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Are the branching ratios of the Higgs boson consistent with the standard model? Is there only one type of Higgs boson?

What causes the emission of short bursts of light from imploding bubbles in a liquid when excited by sound?

Fusion energy may potentially provide power from abundant resource (e.g. hydrogen) without the type of radioactive waste that fission energy currently produces. However, can ionized gases (plasma) be...

Is dark matter responsible for differences in observed and theoretical speed of stars revolving around the center of galaxies, or is it something else?

What is the exact mechanism by which an implosion of a dying star becomes an explosion?

What is the mass of neutrinos, whether they follow Dirac or Majorana statistics? Is mass hierarchy normal or inverted? Is the CP violating phase 0?

Why are there three generations of quarks and leptons? Is there a theory that can explain the masses of particular quarks and leptons in particular generations from first principles (a theory of...

Does nature have more than four spacetime dimensions? If so, what is their size? Are dimensions a fundamental property of the universe or an emergent result of other physical laws? Can we...

What is the cause of the observed accelerated expansion (de Sitter phase) of the Universe?

What is the identity of dark matter? Is it a particle? Is it the lightest superpartner (LSP)? Do the phenomena attributed to dark matter point not to some form of matter but actually to an extension...

Why does the zero-point energy of the vacuum not cause a large cosmological constant? What cancels it out?

Why is there far more matter than antimatter in the observable universe?