4,253 research outputs found
Understanding Gravity: Some Extra Dimensional Perspectives
Gravity is one of the most inexplicable forces of nature, controlling
everything, from the expansion of the Universe to the ebb and flow of ocean
tides. The search for the laws of motion and gravitation began more than two
thousand years ago but still we do not have the complete picture of it. In this
article, we have outlined how our understanding of gravity is changing
drastically with time and how the previous explanations have shaped the most
recent developments in the field like superstrings and braneworlds.Comment: 21 page
Gravity and Large Extra Dimensions
The idea that quantum gravity can be realized at the TeV scale is extremely
attractive to theorists and experimentalists alike. This proposal leads to
extra spacial dimensions large compared to the electroweak scale. Here we give
a very systematic view of the foundations of the theories with large extra
dimensions and their physical consequences.Comment: 26 pages, 3 diagram
Plasmon Annihilation into Kaluza-Klein Graviton: New Astrophysical Constraints on Large Extra Dimensions
In large extra dimensional Kaluza-Klein (KK) scenario, where the usual
Standard Model (SM) matter is confined to a 3+1-dimensional hypersurface called
the 3-brane and gravity can propagate to the bulk (D=4+d, d being the number of
extra spatial dimensions), the light graviton KK modes can be produced inside
the supernova core due to the usual nucleon-nucleon bremstrahlung,
electron-positron and photon-photon annihilations. This photon inside the
supernova becomes plasmon due to the plasma effect. In this paper, we study the
energy-loss rate of SN 1987A due to the KK gravitons produced from the
plasmon-plasmon annihilation. We find that the SN 1987A cooling rate leads to
the conservative bound > 22.9 TeV and 1.38 TeV for the case of two and
three space-like extra dimensions.Comment: 13 pages, 1 ps figure, text is modified a little bit, conclusion
unchanged, new references are added, version accepted for publication in PR
Designing of MATLAB Program for Various Fuzzy Quality Regions in CSP-MLP-T-3 Sampling plan
In this paper, an optimal designing methodology is proposed to determine the parameters for Multi-Level Continuous Sampling Plans CSP-MLP-T-3, when the lifetime of the product follows generalized exponential distribution. The two points on the operating characteristic curve approach are used to find the optimal parameters for the proposed plan. The plan parameters are determined through Quality Decision Region
Supernovae as Probes of Extra Dimensions
Since the dawn of the new millennium, there has been a revived interest in
the concept of extra dimensions.In this scenario all the standard model matter
and gauge fields are confined to the 4 dimensions and only gravity can escape
to higher dimensions of the universe.This idea can be tested using table-top
experiments, collider experiments, astrophysical or cosmological observations.
The main astrophysical constraints come from the cooling rate of supernovae,
neutron stars, red giants and the sun. In this article, we consider the energy
loss mechanism of SN1987A and study the constraints it places on the number and
size of extra dimensions and the higher dimensional Planck scale.Comment: 5 pages, no figures, new references are adde
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