DSR in Galaxies - Revision history

Martinhoude at 16:37, 11 November 2018

2018-11-11T16:37:21Z

← Older revision		Revision as of 12:37, 11 November 2018
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	\|GWCounterpart = --		\|GWCounterpart = --
	\|NeutrinoCounterpart = --		\|NeutrinoCounterpart = --
	\|References = http://adsabs.harvard.edu/abs/2018MNRAS.475..514H http://adsabs.harvard.edu/abs/2018arXiv181004364H		\|References = http://adsabs.harvard.edu/abs/2018MNRAS.475..514H, http://adsabs.harvard.edu/abs/2018arXiv181004364H
	\|Comments = --		\|Comments = --
	}}		}}

Martinhoude at 02:17, 10 November 2018

2018-11-10T02:17:03Z

← Older revision		Revision as of 22:17, 9 November 2018
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	\|GWCounterpart = --		\|GWCounterpart = --
	\|NeutrinoCounterpart = --		\|NeutrinoCounterpart = --
	\|References = http://adsabs.harvard.edu/abs/2018MNRAS.475..514H ~~https~~://~~arxiv~~.~~org~~/abs/~~1810.04364~~		\|References = http://adsabs.harvard.edu/abs/2018MNRAS.475..514H http://adsabs.harvard.edu/abs/2018arXiv181004364H
	\|Comments = --		\|Comments = --
	}}		}}

Martinhoude at 02:09, 10 November 2018

2018-11-10T02:09:31Z

← Older revision		Revision as of 22:09, 9 November 2018
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	\|Type = Both		\|Type = Both
	\|EnergyMechanism = Dicke's Superradiance		\|EnergyMechanism = Dicke's Superradiance
	\|EmissionMechanism = ~~Synch.~~		\|EmissionMechanism = Spectral line
	\|LFRadioCounterpart = Yes		\|LFRadioCounterpart = Yes
	\|HFRadioCounterpart = --		\|HFRadioCounterpart = Yes
	\|MicrowaveCounterpart = --		\|MicrowaveCounterpart = --
	\|THzCounterpart = --		\|THzCounterpart = --
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	\|GWCounterpart = --		\|GWCounterpart = --
	\|NeutrinoCounterpart = --		\|NeutrinoCounterpart = --
	\|References = http://adsabs.harvard.edu/abs/2018MNRAS.475..514H		\|References = http://adsabs.harvard.edu/abs/2018MNRAS.475..514H https://arxiv.org/abs/1810.04364
	\|Comments = --		\|Comments = --
	}}		}}

Martinhoude: /* Model Description */

2018-11-10T02:07:21Z

Model Description

← Older revision		Revision as of 22:07, 9 November 2018
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	== Model Description ==		== Model Description ==

