Reproductive freeze-in of self-interacting dark matter. / March-Russell, John ; Tillim, Hannah; West, Stephen.

In: Physical Review D, Vol. 102, No. 8, 083018, 19.10.2020, p. 1-11.

Research output: Contribution to journalArticlepeer-review

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Reproductive freeze-in of self-interacting dark matter. / March-Russell, John ; Tillim, Hannah; West, Stephen.

In: Physical Review D, Vol. 102, No. 8, 083018, 19.10.2020, p. 1-11.

Research output: Contribution to journalArticlepeer-review

Harvard

March-Russell, J, Tillim, H & West, S 2020, 'Reproductive freeze-in of self-interacting dark matter', Physical Review D, vol. 102, no. 8, 083018, pp. 1-11. https://doi.org/10.1103/PhysRevD.102.083018

APA

March-Russell, J., Tillim, H., & West, S. (2020). Reproductive freeze-in of self-interacting dark matter. Physical Review D, 102(8), 1-11. [083018]. https://doi.org/10.1103/PhysRevD.102.083018

Vancouver

March-Russell J, Tillim H, West S. Reproductive freeze-in of self-interacting dark matter. Physical Review D. 2020 Oct 19;102(8):1-11. 083018. https://doi.org/10.1103/PhysRevD.102.083018

Author

March-Russell, John ; Tillim, Hannah ; West, Stephen. / Reproductive freeze-in of self-interacting dark matter. In: Physical Review D. 2020 ; Vol. 102, No. 8. pp. 1-11.

BibTeX

@article{71a65578f5594a1bb391d410d982239d,
title = "Reproductive freeze-in of self-interacting dark matter",
abstract = "We present a mechanism for dark matter (DM) production involving a self-interacting sector that at early times is ultra-relativistic but far-underpopulated relative to thermal equilibrium (such initial conditions often arise, e.g., from inflaton decay). Although elastic scatterings can establish kinetic equilibrium we show that for a broad variety of self-interactions full equilibrium is never established despite the DM yield significantly evolving due to 2→k (k>2) processes (the DM carries no conserved quantum number nor asymmetry). During the active phase of the process, the DM to Standard Model temperature ratio falls rapidly, with DM kinetic energy being converted to DM mass, the inverse of the recently-discussed `cannibal DM mechanism'. Potential observables and applications include self-interacting DM signatures in galaxies and clusters, dark acoustic oscillations, the alteration of free-streaming constraints, and possible easing of σ8 and Hubble tensions.",
author = "John March-Russell and Hannah Tillim and Stephen West",
year = "2020",
month = oct,
day = "19",
doi = "10.1103/PhysRevD.102.083018",
language = "English",
volume = "102",
pages = "1--11",
journal = "Physical Review D",
issn = "1550-7998",
publisher = "AMER PHYSICAL SOC",
number = "8",

}

RIS

TY - JOUR

T1 - Reproductive freeze-in of self-interacting dark matter

AU - March-Russell, John

AU - Tillim, Hannah

AU - West, Stephen

PY - 2020/10/19

Y1 - 2020/10/19

N2 - We present a mechanism for dark matter (DM) production involving a self-interacting sector that at early times is ultra-relativistic but far-underpopulated relative to thermal equilibrium (such initial conditions often arise, e.g., from inflaton decay). Although elastic scatterings can establish kinetic equilibrium we show that for a broad variety of self-interactions full equilibrium is never established despite the DM yield significantly evolving due to 2→k (k>2) processes (the DM carries no conserved quantum number nor asymmetry). During the active phase of the process, the DM to Standard Model temperature ratio falls rapidly, with DM kinetic energy being converted to DM mass, the inverse of the recently-discussed `cannibal DM mechanism'. Potential observables and applications include self-interacting DM signatures in galaxies and clusters, dark acoustic oscillations, the alteration of free-streaming constraints, and possible easing of σ8 and Hubble tensions.

AB - We present a mechanism for dark matter (DM) production involving a self-interacting sector that at early times is ultra-relativistic but far-underpopulated relative to thermal equilibrium (such initial conditions often arise, e.g., from inflaton decay). Although elastic scatterings can establish kinetic equilibrium we show that for a broad variety of self-interactions full equilibrium is never established despite the DM yield significantly evolving due to 2→k (k>2) processes (the DM carries no conserved quantum number nor asymmetry). During the active phase of the process, the DM to Standard Model temperature ratio falls rapidly, with DM kinetic energy being converted to DM mass, the inverse of the recently-discussed `cannibal DM mechanism'. Potential observables and applications include self-interacting DM signatures in galaxies and clusters, dark acoustic oscillations, the alteration of free-streaming constraints, and possible easing of σ8 and Hubble tensions.

U2 - 10.1103/PhysRevD.102.083018

DO - 10.1103/PhysRevD.102.083018

M3 - Article

VL - 102

SP - 1

EP - 11

JO - Physical Review D

JF - Physical Review D

SN - 1550-7998

IS - 8

M1 - 083018

ER -