Supernova bound on new scalars from resonant (and

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Supernova bound on new scalars from resonant (and soft) emission Henry Stubbs University of Oxford 2410.17347, Edward Hardy, Anton Sokolov, HS BSM at low scales? Renormalizable portals Beyond the Standard Model... Dark matter Neutrino

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Supernova bound on new scalars from resonant (and soft) emission Henry Stubbs
University of Oxford 2410.17347, Edward Hardy, Anton Sokolov, HS

BSM at low scales?

Renormalizable 'portals' Beyond the Standard Model... Dark matter Neutrino masses Gravity Strong CP problem Cosmological constant Hierarchy problem

Higgs-portal scalars

Supernovae Photons absorbed Want to look at the neutrino signal! T = 30MeV New scalars contribute to cooling

Can be produced from bulk Neutrinos escape as core cools

Dominated by surface emission Not to scale

Raffelt bound New energy loss speeds up cooling
Shorter neutrino burst
Conflict with observations of SN 1987A Puts strong constraints on particles with masses 1-100 MeV

Ingredients Production rate
Many processes
Thermal effects

Decay and re-absorption rate
Leads to the "trapping regime"

Realistic* supernova conditions *This is somewhat controversial

Production mechanisms Bremsstrahlung Resonant conversion

The resonant condition

Plasma mixing Requires charge conjugation symmetry to be broken by the medium Generated by an electron loop → proportional to electron’s coupling to both scalar and photon Vanishes when contracted with transverse polarization tensors and satisfies the Ward identity. Lorentz invariant phase space for the fermion

Results

Future directions Other BSM signatures in supernovae?

Spin-2 particles?

Cosmology? Thank you

Model dependency

Progenitor profiles

Details of production rate

Supernova bound on new scalars from resonant (and

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