	Postulated in ~~1953~~ and first detected in 1973, Dicke's Superradiance (DSR) has been invoked as one of the few “microphysical” FRB models. The aim is to explain FRBs using ~~the atomic~~ interactions in galaxies. DSR can occur in astrophysical settings, provided: the collection of ~~atoms~~ is inverted; the velocity coherence is high; and the non-coherent relaxation mechanisms occur on a ~~timescale~~ larger than ~~the delay~~ time. ~~If one models~~ the ~~ISM~~ as a ~~cylinder~~ of ~~atoms~~, the predicted DSR emission power and ~~timescale~~ can fit FRB data. This model is additionally appealing since the DSR mechanism can adapt to a wide variety of FRB ~~behaviour~~, and proposes no new entities/physics. Indeed, the DMs associated with FRBs fits well with the ISM required for DSR to occur. DSR also presents a mechanism through which a repeater can be explained. If ~~a collection~~ of molecules ~~has~~ DSR triggered at the same time, the intrinsic variation in the DSR ~~timescale~~ and time ~~delay~~ would give the observation of bursts at different times. The variation is because the time delay is ~~an expectation value, and~~ the ~~collection~~ of ~~molecules being ionised at~~ the ~~same time is due to~~ the ~~entanglement, which also causes~~ a ~~differential~~ in ~~emission~~ time. This process can happen repeatedly as population inversion will be ~~non-inverted but swiftly~~ restored via the ~~ISM, which~~ will drive more FRB pulses, and so on. The flux distribution of such a setup can be matched to FRB 121102.		Postulated in 1954 and first detected in 1973, Dicke's Superradiance (DSR) has been invoked as one of the few “microphysical” FRB models. The aim is to explain FRBs using molecular interactions in galaxies. DSR can occur in astrophysical settings, provided: the collection of molecules is inverted; the velocity coherence is high; and the non-coherent relaxation (e.g., inelastic collisions) and dephasing (e.g., Doppler broadening) mechanisms occur on a time-scale larger than DSR time-scales. When these conditions are met, the collection of molecules become entangled (i.e., act as a unit instead of independently), which causes the rate of emission and the radiation intensity to be greatly enhanced. Assuming a cylindrical geometry for the collection of molecules partaking in a DSR event, the predicted DSR emission power and time-scale can fit FRB data. This model is additionally appealing since the DSR mechanism can adapt to a wide variety of FRB behaviours, and proposes no new entities/physics. Indeed, the DMs associated with FRBs fits well with the ISM required for DSR to occur. DSR also presents a mechanism through which a repeater can be explained. If separate collections of molecules have DSR triggered at the same time, the intrinsic variation in the DSR time-scales and time delays would give the observation of bursts at different times. The variation is because the time delay is a function of the column density of the inverted population (as well as the wavelength of radiation and the Einstein spontaneous emission coefficient) and variations in this parameter will create a distribution in the time delays and the occurence of FRBs. This process can happen repeatedly since while the population inversion will be quenched by a DSR event, it will eventually be restored via the pumping source responsible for the inversion in the first place. This will drive more FRB pulses, and so on. The flux distribution of such a setup can be matched to FRB 121102.

	== Observational Constraints ==		== Observational Constraints ==

	--		--

Jake Gordin: /* Observational Constraints */

2018-10-11T11:24:56Z

Observational Constraints

← Older revision		Revision as of 07:24, 11 October 2018
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	== Observational Constraints ==		== Observational Constraints ==

			--

Apw: /* Model Description */

2018-10-10T10:41:28Z

Model Description

← Older revision		Revision as of 06:41, 10 October 2018
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	== Model Description ==		== Model Description ==

	Postulated in 1953 and first detected in 1973, Dicke's Superradiance (DSR) has been invoked as one of the few “microphysical” FRB models. The aim is to explain FRBs using the atomic interactions in galaxies. DSR can occur in astrophysical settings, provided: the collection of atoms is inverted ~~(to wit, a majority of atoms exist in higher excited states than the minority)~~; the velocity coherence is high; and the non-coherent relaxation mechanisms occur on a timescale larger than the delay time. If one models the ISM as a cylinder of atoms, the predicted DSR emission power and timescale can fit FRB data. ~~This is because the coherent behaviour of the DSR atoms has a timescale which scales as τ ∝ N−1 and an intensity which scales as I ∝ N2, where N is the number of entangled molecules.~~ This model is additionally appealing since the DSR mechanism can adapt to a wide variety of FRB behaviour, and proposes no new entities/physics. Indeed, the DMs associated with FRBs fits well with the ISM required for DSR to occur. DSR also presents a mechanism through which a repeater can be explained. If a collection of molecules has DSR triggered at the same time, the intrinsic variation in the DSR timescale and time delay would give the observation of bursts at different times. The variation is because the time delay is an expectation value, and the collection of molecules being ionised at the same time is due to the entanglement, which also causes a differential in emission time. This process can happen repeatedly as population inversion will be non-inverted but swiftly restored via the ISM, which will drive more FRB pulses, and so on. The flux distribution of such a setup can be matched to FRB 121102.		Postulated in 1953 and first detected in 1973, Dicke's Superradiance (DSR) has been invoked as one of the few “microphysical” FRB models. The aim is to explain FRBs using the atomic interactions in galaxies. DSR can occur in astrophysical settings, provided: the collection of atoms is inverted; the velocity coherence is high; and the non-coherent relaxation mechanisms occur on a timescale larger than the delay time. If one models the ISM as a cylinder of atoms, the predicted DSR emission power and timescale can fit FRB data. This model is additionally appealing since the DSR mechanism can adapt to a wide variety of FRB behaviour, and proposes no new entities/physics. Indeed, the DMs associated with FRBs fits well with the ISM required for DSR to occur. DSR also presents a mechanism through which a repeater can be explained. If a collection of molecules has DSR triggered at the same time, the intrinsic variation in the DSR timescale and time delay would give the observation of bursts at different times. The variation is because the time delay is an expectation value, and the collection of molecules being ionised at the same time is due to the entanglement, which also causes a differential in emission time. This process can happen repeatedly as population inversion will be non-inverted but swiftly restored via the ISM, which will drive more FRB pulses, and so on. The flux distribution of such a setup can be matched to FRB 121102.

