The longitudinal plasma modes in mDM-plasma system

Xiong, Yu-Zhen; Chen, Hui; Liu, S. Q.

doi:10.1063/5.0050112

Cited by 2 publications

(4 citation statements)

References 38 publications

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“…We consider plasma streaming instabilities that would act to couple the momentum of the DM to either the gas or to the DM itself. Streaming instabilities have been previously considered for mDM in [1,[19][20][21][22]. When DM is millicharged, electrostatic instabilities, or instabilities with any significant longitudinal component, are highly Landau damped owing to the streaming velocity (and hence the phase velocity of the excited Langmuir waves) being not much larger than the particle velocity dispersions for the cosmological situations of interest [22].…”

Section: Jcap04(2023)028mentioning

confidence: 99%

“…Streaming instabilities have been previously considered for mDM in [1,[19][20][21][22]. When DM is millicharged, electrostatic instabilities, or instabilities with any significant longitudinal component, are highly Landau damped owing to the streaming velocity (and hence the phase velocity of the excited Langmuir waves) being not much larger than the particle velocity dispersions for the cosmological situations of interest [22]. Thus, electromagnetic instabilities are the most promising when dark matter is millicharged.…”

Section: Jcap04(2023)028mentioning

confidence: 99%

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Astrophysical plasma instabilities induced by long-range interacting dark matter

Cruz

McQuinn

2023

J. Cosmol. Astropart. Phys.

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If dark matter is millicharged or darkly charged, collective plasma processes may dominate momentum exchange over direct particle collisions. In particular, plasma streaming instabilities can couple the momentum of the dark matter to counter-streaming baryons or other dark matter and result in the counter-streaming fluids coming to rest with each other, just as happens for baryonic collisionless shocks in astrophysical systems. While electrostatic plasma instabilites (such as the two-stream) are highly suppressed by Landau damping when dark matter is millicharged, in the cosmological situations of interest, electromagnetic instabilities such as the Weibel can couple the momenta, assuming that the linear instability saturates in the manner typically found for baryonic plasmas. We find that the streaming of dark matter in the pre-Recombination universe is affected more strongly by direct collisions than collective processes, validating previous constraints. However, when considering unmagnetized instabilities the properties of the Bullet Cluster merger and other merging cluster systems (which show dark matter streaming through itself) are likely to be substantially altered if [qχ /mχ ] ≳ 10-4, where [qχ /mχ ] is the charge-to-mass ratio of the dark matter relative to that of the proton. When a magnetic field is added consistent with cluster observations, the Weibel and Firehose instabilities result in sufficiently fast growth to reach saturation for [qχ /mχ ] ≳ 10-12–10-11. The Weibel growth rates are even faster in the case of a dark-U(1) charge (because “hot” electrons do not damp the instability), potentially ruling out [qχ /mχ ] ≳ 10-14 in the Bullet Cluster system, in agreement with [1]. The strongest previous limits on millicharged dark matter (mDM) arise from considering the spin-down of galactic disks [2]. We show that plasma instabilities or tangled background magnetic fields could lead to diffusive propagation of the dark matter, weakening these spin-down limits. Thus, plasma instabilities may place some of the most stringent constraints over much of the millicharged, and our results corroborate previous extremely stringent potential constraints on the dark-charged parameter space.

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Section: Jcap04(2023)028mentioning

confidence: 99%

Section: Jcap04(2023)028mentioning

confidence: 99%

Astrophysical plasma instabilities induced by long-range interacting dark matter

Cruz

McQuinn

2023

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

“…We consider plasma streaming instabilities that would act to couple the momentum of the dark matter to either the gas or to the dark matter itself. Streaming instabilities have been previously considered for mDM in [19][20][21][22][23]. Electrostatic instabilities, or instabilities with any significant longitudinal component, are highly Landau damped owing to the streaming velocity (and hence the phase velocity of the excited Langmuir waves) being not much larger than the particle velocity dispersions for the cosmological situations of interest [23].…”

Section: Introductionmentioning

confidence: 99%

“…Streaming instabilities have been previously considered for mDM in [19][20][21][22][23]. Electrostatic instabilities, or instabilities with any significant longitudinal component, are highly Landau damped owing to the streaming velocity (and hence the phase velocity of the excited Langmuir waves) being not much larger than the particle velocity dispersions for the cosmological situations of interest [23]. Thus, electromagnetic instabilities are the most promising.…”

Section: Introductionmentioning

confidence: 99%

Astrophysical Plasma Instabilities induced by Long-Range Interacting Dark Matter

Cruz¹,

McQuinn²

2022

Preprint

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If dark matter is millicharged or darkly charged, collective plasma processes may dominate momentum exchange over direct particle collisions. In particular, plasma streaming instabilities can couple the momentum of the dark matter to counter-streaming baryons or other dark matter and result in the counter-streaming fluids coming to rest with each other, just as happens for baryonic collisionless shocks in astrophysical systems. While electrostatic plasma instabilites (such as the two stream) are highly suppressed by Landau damping in the cosmological situations of interest, electromagnetic instabilities such as the Weibel can couple the momenta. Their growth rates are slower than the prior assumption that they would grow at the plasma frequency of the dark matter. We find that the streaming of dark matter in the pre-Recombination universe is affected more strongly by direct collisions than collective processes, validating previous constraints. However, when considering unmagnetized instabilities the properties of the Bullet Cluster merger and other merging cluster systems (which show dark matter streaming through itself) would be substantially altered if [q χ /m χ ] 10 −4 , where [q χ /m χ ] is the charge-to-mass ratio of the dark matter relative to that of the proton. When a magnetic field is added consistent with cluster observations, both the Weibel and Firehose instabilities result in the constraint [q χ /m χ ] 10 −12 − 10 −11 . The constraints are even stronger in the case of a dark U (1) charge (because "hot" electrons do not damp the instability), ruling out [q χ /m χ ] 10 −14 in the Bullet Cluster system. The strongest previous limits on millicharged dark matter (mDM) arise from considering the spin down of galactic disks [1]. We show that plasma instabilities or tangled background magnetic fields could lead to diffusive propagation of the dark matter, weakening these spin down limits. Thus, our constraints from considering plasma instabilities are the most stringent over much of the millicharged and especially dark-charged parameter space.

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The longitudinal plasma modes in mDM-plasma system

Cited by 2 publications

References 38 publications

Astrophysical plasma instabilities induced by long-range interacting dark matter

Astrophysical plasma instabilities induced by long-range interacting dark matter

Astrophysical Plasma Instabilities induced by Long-Range Interacting Dark Matter

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