Magnetostatic Volume Waves

Weinberg, I. J.; Sethares, J.C.

doi:10.1109/mwsym.1983.1130875

Cited by 40 publications

(64 citation statements)

References 3 publications

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“…Interest in that question has grown with the gradual realization that some of these parameters appear fine-tuned for life, in the sense that small relative changes to their values would result in dramatic qualitative changes that could preclude intelligent life, and hence the very possibility of reflective observation. As discussed extensively elsewhere [9,10,11,12,13,14,15,16,17,18,19,20,21,22], there are four common responses to this realization:…”

Section: B the Origin Of The Dimensionless Numbersmentioning

confidence: 99%

Dimensionless constants, cosmology, and other dark matters

et al. 2006

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We identify 31 dimensionless physical constants required by particle physics and cosmology, and emphasize that both microphysical constraints and selection effects might help elucidate their origin. Axion cosmology provides an instructive example, in which these two kinds of arguments must both be taken into account, and work well together. If a Peccei-Quinn phase transition occurred before or during inflation, then the axion dark matter density will vary from place to place with a probability distribution. By calculating the net dark matter halo formation rate as a function of all four relevant cosmological parameters and assessing other constraints, we find that this probability distribution, computed at stable solar systems, is arguably peaked near the observed dark matter density. If cosmologically relevant WIMP dark matter is discovered, then one naturally expects comparable densities of WIMPs and axions, making it important to follow up with precision measurements to determine whether WIMPs account for all of the dark matter or merely part of it.

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Section: B the Origin Of The Dimensionless Numbersmentioning

confidence: 99%

Dimensionless constants, cosmology, and other dark matters

et al. 2006

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“…Our interest is to calculate the expectation value of a quantum operatorN p (t) at a given time t, which represents the number of axions occupying a quantum state labeled by three-momentum p. Such a problem can be dealt by using the in-in formalism (or Schwinger-Keldysh formalism) [5]. In cosmology, this formalism was applied to calculate quantum contributions to cosmological correlations [10,11]. Following such a formalism closely, in this work, we calculate the time evolution of the occupation number in a systematic way by use of the perturbative expansion.…”

Section: Axion Field Dynamicsmentioning

confidence: 99%

Evolution and thermalization of dark matter axions in the condensed regime

Saikawa

Yamaguchi

2013

Phys. Rev. D

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We discuss the possibility that dark matter axions form a Bose-Einstein condensate (BEC) due to the gravitational self interactions. The formation of BEC occurs in the condensed regime, where the transition rate between different momentum states is large compared to the energy exchanged in the transition. The time evolution of the quantum state occupation number of axions in the condensed regime is derived based on the in-in formalism. We recover the expression for the thermalization rate due to self interaction of the axion field, which was obtained in the other literature. It is also found that the leading order contributions for interactions between axions and other species vanish, which implies that the axion BEC does not give any significant modifications on standard cosmological parameters.

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“…Nonperturbative techniques are needed to establish the existence of such a fixed point when the number of colors and flavours is taken to be three and the number of UV light flavours is large but finite. Asymptotic safety was originally introduced by Weinberg [35] to address quantum aspects of gravity [36][37][38][39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Quantum critical behavior of semisimple gauge theories

2016

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We study the perturbative phase diagram of semi-simple fermionic gauge theories resembling the Standard Model. We investigate an SU(N) gauge theory with M Dirac flavors where we gauge first an SU(M) L and then an SU (2) (1) of the theory. To avoid gauge anomalies we add lepton-like particles. At the two-loops level an intriguing phase diagram appears. We uncover phases in which one, two or three fixed points exist and discuss the associated flows of the coupling constants. We discover a phase featuring complete asymptotic freedom and simultaneously an interacting infrared fixed point in both couplings. The analysis further reveals special renormalisation group trajectories along which one coupling displays asymptotic freedom and the other asymptotic safety, while both flowing in the infrared to an interacting fixed point. These are safety free trajectories. We briefly sketch out possible phenomenological implications, among which an independent way to generate near-conformal dynamics a lá walking is investigated.

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Magnetostatic Volume Waves

Cited by 40 publications

References 3 publications

Dimensionless constants, cosmology, and other dark matters

Dimensionless constants, cosmology, and other dark matters

Evolution and thermalization of dark matter axions in the condensed regime

Quantum critical behavior of semisimple gauge theories

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