Brane-World Dark Matter

Cembranos, J. A. R.; Dobado, Antonio; Maroto, Antonio L.

doi:10.1103/physrevlett.90.241301

Cited by 152 publications

(225 citation statements)

References 29 publications

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“…In addition, given the current lack of a dark matter particle detection (both from astrophysical observations and accelerators), it seems worthwhile to further explore modified gravity alternatives. It is worth mentioning that, even if dark matter is a new particle, it might give us some hints about modifications to gravity that could explain cosmic acceleration [179,180].…”

Section: Gravity In Cosmologymentioning

confidence: 99%

BeyondΛCDM: Problems, solutions, and the road ahead

Bull

Akrami

Adamek

et al. 2016

Physics of the Dark Universe

442

210

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Despite its continued observational successes, there is a persistent (and growing) interest in extending cosmology beyond the standard model, ΛCDM. This is motivated by a range of apparently serious theoretical issues, involving such questions as the cosmological constant problem, the particle nature of dark matter, the validity of general relativity on large scales, the existence of anomalies in the CMB and on small scales, and the predictivity and testability of the inflationary paradigm. In this paper, we summarize the current status of ΛCDM as a physical theory, and review investigations into possible alternatives along a number of different lines, with a particular focus on highlighting the most promising directions. While the fundamental problems are proving reluctant to yield, the study of alternative cosmologies has led to considerable progress, with much more to come if hopes about forthcoming high-precision observations and new theoretical ideas are fulfilled.Keywords: cosmology -dark energy -cosmological constant problem -modified gravitydark matter -early universe Cosmology has been both blessed and cursed by the establishment of a standard model: ΛCDM. On the one hand, the model has turned out to be extremely predictive, explanatory, and observationally robust, providing us with a substantial understanding of the formation of large-scale structure, the state of the early Universe, and the cosmic abundance of different types of matter and energy. It has also survived an impressive battery of precision observational tests -anomalies are few and far between, and their significance is contentious where they do arise -and its predictions are continually being vindicated through the discovery of new effects (B-mode polarization [1] and lensing [2,3] of the cosmic microwave background (CMB), and the kinetic Sunyaev-Zel'dovich effect [4] being some recent examples). These are the hallmarks of a good and valuable physical theory.On the other hand, the model suffers from profound theoretical difficulties. The two largest contributions to the energy content at late times -cold dark matter (CDM) and the cosmological constant (Λ) -have entirely mysterious physical origins. CDM has so far evaded direct detection by laboratory experiments, and so the particle field responsible for it -presumably a manifestation of "beyond the standard model" particle physics -is unknown. Curious discrepancies also appear to exist between the predicted clustering properties of CDM on small scales and observations. The cosmological constant is even more puzzling, giving rise to quite simply the biggest problem in all of fundamental physics: the question of why Λ appears to take such an unnatural value [5,6,7]. Inflation, the theory of the very early Universe, has also been criticized for being fine-tuned and under-predictive [8], and appears to leave many problems either unsolved or fundamentally unresolvable. These problems are indicative of a crisis.From January 14th-17th 2015, we held a conference in Oslo, Norway to surve...

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Section: Gravity In Cosmologymentioning

confidence: 99%

BeyondΛCDM: Problems, solutions, and the road ahead

Bull

Akrami

Adamek

et al. 2016

Physics of the Dark Universe

442

210

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“…This is again the case for some particular supersymmetric, universal extra dimensions or little Higgs models. In this work, however, we point out that the brane-world scenario, originally proposed as a new setting for solving the gauge hierarchy problem [9], is also a viable alternative here.Recently it has been found that massive brane fluctutations (branons) are natural candidates to dark matter in brane-world models with low tension [10,11]. Branon physics can be described at low energies by an effective action which depends essentially on only three parameters: the branon mass M, the brane tension scale f and the cutoff which sets the range of validity of the effective theory.…”

mentioning

confidence: 99%

“…Recently it has been found that massive brane fluctutations (branons) are natural candidates to dark matter in brane-world models with low tension [10,11]. Branon physics can be described at low energies by an effective action which depends essentially on only three parameters: the branon mass M, the brane tension scale f and the cutoff which sets the range of validity of the effective theory.…”

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confidence: 99%

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Dark matter clues in the muon anomalous magnetic moment

2006

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We study the possibility to explain the nonbaryonic dark matter abundance and improve the present fits on the muon anomalous magnetic moment through the same new physics. In this work we show that massive brane fluctuations (branons) in large extra-dimensions models can provide an economical way to deal with these two issues. This is so because the low-energy branon physics depends effectively on essentially only three parameters. Next collider experiments, such as LHC or ILC, will be sensitive to branon phenomenology in the natural parameter region where the theory is able to account for the two effects. DOI: 10.1103/PhysRevD.73.057303 PACS numbers: 13.40.Em, 11.25.Mj, 14.60.Ef, 95.35.+d The existence of dark matter (DM) is one of the longstanding problems in astrophyiscs and cosmology, dating back to the early thirties when F. Zwicky observed for the first time that the total and visible masses of rich galaxies disagree in a factor 10 -100. Since then, additional evidence has been obtained from galaxy rotation curves, galaxy motions in clusters and, more recently, by precise measurements of the temperature fluctuations of the Cosmic Microwave Background (CMB) radiation [1], Type Ia supernovae, large scale distribution of galaxies or Ly clouds.The fact that all these data seems to strongly suggest that the total amount of DM cannot be made of known particles is one of the most pressing arguments for the existence of New Physics (NP), be it in the form of new particles or as a modificaction of gravity at large distances. The most favored particle candidate to account for the DM energy density is a Weakly Interacting Massive Particle (WIMP) which can provide us with the nonbaryonic DM abundance NBDM h 2 0:095-0:129 measured by WMAP [1], in the form of a standard thermal relic. Decoupling from thermal equilibrium typically occurs at T M=20, where M is the mass of the WIMP which we are equaling to the scale of NP, NP M. If we assume a typical annihilation cross section A 2 = 2 NP (where is the electromagnetic coupling constant), the present abundance can be roughly estimated to be Wimp NP = 100 GeV 2 . The interesting feature of this result is that the NP which is able to explain the missing matter problem ( Wimp h 2 0:1), could be related with the electroweak sector ( NP 100 GeV) and be accessible in the next generation of collider experiments. The most popular WIMP candidate is the stable lightest supersymmetric particle which typically corresponds to a neutralino [2] but other candidates have been proposed recently in the context of universal extra dimension theories [3] and little Higgs models (see [4] for a recent review), where some discrete symmetry stabilizes the lightest neutral new particle.On the other hand, the success of the Standard Model (SM) of particles and interactions has been tested in many different experiments without finding very important discrepancies so far. A very remarkable example is the electron magnetic moment:~e g e e= 2m e s, whose gyromagnetic ratio deviates from the value g e ...

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“…However there is not evidence of CP T violation in any experiment, and on the contrary, there are important tests that constrain the amount of non conservation of CP T in various sectors of the standard model of particles and interactions. A large number of models have been proposed in literature where CP T violations can be accommodated, as the standard-model extension associated with spontaneous breaking of the Lorentz symmetry in the string theory [4]; spacetime foam models motivated by quantum-gravity (QG) [5]; deformations of special relativity [6] or modified gravity [7]; non-local models originated from string theory [8]; or Lorentz symmetry breaking in extra dimensional models [9].…”

Section: Introductionmentioning

confidence: 99%