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The Generalized Second Law of Thermodynamics in Cosmology
A classical and quantum mechanical generalized second law of thermodynamics in cosmology implies constraints on the effective equation of state of the universe in the form of energy conditions,Expand
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Wald's entropy is equal to a quarter of the horizon area in units of the effective gravitational coupling
The Bekenstein-Hawking entropy of black holes in Einstein's theory of gravity is equal to a quarter of the horizon area in units of Newton's constant. Wald has proposed that in general theories ofExpand
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Entanglement interpretation of black hole entropy in string theory
We show that the entropy resulting from the counting of microstates of non extremal black holes using field theory duals of string theories can be interpreted as arising from entanglement. TheExpand
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A model of graceful exit in string cosmology
We construct, for the first time, a model of graceful exit transition from a dilaton-driven inflationary phase to a decelerated Friedmann-Robertson-Walker era. Exploiting a demonstration thatExpand
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Renormalization group equation and non-perturbative effects in string-field theory
Abstract We derive the renormalization group equation for string field theory and show that it implies the Batalin-Vilkovisky equation and the factorization equations of first quantized stringExpand
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Space-time versus world-sheet renormalization group equation in string theory
Abstract We discuss the relation between space-time renormalization group equation for closed string field theory and world-sheet renormalization group equation for first-quantized strings.Expand
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Challenges for superstring cosmology
Abstract We consider whether current notions about superstring theory below the Planck scale are compatible with cosmology. We find that the anticipated form for the dilaton interaction creates aExpand
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Graceful Exit in String Cosmology
The graceful exit transition from a dilaton-driven inflationary phase to a decelerated Friedmann-Robertson-Walker era requires certain classical and quantum corrections to the string effectiveExpand
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Measuring the equation of state of the universe: Pitfalls and prospects
We explore various pitfalls and challenges in determining the equation of state $(w)$ of the dark energy component that dominates the universe and causes the current accelerated expansion. WeExpand
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Beta Functions and S Matrix in String Theory
Abstract The relationship between sigma model β-functions and string theory scattering amplitudes is proved. We derive our results for the closed bosonic string using the weak field expansion aroundExpand
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