Noncommutative models in patch cosmology
TL;DR: In this paper, the effects of non-commutativity on scalar and tensor perturbations to a noncommutative brane embedded in a commutative bulk are analyzed in a number of ways and energy regimes.
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Abstract: We consider several classes of noncommutative inflationary models within an extended version of patch cosmological braneworlds, starting from a maximally invariant generalization of the action for scalar and tensor perturbations to a noncommutative brane embedded in a commutative bulk. Slow-roll expressions and consistency relations for the cosmological observables are provided, both in the UV and IR region of the spectrum; the inflaton field is assumed to be either an ordinary scalar field or a Born-Infeld tachyon. The effects of noncommutativity are then analyzed in a number of ways and energy regimes.
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Dynamics of dark energy
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D-brane-anti-D-brane effective action and brane interaction in open string channel
TL;DR: In this paper, the Chan-Paton factors of two non-BPS Dp-branes in the action were restricted to the ChanPaton factor of a Dpp system, and the action reduced to the one proposed by A. Sen.
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Stochastic gravitational-wave background in quantum gravity
TL;DR: In this paper, the authors explore five cosmological quantum-gravity models and check whether they can generate a stochastic gravitational-wave background detectable by present and future interferometers: non-local quantum gravity, string-gas cosmology, new ekpyrotic scenario, Brandenberger-Ho noncommutative inflation and multi-fractional spacetimes.
D-brane anti-D-brane effective action and brane interaction in open string channel
TL;DR: In this paper, the authors constructed the effective action of a non-abelian extension of tachyonic DBI action by restricting the Chan-Paton factors of two non-BPS $D_p$-branes in the action.
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