Pulsar interpretation for the AMS-02 result

Abstract

The AMS-02 collaboration has just published a high precision measurement of the cosmic positron fraction e + /(e − + e + ), which rises with energy from ∼ 5 GeV to ∼ 350 GeV. The result indicates the existence of primary electron/positron sources to account for the positron excess. In this work, we investigate the possibility that the nearby mature pulsars are the primary positron sources. By fitting the data we find that the positrons from a single nearby pulsar, such as Geminga or Monogem, with the spectral index α ∼ 2 can interpret the AMS-02 result. We also investigate the possibility that high energy positrons are generated by multiple known pulsars in the ATNF catalogue. Such a scenario can also fit the AMS-02 data well. Future precise measurements of fine structures in the positron spectrum would be a support to the pulsar scenario.

Probing the astrophysical origin of high-energy cosmic-ray electrons with Monte Carlo simulation

“…Geminga (PSR J0633+1746) and PSR B1822-09 are the "next-in-line" candidates and might also contribute below 100 GeV. These results corroborate the thesis of mature SNRs/pulsars already pointed to by many earlier studies [38,[97][98][99][100][101]. Other interesting objects include PSR B1742-30 and PSR J1741-2054.…”

Three-Dimensional Model of Cosmic-Ray Lepton Propagation Reproduces Data from the Alpha Magnetic Spectrometer on the International Space Station

“…We avoid then any tension with two relevant features of the CRE data: (a) the smoothness of the observed CRE spectra, confirmed also with high accuracy by AMS-02, in contrast to the bumpiness expected if several local sources contribute to the high-energy fluxes; (b) the stringent upper limits placed by Fermi LAT and AMS-02 (in this case for the PF only) on the CRE dipole anisotropy, which are already challenging, albeit not excluding yet, the local source scenario [15,16]. Remarkably, AMS-02 results suggest the extra component to be softer than inferred from PAMELA observations [17][18][19]. This makes the relative contribution of local sources, if any, less relevant than previous analyses suggested.…”

The leptophilic dark matter with $Z'$ interaction: from indirect searches to future $e^+ e^-$ collider searches

“…There have been a lot of efforts to address the anomalous positron fluxes observed by the PAMELA and AMS-02 results, including the Sommerfeld enhancement effects [8][9][10][11][12][13][14][15][16], the lightest neutralino as DM candidate in the supersymmetric models [17][18][19][20], and other possibilities [21][22][23][24][25][26][27][28][29][30][31][32][33]. Here we consider a leptophilic DM setup with a Z vector boson being the mediator between the visible sector and the dark sector.…”