blog: cosmology question of the week

462. CQW holiday project: weak field gravity
Wednesday, July 27, 2022 at 12:00 AM CEST

461. mapping shear flow
Wednesday, July 20, 2022 at 12:00 AM CEST

460. screening classical gravity
Wednesday, July 13, 2022 at 12:00 AM CEST

459. inertia of the Friedmann-equations
Wednesday, July 6, 2022 at 12:00 AM CEST

458. back to the basics 2
Wednesday, June 29, 2022 at 12:00 AM CEST

457. back to the basics
Wednesday, June 22, 2022 at 12:00 AM CEST

456. relativistic aging
Wednesday, June 15, 2022 at 12:00 AM CEST

455. Ehrenfest-symmetries
Wednesday, June 8, 2022 at 12:00 AM CEST

454. time-reversibility of quantum mechanics
Wednesday, June 1, 2022 at 12:00 AM CEST

453. Weyl-scaling
Wednesday, May 25, 2022 at 12:00 AM CEST

452. specific thermal power
Wednesday, May 18, 2022 at 12:00 AM CEST

451. Carnot-engine in cosmology
Wednesday, May 11, 2022 at 12:00 AM CEST

450. buoyancy and relativity
Wednesday, May 4, 2022 at 12:00 AM CEST

449. queezy relativistic feeling
Wednesday, April 27, 2022 at 12:00 AM CEST

448. Bohr's atomic model
Wednesday, April 20, 2022 at 12:00 AM CEST

447. ocean waves and gravity
Wednesday, April 13, 2022 at 12:00 AM CEST

446. Drake-equation
Wednesday, April 6, 2022 at 12:00 AM CEST

445. gravity and thermodynamics
Wednesday, March 30, 2022 at 12:00 AM CEST

444. Maxwell geodesics
Wednesday, March 23, 2022 at 12:00 AM CET

443. weak lensing of gravitational waves
Wednesday, March 16, 2022 at 12:00 AM CET

442. constants of Nature combined
Wednesday, March 9, 2022 at 12:00 AM CET

441. negative Hubble-constant
Wednesday, March 2, 2022 at 12:00 AM CET

440. electrodynamics in fewer dimensions
Wednesday, February 23, 2022 at 12:00 AM CET

439. Lovelock for electrodynamics?
Wednesday, February 16, 2022 at 12:00 AM CET

438. Galilei tries out geodesic deviation
Wednesday, February 9, 2022 at 12:00 AM CET

437. Newtonian geodesic deviation
Wednesday, February 2, 2022 at 12:00 AM CET

436. candle in a gravitational field
Wednesday, January 26, 2022 at 12:00 AM CET

435. rocket launch
Wednesday, January 19, 2022 at 12:00 AM CET

434. Lorentz-covariance of the large-scale structure
Wednesday, January 12, 2022 at 12:00 AM CET

433. multivariate Cauchy-distribution
Wednesday, December 22, 2021 at 12:00 AM CET

432. alternative Maxwell-density
Wednesday, December 15, 2021 at 12:00 AM CET

431. Einstein, Hilbert, Newton and Lagrange
Wednesday, December 8, 2021 at 12:00 AM CET

430. many famous names....
Wednesday, December 1, 2021 at 12:00 AM CET

429. retardation in electrodynamics
Wednesday, November 24, 2021 at 12:00 AM CET

428. determinant of the Schwarzschild metric
Wednesday, November 17, 2021 at 12:00 AM CET

427. electrical engineering in Lorentz-frames
Wednesday, November 10, 2021 at 12:00 AM CET

426. gauging in classical theories
Wednesday, November 3, 2021 at 12:00 AM CET

425. gauge transformations and gravity
Wednesday, October 27, 2021 at 12:00 AM CEST

424. measuring temperature
Wednesday, October 20, 2021 at 12:00 AM CEST

423. propagation of classical fields
Wednesday, October 13, 2021 at 12:00 AM CEST

422. locality and linearity
Wednesday, October 6, 2021 at 12:00 AM CEST

421. CQW holiday project: visible CMB
Wednesday, July 28, 2021 at 12:00 AM CEST

420. massive inflation
Wednesday, July 21, 2021 at 12:00 AM CEST

419. Hamilton-density as a gravitational source
Wednesday, July 14, 2021 at 12:00 AM CEST

418. accelerated cuckoo clock
Wednesday, July 7, 2021 at 12:00 AM CEST

417. CMB sail
Wednesday, June 30, 2021 at 12:00 AM CEST

416. waves in scalar- and vector-fields
Wednesday, June 23, 2021 at 12:00 AM CEST

415. oceans in relativity
Wednesday, June 16, 2021 at 12:00 AM CEST

414. tides and waves
Wednesday, June 9, 2021 at 12:00 AM CEST

413. cosmological constant
Wednesday, June 2, 2021 at 12:00 AM CEST

412. photon domination
Wednesday, May 26, 2021 at 12:00 AM CEST

411. cosmological melody
Wednesday, May 19, 2021 at 12:00 AM CEST

410. Mr. Turtur and cosmology
Wednesday, May 12, 2021 at 12:00 AM CEST

409. voyage to the centre of the Earth
Wednesday, May 5, 2021 at 12:00 AM CEST

408. horizon dynamics
Wednesday, April 28, 2021 at 12:00 AM CEST

407. gauging in classical gravity
Wednesday, April 21, 2021 at 12:00 AM CEST

406. relativistic and classical fluids
Wednesday, April 14, 2021 at 12:00 AM CEST

