Libei ricevuti e recensioni

We calculate the Cherenkov process ν → νγ in the presence of a homogeneous magnetic field. The neutrinos are taken to be massless with only standard-model couplings. The magnetic field fulfills the dual purpose of inducing an effective neutrino-photon vertex and of modifying the photon dispersion relation such that the Cherenkov condition ω < |k| is fulfilled. Our effect is closely related to photon splitting that occurs in magnetic fields and that may be astrophysically important in the strong magnetic fields of pulsars. It is also closely related to magnetic-field enhanced radiative decays ν → ν ′ γ that have been extensively discussed in the recent literature. In the appropriate limits we agree with these results, but we disagree with earlier explicit calculations of the Cherenkov process. For a field strength Bcrit = m 2 e /e = 4.41 × 10 13 Gauss and for E = 2me the Cherenkov rate is about 6 × 10 −11 s −1 and thus too small to be of practical importance for pulsar physics.

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“…The photon polarization tensor implied by this result has been calculated in Refs. [24,27,28]. Following Ref.…”

Section: The Neutrino-photon-vertexmentioning

confidence: 99%

Cherenkov radiation by massless neutrinos in a magnetic field

1997

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“…We note that any shared time one introduces to synchronize events are not coincident as neighbouring events can only make sense in limited regions. It is however possible to define an extended reference frame in the presence of gravity that extends over a congruence of time like curves [22][23][24][25] and it is in this frame we will make our approximation a subject that will be addressed in [26]. It suffices to say that it is the interim period, leading up to equilibrium designating the extended reference frame, that we investigate using a relativistic multifluid approximation.…”

Section: Dark Energy (De) Interacting With Matter (Dm ) In Presenmentioning

confidence: 99%

A transient phase in cosmological evolution : A multi-fluid approximation for a quasi-thermodynamical equilibrium

Osano

Oreta

2020

Gen Relativ Gravit

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In this article, we examine the dynamics of a multi-fluid system in which (i) different fluids interact, and (ii) there exists a limit in which the multiple fluids evolve into a mixture that satisfies single-fluid approximation. We consider the potential application of this modelling to studies of a cosmological transition which is marked by one material domination replaced by another. The thermodynamical implications of such fluid dynamics are explored where we find that the second law of thermodynamics holds given an emergent Rindler horizon. We argue that such transient periods exist in cosmological evolutions and are best modelled using multi-fluid approximation. Our application of the modelling to an interacting dark-sector leads to the modification of the equation of state of a third non-interacting constituent in a 3-species multi-fluid system.

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Libei ricevuti e recensioni

Cited by 2 publications

References 1 publication

Cherenkov radiation by massless neutrinos in a magnetic field

Cherenkov radiation by massless neutrinos in a magnetic field

A transient phase in cosmological evolution : A multi-fluid approximation for a quasi-thermodynamical equilibrium

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