Potentiation by neuropeptide Y of histamine H1 receptor-mediated contraction in rat blood vessels

Piao, Honglan; Nagai, Shingo; Tsurumaki, Tatsuru; Niki, Takeshi; Handa, Hiroshi

doi:10.1016/j.vph.2006.10.010

Cited by 6 publications

(6 citation statements)

References 32 publications

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“…It is straightforward to adapt the calculation in [1] to the present, slightly different context (this was already done, with a different motivation, by [29,30]). Here we predict "from first principles", by means of DSR, deformed dispersion relations for the fluctuations.…”

Section: An Adaptation Of the Decaying Speed Of Sound Mechanismmentioning

confidence: 99%

DSR as an explanation of cosmological structure

Magueijo¹

2008

Class. Quantum Grav.

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Deformed special relativity (DSR) is one of the possible realizations of a varying speed of light (VSL). It deforms the usual quadratic dispersion relations so that the speed of light becomes energy dependent, with preferred frames avoided by postulating a non-linear representation of the Lorentz group. The theory may be used to induce a varying speed of sound capable of generating (near) scale-invariant density fluctuations, as discussed in a recent Letter. We identify the non-linear representation of the Lorentz group that leads to scale-invariance, finding a universal result. We also examine the higher order field theory that could be set up to represent it.

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Section: An Adaptation Of the Decaying Speed Of Sound Mechanismmentioning

confidence: 99%

DSR as an explanation of cosmological structure

Magueijo¹

2008

Class. Quantum Grav.

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“…While inflation [3] has dominated the theoretical cosmology scene, interest has never floundered on alternatives, such as pre-big bang cosmology [4,5], ekpyrotic/cyclic models [6,7] and a varying speed of light (VSL) [8,9,10]. In this paper we take recent work on VSL [11,12,13] one step beyond, investigating departures from strict scale-invariance and non-Gaussian signatures.…”

Section: Introductionmentioning

confidence: 99%

Bimetric structure formation: Non-Gaussian predictions

2010

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The minimal bimetric theory employing a disformal transformation between matter and gravity metrics is known to produce exactly scale-invariant fluctuations. It has a purely equilateral non-Gaussian signal, with an amplitude smaller than that of DBI inflation (with opposite sign) but larger than standard inflation. We consider non-minimal bimetric models, where the coupling B appearing in the disformal transformationĝ µν = g µν − B∂ µ φ∂ ν φ can run with φ. For power-law B(φ) these models predict tilted spectra. For each value of the spectral index, a distinctive distortion to the equilateral property can be found. The constraint between this distortion and the spectral index can be seen as a "consistency relation" for non-minimal bimetric models.

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“…To prevent the introduction of a preferred frame one then chooses a suitable non-linear representation of the Lorentz group [12]. In two companion papers we examine the connection between the varying speed of sound mechanism of [1] and these two types of VSL theories, concentrating on the bimetric approach here (see [14][15][16] for connections with the latter).…”

Section: Introductionmentioning

confidence: 99%

Bimetric varying speed of light theories and primordial fluctuations

Magueijo

2009

Phys. Rev. D

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We exhibit a varying speed of light (VSL) theory that implements the recently proposed decaying speed of sound mechanism for generating density fluctuations. We avail ourselves of bimetric VSL theories, where the speed of gravity differs from that of light. We first show that a Dirac-Born-Infeld (DBI) type of $K$-essence has the necessary speed of sound profile to produce (near) scale-invariant fluctuations. We then examine the map between bimetric and $K$-essence models: typically the bi-scalar connecting the two metrics is a $K$-essence field in one of them. Remarkably, the DBI model is found to perturbatively represent the minimal bimetric model, where the bi-scalar is Klein-Gordon in the matter frame. But the full non-perturbative bimetric structure is even simpler: the bi-scalar dynamics should be simply driven by a cosmological constant in the matter frame, balanced by an opposite cosmological constant in the gravity frame. Thus the problem of structure formation receives an elegant and universal solution within bimetric VSL theories, which are known to also solve the flatness and entropy problems and evade a plethora of causality concerns

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Potentiation by neuropeptide Y of histamine H1 receptor-mediated contraction in rat blood vessels

Cited by 6 publications

References 32 publications

DSR as an explanation of cosmological structure

DSR as an explanation of cosmological structure

Bimetric structure formation: Non-Gaussian predictions

Bimetric varying speed of light theories and primordial fluctuations

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