405. extended electrodynamics
Wednesday, April 7, 2021 at 12:00 AM CEST

404. NASER
Wednesday, March 31, 2021 at 12:00 AM CEST

403. alternative Bianchi-identity
Wednesday, March 24, 2021 at 12:00 AM CET

402. Maxwell's equations as 2nd order DEQ
Wednesday, March 17, 2021 at 12:00 AM CET

401. Weyl-curvature in cosmology
Wednesday, March 10, 2021 at 12:00 AM CET

400. cosmological constant
Wednesday, March 3, 2021 at 12:00 AM CET

399. coupling to matter
Wednesday, February 24, 2021 at 12:00 AM CET

398. antisymmetric tensors
Wednesday, February 17, 2021 at 12:00 AM CET

397. shortcut to black holes
Wednesday, February 10, 2021 at 12:00 AM CET

396. Ricci-tensor for classical gravity
Wednesday, February 3, 2021 at 12:00 AM CET

395. Weyl-tensor for classical gravity
Wednesday, January 27, 2021 at 12:00 AM CET

394. Weyl-tensor in GR
Wednesday, January 20, 2021 at 12:00 AM CET

393. gauging gravity
Wednesday, January 13, 2021 at 12:00 AM CET

392. curvature in FLRW
Wednesday, January 6, 2021 at 3:56 PM CET

391. symmetry and conservation
Wednesday, December 23, 2020 at 12:00 AM CET

390. Bianchi-identity and null-geodesics
Wednesday, December 16, 2020 at 12:00 AM CET

389. dispersion of gravitational waves
Wednesday, December 9, 2020 at 12:00 AM CET

388. vacuum solutions
Wednesday, December 2, 2020 at 12:00 AM CET

387. Weyl-tensor
Wednesday, November 25, 2020 at 12:00 AM CET

386. inertial motion in cosmology
Wednesday, November 18, 2020 at 12:00 AM CET

385. parallel transport
Wednesday, November 11, 2020 at 12:00 AM CET

384. multivariate distribution with units
Wednesday, November 4, 2020 at 12:00 AM CET

383. Hubble drag
Wednesday, October 28, 2020 at 12:00 AM CET

382. moving black hole
Wednesday, October 21, 2020 at 12:00 AM CEST

381. gravitational waves and their properties
Wednesday, October 14, 2020 at 12:00 AM CEST

380. dispersion-free propagation
Wednesday, October 7, 2020 at 12:00 AM CEST

379. CQW holiday project: Reissner-Nordstroem cosmology
Wednesday, July 29, 2020 at 12:00 AM CEST

378. colours of the rainbow
Wednesday, July 22, 2020 at 12:00 AM CEST

377. electromagnetic deviation
Wednesday, July 15, 2020 at 12:00 AM CEST

376. gravitational wave distortions
Wednesday, July 8, 2020 at 12:00 AM CEST

375. integral form of GR
Wednesday, July 1, 2020 at 12:00 AM CEST

374. scales in cosmology
Wednesday, June 24, 2020 at 12:00 AM CEST

373. partial and covariant derivatives
Wednesday, June 17, 2020 at 12:00 AM CEST

372. entropy conservation
Wednesday, June 10, 2020 at 12:00 AM CEST

371. nonrelativistic motion with gravity
Wednesday, June 3, 2020 at 12:00 AM CEST

370. relativistic and nonrelativistic motion
Wednesday, May 27, 2020 at 12:00 AM CEST

369. completeness of Newton's axioms
Wednesday, May 20, 2020 at 12:00 AM CEST

368. Newton's axioms from a relativistic point of view
Wednesday, May 13, 2020 at 12:00 AM CEST

367. fields at infinity
Wednesday, May 6, 2020 at 12:00 AM CEST

366. Reissner-Nordstroem gravitational wave
Wednesday, April 29, 2020 at 12:00 AM CEST

365. shearing of globular clusters
Wednesday, April 22, 2020 at 12:00 AM CEST

364. Kruskal-coordinates for RN-holes
Wednesday, April 15, 2020 at 12:00 AM CEST

363. relativistic motion
Wednesday, April 8, 2020 at 12:00 AM CEST

362. source of gravity
Wednesday, April 1, 2020 at 12:00 AM CEST

361. equations of motion in relativity
Wednesday, March 25, 2020 at 12:00 AM CET

360. geodesic deviation
Wednesday, March 18, 2020 at 12:00 AM CET

359. GR field equation in an unusual form
Wednesday, March 11, 2020 at 12:00 AM CET

358. lensing of the CMB
Wednesday, March 4, 2020 at 12:00 AM CET

357. decaying mode
Wednesday, February 26, 2020 at 12:00 AM CET

356. time-dependent couplings
Wednesday, February 19, 2020 at 12:00 AM CET

355. uniqueness of Planck-spectra
Wednesday, February 12, 2020 at 12:00 AM CET

354. CMB in the past and future
Wednesday, February 5, 2020 at 12:00 AM CET

353. weak lensing light cone
Wednesday, January 29, 2020 at 12:00 AM CET

352. PT-invariance
Wednesday, January 22, 2020 at 12:00 AM CET

351. acceleration in Newton-cosmology
Wednesday, January 15, 2020 at 12:00 AM CET

