A hadronic explanation of the lepton anomaly

Journal of Physics: Conference Series IOP Publishing 531:1 (2014) 012008-012008

Authors:

Philipp Mertsch, Subir Sarkar

Abstract:

The rise in the positron fraction, observed by PAMELA, Fermi-LAT and most recently by AMS-02, has created a lot of interest, fuelled by speculations about an origin in dark matter annihilation in the Galactic halo. However, other channels, e.g. antiprotons or gamma-rays, now severely constrain dark matter interpretations, thus requiring astrophysical sources of positrons. We have investigated the possibility that supernova remnants, the most likely sources of Galactic cosmic rays, can in fact also produce a hard spectrum of secondary positrons, by spallation and acceleration at the shock. This mechanism is guaranteed if hadronic CRs are present and would also lead to observable signatures in other secondary channels like the boron-to-carbon or antiproton-to-proton ratios. If such features were borne out by upcoming AMS-02 data, this would rule out other explanations.

Two-loop helicity amplitudes for the production of two off-shell electroweak bosons in quark-antiquark collisions

(2014)

Authors:

Fabrizio Caola, Johannes M Henn, Kirill Melnikov, Alexander V Smirnov, Vladimir A Smirnov

A restricted dimer model on a two-dimensional random causal triangulation

Journal of Physics A: Mathematical and Theoretical IOP Publishing 47:36 (2014) 365001-365001

Authors:

J Ambjørn, B Durhuus, John Wheater

Abstract:

We introduce a restricted hard dimer model on a random causal triangulation that is exactly solvable and generalizes a model recently proposed by Atkin and Zohren (2012 Phys. Lett. B 712 445–50). We show that the latter model exhibits unusual behaviour at its multicritical point; in particular, its Hausdorff dimension equals 3 and not $3/2$ as would be expected from general scaling arguments. When viewed as a special case of the generalized model introduced here we show that this behaviour is not generic and therefore is not likely to represent the true behaviour of the full dimer model on a random causal triangulation.

3.55 keV photon line and its morphology from a 3.55 keV axionlike particle line

Physical Review D American Physical Society (APS) 90:2 (2014) 023540

Authors:

Michele Cicoli, Joseph P Conlon, MC David Marsh, Markus Rummel

A SEARCH FOR POINT SOURCES OF EeV PHOTONS

The Astrophysical Journal American Astronomical Society 789:2 (2014) 160

Authors:

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