26 research outputs found
Bianchi Type-I Wet Dark Universe in Bimetric Relativity
In this paper , we have investigated the role of Wet Dark Fluid in Bianchi Type-I cosmological model within the framework of bimetric theory of relativity proposed by Rosen N. Here we have used a new equation of state for the matter dark energy component of the universe known as Wet Dark Fluid given by = ?( - ) which can describe a liquid for example water. It is further observed the non existence of Wet Dark Fluid in bimetric relativity. Keywords: Bianchi Type-I Universe , Wet Dark Fluid , Bimetric Relativit
Mellin-Barnes Representation for the Genus-g Finite Temperature String Theory
The Mellin-Barnes representation for the free energy of the genus- string
is constructed. It is shown that the interactions of the open bosonic string do
not modify the critical (Hagedorn) temperature. However,for the sectors having
a spinor structure, the critical temperature exists also for all and
depends on the windings. The appearance of a periodic structure is briefly
discussed.Comment: 9 pages, report UTF 294 (1993
Thermal history of the string universe
Thermal history of the string universe based on the Brandenberger and Vafa's
scenario is examined. The analysis thereby provides a theoretical foundation of
the string universe scenario. Especially the picture of the initial oscillating
phase is shown to be natural from the thermodynamical point of view. A new tool
is employed to evaluate the multi state density of the string gas. This
analysis points out that the well-known functional form of the multi state
density is not applicable for the important region , and derives a
correct form of it.Comment: 39 pages, no figures, use revtex.sty, aps.sty, aps10.sty &
preprint.st
A Novel Representation for the Free Energy in String Theory at Non-Zero Temperature
A novel representation ---in terms of a Laurent series--- for the free energy
of string theory at non-zero temperature is constructed. The examples of open
bosonic, open supersymmetric and closed bosonic strings are studied in detail.
In all these cases the Laurent series representation for the free energy is
obtained explicitly.
It is shown that the Hagedorn temperature arises in this formalism as the
convergence condition (specifically, the radius of convergence) of the
corresponding Laurent series. Some prospects for further applications are also
discussed. In particular, an attempt to describe string theory above the
Hagedorn temperature ---via Borel analytical continuation of the Laurent series
representation--- is provided.Comment: 21 pages, LaTeX file, HUPD-92-12, UB-ECM-PF 92/25, UFT 273-9
Prognostic Significance of Location of the Primary Tumor in Operable Breast Cancers
Background: The prognostic significance of the primary tumor site in
breast cancers is not established with only a few studies having
evaluated the issue. Materials and Methods: The relevance of a primary
tumor site with respect to systemic disease relapse was evaluated in
187 patients with breast cancer treated with primary surgery and
adjuvant chemotherapy, in whom the location of primary tumor was
classifiable in any one of the three sites, namely: outer, periareolar,
and inner, quadrants. Data was obtained from prospectively maintained
records of breast cancer patients treated at a single surgical unit in
a tertiary care center. Results: The three groups were comparable with
regard to demographic, pathological tumor, and treatment
characteristics. In the multivariate analysis, patients with inner and
periareolar quadrant tumors had a higher hazard for systemic disease
relapse, (2.53, 95% CI: 1.18-5.42; P = 0.02, and 2.73, 95% CI:
1.04-7.14; P = 0.04, respectively) as compared to outer quadrant
tumors. The projected five-year survival estimates in Kaplan Meier were
87%, 61%, and 69%, respectively, for outer, periareolar, and inner
quadrant. On further substratification the difference was particularly
noted in high risk inner quadrant tumors: age 64 45, premenopausal
patients, tumor size> 2 cms, positive nodes and intermediate or high
grade histology, as also in patients treated with breast conservation
and CMF, Cyclophosphamide, Methorexate, 5 Fluorouracil chemotherapy.
Conclusion: The location of the primary tumor influences survival in
breast cancer with inferior outcome for tumors in inner and periareolar
quadrants, especially in high risk groups and those treated with
conservative approaches. The role of aggressive therapies merits
investigation in these patients
Prognostic Significance of Location of the Primary Tumor in Operable Breast Cancers
Background: The prognostic significance of the primary tumor site in
breast cancers is not established with only a few studies having
evaluated the issue. Materials and Methods: The relevance of a primary
tumor site with respect to systemic disease relapse was evaluated in
187 patients with breast cancer treated with primary surgery and
adjuvant chemotherapy, in whom the location of primary tumor was
classifiable in any one of the three sites, namely: outer, periareolar,
and inner, quadrants. Data was obtained from prospectively maintained
records of breast cancer patients treated at a single surgical unit in
a tertiary care center. Results: The three groups were comparable with
regard to demographic, pathological tumor, and treatment
characteristics. In the multivariate analysis, patients with inner and
periareolar quadrant tumors had a higher hazard for systemic disease
relapse, (2.53, 95% CI: 1.18-5.42; P = 0.02, and 2.73, 95% CI:
1.04-7.14; P = 0.04, respectively) as compared to outer quadrant
tumors. The projected five-year survival estimates in Kaplan Meier were
87%, 61%, and 69%, respectively, for outer, periareolar, and inner
quadrant. On further substratification the difference was particularly
noted in high risk inner quadrant tumors: age ≤ 45, premenopausal
patients, tumor size> 2 cms, positive nodes and intermediate or high
grade histology, as also in patients treated with breast conservation
and CMF, Cyclophosphamide, Methorexate, 5 Fluorouracil chemotherapy.
Conclusion: The location of the primary tumor influences survival in
breast cancer with inferior outcome for tumors in inner and periareolar
quadrants, especially in high risk groups and those treated with
conservative approaches. The role of aggressive therapies merits
investigation in these patients