Yes, a local void with a lower density than average could explain the Hubble tension. The local void is about 70 megaparsecs from Earth and has a density contrast of negative 0.2. This means that it is 20% less dense than the average.
The Hubble tension is the disagreement in the values of H0 obtained by different teams. The local void could reduce the Hubble tension by about 70 percent.
According to Dr. Kroupa and his colleagues, our galaxy may reside in a space cavity with a lower matter density than the surrounding matter. The surrounding matter exerts gravitational forces that pull the galaxies inside the cavity toward the edges. This causes the galaxies to move away from us faster than expected.
Scientists believe that we could live in a giant void, a bubble of less-dense matter left over from the Big Bang. If so, it could explain the expansion rate of the universe.
This highlights one of the most appealing aspects of MOND: it does away with the Hubble Tension entirely. Rather than two constants, there would be only one for measuring the expansion of the Universe, and observed deviations are due to irregularities in the distribution of matter
The Hubble tension is a disagreement between two methods used to measure the rate of the universe’s expansion. The Hubble constant is the rate of the universe’s expansion. The Hubble tension is considered one of the most pressing problems in cosmology today
The Hubble tension is caused by the following discrepancies:
- Late universe measurements: These measurements use calibrated distance ladder techniques and converge on a value of approximately 73 (km/s)/Mpc.
- Early universe measurements: These measurements use the cosmic microwave background and agree on a value near 67.7 (km/s)/Mpc.
- H0 values: The average values of H0 vary from 67.4 to 76.8 km∙s−1∙Mpc−1.
One solution to the Hubble tension is to assume that there was a spike in the amount of dark energy early in the Universe’s history
The Hubble limit is the event horizon for objects that have an average expansion speed of c between them and an observer. This means that light emitted from objects outside the Hubble limit would never be seen by an observer on Earth.
The Hubble Space Telescope’s wavelength range limits how far back in time we can see. The telescope can see back to when the universe was about 400 million years old
According to a paper published in the Monthly Notices of the Royal Astronomical Society, living in a giant void could explain the expansion rate of the universe. A giant void is a region of space with a density below average.
The paper suggests that outflows of matter from the void could inflate local measurements. These outflows would occur when denser regions surrounding the void pull it apart.
The void would need to be about a billion light years in radius and with a density about 20% below the average for the universe. This is unexpected in the standard model of cosmology, which predicts that matter is more or less evenly distributed throughout the universe.
The expansion rate of the universe is also known as the Hubble constant. It tells us how fast the space between galaxies is stretching.
The Hubble constant is a unit of measurement that describes the expansion of the universe. It’s a constant of proportionality that relates the velocity and distance of galaxies. The Hubble constant is determined by drawing a best fit line across a graph that maps the recession velocity versus distance for many galaxies. The slope of the line is the Hubble constant
The Hubble constant is one of the most important numbers in cosmology. It can be used to determine the age of the universe and its history
Hubble’s law, also known as the Hubble–Lemaître law, states that galaxies move away from Earth at speeds that are proportional to their distance. This means that galaxies that are farther away move away from Earth faster than those that are closer.
Edwin Hubble discovered Hubble’s law in the 1920s and 1930s. He compared his distances to Slipher’s measurements of redshift, creating a plot that is now known as a Hubble diagram. The diagram showed that a galaxy’s redshift increased linearly with its distance from Earth.
Hubble’s law also tells us something about the state of the universe. If the universe is static and unchanging, there should be no correlation between distance and velocity.
Hubble used a few methods to measure distance:
- Trigonometric parallax Measures the apparent shift in an object’s position due to a change in the observer’s point of view. Hubble used this technique to measure the distance to a cluster of stars.
- Cepheid variable stars Hubble used the work of Henrietta Leavitt to predict the brightness of these stars, which allowed him to calculate their distances from Earth. He used this technique to measure the distances to galaxies.
- Parallax measurements Hubble used the Earth’s orbit as a baseline to measure the distances to closer Cepheid variables in our own galaxy.
- Apparent magnitude Hubble measured the apparent magnitude of the total light from 22 distant nebulae. He compared the average of these measurements to the mean absolute magnitude of the total light from 24 nebulae whose distances he already knew.
Hubble also used the Doppler shift to measure velocity. By taking the spectrum of a distant object, such as a galaxy, astronomers can see a shift in the lines of its spectrum and from this shift determine its velocity.(full article source google)
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