Cosmological “arrow of time” and baryon asymmetry of the universe

Barnaveli, Andro; Gogberashvili, Merab

doi:10.1016/0370-2693(93)90657-4

Physics Letters B

1993

DOI: 10.1016/0370-2693(93)90657-4

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Cosmological “arrow of time” and baryon asymmetry of the universe

Andro Barnaveli

Merab Gogberashvili

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Cited by 4 publications

(2 citation statements)

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“…This can be happening only after interaction with the matter with another direction of time (or energy) vector. As we mentioned above we only passively follow to time flow, direction of which coincides with cosmological arrow of time (possible source of different asymmetries in our world, see for example [24]). So it could work mechanism similar to that considered in papers [20] -after some time from the Big Bang all particles with another directions of time had been disappeared from our view.…”

mentioning

confidence: 99%

Brane-universe in six dimensions with two times

Gogberashvili

2000

Physics Letters B

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confidence: 99%

Brane-universe in six dimensions with two times

Gogberashvili

2000

Physics Letters B

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“…Since antimatter can be interpreted as an ordinary matter propagating backward in time, for nonstationary spacetime (like an expanding new phase bubble) the time and thus CP-violation could be accrued in a CPT preserving framework [45]. To explore gravitational CP-violations for static backgrounds as well, one can use the fact that some quantum mechanical effects depend upon the gravitational potential themselves, not only to its gradient.…”

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confidence: 99%

Electroweak Phase Transitions in Einstein’s Static Universe

Gogberashvili

2018

Advances in High Energy Physics

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We suggest using Einstein's static universe metric for the metastable state after reheating, instead of the Friedman-RobertsonWalker spacetime. In this case, strong static gravitational potential leads to the effective reduction of the Higgs vacuum expectation value, which is found to be compatible with the Standard Model first-order electroweak phase transition conditions. Gravity could also increase the CP-violating effects for particles that cross the new phase bubble walls and thus is able to lead to the successful electroweak baryogenesis scenario.According to standard cosmology at the electroweak scale, our universe is in radiation dominated phase where all Standard Model particles are massless [1]. Once the temperature drops below the critical value, ∼ 170 GeV, the electroweak phase transition has occurred and the Higgs boson, gauge bosons, and fermions (except neutrinos) acquire masses through the Higgs mechanism. The order of this phase transition depends on the details of the Higgs potential with the temperature dependent terms [2][3][4][5]. To have a first-order phase transition effective Higgs potential of the model should have several minima. Of special importance is the cubic term in effective potential, which is essential to generate a potential barrier between the symmetric and broken phases and thus can provide the phase transition to be of the first order. In the Standard Model the cubic term, 3 , is contributed only by the electroweak gauge bosons. If at zero temperature the Higgs field at the minimum of the potential has the value V ≈ 246 GeV,the parameter is the cubic term of the effective potential of order ofwhere and are the gauge bosons masses. Then the condition that the Higgs effective potential has two minima leads to the very small value for the Higgs self-coupling parameter,which according to (1) is incompatible with the observed Higgs boson mass,This means that within the minimal Standard Model the electroweak phase transition is a smooth crossover, or of the second order [4,5]. On the other hand, the first-order electroweak phase transitions may solve some cosmological problems, like the generation of the baryon asymmetry of the universe (see recent reviews [6,7]). A first-order cosmological phase transition proceeds through the formation and expansion of cosmic bubbles. In this scenario spacetime is separated into two manifolds with their own distinct metrics, which are typically joined across a thin wall (domain wall). The dynamics of such objects can be very complicated, depending on the matter content of the interior (true vacuum) and exterior (false vacuum) regions as well as the tension on the bubble walls and how they interact with the surrounding plasma [8]. In bubble models matter-antimatter asymmetry can be generated at the electroweak scale, because all three Sakharov conditions

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Reciprocal of the CPT theorem

Álvarez-Gaumé,

Chaichian,

Oksanen

et al. 2024

Physics Letters B

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Cosmological “arrow of time” and baryon asymmetry of the universe

Cited by 4 publications

References 6 publications

Brane-universe in six dimensions with two times

Brane-universe in six dimensions with two times

Electroweak Phase Transitions in Einstein’s Static Universe

Reciprocal of the CPT theorem

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