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ASTROPHYSICS; NEW ASTROPHYSICS DATA HAVE BEEN REPORTED BY A.A. SAHARIAN AND CO-AUTHORS
News of Science
December 19, 2010
According to recent research from Yerevan, Armenia, "We examine
the spectrum of perturbations for a scalar field with an arbitrary
curvature coupling parameter in the de Sitter stage of cosmological
expansion when a cosmic string is present."
"These perturbations are caused by vacuum fluctuations in the field
and serve as seed perturbations for the formation of galaxies in the
postinflationary stage. A cosmic string disrupts the homogeneity of
a de Sitter space, so that the spectrum of the perturbations depends
on the distance from the string," wrote A.A. Saharian and colleagues.
The researchers concluded: "This dependence is oscillatory in character
with a period on the order of the perturbation wavelength."
Saharian and colleagues published their study in Astrophysics
(Perturbation Spectrum In The Inflationary Stage When A Cosmic String
Is Present. Astrophysics, 2010;53(3):434-445).
For additional information, contact A.A. Saharian, Erevan State
University, Academician G Saakyan Dept. of Theoret Physics, Yerevan,
Armenia.
Publisher contact information for the journal Astrophysics is:
Springer, Plenum Publishers, 233 Spring St., New York, NY 10013, USA.
From: A. Papazian
News of Science
December 19, 2010
According to recent research from Yerevan, Armenia, "We examine
the spectrum of perturbations for a scalar field with an arbitrary
curvature coupling parameter in the de Sitter stage of cosmological
expansion when a cosmic string is present."
"These perturbations are caused by vacuum fluctuations in the field
and serve as seed perturbations for the formation of galaxies in the
postinflationary stage. A cosmic string disrupts the homogeneity of
a de Sitter space, so that the spectrum of the perturbations depends
on the distance from the string," wrote A.A. Saharian and colleagues.
The researchers concluded: "This dependence is oscillatory in character
with a period on the order of the perturbation wavelength."
Saharian and colleagues published their study in Astrophysics
(Perturbation Spectrum In The Inflationary Stage When A Cosmic String
Is Present. Astrophysics, 2010;53(3):434-445).
For additional information, contact A.A. Saharian, Erevan State
University, Academician G Saakyan Dept. of Theoret Physics, Yerevan,
Armenia.
Publisher contact information for the journal Astrophysics is:
Springer, Plenum Publishers, 233 Spring St., New York, NY 10013, USA.
From: A. Papazian