A gravitational wave window on extra dimensions

Clarkson, Chris; Seahra, Sanjeev S.

doi:10.1088/0264-9381/24/9/f01

Cited by 59 publications

(110 citation statements)

References 19 publications

(33 reference statements)

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“…It is worthy to mention the cosmological GWs expected by the brane oscillation scenarios in extra dimensions [42,43]. Frequencies of these GWs can be expended to the THz band from the mHz, and the amplitude of the GWs in the GHz band might reach up to h ∼ 10 −24 to 10 −21 .…”

Section: The Calculation Of Ppf (Signal)mentioning

confidence: 99%

“…For the whole observation time, we can detect the average effect of such sources through the similar reasoning. Even if we consider a conservative condition (i.e., h ∼ 10 −24 , ν = 2.9 GHz [42]), the PPF can reach up to ∼ 10 8 s −1 and minimal accumulation time of signal can be reduced to ∼ 10 4 second. This is satisfactory (see Eq.…”

Section: The Calculation Of Ppf (Signal)mentioning

confidence: 99%

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The signal photon flux, background photons and shot noise in electromagnetic response of high-frequency relic gravitational waves

Jin

Lin

et al. 2011

Gen Relativ Gravit

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On the basis of the electromagnetic response of high frequency relic gravitational waves (HFRGWs), we research on more accurate calculation of signal (i.e. transverse perturbative photon flux (PPF)) and background photons flux (BPF) in the sycro-resonance electromagnetic system, which consists of Gaussian beam (GB), a static magnetic field and fractal membranes. According to the relationship between frequency of gravitational waves and its dimensionless amplitude, we focus on the HFRGWs with ν g = 2.9 GHz, h ∼ 10 −30 in the pre-big bang and quintessential inflationary models. The results show the peak value of the transverse BPF (∼ 10 20 s −1 ) is around |x| = 0.08 m, where |x| is the transverse distance to the longitudinal symmetrical surface of the GB, while the maximum transverse PPF always appears at x = 0 (N (1)x ∼ 2.60 × 10 2 s −1 with the optimal phase difference between the GB and the resonant component of the HFRGWs δ = (n + 0.9)π, n = 0, 1, 2 . . .). However, the observable PPF should be ∼ 1.19 × 10 2 s −1 because of the stochastic nature of the HFRGWs' phase. Since the decay speed of BPF is much quicker than PPF, it is hopeful to figure out the signal in some optimal regions. Moreover, we compare the decay speed of BPF and PPF in nature mode, and find the threshold value of x where PPF exceeds to BPF. It demonstrates that the limitation of our detection sensitivity comes from the strength of PPF rather than swamping by BPF. On the other hand, with the fractal membrane, the comparison between BPF and PPF provides the optimal detection area x ∈ [0.28, 1] m. In addition, through the calculation of shot noise and

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Section: The Calculation Of Ppf (Signal)mentioning

confidence: 99%

Section: The Calculation Of Ppf (Signal)mentioning

confidence: 99%

The signal photon flux, background photons and shot noise in electromagnetic response of high-frequency relic gravitational waves

Jin

Lin

et al. 2011

Gen Relativ Gravit

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“…There are four kind of potential GW sources in the very high frequency and ultrahigh frequency bands: 39 (i) Discrete sources; 173 (ii) Cosmological sources; 174 (iii) Brane-world Kaluza-Klein (KK) mode radiation; 175,176 (iv) Plasma instabilities. 177 In general, objects do not radiate efficiently at wavelengths very different from their size.…”

Section: Very High Frequency and Ultrahigh Frequency Gw Sourcesmentioning

confidence: 99%

Gravitational waves: Classification, methods of detection, sensitivities and sources

Kuroda

Pan

2015

Int. J. Mod. Phys. D

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After giving a brief introduction and presenting a complete classification of gravitational waves (GWs) according to their frequencies, we review and summarize the detection methods, the sensitivities, and the sources. We notice that real-time detections are possible above 300 pHz. Below 300 pHz, the detections are possible on GW imprints or indirectly. We are on the verge of detection. The progress in this field will be promising and thriving. We will see improvement of a few orders to several orders of magnitude in the GW detection sensitivities over all frequency bands in the next hundred years.

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“…It would be interesting and perhaps useful to compare this with the predictions given by Abbot [56]a s well as the revising the issue which is brought up by reference [57]. Keep in mind as well that there has been recent confirmation by Abbot [58] as to the existence of gravitational waves, which further extends what was brought up by Abbot, et al…”

Section: Quotementioning

confidence: 59%

The Transition from Pre-Octonionic to Octonionic Gravity and How It May Be Pertinent to a Re-Do of the HUP for Metric Tensors

Beckwith¹

2017

JHEPGC

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The quantum gravity problem that the notion of a quantum state, representing the structure of space-time at some instant, and the notion of the evolution of the state, does not get traction, since there are no real "instants", is avoided by having initial Octonionic geometry embedded in a larger, nonlinear "pilot model" (semi classical) embedding structure. The Penrose suggestion of re-cycled space time avoiding a "big crunch" is picked as the embedding structure, so as to avoid the "instants" of time issue. Getting Octionic gravity as embedded in a larger, Pilot theory embedding structure may restore Quantum Gravity to its rightful place in early cosmology without the complication of then afterwards "Schrodinger equation" states of the universe, and the transformation of Octonionic gravity to existing space-time is explored via its possible linkage to a new version of the HUP involving metric tensors. We conclude with how specific properties of Octonion numbers algebra influence the structure and behavior of the early-cosmology model. This last point is raised in Section 14, and is akin to a phase transition from Pre-Octonionic geometry, in pre-Planckian space-time, to Octonionic geometry in Planckian space-time. A simple phase transition is alluded to; making this clear is as simple as realizing that Pre-Octonionic is for Pre-Planckian Space-time and Octonionic is for Planckian Space-time. We state that the Standard Model of physics occurs during Planckian Space-time. We also argue that the Standard Model does not apply to Pre Planckian Space-time. This is commensurate with the Octonion number system NOT applying in pre-Planckian spacetime, but applying in Plankian space-time. And the last line of Equation (54) gives a minimum time step in pre-Planckian space-time when we do NOT have the Standard Model of physics, or Octonionic Geometry.

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A gravitational wave window on extra dimensions

Cited by 59 publications

References 19 publications

The signal photon flux, background photons and shot noise in electromagnetic response of high-frequency relic gravitational waves

The signal photon flux, background photons and shot noise in electromagnetic response of high-frequency relic gravitational waves

Gravitational waves: Classification, methods of detection, sensitivities and sources

The Transition from Pre-Octonionic to Octonionic Gravity and How It May Be Pertinent to a Re-Do of the HUP for Metric Tensors

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