Secondary Production as the Origin of the Cosmic-Ray Positron Excess

Kruskal, M.; Ahlen, S. P.; Tarlè, G.

doi:10.3847/0004-637x/818/1/70

Cited by 9 publications

(10 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Osinovsky for his advice on subtle issues of differential geometry and for critically reading the manuscript. This work is supported by the Rapid Research, Inc. 15 As J. Schwinger pointed out in Section 4.2 of his book [14], the anomalous magnetic moment is a dynamic quantity, which is suppressed over very short time intervals. It is not unreasonable to ask if the same can be true for the normal magnetic moment.…”

Section: Acknowledgementsmentioning

confidence: 99%

“…In other words, is solitary proton similar to a magnetized needle? 15 The reader can view the last question as a version of the Mach paradox. 4) Finally, the biggest challenge is to find a regular method to treat the transient processes with the Dirac waveforms in order to study how autolocalization may develop in time.…”

mentioning

confidence: 99%

“…If so, it is reasonable to look, for example, for a correlation between the observed excess of positrons in cosmic rays and strength of magnetic fields in their potential sources (for a recent review see Ref. [15]). …”

mentioning

confidence: 99%

See 2 more Smart Citations

On the Origin of Charge-Asymmetric Matter. III. Properties of Autolocalized Dirac Waveforms

Makhlin¹

2017

JMP

View full text Add to dashboard Cite

This paper continues the author's work [1] [2], where a novel framework of the matter-induced physical geometry was built and an intrinsic nonlinearity of the Dirac equation was discovered. The previous analysis of solitary waveforms' properties [2] is extended to the four-component Dirac field. It is found that the internal spherical symmetry of the Dirac waveforms is broken to the axial one. The nonlinear Dirac equation is solved and the localized configurations are found analytically. A strict proof that the proper time slowdown is the major mechanism of autolocalization is presented. The previous qualitative conjecture regarding stability or instability of the two types of the waveforms and the origin of cosmological charge asymmetry is supported by detailed analysis. A solution of the problem of mapping between the matter-induced geometry of autolocalized waveforms and the geometry of an ambient Minkowski space is proposed. These results resolve the longstanding puzzle of how the physical Dirac field of real matter becomes a finite-sized particle.

show abstract

Section: Acknowledgementsmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

On the Origin of Charge-Asymmetric Matter. III. Properties of Autolocalized Dirac Waveforms

Makhlin¹

2017

JMP

View full text Add to dashboard Cite

show abstract

“…At higher energy the dependence on the Galactic propagation model becomes less important [12]. A recent work of of Kruskal, Ahlen and Tarlé [10] discusses observations of the beryllium isotopic composition at a E kin 2 GeV/nucleon (a rigidity of order 7.0 GV), setting an upper limit T age 2 Myr. This result is in conflict [see Eq.…”

Section: Secondary Nucleimentioning

confidence: 99%

“…The idea is to measure the suppression of the flux of an unstable nuclear isotope such as beryllium-10 (T 1/2 1.51 ± 0.04 Myr) relative to the flux of a stable isotope such as beryllium-9. For example, the CRIS collaboration aboard the ACE spacecraft [9] has measured a isotopic ratio 10 Be/ 9 Be of order 0.11-0.12 for nuclei with E kin 70-150 MeV per nucleon, and interpreted the measurement, on the basis of a steady state leaky-box model, to obtain a residence time T age = 15.0 ± 1.6 Myr. At higher energy the dependence on the Galactic propagation model becomes less important [12].…”

Section: Secondary Nucleimentioning

confidence: 99%

Gamma ray and antiparticles ($e^+$ and $\overline{p}$) as tools to study the propagation of cosmic rays in the Galaxy

Lipari¹

2017

Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017)