350. finite variance
Wednesday, January 8, 2020 at 12:00 AM CET

349. action for FLRW
Wednesday, January 1, 2020 at 12:00 AM CET

348. lost in space, again
Wednesday, December 18, 2019 at 12:00 AM CET

347. lost in space, part 2
Wednesday, December 11, 2019 at 8:23 PM CET

346. lost in space
Wednesday, December 4, 2019 at 12:00 AM CET

345. conformal transformation of weak fields
Wednesday, November 27, 2019 at 12:00 AM CET

344. cooling of an ideal gas
Wednesday, November 20, 2019 at 12:00 AM CET

343. exploding void
Wednesday, November 13, 2019 at 12:00 AM CET

342. massless bosons
Wednesday, November 6, 2019 at 12:00 AM CET

341. winter's coming
Wednesday, October 30, 2019 at 12:00 AM CET

340. inside a proton
Wednesday, October 23, 2019 at 12:00 AM CEST

339. alternative Wien-laws
Wednesday, October 16, 2019 at 12:00 AM CEST

338. equivalent twin paradoxon
Wednesday, October 9, 2019 at 12:00 AM CEST

337. relativistic Carnot engine
Wednesday, October 2, 2019 at 12:00 AM CEST

336. CQW holiday project: temperature measurement
Wednesday, July 31, 2019 at 12:00 AM CEST

335. adiabatic equation
Wednesday, July 24, 2019 at 12:00 AM CEST

334. Newtonian cosmology
Wednesday, July 17, 2019 at 12:00 AM CEST

333. Newtonian gravity in n dimensions
Wednesday, July 10, 2019 at 12:00 AM CEST

332. Yukawa-potential
Wednesday, July 3, 2019 at 12:00 AM CEST

331. hourglass in a gravitational field
Wednesday, June 26, 2019 at 12:00 AM CEST

330. coupling, gauges and external fields
Wednesday, June 19, 2019 at 12:00 AM CEST

329. gravitational waves
Wednesday, June 12, 2019 at 12:00 AM CEST

328. Roche limit for an elastic body
Wednesday, June 5, 2019 at 12:00 AM CEST

327. energy from Lagrange, and vice versa
Wednesday, May 29, 2019 at 12:00 AM CEST

326. classical gravity, but now with Lambda
Wednesday, May 22, 2019 at 12:00 AM CEST

325. classical gravity
Wednesday, May 15, 2019 at 12:00 AM CEST

324. more tensor contractions
Wednesday, May 8, 2019 at 12:00 AM CEST

323. tensor contraction
Wednesday, May 1, 2019 at 12:00 AM CEST

322. sense and sensibility
Wednesday, April 24, 2019 at 12:00 AM CEST

321. fermionic wave function
Wednesday, April 17, 2019 at 12:00 AM CEST

320. three great solutions to GR
Wednesday, April 10, 2019 at 12:00 AM CEST

319. Newtonian geodesic deviation
Wednesday, April 3, 2019 at 12:00 AM CEST

318. Poisson's equation with and without cosmological constant
Wednesday, March 27, 2019 at 12:00 AM CET

317. Newton's cosmological constant
Wednesday, March 20, 2019 at 12:00 AM CET

316. Kolmogorov and Smirnov
Wednesday, March 13, 2019 at 12:00 AM CET

315. accelerated charge
Wednesday, March 6, 2019 at 12:00 AM CET

314. listen very carefully
Wednesday, February 27, 2019 at 12:00 AM CET

313. slow-roll at nth order
Tuesday, February 19, 2019 at 11:00 PM CET

312. symmetric field tensor
Wednesday, February 13, 2019 at 12:00 AM CET

311. scattering gravitational waves
Wednesday, February 6, 2019 at 12:00 AM CET

310. orbit variations for LISA
Wednesday, January 30, 2019 at 12:00 AM CET

309. Planck units without Planck's constant
Wednesday, January 23, 2019 at 12:00 AM CET

308. digravic material
Wednesday, January 16, 2019 at 12:00 AM CET

307. Lagrange's error
Wednesday, January 9, 2019 at 12:00 AM CET

306. point masses and point charges
Tuesday, December 18, 2018 at 12:00 AM CET

305. Feynman's curtain rings
Tuesday, December 11, 2018 at 12:00 AM CET

304. Einstein and Rayleigh
Tuesday, December 4, 2018 at 12:00 AM CET

303. primordial gravity waves
Tuesday, November 27, 2018 at 12:00 AM CET

302. wave coincidence
Tuesday, November 20, 2018 at 12:00 AM CET

301. symmetry in relativity
Tuesday, November 13, 2018 at 12:00 AM CET

300. transversality of waves
Wednesday, November 7, 2018 at 12:00 AM CET

299. obtuse light cones
Wednesday, October 31, 2018 at 12:00 AM CET

298. description of light rays
Wednesday, October 24, 2018 at 12:00 AM CEST

297. scalar electrodynamics
Wednesday, October 17, 2018 at 10:18 AM CEST

296. boosting potentials and fields
Wednesday, October 10, 2018 at 12:00 AM CEST

295. Kirchhoff-rules and field theory
Wednesday, October 3, 2018 at 12:00 AM CEST

294. CQW holiday project: CMB in a lab
Wednesday, July 25, 2018 at 12:00 AM CEST

293. sound of silence
Wednesday, July 18, 2018 at 12:00 AM CEST

292. Lagrange's radio, part 2
Wednesday, July 11, 2018 at 12:00 AM CEST

291. Lagrange's radio
Wednesday, July 4, 2018 at 12:00 AM CEST

290. gravitational waves and Hubble expansion
Wednesday, June 27, 2018 at 12:00 AM CEST

