Description
Scope: Discuss the prospects of new physics under the assumption that the H0 tension is robust within LCDM )
Questions:
What are currently the most promising/natural/interesting solutions to the H0 tension?
How can one best observationally test if it is new recombination physics (modification of recombination history) or if it is new pre-recombination physics (e.g. energy injection)?
Are there other promising early-time approaches that do not rely on shortening the sound horizon?
What is the role of late-time new physics in resolving the Hubble tension?
Could the solution reside in the visible sector alone?
How can we use LSS/LyAlpha observations to learn about new physics related to the H0 tension?
What are the other important probes of new physics related to the H0 tension?
Which complementary signatures do models addressing the H0 tension predict? (e.g. stochastic grav. waves, DM-DR interaction, Lyman-alpha, galaxy clustering) Can we use them to discriminate and maybe identify or rule out certain scenarios?
How do the questions about DM relate to the H0 tension (interactions, small scales, production, etc..)?
How do the questions about DE relate to the H0 tension (e.g. quintessence or CC)?
What other types of new physics discussed in cosmology could relate to the Hubble tension (e.g. ALPs, phase transitions, modified gravity)?
