Unparticle constraints from supernova 1987A

Hannestad, Steen; Raffelt, Georg G.; Wong, Yvonne Y. Y.

doi:10.1103/physrevd.76.121701

Cited by 67 publications

(35 citation statements)

References 45 publications

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“…The forthcoming start of LHC activity has focused the interest of the high energy physics community on possible experimental signature of un-particles events at the T eV energy scale [4,5,6,7,8] [9,10,11,12] [24,25]. Astroparticle and cosmological un-particle effects have been considered as well [13,14,15,16], [17,18,19,20,21], [22,23]. On the theoretical side, interesting connections between un-particles and nonstandard Kaluza-Klein dynamics in extra-dimensions, and AdS/CFT duality, have been pointed out in [26,27,28,29,30].…”

Section: Introductionmentioning

confidence: 99%

Un-graviton corrections to the Schwarzschild black hole

2010

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We introduce an effective action smoothly extending the standard Einstein-Hilbert action to include un-gravity effects. The improved field equations are solved for the Un-graviton corrected Schwarzschild geometry reproducing the Mureika result. This is an important test to confirm the original "guess" of the form of the Un-Schwarzschild metric. Instead of working in the weak field approximation and "dressing" the Newtonian potential with un-gravitons, we solve the "effective Einstein equations" including all order un-gravity effects. An unexpected "bonus" of accounting un-gravity effects is the fractalisation of the event horizon. In the ungravity dominated regime the event horizon thermodynamically behaves as fractal surface of dimensionality twice the scale dimension d U .

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Section: Introductionmentioning

confidence: 99%

Un-graviton corrections to the Schwarzschild black hole

2010

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“…Various studies recognized important phenomenological [6,[9][10][11][12][13][14][15][16], astrophysical [17][18][19] and cosmological [20][21][22][23][24][25][26][27][28] consequences of unparticles. The consequences of the existence of scalar unparticles in the neutrino sector have also been studied.…”

Section: Introductionmentioning

confidence: 99%

Oscillation dynamics of active-unsterile neutrino mixing in a2+1˜mixing scheme

2010

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We consider the possibility that sterile neutrinos exist and admit a description as unparticles;we call these unsterile neutrinos. We then examine the nature of neutrino oscillations in a model where an unsterile can mix with two active flavors with a very simple mass matrix of the see-saw type. Despite these simplifications, we find a number of remarkable features, all of which will occur generically when more realistic cases are considered. These include momentum dependent mixing angles, "invisible" decay widths for the unsterile-like mode, as well as the inheritance of a non-vanishing spectral density for the massive active-like modes. We also obtain the disappearance and appearance probabilities for the active-like neutrinos and find remarkable interference effects between the active and unsterile neutrinos as a consequence of threshold effects, yielding new oscillatory contributions with different oscillation lengths. These effects are only measurable on short baseline experiments because there both probabilities are suppressed as compared to mixing with a canonical sterile neutrino, thereby providing a diagnostics tool to discriminate unsterile from canonical sterile neutrinos. We conclude with a discussion of whether these new phenomena could aid in the reconciliation of the LSND and MiniBooNE results.

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“…Dubbed "unparticle physics" because of the non-intuitive phase space structure, its introduction has caused a flurry of research into modifications to known physics and post-TeV predictions. Accelerator phenomenology has been the main emphasis in the literature [3][4][5][6][7][8][9][10] [11,12], but astrophysical/cosmological [13][14][15][16][17][18] [19][20][21][22][23][24] [ [25][26][27], low to ultra-high neutrino phenomenology [28][29][30][31][32][33][34][35] and general quantum field theory [36][37][38][39][40][41] [42,43] applications have been of extreme importance as well.…”

Section: Introductionmentioning

confidence: 99%

Vector unparticle enhanced black holes: Exact solutions and thermodynamics

Mureika¹,

Spallucci²

2010

Physics Letters B

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Tensor and scalar unparticle couplings to matter have been shown to enhance gravitational interactions and provide corrections to the Schwarzschild metric and associated black hole structure. We derive an exact solution to the Einstein equations for vector unparticles, and conclusively demonstrate that these induce Riessner-Nordström (RN)-like solutions where the role of the "charge" is defined by a composite of unparticle phase space parameters. These black holes admit double-horizon structure, although unlike the RN metric these solutions have a minimum inner horizon value. In the extremal limit, the Hawking temperature is shown to vanish. As with the scalar/tensor case, the (outer) horizon is shown via entropy considerations to behave like a fractal surface of spectral dimension d H = 2d U .

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Unparticle constraints from supernova 1987A

Cited by 67 publications

References 45 publications

Un-graviton corrections to the Schwarzschild black hole

Un-graviton corrections to the Schwarzschild black hole

Oscillation dynamics of active-unsterile neutrino mixing in a2+1˜mixing scheme

Vector unparticle enhanced black holes: Exact solutions and thermodynamics

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