard Cite

A stochastic background of gravitational waves can be created by the superposition of a large number of independent sources. The physical processes occurring at the earliest moments of the universe certainly created a stochastic background that exists, at some level, today. This is analogous to the cosmic microwave background, which is an electromagnetic record of the early universe. The recent observations of gravitational waves by the Advanced LIGO and Advanced Virgo detectors imply that there is also a stochastic background that has been created by binary black hole and binary neutron star mergers over the history of the universe. Whether the stochastic background is observed directly, or upper limits placed on it in specific frequency bands, important astrophysical and cosmological statements about it can be made. This review will summarize the current state of research of the stochastic background, from the sources of these gravitational waves, to the current methods used to observe them.

show abstract

Section: Inflationmentioning

confidence: 99%

Stochastic gravitational wave backgrounds

Christensen¹

2018

Rep. Prog. Phys.

275

192

View full text Add to dashboard Cite

show abstract

“…In contrast, with SR emitters act as a unit through the establishment of entangled states and the radiation rates are significantly enhanced. As a result, the radiation intensity at maximum scales with the square of the number of emitters (I SR ∝ N 2 ) (Dicke 1954(Dicke , 1964. SR therefore proves a more efficient mechanism to release the energy stored in an inverted medium through strong bursts of radiation over a variety of time-scales.…”

Section: Introductionmentioning

confidence: 99%

New evidence for Dicke’s superradiance in the 6.7 GHz methanol spectral line in the interstellar medium

Rajabi

Houde

Bartkiewicz

et al. 2019

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

We present new evidence for superradiance in the methanol 6.7 GHz spectral line for three different star-forming regions: S255IR-NIRS3, G24.329+0.144, and Cepheus A. Our analysis shows that some of the flux-density flares exhibiting fast rise times and asymmetric light curves reported in these sources can naturally be explained within the context of superradiance. When a threshold for the inverted population column density is exceeded in a maser-hosting region, the radiation mode switches from one regulated by stimulated emission (maser) to superradiance. Superradiance, as a more efficient energy release mechanism, manifests itself through strong bursts of radiation emanating from spatially compact regions. Elevated inverted population densities and the initiation of superradiance can be due to a change in radiative pumping. Here, we show that an increase in the pump rate and the inverted population density of only a factor of a few results in a significant increase in radiation. While the changes in the pump rate can take place over a few hundred days, the rise in radiation flux density when superradiance is initiated is drastic and happens over a much shorter time-scale.

show abstract

“…SR is a quantum phenomenon where a group of molecules (or atoms) become entangled through interactions with their common electromagnetic field (Dicke 1954(Dicke , 1964Gross & Haroche 1982). As a result molecules contained within a gas act as a unit, as opposed to independent entities, and behave cooperatively in a manner that strongly affects the characteristics of the gas and the radiation emanating from it.…”

Section: Introductionmentioning

confidence: 99%

Triggered superradiance and fast radio bursts

Houde

Rajabi

Gaensler

et al. 2018

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

In this paper we develop a model for fast radio bursts (FRBs) based on triggered superradiance (SR) and apply it to previously published data of FRB 110220 and FRB 121102. We show how a young pulsar located at ∼ 100 pc or more from an SR/FRB system could initiate the onset of a powerful burst of radiation detectable over cosmological distances. Our models using the OH 2 Π 3/2 (J = 3/2) 1612 MHz and 2 Π 3/2 (J = 5/2) 6030 MHz spectral lines match the light curves well and suggest the entanglement of more than 10 30 initially inverted molecules over lengths of approximately 300 au for a single SR sample. SR also accounts for the observed temporal narrowing of FRB pulses with increasing frequency for FRB 121102, and predicts a scaling of the FRB spectral bandwidth with the frequency of observation, which we found to be consistent with the existing data.

show abstract

R. H. Dicke, P. J. E. Peebles, P. G. Roll and D. T. Wilkinson

Cited by 37 publications

References 0 publications

Stochastic gravitational wave backgrounds

Stochastic gravitational wave backgrounds

New evidence for Dicke’s superradiance in the 6.7 GHz methanol spectral line in the interstellar medium

Triggered superradiance and fast radio bursts

Contact Info

Product

Resources

About