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Masking a singularity with k-essence fields in an emergent gravity metric
emergent gravity metric
2010/11/16
It is known that dynamical solutions of the k-essence equation of motion change the metric for
the perturbations around these solutions and the perturbations propagate in an emergent spacetime with m...
Observational signatures of pre-inflationary and lower-dimensional effective gravity
inflationaty perturbations modi ed dispersion relations quantum gravity phenomenology
2010/11/10
Several alternative ways to quantize gravitational interactions seem to indicate that gravity at short distances is e ectively two-dimensional. If this were true, and the energy scale at which the dim...
MOND reveals the thermodynamics of gravity
Cosmology and Extragalactic Astrophysics (astro-ph.CO) General Relativity and Quantum Cosmology (gr-qc)
2010/12/23
We show that treating gravitation as a thermodynamical theory leads to the modified Newton dynamics (MOND) equations if one takes into account the Hubble's expansion. Then the universal MOND accelerat...
Magnetohydrostatic equilibrium in starspots: dependences on color (T_{eff}) and surface gravity (g)
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/23
Temperature contrasts and magnetic field strengths of sunspot umbrae broadly follow the thermal-magnetic relationship obtained from magnetohydrostatic equilibrium.