Critical Thoughts on Cosmology

Kundt, Wolfgang; Novello, M.; Perez, Santiago

doi:10.1063/1.3151843

Cited by 5 publications

(7 citation statements)

References 31 publications

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“…A Uniform Description of All the Astrophysical Jets ing Disks (BDs), which act analogously to heavy, magnetised rotators, via their strongly shearing inner-galactic diskal coronas [Kundt 1979[Kundt , 1990[Kundt , 1996[Kundt , 2001[Kundt , 2005[Kundt , 2009a; 2011a,b,c, Kundt & Krishna 1980, 2004. They share the magnetic reconnections, the buoyant escape, the postacceleration by their LFWs, and self-blown deLaval nozzles with the stellar CEs, thus creating quite similar-functioning twin jets.…”

Section: Pos(frapws2014)025mentioning

confidence: 99%

A Uniform Description of All the Astrophysical Jets

Kundt¹

2016

Proceedings of Frontier Research in Astrophysics — PoS(FRAPWS2014)

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In this talk (at Mondello) I attempt to sketch my understanding of the universal working scheme of all the astrophysical jet sources, or 'bipolar flows', on both stellar and galactic scales, also called 'microquasars', and 'quasars'. A crucial building block will be their medium: extremely relativistic e ±-pair plasma performing quasi loss-free E x B-drifts through self-rammed channels, whose guiding equi-partition E-and B-fields convect the electric potential necessary for eventual single-step post-acceleration, at their 'knots' and terminating 'hotspots', or 'heads'. These electromagnetic fields convect half of the jet's power. The indispensible pair plasma is generated in magnetospheric reconnections of the heavy central rotator. Already for this reason, black holes cannot serve as jet engines. During its passage from subsonic to supersonic propagation, still inside its deLaval nozzle, the escaping relativistic pair-plasma passes from a relativistic Maxwellian distribution (almost) to that of a (mono-energetic) Deltafunction, of (uniform) Lorentz-factor γ = 10 2±2. Clearly, this transition in velocity distribution-in transit through the deLaval nozzle-is not loss-free; it turns the jet engine into a powerful γ-ray emitter, with photon frequencies reaching up to 10 26 Hz, (corresponding to electron Lorentz factors γ 10 6), see page 120 of Kundt & Krishna [2004]. So far, all the jets were treated as though propagating in vacuum, as "bare jets". New in this presentation will be an allowance for an embedding medium of non-negligible density, most notably encountered in SS 433 (with its fast-moving X-ray and optical spectral lines), but likewise in our Galactic twin jet. Such an embedding medium, gas or plasma, will try to penetrate into the jet channels, but will instead be expelled, and dragged along by the streaming, extremely relativistic pair plasma, in the form of subrelativistically comoving channel-wall material. In this way, bare jets are converted into (line-and continuum-) emitting "dressed jets".

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Section: Pos(frapws2014)025mentioning

confidence: 99%

A Uniform Description of All the Astrophysical Jets

Kundt¹

2016

Proceedings of Frontier Research in Astrophysics — PoS(FRAPWS2014)

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“…2: Their masses would shrink with agenot grow with age, as BH masses must-when they discharge efficiently, via their strong winds. Such ideas found support by people like Peter Scheuer, John Biretta, Ski Antonucci, and others, and were published, among others, in 2002 [19], 2008a [22], b [23], and 2009 [25]. BH proponents are aware of the inconsistent (sign of) evolution documented in Fig.…”

Section: (2005)?mentioning

confidence: 87%

“…I argued that his (gigantic) expression measures the entropy liberated during the hole's evaporation, lasting 10 67 years for a solar mass, not during its formation, measuring in microseconds for the same mass (also: [25]). Jürgen had no objections to my letter when I told him about it, whereas my friendship with Stephen degraded.…”

