Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rotationally-induced asymmetry in the double-peak lightcurves of the
  bright EGRET pulsars?   Pulsed emission from the bright EGRET pulsars - Vela, Crab, and Geminga -
extends up to 10 GeV. The generic gamma lightcurve features two peaks separated
by 0.4 to 0.5 in phase. According to Thompson (2001) the lightcurve becomes
asymmetrical above 5 GeV in such a way that the trailing peak dominates over
the leading peak. We attempt to interpret this asymmetry within a
single-polar-cap scenario. We investigate the role of rotational effects on the
magnetic one-photon absorption rate in inducing such asymmetry. Our Monte Carlo
simulations of pulsar gamma-ray beams reveal that in the case of oblique
rotators with rotation periods of a few millisecond the rotational effects lead
to the asymmetry of the requested magnitude. However, the rotators relevant for
the bright EGRET pulsars must not have their inclination angles too large in
order to keep the two peaks at a separation of 0.4 in phase. With such a
condition imposed on the model rotators the resulting effects are rather minute
and can hardly be reconciled with the magnitude of the observed asymmetry.

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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: ao-sci
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The categories of this paper are: cond-mat
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The categories of this paper are: math
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The categories of this paper are: hep-th
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The categories of this paper are: eess
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: plasm-ph