Author Archives: crisisinphysics

Optics of the Event Horizon Telescope

Gravitational bending of light rays near objects of size approaching 2MG/c2 (gravitational radius or ‘event horizon’) is known to be severe.  Light rays circle indefinitely at 3MG/c2  as Charles Darwin (the grandson) described in 1958.  Gravitational lensing causes more distant … Continue reading

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Retrospect on Prof. Hawking’s Research Project

Physics World has compiled what they see as key articles of “the legendary cosmologist and mathematical physicist” Hawking laid out his research vision in his 1981 inaugural lecture, Is the End in Sight for Theoretical Physics?   There, Hawking thought that the … Continue reading

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Hawking no comparison with Einstein

Good for Roger Penrose in standing up to the Hawking-cult (represented by Lisa Randall), when he said Hawking’s achievements were “astounding” given his physical condition. so lightly debunking claims he was the greatest physicist of our time, comparable with Einstein. … Continue reading

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Tracks of micro-life on the hadean Earth

Mega-impacts of asteroids/comets were driving the terrestrial habitat in the hadean epoch >3.8 Gyr ago. Rather than sterilising the Earth, these impacts made it suitable for early primitive life, whether de-novo or seeded from space. 13-C depletion in graphitic carbon … Continue reading

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The Shell Collapsar established in GR

A consistent description is possible for gravitationally collapsed bodies in General Relativity, in which collapse stops before the object reaches its gravitational radius. Non-singular solutions exist with the density reaching a maximum close to the surface and then decreasing towards … Continue reading

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LIGO’s new Gravitational Pulse – puzzling for Black-Hole interpretations

The four instances of the inspiral-merger pattern of a gravitation pulse from coalescing binary objects are over-interpreted and raise statistical questions. The final ring-down is too weak to distinguish exotic ‘Black Hole’ mergers from neutron star mergers. Why no identifications of the expected closer smaller merging events? The extraordinary claim to ‘primordial’ Black Holes is based on uncertain indications of spins. Continue reading

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Fixing the Nobel prize for LIGO/gravitational-waves comes unstuck

They got the application in by the 31 January deadline, stimulated a lot of endorsements and swept up an array of other awards – Gruber Cosmology Prize, the Kavli Prize in Astrophysics, the Shaw Prize in Astronomy, Special Breakthrough Prize … Continue reading

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