Is it possible to see the infinite future of the Universe when falling into a black hole?

Grib, A. A.; Pavlov, Yu. V.

doi:10.3367/ufne.0179.200903d.0279

Cited by 15 publications

(17 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This counter-intuitive result is found to be much less surprising when studied in more detail. An especially illuminating description of this effect may be given using so-called Kruskal coordinates [3,4], and it has pedagogic value to introduce the use of these specialized co-ordinates to a wider audience by addressing this particular problem of interest. By focusing primarily on the qualitative character of this observation rather than on its quantitative aspects, one can obtain an appealing and simple description of this nontrivial observation.…”

Section: Introductionmentioning

confidence: 99%

Touching ghosts: observing free fall from an infalling frame of reference into a Schwarzschild black hole

et al. 2011

View full text Add to dashboard Cite

Abstract.The problem of communication between observers in the vicinity of a black hole in a Schwarzschild metric is considered. The classic example of an infalling observer Alice and a static distant mothership MS is extended to include a second infalling observer Bob, who follows Alice in falling towards the event horizon. Kruskal coordinates are introduced to analyze this situation, and the pedagogic value of introducing this alternative coordinate system is demonstrated by their ability to provide a graphically based solution and illustration to this problem. The counterintuitive result that is obtained, which will be of interest to those studying general relativity at an introductory level at final year undergraduate or at graduate level, is that Bob appears to reach a ghostly image of Alice at the event horizon.

show abstract

Section: Introductionmentioning

confidence: 99%

Touching ghosts: observing free fall from an infalling frame of reference into a Schwarzschild black hole

et al. 2011

View full text Add to dashboard Cite

show abstract

“…Surely all results in this paper correspond to exact Kerr's solution. For physically realized rotating black holes as the result of the star collapse due to nonstability of interior solution inside the gravitational radius especially inside the Cauchy horizon (see [28]) the results can be different and the special research is needed.…”

Section: Resultsmentioning

confidence: 99%

High energy particles with negative and positive energies in the vicinity of black holes

Grib¹,

Pavlov²

2014

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract. It is shown that the energy in the centre of mass frame of two colliding particles in free fall at any point of the ergosphere of the rotating black hole can grow without limit for fixed energy values of particles on infinity. The effect takes place for large negative values of the angular momentum of one of the particles. It occurs that the geodesics with negative energy in equatorial plane of rotating black holes cannot originate or terminate inside the ergosphere. Their length is always finite and this leads to conclusion that they must originate and terminate inside the gravitational radius of the ergosphere. The energy in the centre of mass frame of one particle falling into the gravitational radius and the other arriving from the area inside it is growing without limit on the horizon.

show abstract

“…Eq. (8) follows immediately from (6) in the metric (4). If the Killing vector corresponds to rotations, in coordinates (T, y, φ) it has the form (0, 0, 1), so similar to (6) we have L = mu φ .…”

Section: Basic Equationsmentioning

confidence: 92%

“…Meanwhile, there are also other interesting properties of the same class of trajectories discussed in the present work. Namely, we consider the following questions: (i) the maximization of time before reaching the singularity, (ii) possibility for an observer to see during a finite proper time all future of Universe (this issue was discussed in [3], [4] but account of the trajectories under discussion adds new options not noticed there).…”

Section: Introductionmentioning

confidence: 99%

Strategies of motion under the black hole horizon

Toporensky

Заславский

2020

Int. J. Mod. Phys. D

View full text Add to dashboard Cite

In this methodological paper we consider two problems an astronaut faces with under the black hole horizon in the Schwarzschild metric. 1) How to maximize the survival proper time. 2) How to make a visible part of the outer Universe as large as possible before hitting the singularity. Our consideration essentially uses the concept of peculiar velocities based on the "river model". Let an astronaut cross the horizon from the outside. We reproduce from the first principles the known result that point 1) requires that an astronaut turn off the engine near the horizon and follow the path with the momentum equal to zero. We also show that point 2) requires maximizing the peculiar velocity of the observer. Both goals 1) and 2) require, in general, different strategies inconsistent with each other that coincide at the horizon only. The concept of peculiar velocities introduced in a direct analogy with cosmology, and its application for the problems studied in the present paper can be used in advanced general relativity courses.

show abstract

Is it possible to see the infinite future of the Universe when falling into a black hole?

Abstract: A possibility to see the infinite future of the Universe by an astronaut falling into a black hole is discussed and ruled out.Methodological Notes.

Cited by 15 publications

References 20 publications

Touching ghosts: observing free fall from an infalling frame of reference into a Schwarzschild black hole

Touching ghosts: observing free fall from an infalling frame of reference into a Schwarzschild black hole

High energy particles with negative and positive energies in the vicinity of black holes

Strategies of motion under the black hole horizon

Contact Info

Product

Resources

About