289. relativity shootout
Wednesday, June 20, 2018 at 12:00 AM CEST

288. black hole merger
Wednesday, June 13, 2018 at 12:00 AM CEST

287. zeppelins and space ships
Wednesday, June 6, 2018 at 12:00 AM CEST

286. CMB gravitational shear
Wednesday, May 30, 2018 at 12:00 AM CEST

285. Hubble molecules
Wednesday, May 23, 2018 at 12:00 AM CEST

284. equivalence reloaded
Wednesday, May 16, 2018 at 12:00 AM CEST

283. conservation in gravity
Wednesday, May 9, 2018 at 12:00 AM CEST

282. deadly magnetars
Wednesday, May 2, 2018 at 12:00 AM CEST

281. pulsar magnetic fields
Wednesday, April 25, 2018 at 12:00 AM CEST

280. gravity of a magnetar
Wednesday, April 25, 2018 at 12:00 AM CEST

279. Hooke's universe
Wednesday, April 18, 2018 at 12:00 AM CEST

278. anisotropic equilibrium
Wednesday, April 11, 2018 at 12:00 AM CEST

277. Higgs and hydrogen
Wednesday, April 4, 2018 at 12:00 AM CEST

276. deflection of waves
Wednesday, March 28, 2018 at 12:00 AM CEST

275. Lissajous galaxy
Wednesday, March 21, 2018 at 12:00 AM CET

274. mildly relativistic particles
Wednesday, March 14, 2018 at 12:00 AM CET

273. cooling of atoms
Wednesday, March 7, 2018 at 12:00 AM CET

272. Eddington gravity
Wednesday, February 28, 2018 at 12:00 AM CET

271. electricity and magnetism
Wednesday, February 21, 2018 at 12:00 AM CET

270. FLRW curvature
Wednesday, February 14, 2018 at 12:00 AM CET

269. relative relativity
Wednesday, February 7, 2018 at 12:00 AM CET

268. celestial harmonics
Wednesday, January 31, 2018 at 12:00 AM CET

267. gravity from the Maxwell-field
Wednesday, January 24, 2018 at 12:00 AM CET

266. light and gravity
Wednesday, January 17, 2018 at 12:00 AM CET

265. charge and mass
Wednesday, January 10, 2018 at 12:00 AM CET

264. Maxwell invariants
Wednesday, December 20, 2017 at 12:00 AM CET

263. Einstein invariants
Wednesday, December 13, 2017 at 12:00 AM CET

262. Newton invariants
Wednesday, December 6, 2017 at 12:00 AM CET

261. pericentre shift and perturbation
Wednesday, November 29, 2017 at 12:00 AM CET

260. Maxwell-gravity
Wednesday, November 22, 2017 at 12:00 AM CET

259. wiggles in the metric
Wednesday, November 15, 2017 at 12:00 AM CET

258. gravitational wave receivers
Wednesday, November 8, 2017 at 12:00 AM CET

257. electromagnetic wave receivers
Wednesday, November 1, 2017 at 12:00 AM CET

256. naive relativity
Wednesday, October 25, 2017 at 12:00 AM CEST

255. wave interferometers
Wednesday, October 18, 2017 at 12:00 AM CEST

254. black hole growth
Wednesday, October 11, 2017 at 12:00 AM CEST

253. locally flat metric in cosmology
Wednesday, October 4, 2017 at 12:00 AM CEST

252. CQW holiday project: ocean level around Greenland
Wednesday, July 26, 2017 at 12:00 AM CEST

251. horizons in relativity
Wednesday, July 19, 2017 at 12:00 AM CEST

250. tidal shear invariants
Wednesday, July 12, 2017 at 12:00 AM CEST

249. clocks in acceleration
Wednesday, July 5, 2017 at 12:00 AM CEST

248. 120 - gasp! gasp!
Wednesday, June 28, 2017 at 12:00 AM CEST

247. 120 - gasp!
Wednesday, June 21, 2017 at 12:00 AM CEST

246. magic of Pauli-matrices
Wednesday, June 14, 2017 at 12:00 AM CEST

245. Pauli and Euclid
Wednesday, June 7, 2017 at 12:00 AM CEST

244. Pauli and Lorentz
Wednesday, May 31, 2017 at 12:00 AM CEST

243. Pauli-decomposition
Wednesday, May 24, 2017 at 12:00 AM CEST

242. derivative of a constant
Wednesday, May 17, 2017 at 12:00 AM CEST

241. relativistic waves
Wednesday, May 10, 2017 at 12:00 AM CEST

240. Schwarzwald relativity
Wednesday, May 3, 2017 at 12:00 AM CEST

239. quantify curvature
Wednesday, April 26, 2017 at 12:00 AM CEST

238. duality and the propagation of waves
Sunday, April 23, 2017 at 10:41 AM CEST

237. dark energy in the lab
Wednesday, April 19, 2017 at 12:00 AM CEST

236. Rydberg satellites
Wednesday, April 12, 2017 at 12:00 AM CEST

235. entropy density
Wednesday, April 5, 2017 at 12:00 AM CEST

234. measurement of the Planck-constant
Wednesday, March 29, 2017 at 12:00 AM CEST

233. 40, 20, 10
Wednesday, March 22, 2017 at 12:00 AM CET

232. intuition from the geodesic equation
Wednesday, March 15, 2017 at 12:00 AM CET

