"Mom! Don't go! Mom! Mom......"

Qin Hao stretched out his hands and danced in the air, the corners of his eyes were full of tears. Qin Hao rubbed his eyes and looked outside, the dark and cold ground, the black ceiling, the dark corridor, and a torch lit at intervals. Torches embedded in the walls stretched out along the long corridors into the distance.

Qin Hao slowly climbed up with his hand on the wall, the unknown black stone wall was seamless, flashing with cold light, exuding a cold air, and his fingers were cold and piercing.

The silent corridor echoed Qin Hao's footsteps emptyly, and a fork in the road soon appeared on the left side of the corridor, Qin Hao walked along the fork in the road, and after walking for a while, a fork in the road appeared again. Qin Hao glanced at the walls on the left and right, the walls with torches were exactly the same, and he couldn't see the slightest difference. Qin Hao walked along the left wall, the fork in the road appeared, continued to walk on the left, and the fork in the road appeared again and continued to walk on the left......

"Qin Hao, tell me about the difference between Einstein and Newton's theory of relativity about dimensions." In interstellar physics class, the female teacher with eyes turned over the light, walked to the desk, and asked the little boy sitting at the front of the classroom.

"Yes!" The thin little boy stood up and said aloud: "The most important difference between Einstein's general theory of relativity and Newton's theory of relativity in terms of dimensions is the difference between high and low dimensions.

Newton's special theory of relativity solves the gravitational attraction between two objects, which is dimensionally limited to two-dimensional or three-dimensional objects in the same space-time, and the space-time view of rest or motion is based on the determination of the length of time and derives other values, that is, there is no limit to speed.

Einstein's general theory of relativity is based on coordinates and the light signal emitted by the object is used as the transmission medium. Worldviews have different lengths and time benchmarks in different frames of reference, and the different benchmarks are linked together by light. ”

The little boy paused, "At the same time, the two systems of expression are different. Newton's theory of relativity is a Euclidean system, the Cartesian coordinate system and the coordinate system coordinate value are the same value is interchangeable, and the reference value is a fixed number. Geodesics are arcs, and the distance between two points is represented by a straight line.

Einstein's theory of relativity uses the Min geometric system, which describes the four-dimensional straight space-time, the benchmark value is a variable, the geodesic line can be a straight line, and two parallel lines must have an intersection point at infinity......"

"Time and space are equivalent parameters in four-dimensional space-time, the same event needs to be described by four coordinates, and the set of all events experienced by the particle in space-time forms a world line." Qin Hao read it out in a low voice as he walked.

"The high-dimensional is more concretely low-dimensional, and the high-dimensional model cannot be intuitively constructed, and the low-dimensional journey to the high-dimensional is actually a one-dimensional motion containing the two coordinates of time and space in space, a straight line in the high-dimensional space, and a curve in the low-dimensional space."

Qin Hao habitually touched Guangxun, and his pocket was empty.

Qin Hao stopped and exhaled. Calm your mind, grab your left hand with your right hand to test your pulse, and take a step. The heart rate measured at school is 61 beats per minute, 96 steps per minute, and the step length is 63 cm. At a fork in the road, take a step to the next fork, remove the value that is too different, keep the approximate value, and get the time and distance. Go to the next fork again, and then go to the next fork.

Qin Hao scratched his head when he saw the time and distance between the palms of his hands. Pushing the wall with both hands, the chill of the cold wall came in.

"What to do? Trapped inside. Don't be discouraged, try to the right again. Qin Hao lowered his head and calculated.

After a long time, Qin Hao looked at the disorganized numbers and shook his head.

"There must be a pattern, try it alternately left and right." Qin Hao cheered himself up.

I don't know how long it took, Qin Hao stopped. Groups of tiny numbers are neatly arranged in the wide palms of the hands. "It seems that it is really in a high-dimensional space, but I hope it is only a four-dimensional space." Qin Hao sighed, "I must go out!" ”

"Four-dimensional space needs four coordinates to define a time, time and space are of equal value, and all events experienced in time and space are a separate world line." Qin Hao muttered in a low voice what he had learned when he was in school.

"Time, space, coordinates, world line", Qin Hao hammered his chest with his right hand. "This space is only left and right, only length and width, no depth, no, no, this may be okay", Qin Hao ran, counting the forks in the space.

There is never an end in sight, there is always an infinite fork in the road, there is no time, and it is despairing.

In the space where the torch is lit, a teenager is running wildly, and the boy does not feel tired, does not feel hungry, does not feel sleepy.

"Maybe that's possible," the boy said, looking down at his hands and writing on his arms. "Give it a try." The sound of running sounded in the space again.

"I was caught by the green pattern, and if this is the four-dimensional space of the pattern. Each one should be a complete word, corresponding to the continuous division of the herringbone in the three-dimensional projection. Qin Hao touched his chin. If it is a higher dimension, such as the fifth dimension or the sixth dimension, I believe that it will be torn apart by the huge spatial pressure as soon as you enter this space. Then you have to figure out whether it is a word or a person. ”

Qin Hao had a flash of inspiration and patted his shoulder. Recording as he ran. At each fork in the road, pat the walls around the fork in the road with your hands, and measure the very small temperature difference between the floor and the wall with the palm of your hand. "It has been confirmed that the same is a complete space, and the four-dimensional space may be a word, so it is necessary to confirm whether it is a herringbone under the projection of a word, and whether each pattern is a broken or split herringbone." Qin Hao stopped and used his pen to record the three-dimensional image of each fork in the road.

