Constraining extra-spatial dimensions with observations of GW170817

Chakravarti, K.; Chakraborty, Sumanta; Phukon, K. S.; Bose, S.; SenGupta, Soumitra

doi:10.1088/1361-6382/ab8355

Cited by 54 publications

(33 citation statements)

References 81 publications

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“…According to some of the theories with extra dimensions, gravitational waves simply would leak into them, causing their weakening under propagation in the universe. This effect, however, was not found in the GW170817 neutron stars coalescence event [11]. Meanwhile, further investigations are active, see recent papers and reference therein [12][13][14].…”

Section: Introductionmentioning

confidence: 94%

Synchrotron radiation in odd dimensions

Gal'Tsov

Khlopunov

2020

Phys. Rev. D

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In odd space-time dimensions, the retarded solution of the massless wave equation has support not only on the light cone, but also inside it. At the same time, a free massless field should propagate at the speed of light. The apparent contradiction of these two features is resolved by the fact that the emitted part of the field in the wave zone depends on the history of motion up to the retarded moment of proper time. It is shown that in the case of circular motion with ultrarelativistic velocity, the main contribution to the radiation amplitude is made by a small interval of proper time preceding the retarded time, and thus the tail term is effectively localized. We obtain a tentative formula for scalar synchrotron radiation in D dimensions: P = g 2 (ω 0 γ 2 / √ 3) D−2 , which is explicitly verified in D = 3, 4, 5.

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Section: Introductionmentioning

confidence: 94%

Synchrotron radiation in odd dimensions

Gal'Tsov

Khlopunov

2020

Phys. Rev. D

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“…If the tidal deformability of black holes is indeed vanishing (or if it is very small), studying tidal effects in mergers of black holes could put constraints on horizon-level spacetime corrections [81]. The tidal deformability can therefore also be used to test the nature of the coalescing compact objects [82][83][84][85][86], or other physics such as dark matter and extra dimensions [87][88][89][90].…”

Section: The Tidal Deformability Of a Black Holementioning

confidence: 99%

Neutron-star tidal deformability and equation-of-state constraints

2020

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Despite their long history and astrophysical importance, some of the key properties of neutron stars are still uncertain. The extreme conditions encountered in their interiors, involving matter of uncertain composition at extreme density and isospin asymmetry, uniquely determine the stars' macroscopic properties within General Relativity. Astrophysical constraints on those macroscopic properties, such as neutron star masses and radii, have long been used to understand the microscopic properties of the matter that forms them. In this article we discuss another astrophysically observable macroscopic property of neutron stars that can be used to study their interiors: their tidal deformation. Neutron stars, much like any other extended object with structure, are tidally deformed when under the influence of an external tidal field. In the context of coalescences of neutron stars observed through their gravitational wave emission, this deformation, quantified through a parameter termed the tidal deformability, can be measured. We discuss the role of the tidal deformability in observations of coalescing neutron stars with gravitational waves and how it can be used to probe the internal structure of Nature's most compact matter objects. Perhaps inevitably, a large portion of the discussion will be dictated by GW170817, the most informative confirmed detection of a binary neutron star coalescence with gravitational waves as of the time of writing.

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“…Possible constraints on extra dimensions from weak field tests of gravity [37], electromagnetic observations of quasars [38][39][40], collision of binary black holes and neutron stars [20][21][22][23] and calculation of quadrupole moment [41] have already been reported. In this paper we investigate the shadow of such braneworld black holes in light of the observed silhouette of M87* by the Event Horizon Telescope collaboration.…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, the measurement of the shadow of the supermassive black hole M87* also has its own limitations [4][5][6][7][8]. Implications of various alternative theories of gravity have been discussed in detail in the context of gravitational wave observations [20][21][22][23], however a similar discussion for black hole shadow from M87* is lacking. To fill this gap, in this work we will discuss the implications of the observed black hole shadow from M87* on theories beyond general relativity and the associated observables.…”

Section: Introductionmentioning

confidence: 99%

Silhouette of M87*: A new window to peek into the world of hidden dimensions

2020

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The recent observation of the shadow of the supermassive black hole M87*, located at the centre of the M87 galaxy, by the Event Horizon Telescope collaboration has opened up a new window to probe the strong gravity regime. In this paper, we explicitly demonstrate the consequences of this observation on brane world black hole, whose characteristic feature being existence of a negative tidal charge. Our results are based on three observables associated with the shadow of M87*, namely, deviation from circularity, axis ratio and angular diameter of the shadow. These explicitly demonstrate that the existence of a negative tidal charge parameter, marking a deviation from general relativity, is more favoured.

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Constraining extra-spatial dimensions with observations of GW170817

Cited by 54 publications

References 81 publications

Synchrotron radiation in odd dimensions

Synchrotron radiation in odd dimensions

Neutron-star tidal deformability and equation-of-state constraints

Silhouette of M87*: A new window to peek into the world of hidden dimensions

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