In-depth, calmly narrated documentaries exploring cosmology, quantum theory and the philosophy of science — the companion library to the Sleepy Joe Space YouTube channel.https://sleepyjoespace.com/en-ushttps://sleepyjoespace.com/article/spacetime-foliation/https://sleepyjoespace.com/article/spacetime-foliation/Spacetime foliation is the mathematical operation that slices a four-dimensional universe into three-dimensional sheets of 'now.' In general relativity, the slicing is a gauge choice. This is the physics, the ADM formalism, and why no universal present exists.Mon, 08 Jun 2026 00:00:00 GMTspacetime foliationADM formalismCauchy surfacelapse and shiftis there a universal nowblock universegeneral relativity 3+1 decompositionhttps://sleepyjoespace.com/article/platonia-julian-barbour/https://sleepyjoespace.com/article/platonia-julian-barbour/Julian Barbour's Platonia replaces time with a static landscape of every possible 'Now.' This is the physics, the equations, and the deep questions it cannot answer.Sun, 07 Jun 2026 00:00:00 GMTJulian Barbour Platoniatimeless universe theoryWheeler-DeWitt equationblock universe vs Platoniatime capsules physicsdoes time exist physicshttps://sleepyjoespace.com/article/white-holes/https://sleepyjoespace.com/article/white-holes/White holes are the time-reverse of black holes, a region nothing can enter and everything escapes. Long dismissed as mathematical curiosities, they may now be the physical exit from every black hole that ever formed.Sat, 06 Jun 2026 00:00:00 GMTwhite holesPlanck starblack hole white hole transitionwhite hole remnantloop quantum gravity bounceblack hole information paradoxHaggard-Rovelli fireworkshttps://sleepyjoespace.com/article/tipler-cylinder/https://sleepyjoespace.com/article/tipler-cylinder/In 1974, Frank Tipler showed that an infinite, ultra-dense, fast-spinning cylinder would drag spacetime hard enough to permit time travel into the past. This is the physics, the specifications, and the universe's response.Thu, 04 Jun 2026 00:00:00 GMTTipler cylinderTipler time machinerotating cylinder time travelframe draggingclosed timelike curvesvan Stockum dustchronology protection conjecturehttps://sleepyjoespace.com/article/closed-timelike-curves/https://sleepyjoespace.com/article/closed-timelike-curves/In 1991, David Deutsch wrote down the mathematics of what quantum mechanics does when a particle is forced to loop back through its own past. The paradox dissolves. The price is your continuous identity.Wed, 03 Jun 2026 00:00:00 GMTclosed timelike curvesDeutsch CTC modelgrandfather paradox quantum mechanicschronology protection conjectureNovikov self-consistency principleD-CTC vs P-CTCquantum time travelhttps://sleepyjoespace.com/article/spin-networks/https://sleepyjoespace.com/article/spin-networks/Spin networks are the central objects of loop quantum gravity, the theory that space itself is built from discrete quanta of geometry. This is the physics, what it actually says, and what it doesn't.Mon, 01 Jun 2026 00:00:00 GMTspin networksloop quantum gravityis space discreteatoms of spacePlanck lengthloop quantum cosmologyWheeler-DeWitt equationhttps://sleepyjoespace.com/article/absolute-elsewhere/https://sleepyjoespace.com/article/absolute-elsewhere/The absolute elsewhere is the third region of spacetime, sealed away from cause and effect, where the word 'now' loses all meaning. This is the physics, the Andromeda paradox, and the question the picture cannot answer.Sun, 31 May 2026 00:00:00 GMTabsolute elsewherelight cone three regionsspacelike separationabsolute elsewhere physicsspeed of causalityAndromeda paradoxlight cone elsewherehttps://sleepyjoespace.com/article/temporal-parts/https://sleepyjoespace.com/article/temporal-parts/If the block universe is real, you may not be a single self moving through time but a four-dimensional worm of temporal parts. This is the physics, the philosophy, and the question the picture cannot answer.Sat, 30 May 2026 00:00:00 GMTtemporal partsperdurantismendurantism vs perdurantismworm theory philosophyfour-dimensionalismpersonal identity over timeare we temporal partshttps://sleepyjoespace.com/article/growing-block-universe/https://sleepyjoespace.com/article/growing-block-universe/The Growing Block universe says the past and present are real, but the future is literally not yet there. This is the physics, the philosophy, and the unresolved question both sides share.Wed, 27 May 2026 00:00:00 GMTgrowing block universegrowing block theorydoes the future already existC.D. Broad growing blockgrowing block vs block universeepistemic objection timeis the future realhttps://sleepyjoespace.com/article/block-universe/https://sleepyjoespace.com/article/block-universe/The block universe theory holds that past, present, and future are equally real, frozen together in a four-dimensional spacetime. This is the physics, the argument, and the unsettling implication.Tue, 30 Dec 2025 00:00:00 GMTblock universe theorydoes the future already existeternalism physicsrelativity of simultaneityRietdijk-Putnam argumentAndromeda Paradoxfour dimensional spacetime