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gravity coupled with Lagrange multiplier and mimetic potential to yield viable inflationary cosmological solutions consistent with latest Planck and BICEP2/Keck Array data. We present here three viable inflationary solutions of the Hubble parameter (

H

) represented by

H (N) = {(A \exp β N + B α^{N})}^{γ}

,

H (N) = {(A α^{N} + B \log N)}^{γ}

, and

H (N) = {(A e^{β N} + B \log N)}^{γ}

, where

A

,

β

,

B

,

α

,

γ

are free parameters, and

N

represents the number of e-foldings. We carry out the analysis with the simplest minimal

f (R, T)

function of the form

f (R, T) = R + χ T

, where

χ

is the model parameter. We report that for the chosen

f (R, T)

gravity model, viable cosmologies are obtained compatible with observations by conveniently setting the Lagrange multiplier and the mimetic potential. 相似文献

9.

The influence of third order terms on basins of convergence in the Hénon–Heiles type system

《New Astronomy》2022

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10.

The Supernova Remnant of More than 4100 Years Ago Was Discovered—Emperor Yao’s Jingxing (PKS 1209-52)

《Chinese Astronomy and Astrophysics》2023,47(2):309-334

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11.

The properties of hybrid stars in a low symmetry energy model

《New Astronomy》2022

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12.

Gravitational wave background discovered by NANOGrav as evidence of a cyclic universe

《New Astronomy》2022

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13.

First photometric study of two eclipsing binary star systems: V523 And and V543 And

《New Astronomy》2022

Detailed photometric analysis of V523 And and V543 And from the Wide Angle Search for Planets survey is presented for the first time. It was found that while V523 And is a detached binary, V543 And is a semi-detached binary star system. The adopted masses and radii for the primary and secondary components are

M_{1} = 0.77 \pm 0.08

M

_{⊙}

,

R_{1} = 0.87 \pm 0.08

R

_{⊙}

and

M_{2} = 0.50 \pm 0.12

M

_{⊙}

,

R_{2} = 0.77 \pm 0.17

R

_{⊙}

for V523 And; and

M_{1} = 1.59 \pm 0.16

M

_{⊙}

,

R_{1} = 1.46 \pm 0.09

R

_{⊙}

and

M_{2} = 0.58 \pm 0.17

M

_{⊙}

,

R_{2} = 1.66 \pm 0.22

R

_{⊙}

for V543 And. Orbital period variations of the systems were analyzed using the O-C method. The O-C change of V523 And is discussed in terms of the magnetic activity cycle of one or both components and light travel time effect (LTTE) due to a third body in the system. Among these mechanisms, LTTE seems to be the most appropriate mechanism to explain the O-C variation of the system since the quadrupole moments of the primary and secondary components (

Δ Q

) were found to be in the order of

1 0^{49}

g cm

^{2}

. The O-C diagram of V543 And shows a downward parabolic trend, which suggests a secular period decrease with a rate of

0.080 \pm 0.012

s/year. The parabolic O-C variation of V543 And was interpreted in terms of the non-conservative mass transfer mechanism. According to this scenario, the range of possible values of the mass gain rate (