"No, there must be something wrong," Qin Hao lowered his head and looked at the three-dimensional image of the fork in the road he walked over his shoulder. The three-dimensional image shows whether it is a broken glyph, it is a continuous glyph, and it may be more appropriate to call it a large character.

"Then run and see where this continuous one ends!" Qin Hao clenched his fists and ran shallowly.

"Well, the intersection in front has become thinner, and the lights are gone", Qin Hao touched the end of the road, the pointed wall.

Qin Hao retreated and ran to the fork in the road.

"What's going on" Qin Hao looked at the record and fell into deep thought, "I haven't gone through the same pattern again, it's definitely not a ghost hitting the wall." If the pattern is a big character, not a herringbone, then it is not a 4-dimensional space. If it is in a three-dimensional space, the pattern is infinitely circulating, according to the same length-width ratio and infinite stretch depth of the passage, as well as the weight of this black stone, if it is placed vertically up and down, it will inevitably break and collapse, violating gravity. ”

"Gravity!" Qin Hao shouted excitedly, Qin Hao pulled a meteorite button on the space suit, flipped the inside of a corner, and gently tore off a sticking thread. Hold out the pen and write down the starting point on your arm, button it in your left hand, raise it above your head with the sticker line in your right hand, and let it go at the same time, observing that one is the first to touch the ground. I ran forward for a long time, wrote down the location on my arm, repeated the observation of the button and the pasting line, which was the first to touch the ground, and ran forward to note the location, repeated the test, and then continued to run......

Qin Hao looked at the record with a smile on his face. Hundreds of sets of data show that the meteorite button and the paste line with a huge difference in weight did not land at the same time, and the data recorded later showed that the farther back, the larger the time interval between the button and the paste line.

This shows that the space here is not in three-dimensional space. If it's not a three-dimensional space and it's not a four-dimensional space, will it be 3.5 dimensions, 3.25 dimensions, 3.125 dimensions, 3.0625 dimensions.... "Qin Hao took a pen and wrote, his arms recording dense data.

"The tearing force of space is very small," Qin Hao squeezed his cheeks and jumped again, "If you don't jump very high, it means that you are still in the third dimension, or most of them are still in the third dimension." However, if it is an upper and lower structure, this channel is an infinite length of water pipe structure, and in the third space it will be subjected to a stronger gravitational force, and the pipe will collapse, and here it is very stable and hard, how to explain it. Qin Hao hugged his head tightly and closed his eyes.

"Students, what is the key to our completion of the interstellar crossing?" Gray-haired teachers walked around the classroom, smiling at the students.

"Click," said a girl with a double ponytail next to her, smiling slyly, throwing an eraser at the boy next to him who was holding a book and bowing his head.

"Qin Hao, give me a specific answer." The white-haired teacher glanced at the boy.

"Yes, Teacher." Qin Hao responded, glaring at the girl who was covering her mouth and snickering.

"Because of the solution of space wall technology, on the basis of Einstein's theory of relativity, people have found that different interstellar clouds have different densities and honeycomb-shaped holes between them. For a certain period of time, the penetration rate of light through these holes is inconsistent, and this spherical hive space structure is more stable than wormholes that do not know the interstellar destination."

"That's right, listen to the lecture in class, sit down," the white-haired teacher said, looking at the boy.

"Now cutting-edge theoretical research, there is a kind of funnel-shaped space wall in the universe, which interstellar physicists believe is the key to breaking through the interstellar plane." The white-haired teacher looked up, "Alright, look at the interstellar model on page three below."

"That's right! The interstellar funnel, the key to the plane", Qin Hao opened his eyes and grinned as he wrote.

"The funnel of the upper and lower structures, then there are two openings, the base space and the plane space. Next, I'm going to find the entrance to the space where Hanhai is located. Qin Hao wrote it down on his chest. What happened when I was caught by the green pattern, think about it, as much as I could. Caught by the green pattern, the high-speed machine was ejected urgently, Zhou Yi was facing backwards, I was facing forward, and I was wrapped up all of a sudden, and then fell unconscious....... There must be something I haven't remembered yet", Qin Hao thought down, holding his head with his hand from time to time. "The high-speed machine ejected, forward, wrapped, unconscious...... Wrapped, unconscious .... What happened when I was wrapped up and how did I get unconscious? Parcel..... Coma, coma. ”

Qin Hao clasped his hands and lowered his head. "Comatose, I remember that when I wrapped it up, my whole body tingled", Qin Hao touched his body, untied his protective clothing, and looked at his body, "There are no wounds, no pinprick marks, no redness and swelling, how could it sting at that time?" ”

"Don't be afraid, baby, don't be afraid, baby, dear. Take away the flowers, our baby is allergic to flowers. Qin Hao has seen it more than once, and his mother held the first light frequency recorded by his newborn self.