Dark Flow

The video explores cosmic motion, focusing on the concept of dark flow, where galaxy clusters may be moving towards a point beyond the cosmic horizon. It discusses Galilean relativity and the cosmic microwave background (CMB), explaining how peculiar velocities are measured. The Sunyaev-Zel'dovich effects are detailed, showing how they help identify galaxy clusters. The controversy surrounding dark flow is addressed, with differing results from WMAP and Planck satellite data. Finally, Feynman diagrams and quantum interactions are discussed, highlighting their role in understanding particle physics.

What is the Hubble flow?

• The motion of galaxies towards a single point

• The expansion of the universe causing galaxies to move apart

• The gravitational pull of the Great Attractor

• The rotation of galaxies within clusters

What does the cosmic microwave background (CMB) represent?

• The motion of galaxies within clusters

• The leftover heat from the early universe

• The current temperature of the universe

• The gravitational pull of dark matter

How does the kinematic Sunyaev-Zel'dovich effect differ from the thermal effect?

• It measures the temperature of galaxy clusters

• It adds an extra Doppler shift to CMB photons

• It detects the presence of dark matter

• It measures the expansion rate of the universe

What is the main controversy surrounding the dark flow?

• Its direction towards the Great Attractor

• Its existence and the evidence supporting it

• Its impact on the cosmic microwave background

• Its effect on the expansion of the universe

What is the Great Attractor?

• A massive galaxy cluster causing dark flow

• A point beyond the cosmic horizon

• A region of space with a strong gravitational pull

• The center of the observable universe

What is the implication of a real dark flow?

• It indicates a static universe

• It suggests a neighboring region beyond the observable universe

• It confirms the existence of the Great Attractor

• It disproves the theory of cosmic inflation

What is the role of Feynman diagrams in quantum electrodynamics?

• To represent gravitational interactions

• To illustrate particle interactions

• To measure cosmic expansion

• To detect dark matter

What must be conserved in Feynman diagrams?

• Charge and spin

• Energy and momentum

• Mass and volume

• Temperature and pressure

What happens when an electron and positron annihilate?

• They produce two photons

• They produce a neutron

• They produce one photon

• They produce a proton

What is the significance of entanglement in Feynman diagrams?

• It illustrates the influence of one particle on another

• It detects the presence of dark matter

• It measures the speed of light

• It shows the conservation of energy