Dark matter annihilation into leptons through gravity portals

Xudong, Sun; Dai, B. Z.

doi:10.1007/jhep04(2021)108

Cited by 8 publications

(4 citation statements)

References 68 publications

(94 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Considering the vector DM to be a standard WIMP, for the freeze-out scenario, one can have a viable parameter space safe from the stringent (spin-independent) direct search bounds for ξ ∼ O(10 30 ). We emphasise that in previous works on non-minimally coupled scalar DM, the DM communicates with the SM via a (non-)standard Higgs mediator (which is also non-minimally coupled), that suppresses its direct search cross-section due to heavy mediator mass or small momentum exchange [37,58]. This is in sharp contrast to the present scenario where the absence of mediator opens up direct search possibilities via contact interactions.…”

Section: Introductionmentioning

confidence: 57%

“…In case where the conformal symmetry is broken, ξ can well be considered to be a free parameter 2 that determines the DM-SM interaction strength, albeit suppressed by the Planck mass. While the phenomenology of non-minimally coupled DM has been studied both in the context of WIMP [37,58] and FIMP [59], considering DM with or without any intrinsic spin, the study of non-minimally coupled vector DM is rather hard to find.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Non-minimally coupled vector boson dark matter

Barman

Bernal

Das

et al. 2022

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

We consider a simple abelian vector dark matter (DM) model, where only the DM (X̃μ) couples non-minimally to the scalar curvature (R̃) of the background spacetime via an operator of the form ∼X̃μ X̃μ R̃. By considering the standard freeze-out scenario, we show, it is possible to probe such a non-minimally coupled DM in direct detection experiments for a coupling strength ξ∼𝒪(1030) and DM mass m X ≲ 55 TeV, satisfying Planck observed relic abundance and perturbative unitarity. We also discuss DM production via freeze-in, governed by the non-minimal coupling, that requires ξ ≲10-5 to produce the observed DM abundance over a large range of DM mass depending on the choice of the reheating temperature. We further show, even in the absence of the non-minimal coupling, it is possible to produce the whole observed DM abundance via 2-to-2 scattering of the bath particles mediated by massless gravitons.

show abstract

Section: Introductionmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Non-minimally coupled vector boson dark matter

Barman

Bernal

Das

et al. 2022

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

“…However, given that SNRs are the major source of all cosmic rays, in order to explain the rising positron fraction, the metallicities of environments of recent and close-by SNRs have to be different from those of the Milky Way on average [80,81,85,86]. Another possibility is that of particle dark matter [67,[87][88][89][90][91][92][93][94][95][96][97][98][99][100][101][102][103][104][105][106]. While such particle dark matter models have been constrained by cosmic microwave background (CMB) data [107][108][109][110][111][112] and γ-rays [113][114][115], the full parameter space has not been entirely excluded.…”

Section: Introductionmentioning

confidence: 99%

Utilizing cosmic-ray positron and electron observations to probe the averaged properties of Milky Way pulsars

Cholis

Krommydas

2022

Phys. Rev. D

View full text Add to dashboard Cite

Pulsars have long been studied in the electromagnetic spectrum. Their environments are rich in high-energy cosmic-ray electrons and positrons likely enriching the interstellar medium with such particles. In this work we use recent cosmic-ray observations from the AMS-02, CALET and DAMPE collaborations to study the averaged properties of the local Milky Way pulsar population.We perform simulations of the local Milky Way pulsar population, for interstellar medium assumptions in agreement with a range of cosmic-ray nuclei measurements. Each such simulation contains ∼ 10 4 pulsars of unique age, location, initial spin-down power and cosmic-ray electron/positron spectra. We produce more than 7 × 10 3 such Milky Way pulsar simulations. We account for and study i) the pulsars' birth rates and the stochastic nature of their birth, ii) their initial spin-down power distribution, iii) their time evolution in terms of their braking index and characteristic spindown timescale, iv) the fraction of spin-down power going to cosmic-ray electrons and positrons and v) their propagation through the interstellar medium and the Heliosphere. We find that pulsars of ages ∼ 10 5 − 10 7 yr, have a braking index that on average has to be 3 or larger. Given that electromagnetic spectrum observations of young pulsars find braking indices lower than 3, our work provides strong hints that pulsars' braking index increases on average as they age, allowing them to retain some of their rotational energy. Moreover, we find that pulsars have relatively uniform properties as sources of cosmic-ray electrons and positrons in terms of the spectra they produce and likely release O(10%) of their rotational energy to cosmic rays in the ISM. Finally, we find at 12 GeV positrons a spectral feature that suggests a new subpopulation of positron sources contributing at these energies.

show abstract

“…However, given that SNRs are the major source of all cosmic rays, in order to explain the rising positron fraction, the metallicities of environments of recent and close-by SNRs have to be different from those of the Milky Way on average [79,80,84,85]. Another possibility is that of particle dark matter [66,[86][87][88][89][90][91][92][93][94][95][96][97][98][99][100][101][102][103][104][105]. While such particle dark matter models have been constrained by cosmic-microwave background (CMB) data [106][107][108][109][110][111] and γ-rays [112][113][114], the full parameter space has not been entirely excluded.…”

Section: Introductionmentioning

confidence: 99%

Utilizing cosmic-ray positron and electron observations to probe the averaged properties of Milky Way pulsars

Cholis,

Krommydas

2021

Preprint

View full text Add to dashboard Cite

Pulsars have long been studied in the electromagnetic spectrum. Their environments are rich in high-energy cosmic-ray electrons and positrons likely enriching the interstellar medium with such particles. In this work we use recent cosmic-ray observations from the AMS-02, CALET and DAMPE collaborations to study the averaged properties of the local Milky Way pulsar population.We perform simulations of the local Milky Way pulsar population, for interstellar medium assumptions in agreement with a range of cosmic-ray nuclei measurements. Each such simulation contains ∼ 10 4 pulsars of unique age, location, initial spin-down power and cosmic-ray electron/positron spectra. We produce more than 7 × 10 3 such Milky Way pulsar simulations. We account for and study i) the pulsars' birth rates and the stochastic nature of their birth, ii) their initial spin-down power distribution, iii) their time evolution in terms of their braking index and characteristic spindown timescale, iv) the fraction of spin-down power going to cosmic-ray electrons and positrons and v) their propagation through the interstellar medium and the Heliosphere. We find that pulsars of ages ∼ 10 5 − 10 7 yr, have a braking index that on average has to be 3 or larger. Given that electromagnetic spectrum observations of young pulsars find braking indices lower than 3, our work provides strong hints that pulsars' braking index increases on average as they age, allowing them to retain some of their rotational energy. Moreover, we find that pulsars have relatively uniform properties as sources of cosmic-ray electrons and positrons in terms of the spectra they produce and likely release O(10%) of their rotational energy to cosmic-rays in the ISM. Finally, we find at 12 GeV positrons a spectral feature that suggests a new subpopulation of positron sources contributing at these energies.

show abstract

Dark matter annihilation into leptons through gravity portals

Cited by 8 publications

References 68 publications

Non-minimally coupled vector boson dark matter

Non-minimally coupled vector boson dark matter

Utilizing cosmic-ray positron and electron observations to probe the averaged properties of Milky Way pulsars

Utilizing cosmic-ray positron and electron observations to probe the averaged properties of Milky Way pulsars

Contact Info

Product

Resources

About