231. Lorentz force and acceleration
Wednesday, March 8, 2017 at 12:00 AM CET

230. Christoffel-symbols and geodesic motion
Wednesday, March 1, 2017 at 12:00 AM CET

229. charge asymmetry, part 2
Wednesday, February 22, 2017 at 12:00 AM CET

228. gravitational field of the hot sun
Wednesday, February 15, 2017 at 12:00 AM CET

227. spin-down of the Crab-pulsar
Wednesday, February 8, 2017 at 12:00 AM CET

226. electromagnetic duality
Wednesday, February 1, 2017 at 12:00 AM CET

225. gravity and retardation
Wednesday, January 25, 2017 at 12:00 AM CET

224. forces in relativity
Saturday, January 21, 2017 at 7:07 PM CET

223. very heavy and very light
Wednesday, January 18, 2017 at 12:00 AM CET

222. forces on dust particles
Wednesday, January 11, 2017 at 12:00 AM CET

221. funny way of writing Maxwell's equations
Wednesday, January 4, 2017 at 12:00 AM CET

220. comets and their tails
Wednesday, December 21, 2016 at 12:00 AM CET

219. Poynting-flux and magnetic charges
Wednesday, December 14, 2016 at 12:00 AM CET

218. electrodynamics with non-conserved charges
Wednesday, December 7, 2016 at 12:00 AM CET

217. gravitational fields for non-conservative systems
Wednesday, November 30, 2016 at 12:00 AM CET

216. dark star
Wednesday, November 23, 2016 at 12:00 AM CET

215. dissipation time scale
Wednesday, November 16, 2016 at 12:00 AM CET

214. motion or not?
Wednesday, November 9, 2016 at 12:00 AM CET

213. implications of a confirmed Lambda
Tuesday, November 8, 2016 at 4:12 PM CET

212. cosmology works?
Wednesday, November 2, 2016 at 12:00 AM CET

211. spherical gravitational wave
Wednesday, October 26, 2016 at 12:00 AM CEST

210. electricity and gravity
Wednesday, October 19, 2016 at 12:00 AM CEST

209. CPT and relativity
Wednesday, October 12, 2016 at 12:00 AM CEST

208. solutions to general relativity
Wednesday, October 5, 2016 at 12:00 AM CEST

207. CQW holiday project: Oort's cloud
Wednesday, July 27, 2016 at 12:00 AM CEST

206. gravity from a variational principle
Wednesday, July 20, 2016 at 12:00 AM CEST

205. parity of gravitational fields
Wednesday, July 13, 2016 at 12:00 AM CEST

204. time reversal in Einstein's field equation
Wednesday, July 6, 2016 at 12:00 AM CEST

203. time- and spacelike vectors
Wednesday, June 29, 2016 at 1:00 AM CEST

202. similarity in cosmology
Wednesday, June 22, 2016 at 12:00 AM CEST

201. similarity in modern physics
Wednesday, June 15, 2016 at 12:00 AM CEST

200. local field equations and nonlocal components
Wednesday, June 8, 2016 at 12:00 AM CEST

199. homogeneity of random fields
Wednesday, June 1, 2016 at 12:00 AM CEST

198. equivalence between gravity and inertia
Wednesday, May 25, 2016 at 12:00 AM CEST

197. interstellar (the movie)
Wednesday, May 18, 2016 at 12:00 AM CEST

196. underdetermined electrodynamics?
Wednesday, May 11, 2016 at 12:00 AM CEST

195. underdetermined general relativity?
Wednesday, May 4, 2016 at 12:00 AM CEST

194. divergence-free tensors
Wednesday, April 27, 2016 at 12:00 AM CEST

193. eternal sunshine
Wednesday, April 20, 2016 at 12:00 AM CEST

192. more power, R2!
Wednesday, April 13, 2016 at 12:00 AM CEST

191. moonwalk
Wednesday, April 6, 2016 at 12:00 AM CEST

190. Zeno and cosmology
Wednesday, March 30, 2016 at 12:00 AM CEST

189. equivalence
Wednesday, March 23, 2016 at 12:00 AM CET

188. pi in the sky
Wednesday, March 16, 2016 at 12:00 AM CET

187. scale of homogeneity
Wednesday, March 9, 2016 at 12:00 AM CET

186. non-ideal fluids
Wednesday, March 2, 2016 at 12:00 AM CET

185. speed of light and speed of gravity
Wednesday, February 24, 2016 at 12:00 AM CET

184. negative cosmological constant
Wednesday, February 17, 2016 at 12:00 AM CET

183. curved or straight?
Wednesday, February 10, 2016 at 12:00 AM CET

182. correlation function
Wednesday, February 3, 2016 at 12:00 AM CET

181. Lorentz boosted resistor
Wednesday, January 27, 2016 at 12:00 AM CET

180. Lorentz boosted capacitor
Wednesday, January 20, 2016 at 12:00 AM CET

179. Lorentz boosted coil
Wednesday, January 13, 2016 at 12:00 AM CET

178. redshift drift
Wednesday, January 6, 2016 at 12:00 AM CET

177. Hubble-collapse
Wednesday, December 23, 2015 at 12:00 AM CET

176. Schwarzschild radius of electrons
Wednesday, December 16, 2015 at 12:00 AM CET

175. replacing Maxwell's equations
Wednesday, December 9, 2015 at 12:00 AM CET

174. gravitational wave interferometers
Wednesday, December 2, 2015 at 11:41 PM CET

