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Entropy bounds and dark energy
Abstract Entropy bounds render quantum corrections to the cosmological constant Λ finite. Under certain assumptions, the natural value of Λ is of order the observed dark energy density ∼10 −10  eV 4Expand
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Composite Higgs from higher representations
We investigate new models of dynamical electroweak symmetry breaking resulting from the condensation of fermions in higher representations of the technicolor group. These models lie close to theExpand
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Minimum Length from Quantum Mechanics and General Relativity
We derive fundamental limits on measurements of position, arising from quantum mechanics and classical general relativity. First, we show that any primitive probe or target used in an experiment mustExpand
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Solutions to the strong-CP problem in a world with gravity☆
We examine various solutions of the strong-CP problem to determine their sensitivity to possible violations of global symmetries by Plauck scale physics. While some solutions remain viable even inExpand
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Colorful quantum black holes at the LHC
We examine the LHC phenomenology of quantum black holes in models of TeV gravity. By quantum black holes we mean black holes of the smallest masses and entropies, far from the semiclassical regime.Expand
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What is the entropy of the universe
Standard calculations suggest that the entropy of our universe is dominated by black holes, whose entropy is of order their area in Planck units, although they comprise only a tiny fraction of itsExpand
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Minimum length from quantum mechanics and classical general relativity.
We derive fundamental limits on measurements of position, arising from quantum mechanics and classical general relativity. First, we show that any primitive probe or target used in an experiment mustExpand
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Minimum length from first principles
We show that no device or gedanken experiment is capable of measuring a distance less than the Planck length. By "measuring a distance less than the Planck length" we mean, technically, resolve theExpand
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Black hole entropy, curved space and monsters
We investigate the microscopic origin of black hole entropy, in particular the gap between the maximum entropy of ordinary matter and that of black holes. Using curved space, we constructExpand
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Gradient instability for w<−1
Abstract We show that in single scalar field models of the dark energy with equations of state satisfying w ≡ p / ρ − 1 , the effective Lagrangian for fluctuations about the homogeneous backgroundExpand
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