	== Observational Constraints ==		== Observational Constraints ==

Apw at 10:39, 10 October 2018

2018-10-10T10:39:05Z

← Older revision		Revision as of 06:39, 10 October 2018
Line 24:		Line 24:
	== Model Description ==		== Model Description ==

	To be ~~filled~~ in ~~with updated draft~~		Postulated in 1953 and first detected in 1973, Dicke's Superradiance (DSR) has been invoked as one of the few “microphysical” FRB models. The aim is to explain FRBs using the atomic interactions in galaxies. DSR can occur in astrophysical settings, provided: the collection of atoms is inverted (to wit, a majority of atoms exist in higher excited states than the minority); the velocity coherence is high; and the non-coherent relaxation mechanisms occur on a timescale larger than the delay time. If one models the ISM as a cylinder of atoms, the predicted DSR emission power and timescale can fit FRB data. This is because the coherent behaviour of the DSR atoms has a timescale which scales as τ ∝ N−1 and an intensity which scales as I ∝ N2, where N is the number of entangled molecules. This model is additionally appealing since the DSR mechanism can adapt to a wide variety of FRB behaviour, and proposes no new entities/physics. Indeed, the DMs associated with FRBs fits well with the ISM required for DSR to occur. DSR also presents a mechanism through which a repeater can be explained. If a collection of molecules has DSR triggered at the same time, the intrinsic variation in the DSR timescale and time delay would give the observation of bursts at different times. The variation is because the time delay is an expectation value, and the collection of molecules being ionised at the same time is due to the entanglement, which also causes a differential in emission time. This process can happen repeatedly as population inversion will be non-inverted but swiftly restored via the ISM, which will drive more FRB pulses, and so on. The flux distribution of such a setup can be matched to FRB 121102.

	== Observational Constraints ==		== Observational Constraints ==

	~~To be filled in with updated draft~~

Emma Platts: Created page with " {{FRBTableTemplate |Category = Other |Pro..."

2018-10-02T14:46:07Z

Created page with "   {{FRBTableTemplate |Category = Other |Pro..."

New page

{{FRBTableTemplate
|Category = Other
|Progenitor = Dicke's Superradiance in Galaxies
|Type = Both
|EnergyMechanism = Dicke's Superradiance
|EmissionMechanism = Synch.
|LFRadioCounterpart = Yes
|HFRadioCounterpart = --
|MicrowaveCounterpart = --
|THzCounterpart = --
|OIRCounterpart = --
|XrayCounterpart = --
|GammarayCounterpart = --
|GWCounterpart = --
|NeutrinoCounterpart = --
|References = http://adsabs.harvard.edu/abs/2018MNRAS.475..514H
|Comments = --
}}

== Model Description ==

To be filled in with updated draft

== Observational Constraints ==

To be filled in with updated draft