Optical drift effects in general relativity

Korzyński, Mikołaj; Kopiński, Jarosław

doi:10.1088/1475-7516/2018/03/012

Cited by 50 publications

(75 citation statements)

References 94 publications

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“…In such a model there also exist two opposite directions along which radiation is strongly blueshifted [11]. However, the cosmic drift [32][33][34] will cause an observer who was initially in the path of one of those preferred rays to be off it after a while. The time scale of this process should be short, as a consequence of the very large distance between the source and the observer and of the discontinuous change from blueshift to redshift as soon as the strongly blueshifted ray misses the observer.…”

Section: Came Frommentioning

confidence: 99%

Properties of blueshifted light rays in quasispherical Szekeres metrics

Krasiński

2018

Phys. Rev. D

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This paper is a follow-up on two previous ones, in which properties of blueshifted rays were investigated in Lemaître -Tolman (L-T) and quasispherical Szekeres (QSS) spacetimes. In the present paper, an axially symmetric QSS deformation is superposed on such an L-T background that was proved, in the first paper, to mimic several properties of gamma-ray bursts. The present model makes z closer to −1 than in the background L-T spacetime, and, as implied by the second paper, strong blueshifts exist in it only along two opposite directions. The QSS region is matched into a Friedmann background. The Big Bang (BB) function tB(r), which is constant in the Friedmann region, has a gate-shaped hump in the QSS region. Since a QSS island generates stronger blueshifts than an L-T island, the BB hump can be made lower -then it is further removed from the observer and implies a smaller observed angular radius of the source. Consequently, more sources can be fitted into the sky -all these facts are confirmed by numerical computations. Null geodesics reaching present observers from different directions relative to the BB hump are numerically calculated. Patterns of redshift across the image of the source and along the rays are displayed.

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Section: Came Frommentioning

confidence: 99%

Properties of blueshifted light rays in quasispherical Szekeres metrics

Krasiński

2018

Phys. Rev. D

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“…(3.35) of Korzyński & Kopiński (2018). The general relativistic corrections (Korzyński & Kopiński 2018;Marcori et al 2018) are even smaller. See Eq.…”

Section: Accelerationsmentioning

confidence: 94%

The effect of our local motion on the Sandage–Loeb test of the cosmic expansion

Inoue

Komatsu

Aoki

et al. 2019

Publications of the Astronomical Society of Japan

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Redshifts of an astronomical body measured at multiple epochs (e.g., separated by 10 years) are different due to the cosmic expansion. This so-called Sandage-Loeb test offers a direct measurement of the expansion rate of the Universe. However, acceleration in the motion of Solar System with respect to the cosmic microwave background also changes redshifts measured at multiple epochs. If not accounted for, it yields a biased cosmological inference. To address this, we calculate the acceleration of Solar System with respect to the Local Group of galaxies to quantify the change in the measured redshift due to local motion. Our study is motivated by the recent determination of the mass of Large Magellanic Cloud (LMC), which indicates a significant fraction of the Milky Way mass. We find that the acceleration towards the Galactic Center dominates, which gives a redshift change of 7 cm/s in 10 years, while the accelerations due to LMC and M31 cannot be ignored depending on lines of sight. We create all-sky maps of the expected change in redshift and the corresponding uncertainty, which can be used to correct for this effect.

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“…along the whole γ 0 , and because the component ξ 3 does not couple with the other three. ξ 3 is also irrelevant from the point of view of geometric optics [2,16]. The cross-section of S by the screen spanned by e µ A is spacelike and Lorentz-invariant everywhere along the geodesic.…”

Section: Preliminariesmentioning

confidence: 99%

Testing the null energy condition with precise distance measurements

Korzyński,

Serbenta

2021

Preprint

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We present an inequality between two types of distance measures to a single source in general relativity. It states that for a given emitter and observer the distance between them measured by the trigonometric parallax is never shorter than the angular diameter distance provided that the null energy condition holds and that there are no focal points in between. This result is independent of the details of the spacetime geometry or the motions of the observer and the source. The proof is based on the geodesic bilocal operator formalism together with well known properties of infinitesimal light ray bundles. Observation of the violation of the distance inequality would mean that on large scales either the null energy condition does not hold or that light does not travel along null geodesics.

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Optical drift effects in general relativity

Cited by 50 publications

References 94 publications

Properties of blueshifted light rays in quasispherical Szekeres metrics

Properties of blueshifted light rays in quasispherical Szekeres metrics

The effect of our local motion on the Sandage–Loeb test of the cosmic expansion

Testing the null energy condition with precise distance measurements

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