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confidence: 99%

Jürgen Ehlers—and the fate of the black-hole spacetimes

Kundt

2009

Gen Relativ Gravit

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This article-written in honour of Jürgen Ehlers-consists of two different, though interlocking parts: Sect. 1 describes my 54 years of perpetual experiences and exchanges with him, both science and episodes, whilst Sect. 2 describes the history of astrophysical black holes, which evolved during the same epoque though largely independently, with its activity centers in other places of the globe, and has by no means terminated.Keywords Jürgen Ehlers · Black holes · Sgr A* Jürgen Ehlers: our 54 years of close interactionJürgen Ehlers and I both studied physics and mathematics at Hamburg University. My studies began with the summer 'Semester' of 1950, Jürgen's 1 year earlier; (he was born on 29 November 1929, 18 months before me). When we scientifically matured to terminate our standard education-in the fall of 1953, I think-we were both attracted by the personality of Pascual Jordan, and jointly started weekly seminar work with him. Soon we were joined by Engelbert Schücking, and soon again, Pascual Jordan guided our collaboration, both mentally, and financially. The Hamburg group in General Relativity had been founded.Jürgen, Engelbert, myself, and 'der Meister' took turns as weekly seminar speakers. Initially, Jordan's contributions aimed at improving the second edition of his book 'Schwerkraft und Weltall'. Jürgen's contributions educated us primarily on other people's work: they helped us understand it thoroughly. And Engelbert excited us with brand new stuff which had somehow entered his mind; unless he did not show up at W. Kundt (B)

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“…No pair formation, no buoyant escape, no LFWs. Fortunately, ever since 1978, I have convinced myself (and even a few of my referees) that the CEs of AGN are not SMBHs, rather (nuclear-) Burning Disks (BDs), which act analogously to heavy, magnetised rotators, via their strongly shearing inner-galactic diskal coronas [Kundt 1979[Kundt , 1990[Kundt , 1996[Kundt , 2001[Kundt , 2005[Kundt , 2009a2011a,b,c, Kundt & Krishna 1980, 2004. They share the magnetic reconnections, the buoyant escape, the postacceleration by their LFWs, and self-blown deLaval nozzles with the stellar CEs, thus creating quite similar-functioning twin jets.…”

Section: How To Make Jets?mentioning

confidence: 99%

The astrophysical jets (again): as the most complicated inorganic machines known to us

Kundt¹

2018

Proceedings of XII Multifrequency Behaviour of High Energy Cosmic Sources Workshop — PoS(MULTIF2017)

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In this talk (at Mondello), I attempt to sketch again my understanding of the universal working scheme of all the astrophysical jet sources, or 'bipolar flows', on both stellar and galactic scales, also called 'microquasars', and 'quasars'. A crucial building block will be their medium (whenever bare): extremely relativistic e ±-pair plasma performing quasi loss-free E x B-drifts through self-rammed channels, whose guiding equi-partition Eand B-fields convect the electric potential necessary for eventual single-step post-acceleration, at their 'knots' and terminating 'hotspots', or 'heads'. These electromagnetic fields convect half of the jet's power. The indispensible pair plasma is generated in magnetospheric reconnections of the heavy central rotator. For this reason alone, black holes cannot possibly serve as jet engines. During its passage from subsonic to supersonic propagation, still inside its deLaval nozzle, the escaping relativistic pair-plasma passes from a relativistic Maxwellian distribution (almost) to that of a (mono-energetic) Deltafunction, of (uniform) Lorentz-factor γ = 10 2±2. Clearly, this transition in velocity distribution-in transit through the deLaval nozzle-is not loss-free; it turns the jet engine into a transient powerful γ-ray emitter, with photon frequencies reaching up to 10 26 Hz, (corresponding to electron Lorentz factors γ 10 6), see page 120 of [Kundt & Krishna, 2004]. So far, until [Kundt, 2015], all the jets were treated as though propagating in vacuum, as "bare jets". New in 2015 was an allowance for an embedding medium of non-negligible density, most notably encountered in SS 433 (with its fast-moving X-ray and optical spectral lines), but likewise in our Galactic twin jet. Such an embedding medium, gas or plasma, will try to penetrate into the jet channels, but will instead be ionised, expelled, and dragged along by the streaming, extremely relativistic pair plasma, in the form of subrelativistically comoving channel-wall material. In this way, bare jets are converted into (line-and continuum-) emitting "dressed jets ". Unfortunately, in 2015, I had been a bit rush: The generalisation from 'bare' to 'dressed' is not exactly straightforward, and should respect stability constraints, in order to (again) be unique; which I hope to present below, in this my second approach.

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Critical Thoughts on Cosmology

Cited by 5 publications

References 31 publications

A Uniform Description of All the Astrophysical Jets

A Uniform Description of All the Astrophysical Jets

Jürgen Ehlers—and the fate of the black-hole spacetimes

The astrophysical jets (again): as the most complicated inorganic machines known to us

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