SO(1,4) isometries yield explicit transformation laws and Ward identities for de Sitter amplitudes that reduce to Poincaré invariance at high momenta.
Vacuum States in de Sitter Space,
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Small-scale power spectrum boosts alter ionization morphology enough that 21 cm power spectra and bubble sizes remain distinguishable from Lambda CDM under current constraints, offering SKA a probe for such deviations.
In Starobinsky inflation, α-vacua produce small corrections to the scalar spectral index and its runnings that are tightly constrained by Planck data and sub-millimeter gravity bounds.
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Symmetries of de Sitter Particles and Amplitudes
SO(1,4) isometries yield explicit transformation laws and Ward identities for de Sitter amplitudes that reduce to Poincaré invariance at high momenta.
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Probing power spectrum enhancement at small scales with the SKA
Small-scale power spectrum boosts alter ionization morphology enough that 21 cm power spectra and bubble sizes remain distinguishable from Lambda CDM under current constraints, offering SKA a probe for such deviations.
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Choice of Quantum Vacuum for Inflation Observables
In Starobinsky inflation, α-vacua produce small corrections to the scalar spectral index and its runnings that are tightly constrained by Planck data and sub-millimeter gravity bounds.