The observed discordances in cosmology signaling new Physics

Zhang, Haichao

doi:10.21203/rs.3.rs-99476/v2

Cited by 1 publication

(2 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The spatial extension property of the wavepackets of ultralight particles guarantees that the cosmic space is filled with dark matter everywhere. Therefore, the possibility of appearing observable long-range scalar fifth force [54] is avoided since the matter-density-dependent interaction range of the scalar is extremely short [45,59]. For the current cosmic density ∼ 10 −27 kg/m 3 , the interaction range is estimated to be several µm.…”

Section: A the Trapped Quintessence Modelmentioning

confidence: 99%

See 1 more Smart Citation

Could trapped quintessence account for the laser-detuning-dependent acceleration of cold atoms in varying-frequency time-of-flight experiments?

Zhang

et al. 2022

Phys. Rev. D

Self Cite

View full text Add to dashboard Cite

Using a trapped quintessence model, a series of time-of-flight (TOF) experiments with a different frequency of probe light were designed and performed. The varying-frequency TOF (VFTOF) experiments demonstrated that the fall acceleration of test atoms is dependent on the detuning of the probe light frequency with respect to the atomic transition frequency. In appropriately designed experiments, if the scalar field in the model accounts for the accelerated expansion of the Universe entirely, the field will result in an observable fifth force. Meanwhile, the trapped quintessence model still satisfies all experimental bounds on deviations from general relativity due to both the saturation effect and the short interaction range of the scalar field. The scalar saturates at a value corresponding to the cosmological constant when the microscopic nonrelativistic matter density is large enough. The interaction range of the scalar is inversely proportional to the square root of the microscopic nonrelativistic matter density. The interaction range has been estimated to be several µm in the current cosmic density ∼ 10 −27 kg/m 3 . The Universe is assumed to be permeated with fuzzy dark matter, which means that the microscopic nonrelativistic matter density defined through the quantum wavefunctions of the ultralight particles can be used on the cosmic scale.In an almost completely empty space between atoms of a dilute atomic gas in an ultrahigh vacuum chamber, the interaction range of the scalar field may approach to the order of ∼ 1 µm in the presence of dark matter and then the scalar field might be detected in laboratories. Since the trapped quintessence model hypothesizes that the scalar strongly couples to nonrelativistic matter but cannot couple to radiation, the source for generating the fifth force was experimentally set up by the laser-irradiated background atoms in the ultrahigh vacuum chamber. The mass density of the source was altered by detuning the frequency of the probe laser light from the atomic resonance transition. The test atoms were prepared by the laser cooling technique and located initially above the probe light. When the test atoms were released from their initial positions, they were able to pass through the region of the source that generated the fifth force to be measured. Thus, if the scalar field existed, the corresponding fifth force might be sensed by the test atoms even if the interaction range was extremely short. By measuring the fall acceleration of the test atoms with the TOF method step-by-step in the detuning frequency domain of the probe light, we derived the dispersion curves of the measured acceleration versus the frequency detuning of the probe light. When the nonrelativistic matter density of the source increased due to the energy gained from the laser light, the test atoms were pulled to the center of the source, and vice versa. If the trapped quintessence model is correct, the observed detuning-dependent acceleration in the VFTOF scheme suggests a closed Universe, i.e., a positive...

show abstract

Section: A the Trapped Quintessence Modelmentioning

confidence: 99%

“…If the Universe is closed as show in [60], the parameters are determined as follows [59] M 2 = 4.40353 meV/c 2 = 7.850 × 10 −39 kg,…”

Section: A the Trapped Quintessence Modelmentioning

confidence: 99%