173. Hubble nucleus
Wednesday, November 25, 2015 at 12:00 AM CET

172. let it rip!
Wednesday, November 18, 2015 at 12:00 AM CET

171. no big bang
Wednesday, November 11, 2015 at 12:00 AM CET

170. vacuum fluctuations
Wednesday, November 4, 2015 at 12:00 AM CET

169. conditions for cosmic horizons
Wednesday, October 28, 2015 at 12:00 AM CET

168. falling faster
Wednesday, October 21, 2015 at 12:00 AM CEST

167. cosmologies without beginning
Wednesday, October 14, 2015 at 12:00 AM CEST

166. gravity (the movie)
Wednesday, October 7, 2015 at 12:00 AM CEST

165. CQW holiday project: gravitational field of a cube
Wednesday, July 29, 2015 at 12:00 AM CEST

164. temperature measurement
Wednesday, July 22, 2015 at 12:00 AM CEST

163. wrong sign in the induction equation
Wednesday, July 15, 2015 at 12:00 AM CEST

162. magnetic charges and energy conservation
Wednesday, July 8, 2015 at 12:00 AM CEST

161. too many Maxwell equations?
Wednesday, July 1, 2015 at 12:00 AM CEST

160. critical density in stationary universes
Wednesday, June 24, 2015 at 12:00 AM CEST

159. conservation laws in relativity
Wednesday, June 17, 2015 at 12:00 AM CEST

158. Lambda in 2 dimensions
Wednesday, June 10, 2015 at 12:00 AM CEST

157. cosmology and chemistry
Wednesday, June 3, 2015 at 12:00 AM CEST

156. balance dark matter and dark energy
Wednesday, May 27, 2015 at 12:00 AM CEST

155. thermal vs. kinetic SZ-effect
Wednesday, May 20, 2015 at 12:00 AM CEST

154. mechanical similarity and the moon landing
Wednesday, May 13, 2015 at 12:00 AM CEST

153. FLRW-fluids
Wednesday, May 6, 2015 at 12:00 AM CEST

152. neutrinos everywhere!
Wednesday, April 29, 2015 at 12:00 AM CEST

151. Lenz-Runge-Laplace vector
Wednesday, April 22, 2015 at 12:00 AM CEST

150. cosmic acceleration maxed out
Wednesday, April 15, 2015 at 12:00 AM CEST

149. boosted electric and magnetic fields
Wednesday, April 8, 2015 at 12:00 AM CEST

148. Darwin-term in the Kepler-problem
Wednesday, April 1, 2015 at 12:00 AM CEST

147. constant radius of the Hubble sphere
Wednesday, March 25, 2015 at 12:00 AM CET

146. charge asymmetry
Wednesday, March 18, 2015 at 12:00 AM CET

145. mass content of the Universe
Wednesday, March 11, 2015 at 12:00 AM CET

144. oscillations in the expansion history
Wednesday, March 4, 2015 at 12:00 AM CET

143. recollapsing FLRW-universes
Wednesday, February 25, 2015 at 12:00 AM CET

142. just two equations?
Wednesday, February 18, 2015 at 12:00 AM CET

141. FLRW-universes with no big bang
Wednesday, February 11, 2015 at 12:00 AM CET

140. ambiguity in the Planck-units?
Wednesday, February 4, 2015 at 12:00 AM CET

139. cosmology in SI-units
Wednesday, January 28, 2015 at 12:00 AM CET

138. Einstein's grandfather clock
Wednesday, January 21, 2015 at 12:00 AM CET

137. fine structure for Keplerium
Wednesday, January 14, 2015 at 12:00 AM CET

136. inertial forces and mechanical work
Wednesday, December 17, 2014 at 12:00 AM CET

135. Eddington-limit for muons
Wednesday, December 10, 2014 at 12:00 AM CET

134. cosmic neutrinos in ICECUBE
Wednesday, December 3, 2014 at 12:00 AM CET

133. tidal stretching of Palomar 5
Wednesday, November 26, 2014 at 12:00 AM CET

132. a quantum of sunshine
Wednesday, November 19, 2014 at 12:00 AM CET

131. tidal forces in the gravity train
Wednesday, November 12, 2014 at 12:00 AM CET

130. anti-Earth
Wednesday, November 5, 2014 at 12:00 AM CET

129. correlation coefficient
Wednesday, October 29, 2014 at 12:00 AM CET

128. Eddington temperature
Wednesday, October 22, 2014 at 12:00 AM CEST

127. Boltzmann-tail of the Planck-spectrum
Wednesday, October 15, 2014 at 12:00 AM CEST

126. natural value of the Hubble constant
Wednesday, October 8, 2014 at 12:00 AM CEST

125. Boltzmann-photons
Wednesday, October 1, 2014 at 12:00 AM CEST

124. CQW holiday project: NFW-wave function
Wednesday, July 30, 2014 at 12:00 AM CEST

123. Roche limit for a drop of water
Wednesday, July 23, 2014 at 12:00 AM CEST

122. periapsis recession
Wednesday, July 16, 2014 at 12:00 AM CEST

121. units of spectra
Wednesday, July 9, 2014 at 12:00 AM CEST

120. a much smaller Planck-mass
Wednesday, July 2, 2014 at 12:00 AM CEST

119. Newton's Indian rope trick
Wednesday, June 25, 2014 at 12:00 AM CEST

118. asymptotic Hubble-function
Wednesday, June 18, 2014 at 12:00 AM CEST

117. cosmic Unruh-effect
Wednesday, June 11, 2014 at 12:00 AM CEST

116. Dirac's large numbers
Wednesday, June 4, 2014 at 12:00 AM CEST

115. temperature in a FLRW-universe
Wednesday, May 28, 2014 at 12:00 AM CEST

114. Sunyaev-Zel'dovich effects with neutrinos
Wednesday, May 21, 2014 at 12:00 AM CEST

113. cluster cooling by immersion into the CMB
Wednesday, May 14, 2014 at 12:00 AM CEST

