Browsing by Author "Kavic, Michael"
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- Fine Structure of Dark Energy and New PhysicsJejjala, Vishnu; Kavic, Michael; Minic, Djordje (Hindawi Publishing Corporation, 2007)Following our recent work on the cosmological constant problem, in this letter we make a specific proposal regarding the fine structure (i.e., the spectrum) of dark energy. The proposal is motivated by a deep analogy between the blackbody radiation problem, which led to the development of quantum theory, and the cosmological constant problem, for which we have recently argued calls for a conceptual extension of the quantum theory. We argue that the fine structure of dark energy is governed by a Wien distribution, indicating its dual quantum and classical nature. We discuss observational consequences of such a picture of dark energy and constrain the distribution function. Copyright (C) 2007 Vishnu Jejjala et al.
- Modeling Time's ArrowJejjala, Vishnu; Kavic, Michael; Minic, Djordje; Tze, Chia-Hsiung (MDPI, 2012-04)Quantum gravity, the initial low entropy state of the Universe, and the problem of time are interlocking puzzles. In this article, we address the origin of the arrow of time from a cosmological perspective motivated by a novel approach to quantum gravitation. Our proposal is based on a quantum counterpart of the equivalence principle, a general covariance of the dynamical phase space. We discuss how the nonlinear dynamics of such a system provides a natural description for cosmological evolution in the early Universe. We also underscore connections between the proposed non-perturbative quantum gravity model and fundamental questions in non-equilibrium statistical physics.
- Transient pulses from exploding primordial black holes as a signature of an extra dimensionKavic, Michael; Simonetti, John H.; Cutchin, Sean E.; Ellingson, Steven W.; Patterson, Cameron D. (IOP, 2008-11-01)An evaporating black hole in the presence of an extra spatial dimension would undergo an explosive phase of evaporation. We show that such an event, involving a primordial black hole, can produce a detectable, distinguishable electromagnetic pulse, signaling the existence of an extra dimension of size L ∼ 10−18 − 10−20 m. We derive a generic relationship between the Lorentz factor of a pulse-producing “fireball” and the TeV energy scale. For an ordinary toroidally compactified extra dimension, transient radio-pulse searches probe the electroweak energy scale (∼0.1 TeV), enabling comparison with the Large Hadron Collider.