Neutrino astrophysics : recent advances and open issues

Volpe, Cristina

doi:10.1088/1742-6596/631/1/012048

Cited by 4 publications

(4 citation statements)

References 140 publications

(184 reference statements)

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“…From Eq. (27) we see that |0 e,µ cannot be reduced as a tensor product of vectors built on |0 1,2 : this indeed confirms that the phenomenon of flavor mixing is related to the entanglement of mass eigenstates (see [30] for the discussion of entanglement in the context of particle mixing and oscillations). Another interesting feature of this phenomenon appears as one analyses more closely the parameter a, which in order to exist needs at least two fermion families to be present.…”

Section: Vacuum Structure and Non-commutativitysupporting

confidence: 71%

“…(38) is satisfied in this approximation -cf Eq. (27). This is indeed sufficient for the following considerations.…”

Section: Thermodynamical Propertiesmentioning

confidence: 81%

“…in renormalization theory or in the dynamical generation of mass [25,26]. Bogoliubov transformations are also used in recent studies of neutrino mixing in astrophysics [27]. The key point in our analysis is the non commutativity between rotation and Bogoliubov transformations, a feature which turns out to be at the origin of the inequivalence among mass and flavor vacua.…”

Section: Introductionmentioning

confidence: 99%

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On the rôle of rotations and Bogoliubov transformations in neutrino mixing

2016

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We show that mixing transformations for Dirac fields arise as a consequence of the non-trivial interplay between rotations and Bogoliubov transformations at level of ladder operators. Indeed the non-commutativity between the algebraic generators of such transformations turns out to be responsible of the unitary inequivalence of the flavor and mass representations and of the associated vacuum structure. A possible thermodynamic interpretation is also investigated

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Section: Vacuum Structure and Non-commutativitysupporting

confidence: 71%

“…(38) is satisfied in this approximation -cf Eq. (27). This is indeed sufficient for the following considerations.…”

Section: Thermodynamical Propertiesmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

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On the rôle of rotations and Bogoliubov transformations in neutrino mixing

2016

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“…As a consequence, the oscillation probabilities are modified in a non trivial manner via the Mikheyev-Smirnov-Wolfenstein (MSW) mechanism [7]. Matter effects are specially significant in the Sun and other astrophysical objects and events, in particular, in core-collapse supernovae [8].…”

Section: Introductionmentioning

confidence: 99%

Efficient numerical integration of neutrino oscillations in matter

2016

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A special purpose solver, based on the Magnus expansion, well suited for the integration of the linear three neutrino oscillations equations in matter is proposed. The computations are speeded up to two orders of magnitude with respect to a general numerical integrator, a fact that could smooth the way for massive numerical integration concomitant with experimental data analyses. Detailed illustrations about numerical procedure and computer time costs are provided.Comment: 10 pages, 3 figure

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The surprising influence of late charged current weak interactions on Big Bang Nucleosynthesis

Grohs

Fuller

2016

Nuclear Physics B

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The weak interaction charged current processes (ν e + n ↔ p + e − ;ν e + p ↔ n + e + ; n ↔ p + e − +ν e ) interconvert neutrons and protons in the early universe and have significant influence on Big Bang Nucleosynthesis (BBN) light-element abundance yields, particularly that for 4 He. We demonstrate that the influence of these processes is still significant even when they operate well below temperatures T ∼ 0.7 MeV usually invoked for "weak freeze-out," and in fact down nearly into the alpha-particle formation epoch (T ≈ 0.1 MeV). This physics is correctly captured in commonly used BBN codes, though this late-time, lowtemperature persistent effect of the isospin-changing weak processes, and the sensitivity of the associated rates to lepton energy distribution functions and blocking factors are not widely appreciated. We quantify this late-time influence by analyzing weak interaction rate dependence on the neutron lifetime, lepton energy distribution functions, entropy, the proton-neutron mass difference, and Hubble expansion rate. The effects we point out here render BBN a keen probe of any beyond-standard-model physics that alters lepton number/energy distributions, even subtly, in epochs of the early universe all the way down to near T = 100 keV.

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Neutrino astrophysics : recent advances and open issues

Cited by 4 publications

References 140 publications

On the rôle of rotations and Bogoliubov transformations in neutrino mixing

On the rôle of rotations and Bogoliubov transformations in neutrino mixing

Efficient numerical integration of neutrino oscillations in matter

The surprising influence of late charged current weak interactions on Big Bang Nucleosynthesis

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