A principle named for this adjective is rejected by David Wiltshire’s timescape theory, which may provide a heterodox solution to the Hubble tension. For 10 points each:
[10m] What adjective names the principle that the universe is isotropic and homogeneous? Einstein called a constant named for this adjective and symbolized with a capital lambda his “greatest blunder.”
ANSWER: cosmological [accept cosmological principle; accept cosmological constant]
[10h] Assuming the cosmological principle, the Einstein Field Equations yield this metric. The spatial components of this metric are multiplied by the square of the scale factor a.
ANSWER: Friedmann–Lemaître–Robertson–Walker metric [or FLRW or FRW metric; or Friedmann–Robertson–Walker metric; or Friedmann–Lemaître metric; or FL metric]
[10e] This field’s slight anisotropy was observed by the WMAP and Planck satellites. This “relic radiation” pervades the universe and provides evidence for the Big Bang.
ANSWER: Cosmic Microwave Background Radiation [or CMBR]
<Editors, Other Science>