Far-IR Background Excess

The cosmic far-infrared background (CIB) peaks in flux density near 100–200 microns and represents the integrated thermal emission from dust heated by star formation across cosmic history. Measurements from Herschel, Planck, and COBE/DIRBE have established the total CIB intensity, but its decomposition into contributions from different redshifts and galaxy types reveals tensions with ΛCDM galaxy formation models: the number counts of faint submillimeter and far-IR sources are higher than predicted, particularly at flux densities just below the resolution limit of single-dish surveys, and the inferred cosmic star formation rate density at z > 2 implied by the CIB exceeds what optical/UV surveys detect even with dust correction. This suggests either that a significant fraction of star formation at high redshift is deeply dust-obscured and missed by rest-frame UV observations, or that the total energy budget locked in the CIB cannot be accounted for by the known galaxy population.

Successive Collision Theory resolves the far-IR background excess through the contribution of pre-existing dust and stellar populations from the colliding pockets. The two spacetime pockets that collided to produce our observable universe had been undergoing star formation and stellar evolution for prior epochs within eternal infinite spacetime. Their stellar populations had processed gas through multiple stellar generations, producing substantial dust reservoirs in the interstellar and circumgalactic medium of pre-existing galaxies. When the collision thermalized these populations, much of this dust was not destroyed but incorporated into the post-collision debris field, contributing to the far-IR background from the earliest post-collision epochs. The result is an effective dust opacity and far-IR emissivity at high redshift that exceeds what first-generation post-collision star formation alone can produce, explaining the higher-than-expected CIB intensity and source counts.

The metallicity floor implied by pre-existing stellar populations in SCT — the minimum heavy element abundance present in the debris field from the collision epoch — ensures that dust formation begins immediately in post-collision gas rather than waiting for several generations of stellar nucleosynthesis as ΛCDM requires. This accelerated dust production timeline boosts the far-IR emissivity at z > 3 relative to ΛCDM predictions, shifting the peak contribution to the CIB to higher redshifts and increasing the total background intensity. SCT predicts that the far-IR source counts at the faintest flux densities will continue to exceed ΛCDM predictions even with improved confusion-limited imaging, because the excess sources are physically real high-redshift dusty galaxies forming from pre-enriched debris rather than a background of misidentified low-redshift interlopers.