The standard mannikin of cosmology , the theory that explains the universe at large scales , is buckling under peculiar observations . Different measurement of the Hubble Constant , the expansion rate of the universe , producetwo different numberswhen they should just be find one . There ’s currently no go explanation for this " tension " but physicists are working on it . A new solution has put frontwards the estimation there are a sight more particles out there and they make up an invisible " mirror macrocosm " through our universe .
As reported in the journalPhysical Review Letters , the squad worked out a way to trifle with the model of the cosmos and reconcile observation by applying a uniform scaling of the gravitational gratuitous - fall rates and photon - negatron scattering rate . This fixes the discrepancy without messing with anything else in the universe , but with a caution .
“ Basically , we indicate out that a batch of the observations we do in cosmology have an inherent symmetry under rescaling the world as a whole . This might furnish a way to see why there looks like a variant between dissimilar measurements of the Universe ’s elaboration rate , ” lead author Francis - Yan Cyr - Racine , assistant prof in the Department of Physics and Astronomy at the University of New Mexico , tell in astatement .
The caveat is the being of mirror matter . The mirror matter mind in its mod form is a few decennary older . Symmetry for fundamental particles comes in multiple sort . There ’s clock time reversal , which guarantee that energy is conserved . There ’s charge balance that underpins the existence of antimatter . And then there ’s spacial symmetry , rotation , interlingual rendition , and reflection .
simple particles do n’t honor the mirror reflection isotropy also have intercourse as phosphorus - symmetry or parity . They do respect a combined CPT ( Charge , Parity , Time ) isotropy but the break in the para had some physicists consider if there was a mirror variant of all make out particles .
While no evidence presently hint that that is the case , this new work find that if this mirror matter exist , then you’re able to do the grading of those rates and correct the tension in the cosmological observation .
“ In practice , this scale symmetry could only be take in by include a mirror world in the model — a parallel macrocosm with new particles that are all copy of known particles , ” said Cyr - Racine . “ The mirror Earth idea first arise in the 1990s but has not antecedently been recognized as a potential solution to the Hubble perpetual problem .
“ This might seem unbalanced at look value , but such mirror worlds have a large physics lit in a whole different context since they can help solve important problem in atom cathartic , ” Cyr - Racine added . “ Our workplace allow us to connect , for the first time , this large literature to an authoritative problem in cosmogeny . ”
The example is not the perfect solution just yet , however . The team plan to continue to work out on it and look for a mode to encumber two other characteristic that presently ca n’t be quenched with the model : the teemingness of He and atomic number 1 isotope heavy hydrogen at the beginning of the world .