View full text Add to dashboard Cite

The spectra of cosmic rays observed at the Earth are determined by the properties of their sources and by the properties of their propagation in the Galaxy. Disentangling the source and propagation effects is a problem of central importance for cosmic ray astrophysics. To address this problem, the study of the fluxes of antiparticles (e + and p) and of the diffuse Galactic flux of γ can be a very powerful tool, because it is expected that the dominant mechanism of production is identical for all three components, namely the creation of the particles as secondary products in the interactions of primary cosmic rays. In this case, the shape and relative size of the source spectra for the three particles is reasonably well known. Folding the inclusive hadronic cross section with the (power law) energy distribution of the primary particles one obtains secondary source spectra that for E 20 GeV, in good approximation, are also of power law form, with the same spectral index of the primary particles. The predicted ratios at production are e + /p 2 and γ/e + 5. The observed spectra of e + , p and γ are power laws with spectral indices α e + α p α γ 2.7-2.8, with an observed ratio e + /p 2, equal to the ratio at production. These results suggests that the propagation effects for charged particles have only a weak energy dependence, and are approximately equal for e + and p. This implies that the total energy losses for e ± during propagation in the Galaxy is negligible, and therefore that the cosmic ray Galactic residence time is sufficiently short. An intriguing possibility is that a marked softening of the energy spectrum of the flux of (e + + e − ) observed by the Cherenkov telescopes at E ≈ 0.9 TeV is the manifestation of the critical energy where the energy losses of e ∓ becomes important. This assumption determines the Galactic residence time as of order T age (1 TeV) ≈ 1 Myr. A comparison of the fluxes of antiparticles and the diffuse Galactic γ flux allows then to estimate the effective cosmic ray confinement volume as V CR 300 kpc 3 . These tentative conclusions are in potential conflict with common interpretations of the fluxes of secondary nuclei (such as lithium, beryllium and boron) and require significant production of secondary nuclei inside or near the accelerators. Models where the cosmic ray confinement time is significantly longer than 1 Myr require a new hard source of positrons in the Galaxy, that must be fine tuned in spectral shape and absolute normalization. The implications of this puzzle are of profound importance for high energy astrophysics and the modeling of the cosmic ray accelerators.

show abstract

High precision particle astrophysics as a new window on the universe with an Antimatter Large Acceptance Detector In Orbit (ALADInO)

et al. 2021

View full text Add to dashboard Cite

Multimessenger astrophysics is based on the detection, with the highest possible accuracy, of the cosmic radiation. During the last 20 years, the advent space-borne magnetic spectrometers in space (AMS-01, Pamela, AMS-02), able to measure the charged cosmic radiation separating matter from antimatter, and to provide accurate measurement of the rarest components of Cosmic Rays (CRs) to the highest possible energies, have become possible, together with the ultra-precise measurement of ordinary CRs. These developments started the era of precision Cosmic Ray physics providing access to a rich program of high-energy astrophysics addressing fundamental questions like matter-antimatter asymmetry, indirect detection for Dark Matter and the detailed study of origin, acceleration and propagation of CRs and their interactions with the interstellar medium.In this paper we address the above-mentioned scientific questions, in the context of a second generation, large acceptance, superconducting magnetic spectrometer proposed as mission in the context of the European Space Agency’s Voyage2050 long-term plan: the Antimatter Large Acceptance Detector In Orbit (ALADInO) would extend by about two orders of magnitude in energy and flux sensitivity the separation between charged particles/anti-particles, making it uniquely suited for addressing and potentially solving some of the most puzzling issues of modern cosmology.

show abstract

Secondary Production as the Origin of the Cosmic-Ray Positron Excess

Cited by 9 publications

References 35 publications

On the Origin of Charge-Asymmetric Matter. III. Properties of Autolocalized Dirac Waveforms

On the Origin of Charge-Asymmetric Matter. III. Properties of Autolocalized Dirac Waveforms

Gamma ray and antiparticles ($e^+$ and $\overline{p}$) as tools to study the propagation of cosmic rays in the Galaxy

High precision particle astrophysics as a new window on the universe with an Antimatter Large Acceptance Detector In Orbit (ALADInO)

Contact Info

Product

Resources

About