| 1. |
- DANIELSSON, UH, et al.
(författare)
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POLARIZATION OF A QED PLASMA IN A STRONG MAGNETIC-FIELD
- 1995
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Ingår i: PHYSICAL REVIEW D. - : AMER INST PHYSICS. - 0556-2821. ; 52:4, s. 2533-2542
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- In this paper we study the polarization tenser of photons in a QED plasma in the presence of a magnetic field. We do it both at vanishing and at finite temperature. We use two different methods to compute the polarization tenser components IImu nu within
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| 2. |
- Elmfors, P, et al.
(författare)
-
Neutrino dispersion in magnetized media and spin oscillations in the early Universe
- 1996
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Ingår i: NUCLEAR PHYSICS B. - : ELSEVIER SCIENCE BV. - 0550-3213. ; 479:1-2, s. 3-24
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- We derive general expressions for the neutrino dispersion relation in a magnetized plasma with a wide range of temperatures, chemical potentials, and magnetic field strengths, If the electron and proton chemical potentials vanish, as in the early Universe
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| 3. |
- Grasso, D, et al.
(författare)
-
Cosmological bounds to the magnetic moment of heavy tau neutrinos
- 1996
-
Ingår i: PHYSICAL REVIEW D. - : AMER INST PHYSICS. - 0556-2821. ; 54:2, s. 1374-1378
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The magnetic moment of tau neutrinos in the MeV mass range may he large enough to modify the cosmological freeze-out calculation and determine the tau-neutrino relic density. In this paper we reexamine such a possibility, We calculate the evolution and fr
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| 4. |
- Grasso, D, et al.
(författare)
-
Cosmology and tau neutrino magnetic moment
- 1996
-
Ingår i: NUCLEAR PHYSICS B. - : ELSEVIER SCIENCE BV. ; , s. 275-278
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- We investigate the possibility that stable tau neutrinos with a large diagonal magnetic moment and mass in the range 0.5 < m(nu tau) < 24 MeV could form cold dark matter. We show that Universe age limit are incompatible with this hypothesis and, more in g
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| 5. |
- GRASSO, D, et al.
(författare)
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EFFECTS OF MAGNETIC-FIELDS ON PRIMORDIAL NUCLEOSYNTHESIS
- 1995
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Ingår i: NUCLEAR PHYSICS B. - : ELSEVIER SCIENCE BV. - 0550-3213. ; , s. 303-307
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- We discuss here several effects of strong magnetic fields on the synthesis of light elements during the big-bang. They include: changes in the reaction rates, variation in the expansion rate of the Universe, particle masses shift and the modification of t
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| 6. |
- GRASSO, D, et al.
(författare)
-
LIMITS ON POSSIBLE MAGNETIC-FIELDS AT NUCLEOSYNTHESIS TIME
- 1995
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Ingår i: ASTROPARTICLE PHYSICS. - : ELSEVIER SCIENCE BV. - 0927-6505. ; 3:1, s. 95-102
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- In this paper we discuss limits on magnetic fields that could have been present at nucleosynthesis time. We considered several effects that could be relevant modifing light elements relic abundances. They include: changes in reaction rates, mass shifts du
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| 7. |
- Grasso, D, et al.
(författare)
-
On the nature of the magnetic fields generated during the electroweak phase transition
- 1998
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 418:3-4, s. 258-265
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- In this letter we reanalyse the question of the origin of magnetic fields during the electroweak phase transition. We show that their formation is intimately connected to some semiclassical configurations of the gauge fields, such as electroweak Z-strings
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| 8. |
- Grasso, D, et al.
(författare)
-
Revisiting nucleosynthesis constraints on primordial magnetic fields
- 1996
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Ingår i: PHYSICS LETTERS B. - : ELSEVIER SCIENCE BV. - 0370-2693. ; 379:1-4, s. 73-79
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- In view of several conflicting results, we reanalyze the effects of magnetic fields on the primordial nucleosynthesis. In the case the magnetic field is homogeneous over a horizon volume, we show that the main effects of the magnetic field are given by th
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