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    A GR vs. alternative theories of gravity

    As per the summary I would like to find a review paper, monograph or book. Google is not find any recent reviews. Post 2018 would be ideal. Thanks for any pointers. Regards Andrew
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    I Formation of dark matter structures

    I can't understand how dark matter can form structures from the initial near uniform distribution as shown in simulation like those of the Eagle project I understand how the initial density fluctuation are amplified and dark (and ordinary) matter start to...
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    I Arrow of time and its reversal on a IBM quantum computer

    I would like to know what the implications of this paper are They say " Here we show that, while in nature the complex conjugation needed for time reversal is exponentially improbable, one can design a quantum algorithm that includes complex conjugation and...
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    A Quantum Gravity Research Group -- any standing in mainstream Physics?

    I would like to know if this group and its Emergence Theory has any standing in main stream Physics. Thanks Andrew
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    I Singular universal speed C

    I recall reading on this forum that a theorem had been proved to the effect that is there was a effective speed limit c in SR then there would only be one such limit for all relevant phenomena. Is this true and if so can you point me at it as I don't seem to be able to formulate the question...
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    I BH Information paradox and the LIGO BH merger

    Has anyone analysed the LIGO merger detection in the context of the BH information paradox? Is there any evidence that the gravitational waves carried any information that could compensate for the change in areas of the initial...
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    I Trouble with exact sequence

    I am trying to up my understanding on Manifolds, Tensors and Forms by reading a book of that title by Paul Renteln. I have got stuck fairly early on by his use of "exact sequences". Can some one give me a concrete example of a shot exact sequence of the form 0 -> U->V->W->0 where U,V,W are...
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    I Time in Space-time

    I am interested in the current understanding of time in SR GR QM and Cosmology and so apologies if this is the wrong place to post. I am currently reading "The End of Time" by Julian Barbour and am aware of "From Eternity to Here" by S Carroll and " The Singular Universe and the Reality of...
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    I The Higgs and virtual particles

    I have been reading the Quantum Diaries here and in discussing the Higgs and the LHC experiment he says "The general problem is this: at the LHC, we’re smashing protons into one another. The protons are each...
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    I Exact meaning of the Uncertainty Relations

    In another thread I quoted a paper Bill pointed me to. It included the statement "It is the measurement results that fluctuate, not the underlying object." Bill indicated that this was a misconception but would need a new thread to discuss it. So please discuss... Thanks Andrew
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    I QFT clarification please

    I have been trying to improve my understanding of QFT via reading this forum, Zee's QFT in a Nutshell and Lancaster and Blundell's QFT for the Gifted Amateur. I thought I was making some progress but recent post have left me confused so any pointers would be welcome. As I currently understand...
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    I Gravitational wave time variation

    I have tried to discover if the local time as well as the local space is varied by the passage of a gravitational wave. I have seen animations and discussion of the effects of gravitational wave on space and test particles but can't find a reference to the changes in the time component of...