112. boundary to quantum cosmology
Wednesday, May 7, 2014 at 12:00 AM CEST

111. coasting dark energy universe
Wednesday, April 30, 2014 at 12:00 AM CEST

110. Ricci-scalar in a FLRW-universe
Wednesday, April 23, 2014 at 12:00 AM CEST

109. Wien displacements in many dimensions
Wednesday, April 16, 2014 at 12:00 AM CEST

108. braking by scattering
Wednesday, April 9, 2014 at 12:00 AM CEST

107. Planck, Bose and Boltzmann
Wednesday, April 2, 2014 at 12:00 AM CEST

106. fundamentals of cosmology
Wednesday, March 26, 2014 at 12:00 AM CET

105. fat Hubble sphere
Wednesday, March 19, 2014 at 12:00 AM CET

104. astronomy units in cosmology
Wednesday, March 12, 2014 at 12:00 AM CET

103. axioms of Lagrangian mechanics
Wednesday, March 5, 2014 at 12:00 AM CET

102. quantum statistics
Wednesday, February 26, 2014 at 12:00 AM CET

101. cosmic slow-motion
Wednesday, February 19, 2014 at 12:00 AM CET

100. Eddington's number
Wednesday, February 12, 2014 at 12:00 AM CET

99. gravitational Rydberg constant
Wednesday, February 5, 2014 at 12:00 AM CET

98. magic of the Gaussian distribution
Wednesday, January 29, 2014 at 12:00 AM CET

97. relativistic natural system of units
Wednesday, January 22, 2014 at 12:00 AM CET

96. subway to New Zealand
Wednesday, January 15, 2014 at 12:00 AM CET

95. nucleosynthesis with unstable nuclei
Wednesday, January 8, 2014 at 12:00 AM CET

94. island universe
Wednesday, December 18, 2013 at 12:00 AM CET

93. life in the early universe
Wednesday, December 11, 2013 at 12:00 AM CET

92. quantum microwave background
Wednesday, December 4, 2013 at 12:00 AM CET

91. classical photons
Wednesday, November 27, 2013 at 12:00 AM CET

90. radiation density
Wednesday, November 20, 2013 at 12:00 AM CET

89. slow acoustic waves
Wednesday, November 13, 2013 at 12:00 AM CET

88. natural scale of the Universe
Wednesday, November 6, 2013 at 12:00 AM CET

87. galaxy rotation curves at large radii
Wednesday, October 30, 2013 at 12:00 AM CET

86. cosmic neutrino background
Wednesday, October 23, 2013 at 12:00 AM CEST

85. shape of the Hubble-law
Wednesday, October 16, 2013 at 12:00 AM CEST

84. equation of state of baryons
Wednesday, October 9, 2013 at 12:00 AM CEST

83. thermal wavelength
Wednesday, October 2, 2013 at 12:00 AM CEST

82. Planck's summer: variations in \Lambda
Wednesday, August 7, 2013 at 12:00 AM CEST

81. Planck's summer: varying electron masses
Wednesday, July 31, 2013 at 12:00 AM CEST

80. Planck's summer: observation of the CNB
Wednesday, July 24, 2013 at 12:00 AM CEST

79. Planck's summer: gauge independence of cosmological surveys
Wednesday, July 17, 2013 at 12:00 AM CEST

78. Planck's summer: particle size matters!
Wednesday, July 10, 2013 at 12:00 AM CEST

77. Planck's summer: CMB observations without CMB photons
Wednesday, July 3, 2013 at 12:00 AM CEST

76. CMB as an ideal black body
Wednesday, June 26, 2013 at 12:00 AM CEST

75. CMB recombination
Wednesday, June 19, 2013 at 12:00 AM CEST

74. advection with the Hubble flow
Wednesday, June 12, 2013 at 12:00 AM CEST

73. supernovae at high redshift
Wednesday, June 5, 2013 at 12:00 AM CEST

72. dark energy takes over...
Wednesday, May 29, 2013 at 12:00 AM CEST

71. size of the Universe
Wednesday, May 22, 2013 at 12:00 AM CEST

70. tests for FLRW-cosmologies
Wednesday, May 15, 2013 at 12:00 AM CEST

69. energy input into the CMB
Wednesday, May 8, 2013 at 12:00 AM CEST

68. inflationary perturbations
Wednesday, May 1, 2013 at 12:00 AM CEST

67. invariants of the lensing Jacobian
Wednesday, April 24, 2013 at 12:00 AM CEST

66. Lambda as a source of energy
Wednesday, April 17, 2013 at 12:00 AM CEST

65. thermal equilibrium and the CMB
Wednesday, April 10, 2013 at 12:00 AM CEST

64. limitations of the NFW-profile shape
Wednesday, April 3, 2013 at 12:00 AM CEST

