Zobrazeno 1 - 10
of 35
pro vyhledávání: '"N Caderni"'
Autor:
R. Fabbri, N. Caderni
Publikováno v:
Physics Letters A. 72:71-74
We analyse the evolution of Bianchi type-VIIh cosmological models during the lepton era and the subsequent adiabatic epochs. We find that these model cannot generally attain to the low-density regime with a reasonable anisotropy level because of a cu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ccbacf4743a7446e05b7b49bd2b4bca6
https://doi.org/10.1016/0375-9601(79)90650-9
https://doi.org/10.1016/0375-9601(79)90650-9
Autor:
N. Caderni, R. Fabbri
Publikováno v:
Physics Letters B. 69:508-511
We calculate shear and bulk viscosity of the cosmological fluid for the early universe. Integrating the gravitational equations for isotropic models, we find that photon entropy increases by 0.11% due to the bulk viscosity in the lepton and plasma er
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7b64b419f33ac6b508ad161e7575b5f2
https://doi.org/10.1016/0370-2693(77)90856-5
https://doi.org/10.1016/0370-2693(77)90856-5
Publikováno v:
Physical Review D. 17:1901-1907
We investigate the rotation of the polarization planes for radiation freely traveling in homogeneous anisotropic spaces (Brans effect). Solving the parallel-transport equations in Bianchi type-I and type-V spaces, we find that the rotation angle is a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::943cf07240f5293de96a5c84c3325bde
https://doi.org/10.1103/physrevd.17.1901
https://doi.org/10.1103/physrevd.17.1901
Autor:
M. D. Pollock, N. Caderni
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 190:509-525
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0fe511edd214c09ff633f6f5aa91c37d
https://doi.org/10.1093/mnras/190.3.509
https://doi.org/10.1093/mnras/190.3.509
Autor:
N. Caderni, M. Martellini
Publikováno v:
International Journal of Theoretical Physics. 23:233-249
Within the ADM technique of Hamiltonian cosmology, in the case of Bianchi class A models, we introduce a Fock-like, field theoretical approach to the description of quantum cosmology. We then calculate the total transition amplitude between two quant
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2da5fe45f6aaf95ac976cd8aade19a91
https://doi.org/10.1007/bf02080689
https://doi.org/10.1007/bf02080689
Autor:
R. Fabbri, N. Caderni
Publikováno v:
Lettere al Nuovo Cimento. 20:185-189
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d3aa81166d5566fdf81cc0f1bfb771a4
https://doi.org/10.1007/bf02785123
https://doi.org/10.1007/bf02785123
Publikováno v:
Physical Review D. 17:1908-1918
The linear polarization degree of the cosmological background has been investigated at angular scales ranging between 0.5/sup 0/ and 40/sup 0/ by means of a balloon-borne far-infrared polarimeter. An upper limit has been found of 8 x 10/sup -/4 at 40
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::efcf02959760f47554bf7ff82332a05d
https://doi.org/10.1103/physrevd.17.1908
https://doi.org/10.1103/physrevd.17.1908
Autor:
N. Caderni, S. Bonometto
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 191:411-415
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dd9871064f9e5a8427f06d8ced0b9d24
https://doi.org/10.1093/mnras/191.2.411
https://doi.org/10.1093/mnras/191.2.411