Tweet
NEW ASTROPHYSICS DATA HAVE BEEN REPORTED BY A.A. SAHARIAN AND CO-AUTHORS
Physics Week
December 14, 2010
ASTROPHYSICS
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.
From: A. Papazian
Physics Week
December 14, 2010
ASTROPHYSICS
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.
From: A. Papazian