63. decaying vorticity
Wednesday, March 27, 2013 at 12:00 AM CET

62. Higgs mechanism
Wednesday, March 20, 2013 at 12:00 AM CET

61. electroweak phase transition
Wednesday, March 13, 2013 at 12:00 AM CET

60. thinking outside the box
Wednesday, March 6, 2013 at 12:00 AM CET

59. back to the future
Wednesday, February 27, 2013 at 12:00 AM CET

58. Hubble slow motion
Wednesday, February 20, 2013 at 12:00 AM CET

57. scale-invariance of perturbations
Wednesday, February 13, 2013 at 12:00 AM CET

56. cosmic conspiracy for rotation curves
Wednesday, February 6, 2013 at 12:00 AM CET

55. gravity in 2d and 3d
Wednesday, January 30, 2013 at 12:00 AM CET

54. homogeneous and anisotropic cosmology
Wednesday, January 23, 2013 at 12:00 AM CET

53. destruction of gravitationally bound systems
Wednesday, January 16, 2013 at 12:00 AM CET

52. conformal time in Lambda-driven expansion
Wednesday, January 9, 2013 at 12:00 AM CET

51. virial theorem in clusters
Wednesday, December 19, 2012 at 12:00 AM CET

50. peculiar motion and the CMB
Wednesday, December 12, 2012 at 12:00 AM CET

49. inflationary dynamics
Wednesday, December 5, 2012 at 12:00 AM CET

48. Hubble expansion and superluminality
Wednesday, November 28, 2012 at 12:00 AM CET

47. redundancy in the Friedmann equations
Wednesday, November 21, 2012 at 12:00 AM CET

46. mechanical similarity and planetary orbits
Wednesday, November 14, 2012 at 12:00 AM CET

45. cold core (aka cooling flow)
Wednesday, November 7, 2012 at 12:00 AM CET

44. gravitationally bound systems
Wednesday, October 31, 2012 at 12:00 AM CET

43. CMB and SNe
Wednesday, October 24, 2012 at 12:00 AM CEST

42. gravitational interaction of photons
Wednesday, October 17, 2012 at 12:00 AM CEST

41. dark energy equation of state
Wednesday, October 10, 2012 at 12:00 AM CEST

40. gravity and dimensionality
Wednesday, October 3, 2012 at 12:00 AM CEST

39. uncertainty and inflation
Wednesday, September 26, 2012 at 12:00 AM CEST

38. planetary atmospheres
Wednesday, September 19, 2012 at 12:00 AM CEST

37. Copernican principle
Wednesday, September 12, 2012 at 12:00 AM CEST

36. atmospheric pressure on Venus
Wednesday, September 5, 2012 at 12:00 AM CEST

35. Sunyaev-Zel'dovich effect
Wednesday, July 11, 2012 at 12:00 AM CEST

34. non-trivial topology of the Universe
Wednesday, July 4, 2012 at 12:00 AM CEST

33. baryonic acoustic oscillations
Wednesday, June 27, 2012 at 12:00 AM CEST

32. haloes of all sizes
Wednesday, June 20, 2012 at 12:00 AM CEST

31. static universe
Wednesday, June 13, 2012 at 12:00 AM CEST

30. gravitational lensing
Wednesday, June 6, 2012 at 12:00 AM CEST

29. black body in 4 dimensions
Wednesday, May 30, 2012 at 12:00 AM CEST

28. selection bias - cosmo CSI
Wednesday, May 23, 2012 at 12:00 AM CEST

27. time-variation of the CMB
Wednesday, May 16, 2012 at 12:00 AM CEST

26. CDM particle properties
Thursday, May 10, 2012 at 12:00 AM CEST

25. negative redshifts
Thursday, May 3, 2012 at 12:00 AM CEST

24. fine structure constant
Thursday, April 26, 2012 at 12:00 AM CEST

23. Olbers' paradoxon
Thursday, April 19, 2012 at 12:00 AM CEST

22. to infinity and beyond...
Thursday, April 12, 2012 at 12:24 AM CEST

21. CMB dipole - fact or fiction?
Wednesday, April 11, 2012 at 11:04 PM CEST

20. digits in physical constants
Thursday, April 5, 2012 at 1:00 AM CEST

19. CMB temperature
Thursday, March 29, 2012 at 1:00 AM CEST

18. age of the Universe
Thursday, March 22, 2012 at 1:00 AM CET

17. time-dependence of cosmological constants
Thursday, March 15, 2012 at 1:00 AM CET

16. Mercury's orbit
Wednesday, March 14, 2012 at 1:00 AM CET

15. precision cosmology
Wednesday, March 7, 2012 at 11:01 PM CET

14. lensing on an expanding metric
Thursday, March 1, 2012 at 12:14 AM CET

13. Minkowski metric
Saturday, February 25, 2012 at 1:21 PM CET

12. voids
Monday, February 20, 2012 at 8:07 PM CET

11. Schwarzschild radius
Friday, February 17, 2012 at 7:46 PM CET

10. distance measures
Friday, February 10, 2012 at 10:23 AM CET

9. Gaussianity
Friday, February 3, 2012 at 10:25 AM CET

8. redshift space
Friday, January 27, 2012 at 10:26 AM CET

7. SZ-effect
Friday, January 20, 2012 at 10:26 AM CET

6. dark energy
Friday, January 13, 2012 at 10:27 AM CET

5. Hubble function
Friday, January 6, 2012 at 10:27 AM CET

4. nucleosynthesis
Friday, December 30, 2011 at 10:28 AM CET

3. coldest place
Friday, December 23, 2011 at 10:29 AM CET

2. distances
Friday, December 16, 2011 at 10:29 AM CET

1. change of redshift
Friday, December 9, 2011 at 10:30 AM CET